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// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {ERC20Upgradeable, IERC20Upgradeable, IERC20MetadataUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";
import {ERC4626Upgradeable, SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/ERC4626Upgradeable.sol";
import {MathUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/math/MathUpgradeable.sol";
import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";

import "../interfaces/IGToken.sol";
import "../interfaces/IERC20.sol";
import "../interfaces/IGTokenLockedDepositNft.sol";
import "../interfaces/IGTokenOpenPnlFeed.sol";

import "../libraries/ChainUtils.sol";
import "../libraries/CollateralUtils.sol";
import "../libraries/TokenTransferUtils.sol";

/**
 * @dev GToken vault contract, direct counterparty to trades happening on gTrade
 */
contract GToken is ERC20Upgradeable, ERC4626Upgradeable, OwnableUpgradeable, IGToken {
    using MathUpgradeable for uint256;
    using TokenTransferUtils for address;

    // Contracts & Addresses (constant)
    address public gnsToken;
    IGTokenLockedDepositNft public lockedDepositNft;

    // Contracts & Addresses (adjustable)
    address public manager; // 3-day timelock contract
    address public admin; // bypasses timelock, access to emergency functions

    address public pnlHandler;
    IGTokenOpenPnlFeed public openTradesPnlFeed;
    GnsPriceProvider public gnsPriceProvider;

    // Parameters (constant)
    uint256 constant PRECISION_18 = 1e18;
    uint256 constant PRECISION_10 = 1e10; // 10 decimals (gns/asset oracle)
    uint256 constant MIN_DAILY_ACC_PNL_DELTA = PRECISION_18 / 10; // 0.1, price delta (1e18)
    uint256 constant MAX_SUPPLY_INCREASE_DAILY_P = 50 * PRECISION_18; // 50% / day, when under collat (1e18)
    uint256 constant MAX_LOSSES_BURN_P = 25 * PRECISION_18; // 25% of all losses (1e18)
    uint256 constant MAX_GNS_SUPPLY_MINT_DAILY_P = PRECISION_18 / 20; // 0.05% / day => 18.25% / yr max (1e18)
    uint256 constant MAX_DISCOUNT_P = 10 * PRECISION_18; // 10% (1e18)
    uint256 public MIN_LOCK_DURATION; // min locked asset deposit duration
    uint256 constant MAX_LOCK_DURATION = 365 days; // max locked asset deposit duration
    uint256 constant MAX_NATIVE_TRANSFER_GAS_LIMIT = 40_000; // the amount of gas to forward on native token transfers

    uint256[] WITHDRAW_EPOCHS_LOCKS; // epochs withdraw locks at over collat thresholds

    // Parameters (adjustable)
    uint256 public maxAccOpenPnlDelta; // PRECISION_18 (max price delta on new epochs from open pnl)
    uint256 public maxDailyAccPnlDelta; // PRECISION_18 (max daily price delta from closed pnl)
    uint256[2] public withdrawLockThresholdsP; // PRECISION_18 (% of over collat, used with WITHDRAW_EPOCHS_LOCKS)
    uint256 public maxSupplyIncreaseDailyP; // PRECISION_18 (% per day, when under collat)
    uint256 public lossesBurnP; // PRECISION_18 (% of all losses)
    uint256 public maxGnsSupplyMintDailyP; // PRECISION_18 (% of gns supply)
    uint256 public maxDiscountP; // PRECISION_18 (%, maximum discount for locked deposits)
    uint256 public maxDiscountThresholdP; // PRECISION_18 (maximum collat %, for locked deposits)

    // Price state
    uint256 public shareToAssetsPrice; // PRECISION_18
    int256 public accPnlPerTokenUsed; // PRECISION_18 (snapshot of accPnlPerToken)
    int256 public accPnlPerToken; // PRECISION_18 (updated in real-time)
    uint256 public accRewardsPerToken; // PRECISION_18

    // Closed Pnl state
    int256 public dailyAccPnlDelta; // PRECISION_18
    uint256 public lastDailyAccPnlDeltaReset; // timestamp

    // Epochs state (withdrawals)
    uint256 public currentEpoch; // global id
    uint256 public currentEpochStart; // timestamp
    uint256 public currentEpochPositiveOpenPnl; // 1e18

    // Deposit / Withdraw state
    uint256 public currentMaxSupply; // collateralConfig.precision
    uint256 public lastMaxSupplyUpdate; // timestamp
    mapping(address => mapping(uint256 => uint256)) public withdrawRequests; // owner => unlock epoch => shares

    // Locked deposits state
    uint256 public lockedDepositsCount; // global id
    mapping(uint256 => LockedDeposit) public lockedDeposits;

    // Deplete / Refill state
    uint256 public assetsToDeplete; // collateralConfig.precision
    uint256 public dailyMintedGns; // 1e18
    uint256 public lastDailyMintedGnsReset; // timestamp

    // Statistics (not used for contract logic)
    uint256 public totalDeposited; // collateralConfig.precision (assets)
    int256 public totalClosedPnl; // collateralConfig.precision (assets)
    uint256 public totalRewards; // collateralConfig.precision (assets)
    int256 public totalLiability; // collateralConfig.precision (assets)
    uint256 public totalLockedDiscounts; // collateralConfig.precision (assets)
    uint256 public totalDiscounts; // collateralConfig.precision (assets)
    uint256 public totalDepleted; // collateralConfig.precision (assets)
    uint256 public totalDepletedGns; // 1e18 (gns)
    uint256 public totalRefilled; // collateralConfig.precision (assets)
    uint256 public totalRefilledGns; // 1e18 (gns)

    /// @custom:deprecated acc values
    uint256 public accBlockWeightedMarketCap;
    uint256 public accBlockWeightedMarketCapLastStored;

    // Multi-Collat support
    CollateralUtils.CollateralConfig public collateralConfig;

    // Allows the contract to receive ether
    receive() external payable {}

    // Initializer function called when this contract is deployed
    function initialize(
        Meta memory _meta,
        ContractAddresses memory _contractAddresses,
        uint256 _MIN_LOCK_DURATION,
        uint256 _maxAccOpenPnlDelta,
        uint256 _maxDailyAccPnlDelta,
        uint256[2] memory _withdrawLockThresholdsP,
        uint256 _maxSupplyIncreaseDailyP,
        uint256 _lossesBurnP,
        uint256 _maxGnsSupplyMintDailyP,
        uint256 _maxDiscountP,
        uint256 _maxDiscountThresholdP
    ) external initializer {
        if (
            !(_contractAddresses.asset != address(0) &&
                _contractAddresses.owner != address(0) &&
                _contractAddresses.manager != address(0) &&
                _contractAddresses.admin != address(0) &&
                _contractAddresses.owner != _contractAddresses.manager &&
                _contractAddresses.manager != _contractAddresses.admin &&
                _contractAddresses.gnsToken != address(0) &&
                _contractAddresses.lockedDepositNft != address(0) &&
                _contractAddresses.pnlHandler != address(0) &&
                _contractAddresses.openTradesPnlFeed != address(0) &&
                _contractAddresses.gnsPriceProvider.addr != address(0) &&
                _contractAddresses.gnsPriceProvider.signature.length > 0 &&
                _maxDailyAccPnlDelta >= MIN_DAILY_ACC_PNL_DELTA &&
                _withdrawLockThresholdsP[1] > _withdrawLockThresholdsP[0] &&
                _maxSupplyIncreaseDailyP <= MAX_SUPPLY_INCREASE_DAILY_P &&
                _lossesBurnP <= MAX_LOSSES_BURN_P &&
                _maxGnsSupplyMintDailyP <= MAX_GNS_SUPPLY_MINT_DAILY_P &&
                _maxDiscountP <= MAX_DISCOUNT_P &&
                _maxDiscountThresholdP >= 100 * PRECISION_18)
        ) {
            revert WrongValues();
        }

        __ERC20_init(_meta.name, _meta.symbol);
        __ERC4626_init(IERC20MetadataUpgradeable(_contractAddresses.asset));
        _transferOwnership(_contractAddresses.owner);

        gnsToken = _contractAddresses.gnsToken;
        lockedDepositNft = IGTokenLockedDepositNft(_contractAddresses.lockedDepositNft);
        manager = _contractAddresses.manager;
        admin = _contractAddresses.admin;
        pnlHandler = _contractAddresses.pnlHandler;
        openTradesPnlFeed = IGTokenOpenPnlFeed(_contractAddresses.openTradesPnlFeed);
        gnsPriceProvider = _contractAddresses.gnsPriceProvider;

        MIN_LOCK_DURATION = _MIN_LOCK_DURATION;

        maxAccOpenPnlDelta = _maxAccOpenPnlDelta;
        maxDailyAccPnlDelta = _maxDailyAccPnlDelta;
        withdrawLockThresholdsP = _withdrawLockThresholdsP;
        maxSupplyIncreaseDailyP = _maxSupplyIncreaseDailyP;
        lossesBurnP = _lossesBurnP;
        maxGnsSupplyMintDailyP = _maxGnsSupplyMintDailyP;
        maxDiscountP = _maxDiscountP;
        maxDiscountThresholdP = _maxDiscountThresholdP;

        shareToAssetsPrice = PRECISION_18;
        currentEpoch = 1;
        currentEpochStart = block.timestamp;
        WITHDRAW_EPOCHS_LOCKS = [3, 2, 1];
    }

    function initializeV3() external reinitializer(3) {
        collateralConfig = CollateralUtils.getCollateralConfig(asset());
    }

    // Modifiers
    modifier onlyManager() {
        _onlyManager();
        _;
    }

    modifier checks(uint256 assetsOrShares) {
        _checks(assetsOrShares);
        _;
    }

    modifier validDiscount(uint256 lockDuration) {
        _validDiscount(lockDuration);
        _;
    }

    // Modifier helpers - saves bytecode size
    function _onlyManager() private view {
        if (_msgSender() != manager) revert OnlyManager();
    }

    function _checks(uint256 assetsOrShares) private view {
        if (shareToAssetsPrice == 0) revert PriceZero();
        if (assetsOrShares == 0) revert ValueZero();
    }

    function _validDiscount(uint256 lockDuration) private view {
        if (maxDiscountP == 0) revert NoActiveDiscount();
        if (lockDuration < MIN_LOCK_DURATION) revert BelowMin();
        if (lockDuration > MAX_LOCK_DURATION) revert AboveMax();
    }

    // Manage addresses
    function transferOwnership(address newOwner) public override onlyOwner {
        if (newOwner == address(0)) revert OwnableInvalidOwner(address(0));
        if (newOwner == manager || newOwner == admin) revert WrongValue();
        _transferOwnership(newOwner);
    }

    function updateManager(address newValue) external onlyOwner {
        if (newValue == address(0)) revert AddressZero();
        if (newValue == owner() || newValue == admin) revert WrongValue();
        manager = newValue;
        emit ManagerUpdated(newValue);
    }

    function updateAdmin(address newValue) external onlyManager {
        if (newValue == address(0)) revert AddressZero();
        if (newValue == owner() || newValue == manager) revert WrongValue();
        admin = newValue;
        emit AdminUpdated(newValue);
    }

    function updatePnlHandler(address newValue) external onlyOwner {
        if (newValue == address(0)) revert AddressZero();
        pnlHandler = newValue;
        emit PnlHandlerUpdated(newValue);
    }

    function updateGnsPriceProvider(GnsPriceProvider memory newValue) external onlyManager {
        if (newValue.addr == address(0)) revert AddressZero();
        if (newValue.signature.length == 0) revert BytesZero();
        gnsPriceProvider = newValue;
        emit GnsPriceProviderUpdated(newValue);
    }

    function updateOpenTradesPnlFeed(address newValue) external onlyOwner {
        if (newValue == address(0)) revert AddressZero();
        openTradesPnlFeed = IGTokenOpenPnlFeed(newValue);
        emit OpenTradesPnlFeedUpdated(newValue);
    }

    // Manage parameters
    function updateMaxAccOpenPnlDelta(uint256 newValue) external onlyOwner {
        maxAccOpenPnlDelta = newValue;
        emit MaxAccOpenPnlDeltaUpdated(newValue);
    }

    function updateMaxDailyAccPnlDelta(uint256 newValue) external onlyManager {
        if (newValue < MIN_DAILY_ACC_PNL_DELTA) revert BelowMin();
        maxDailyAccPnlDelta = newValue;
        emit MaxDailyAccPnlDeltaUpdated(newValue);
    }

    function updateWithdrawLockThresholdsP(uint256[2] memory newValue) external onlyOwner {
        if (newValue[1] <= newValue[0]) revert WrongValues();
        withdrawLockThresholdsP = newValue;
        emit WithdrawLockThresholdsPUpdated(newValue);
    }

    function updateMaxSupplyIncreaseDailyP(uint256 newValue) external onlyManager {
        if (newValue > MAX_SUPPLY_INCREASE_DAILY_P) revert AboveMax();
        maxSupplyIncreaseDailyP = newValue;
        emit MaxSupplyIncreaseDailyPUpdated(newValue);
    }

    function updateLossesBurnP(uint256 newValue) external onlyManager {
        if (newValue > MAX_LOSSES_BURN_P) revert AboveMax();
        lossesBurnP = newValue;
        emit LossesBurnPUpdated(newValue);
    }

    function updateMaxGnsSupplyMintDailyP(uint256 newValue) external onlyManager {
        if (newValue > MAX_GNS_SUPPLY_MINT_DAILY_P) revert AboveMax();
        maxGnsSupplyMintDailyP = newValue;
        emit MaxGnsSupplyMintDailyPUpdated(newValue);
    }

    function updateMaxDiscountP(uint256 newValue) external onlyManager {
        if (newValue > MAX_DISCOUNT_P) revert AboveMax();
        maxDiscountP = newValue;
        emit MaxDiscountPUpdated(newValue);
    }

    function updateMaxDiscountThresholdP(uint256 newValue) external onlyManager {
        if (newValue < 100 * PRECISION_18) revert BelowMin();
        maxDiscountThresholdP = newValue;
        emit MaxDiscountThresholdPUpdated(newValue);
    }

    // View helper functions
    function maxAccPnlPerToken() public view returns (uint256) {
        // PRECISION_18
        return PRECISION_18 + accRewardsPerToken;
    }

    function collateralizationP() public view returns (uint256) {
        // PRECISION_18 (%)
        uint256 _maxAccPnlPerToken = maxAccPnlPerToken();
        return
            ((
                accPnlPerTokenUsed > 0
                    ? (_maxAccPnlPerToken - uint256(accPnlPerTokenUsed))
                    : (_maxAccPnlPerToken + uint256(accPnlPerTokenUsed * (-1)))
            ) *
                100 *
                PRECISION_18) / _maxAccPnlPerToken;
    }

    function gnsTokenToAssetsPrice() public view returns (uint256 price) {
        // PRECISION_10
        (bool success, bytes memory result) = gnsPriceProvider.addr.staticcall(
            abi.encodeWithSelector(bytes4(gnsPriceProvider.signature), asset())
        );

        if (!success) revert GnsPriceCallFailed();

        (price) = abi.decode(result, (uint256));

        if (price == 0) revert GnsTokenPriceZero();
    }

    function withdrawEpochsTimelock() public view returns (uint256) {
        uint256 collatP = collateralizationP();
        uint256 overCollatP = (collatP - MathUpgradeable.min(collatP, 100 * PRECISION_18));

        return
            overCollatP > withdrawLockThresholdsP[1]
                ? WITHDRAW_EPOCHS_LOCKS[2]
                : (overCollatP > withdrawLockThresholdsP[0] ? WITHDRAW_EPOCHS_LOCKS[1] : WITHDRAW_EPOCHS_LOCKS[0]);
    }

    function lockDiscountP(uint256 collatP, uint256 lockDuration) public view returns (uint256) {
        return
            ((
                collatP <= 100 * PRECISION_18
                    ? maxDiscountP
                    : (
                        collatP <= maxDiscountThresholdP
                            ? (maxDiscountP * (maxDiscountThresholdP - collatP)) /
                                (maxDiscountThresholdP - 100 * PRECISION_18)
                            : 0
                    )
            ) * lockDuration) / MAX_LOCK_DURATION;
    }

    function totalSharesBeingWithdrawn(address owner) public view returns (uint256 shares) {
        for (uint256 i = currentEpoch; i <= currentEpoch + WITHDRAW_EPOCHS_LOCKS[0]; ++i) {
            shares += withdrawRequests[owner][i];
        }
    }

    // Public helper functions
    function tryUpdateCurrentMaxSupply() public {
        if (block.timestamp - lastMaxSupplyUpdate >= 24 hours) {
            currentMaxSupply = (totalSupply() * (PRECISION_18 * 100 + maxSupplyIncreaseDailyP)) / (PRECISION_18 * 100);
            lastMaxSupplyUpdate = block.timestamp;

            emit CurrentMaxSupplyUpdated(currentMaxSupply);
        }
    }

    function tryResetDailyAccPnlDelta() public {
        if (block.timestamp - lastDailyAccPnlDeltaReset >= 24 hours) {
            dailyAccPnlDelta = 0;
            lastDailyAccPnlDeltaReset = block.timestamp;

            emit DailyAccPnlDeltaReset();
        }
    }

    function tryNewOpenPnlRequestOrEpoch() public {
        // Fault tolerance so that activity can continue anyway
        (bool success, ) = address(openTradesPnlFeed).call(abi.encodeWithSignature("newOpenPnlRequestOrEpoch()"));
        if (!success) {
            emit OpenTradesPnlFeedCallFailed();
        }
    }

    // Private helper functions
    function updateShareToAssetsPrice() private {
        shareToAssetsPrice = maxAccPnlPerToken() - (accPnlPerTokenUsed > 0 ? uint256(accPnlPerTokenUsed) : uint256(0)); // PRECISION_18
        emit ShareToAssetsPriceUpdated(shareToAssetsPrice);
    }

    function _assetIERC20() private view returns (IERC20Upgradeable) {
        return IERC20Upgradeable(asset());
    }

    // Override ERC-20 functions (prevent sending to address that is withdrawing)
    function transfer(address to, uint256 amount) public override(ERC20Upgradeable, IERC20Upgradeable) returns (bool) {
        address sender = _msgSender();
        if (totalSharesBeingWithdrawn(sender) > balanceOf(sender) - amount) revert PendingWithdrawal();

        _transfer(sender, to, amount);
        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public override(ERC20Upgradeable, IERC20Upgradeable) returns (bool) {
        if (totalSharesBeingWithdrawn(from) > balanceOf(from) - amount) revert PendingWithdrawal();

        _spendAllowance(from, _msgSender(), amount);
        _transfer(from, to, amount);
        return true;
    }

    // Override ERC-4626 view functions
    function decimals() public view override(ERC20Upgradeable, ERC4626Upgradeable) returns (uint8) {
        return ERC4626Upgradeable.decimals();
    }

    function _convertToShares(
        uint256 assets,
        MathUpgradeable.Rounding rounding
    ) internal view override returns (uint256 shares) {
        return assets.mulDiv(PRECISION_18, shareToAssetsPrice, rounding);
    }

    function _convertToAssets(
        uint256 shares,
        MathUpgradeable.Rounding rounding
    ) internal view override returns (uint256 assets) {
        // Prevent overflow when called from maxDeposit with maxMint = uint256.max
        if (shares == type(uint256).max && shareToAssetsPrice >= PRECISION_18) {
            return shares;
        }
        return shares.mulDiv(shareToAssetsPrice, PRECISION_18, rounding);
    }

    function maxMint(address) public view override returns (uint256) {
        return
            accPnlPerTokenUsed > 0
                ? currentMaxSupply - MathUpgradeable.min(currentMaxSupply, totalSupply())
                : type(uint256).max;
    }

    function maxDeposit(address owner) public view override returns (uint256) {
        return _convertToAssets(maxMint(owner), MathUpgradeable.Rounding.Down);
    }

    function maxRedeem(address owner) public view override returns (uint256) {
        return
            openTradesPnlFeed.nextEpochValuesRequestCount() == 0
                ? MathUpgradeable.min(withdrawRequests[owner][currentEpoch], totalSupply() - 1)
                : 0;
    }

    function maxWithdraw(address owner) public view override returns (uint256) {
        return _convertToAssets(maxRedeem(owner), MathUpgradeable.Rounding.Down);
    }

    // Override ERC-4626 interactions (call scaleVariables on every deposit / withdrawal)
    function deposit(uint256 assets, address receiver) public override checks(assets) returns (uint256) {
        if (assets > maxDeposit(receiver)) revert ERC4626ExceededMaxDeposit();

        uint256 shares = previewDeposit(assets);
        scaleVariables(shares, assets, true);

        _deposit(_msgSender(), receiver, assets, shares);
        return shares;
    }

    function mint(uint256 shares, address receiver) public override checks(shares) returns (uint256) {
        if (shares > maxMint(receiver)) revert ERC4626ExceededMaxMint();

        uint256 assets = previewMint(shares);
        scaleVariables(shares, assets, true);

        _deposit(_msgSender(), receiver, assets, shares);
        return assets;
    }

    // Override ERC-4626 internal withdraw (unwraps native tokens)
    function _withdraw(
        address caller,
        address receiver,
        address owner,
        uint256 assets,
        uint256 shares
    ) internal override {
        if (caller != owner) {
            _spendAllowance(owner, caller, shares);
        }

        // If _asset is ERC777, `transfer` can trigger a reentrancy AFTER the transfer happens through the
        // `tokensReceived` hook. On the other hand, the `tokensToSend` hook, that is triggered before the transfer,
        // calls the vault, which is assumed not malicious.
        //
        // Conclusion: we need to do the transfer after the burn so that any reentrancy would happen after the
        // shares are burned and after the assets are transferred, which is a valid state.
        _burn(owner, shares);

        _transferAssets(receiver, assets);

        emit Withdraw(caller, receiver, owner, assets, shares);
    }

    // Handles transferring of assets including unwrapping when asset is a native token
    function _transferAssets(address receiver, uint256 assets) internal {
        address asset = asset();

        // If asset is a wrapped native token, unwrap and send
        if (ChainUtils.isWrappedNativeToken(asset)) {
            asset.unwrapAndTransferNative(receiver, assets, MAX_NATIVE_TRANSFER_GAS_LIMIT);
        } else {
            asset.transfer(receiver, assets);
        }
    }

    function withdraw(
        uint256 assets,
        address receiver,
        address owner
    ) public override checks(assets) returns (uint256) {
        if (assets > maxWithdraw(owner)) revert ERC4626ExceededMaxWithdraw();

        uint256 shares = previewWithdraw(assets);
        withdrawRequests[owner][currentEpoch] -= shares;

        scaleVariables(shares, assets, false);

        _withdraw(_msgSender(), receiver, owner, assets, shares);
        return shares;
    }

    function redeem(uint256 shares, address receiver, address owner) public override checks(shares) returns (uint256) {
        if (shares > maxRedeem(owner)) revert ERC4626ExceededMaxRedeem();

        withdrawRequests[owner][currentEpoch] -= shares;

        uint256 assets = previewRedeem(shares);
        scaleVariables(shares, assets, false);

        _withdraw(_msgSender(), receiver, owner, assets, shares);
        return assets;
    }

    function scaleVariables(uint256 shares, uint256 assets, bool isDeposit) private {
        uint256 supply = totalSupply();

        if (accPnlPerToken < 0) {
            accPnlPerToken =
                (accPnlPerToken * int256(supply)) /
                (isDeposit ? int256(supply + shares) : int256(supply - shares));
        } else if (accPnlPerToken > 0) {
            totalLiability +=
                ((int256(shares) * totalLiability) / int256(supply)) *
                (isDeposit ? int256(1) : int256(-1));
        }

        totalDeposited = isDeposit ? totalDeposited + assets : totalDeposited - assets;
    }

    // Withdraw requests (need to be done before calling 'withdraw' / 'redeem')
    function makeWithdrawRequest(uint256 shares, address owner) external {
        if (openTradesPnlFeed.nextEpochValuesRequestCount() > 0) revert EndOfEpoch();

        address sender = _msgSender();
        uint256 allowance = allowance(owner, sender);

        if (sender != owner && (allowance == 0 || allowance < shares)) revert NotAllowed();

        if (totalSharesBeingWithdrawn(owner) + shares > balanceOf(owner)) revert AboveMax();

        uint256 unlockEpoch = currentEpoch + withdrawEpochsTimelock();
        withdrawRequests[owner][unlockEpoch] += shares;

        emit WithdrawRequested(sender, owner, shares, currentEpoch, unlockEpoch);
    }

    function cancelWithdrawRequest(uint256 shares, address owner, uint256 unlockEpoch) external {
        if (shares > withdrawRequests[owner][unlockEpoch]) revert AboveMax();

        address sender = _msgSender();
        uint256 allowance = allowance(owner, sender);

        if (sender != owner && (allowance == 0 || allowance < shares)) revert NotAllowed();

        withdrawRequests[owner][unlockEpoch] -= shares;

        emit WithdrawCanceled(sender, owner, shares, currentEpoch, unlockEpoch);
    }

    // Locked and discounted deposits
    function depositWithDiscountAndLock(
        uint256 assets,
        uint256 lockDuration,
        address receiver
    ) external checks(assets) validDiscount(lockDuration) returns (uint256) {
        uint256 simulatedAssets = (assets * (PRECISION_18 * 100 + lockDiscountP(collateralizationP(), lockDuration))) /
            (PRECISION_18 * 100);

        if (simulatedAssets > maxDeposit(receiver)) revert AboveMax();

        return
            _executeDiscountAndLock(simulatedAssets, assets, previewDeposit(simulatedAssets), lockDuration, receiver);
    }

    function mintWithDiscountAndLock(
        uint256 shares,
        uint256 lockDuration,
        address receiver
    ) external checks(shares) validDiscount(lockDuration) returns (uint256) {
        if (shares > maxMint(receiver)) revert AboveMax();
        uint256 assets = previewMint(shares);

        return
            _executeDiscountAndLock(
                assets,
                (assets * (PRECISION_18 * 100)) /
                    (PRECISION_18 * 100 + lockDiscountP(collateralizationP(), lockDuration)),
                shares,
                lockDuration,
                receiver
            );
    }

    function _executeDiscountAndLock(
        uint256 assets,
        uint256 assetsDeposited,
        uint256 shares,
        uint256 lockDuration,
        address receiver
    ) private returns (uint256) {
        if (assets <= assetsDeposited) revert NoDiscount();

        uint256 depositId = ++lockedDepositsCount;
        uint256 assetsDiscount = assets - assetsDeposited;

        LockedDeposit storage d = lockedDeposits[depositId];
        d.owner = receiver;
        d.shares = shares;
        d.assetsDeposited = assetsDeposited;
        d.assetsDiscount = assetsDiscount;
        d.atTimestamp = block.timestamp;
        d.lockDuration = lockDuration;

        scaleVariables(shares, assetsDeposited, true);
        address sender = _msgSender();
        _deposit(sender, address(this), assetsDeposited, shares);

        totalDiscounts += assetsDiscount;
        totalLockedDiscounts += assetsDiscount;

        lockedDepositNft.mint(receiver, depositId);

        emit DepositLocked(sender, d.owner, depositId, d);
        return depositId;
    }

    function unlockDeposit(uint256 depositId, address receiver) external {
        LockedDeposit storage d = lockedDeposits[depositId];

        address sender = _msgSender();
        address owner = lockedDepositNft.ownerOf(depositId);

        if (
            owner != sender &&
            lockedDepositNft.getApproved(depositId) != sender &&
            !lockedDepositNft.isApprovedForAll(owner, sender)
        ) revert NotAllowed();

        if (block.timestamp < d.atTimestamp + d.lockDuration) revert NotUnlocked();

        int256 accPnlDelta = int256(
            d.assetsDiscount.mulDiv(
                collateralConfig.precisionDelta * collateralConfig.precision,
                totalSupply(),
                MathUpgradeable.Rounding.Up
            )
        );

        accPnlPerToken += accPnlDelta;

        if (accPnlPerToken > int256(maxAccPnlPerToken())) revert NotEnoughAssets();

        lockedDepositNft.burn(depositId);

        accPnlPerTokenUsed += accPnlDelta;
        updateShareToAssetsPrice();

        totalLiability += int256(d.assetsDiscount);
        totalLockedDiscounts -= d.assetsDiscount;

        _transfer(address(this), receiver, d.shares);

        emit DepositUnlocked(sender, receiver, owner, depositId, d);
    }

    // Distributes a reward evenly to all stakers of the vault
    function distributeReward(uint256 assets) external {
        address sender = _msgSender();
        SafeERC20Upgradeable.safeTransferFrom(_assetIERC20(), sender, address(this), assets);

        accRewardsPerToken += (assets * collateralConfig.precisionDelta * collateralConfig.precision) / totalSupply();
        updateShareToAssetsPrice();

        totalRewards += assets;
        totalDeposited += assets;

        emit RewardDistributed(sender, assets);
    }

    // PnL interactions (happens often, so also used to trigger other actions)
    function sendAssets(uint256 assets, address receiver) external {
        address sender = _msgSender();
        if (sender != pnlHandler) revert OnlyTradingPnlHandler();

        int256 accPnlDelta = int256(
            assets.mulDiv(
                collateralConfig.precisionDelta * collateralConfig.precision,
                totalSupply(),
                MathUpgradeable.Rounding.Up
            )
        );

        accPnlPerToken += accPnlDelta;
        if (accPnlPerToken > int256(maxAccPnlPerToken())) revert NotEnoughAssets();

        tryResetDailyAccPnlDelta();
        dailyAccPnlDelta += accPnlDelta;
        if (dailyAccPnlDelta > int256(maxDailyAccPnlDelta)) revert MaxDailyPnl();

        totalLiability += int256(assets);
        totalClosedPnl += int256(assets);

        tryNewOpenPnlRequestOrEpoch();
        tryUpdateCurrentMaxSupply();

        SafeERC20Upgradeable.safeTransfer(_assetIERC20(), receiver, assets);

        emit AssetsSent(sender, receiver, assets);
    }

    function receiveAssets(uint256 assets, address user) external {
        address sender = _msgSender();
        SafeERC20Upgradeable.safeTransferFrom(_assetIERC20(), sender, address(this), assets);

        uint256 assetsLessDeplete = assets;

        if (accPnlPerTokenUsed < 0 && accPnlPerToken < 0) {
            uint256 depleteAmount = (assets * lossesBurnP) / PRECISION_18 / 100;
            assetsToDeplete += depleteAmount;
            assetsLessDeplete -= depleteAmount;
        }

        int256 accPnlDelta = int256(
            (assetsLessDeplete * collateralConfig.precisionDelta * collateralConfig.precision) / totalSupply()
        );
        accPnlPerToken -= accPnlDelta;

        tryResetDailyAccPnlDelta();
        dailyAccPnlDelta -= accPnlDelta;

        totalLiability -= int256(assetsLessDeplete);
        totalClosedPnl -= int256(assetsLessDeplete);

        tryNewOpenPnlRequestOrEpoch();
        tryUpdateCurrentMaxSupply();

        emit AssetsReceived(sender, user, assets, assetsLessDeplete);
    }

    // GNS mint / burn mechanism
    function deplete(uint256 assets) external {
        if (assets > assetsToDeplete) revert AboveMax();
        assetsToDeplete -= assets;

        uint256 amountGns = assets.mulDiv(
            collateralConfig.precisionDelta * PRECISION_10,
            gnsTokenToAssetsPrice(),
            MathUpgradeable.Rounding.Up
        );

        address sender = _msgSender();
        IERC20(gnsToken).burn(sender, amountGns);

        totalDepleted += assets;
        totalDepletedGns += amountGns;

        _transferAssets(sender, assets);

        emit Depleted(sender, assets, amountGns);
    }

    function refill(uint256 assets) external {
        if (accPnlPerTokenUsed <= 0) revert NotUnderCollateralized();

        uint256 supply = totalSupply();
        if (assets > (uint256(accPnlPerTokenUsed) * supply) / PRECISION_18) revert AboveMax();

        if (block.timestamp - lastDailyMintedGnsReset >= 24 hours) {
            dailyMintedGns = 0;
            lastDailyMintedGnsReset = block.timestamp;
        }

        uint256 amountGns = (assets * collateralConfig.precisionDelta * PRECISION_10) / gnsTokenToAssetsPrice();
        dailyMintedGns += amountGns;

        if (dailyMintedGns > (maxGnsSupplyMintDailyP * IERC20Upgradeable(gnsToken).totalSupply()) / PRECISION_18 / 100)
            revert AboveInflationLimit();

        address sender = _msgSender();
        SafeERC20Upgradeable.safeTransferFrom(_assetIERC20(), sender, address(this), assets);

        int256 accPnlDelta = int256((assets * PRECISION_18) / supply);
        accPnlPerToken -= accPnlDelta;
        accPnlPerTokenUsed -= accPnlDelta;
        updateShareToAssetsPrice();

        totalRefilled += assets;
        totalRefilledGns += amountGns;

        IERC20(gnsToken).mint(sender, amountGns);

        emit Refilled(sender, assets, amountGns);
    }

    // Updates shareToAssetsPrice based on the new PnL and starts a new epoch
    function updateAccPnlPerTokenUsed(
        uint256 prevPositiveOpenPnl, // 1e18
        uint256 newPositiveOpenPnl // 1e18
    ) external returns (uint256) {
        address sender = _msgSender();
        if (sender != address(openTradesPnlFeed)) revert OnlyPnlFeed();

        int256 delta = int256(newPositiveOpenPnl) - int256(prevPositiveOpenPnl); // 1e18
        uint256 supply = totalSupply();

        int256 maxDelta = int256(
            MathUpgradeable.min(
                (uint256(int256(maxAccPnlPerToken()) - accPnlPerToken) * supply) / collateralConfig.precision,
                (maxAccOpenPnlDelta * supply) / collateralConfig.precision
            )
        ); // PRECISION_18

        delta = delta > maxDelta ? maxDelta : delta;

        accPnlPerToken += (delta * int256(uint256(collateralConfig.precision))) / int256(supply);
        totalLiability += delta / int256(uint256(collateralConfig.precisionDelta));

        accPnlPerTokenUsed = accPnlPerToken;
        updateShareToAssetsPrice();

        currentEpoch++;
        currentEpochStart = block.timestamp;
        currentEpochPositiveOpenPnl = uint256(int256(prevPositiveOpenPnl) + delta);

        tryUpdateCurrentMaxSupply();

        emit AccPnlPerTokenUsedUpdated(
            sender,
            currentEpoch,
            prevPositiveOpenPnl,
            newPositiveOpenPnl,
            currentEpochPositiveOpenPnl,
            accPnlPerTokenUsed
        );

        return currentEpochPositiveOpenPnl;
    }

    // Getters
    function getLockedDeposit(uint256 depositId) external view returns (LockedDeposit memory) {
        return lockedDeposits[depositId];
    }

    function tvl() public view returns (uint256) {
        return (maxAccPnlPerToken() * totalSupply()) / PRECISION_18; // collateralConfig.precision
    }

    function availableAssets() public view returns (uint256) {
        return (uint256(int256(maxAccPnlPerToken()) - accPnlPerTokenUsed) * totalSupply()) / PRECISION_18; // collateralConfig.precision
    }

    function marketCap() public view returns (uint256) {
        return (totalSupply() * shareToAssetsPrice) / PRECISION_18; // collateralConfig.precision
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC4626.sol)

pragma solidity ^0.8.0;

import "../token/ERC20/IERC20Upgradeable.sol";
import "../token/ERC20/extensions/IERC20MetadataUpgradeable.sol";

/**
 * @dev Interface of the ERC4626 "Tokenized Vault Standard", as defined in
 * https://eips.ethereum.org/EIPS/eip-4626[ERC-4626].
 *
 * _Available since v4.7._
 */
interface IERC4626Upgradeable is IERC20Upgradeable, IERC20MetadataUpgradeable {
    event Deposit(address indexed sender, address indexed owner, uint256 assets, uint256 shares);

    event Withdraw(
        address indexed sender,
        address indexed receiver,
        address indexed owner,
        uint256 assets,
        uint256 shares
    );

    /**
     * @dev Returns the address of the underlying token used for the Vault for accounting, depositing, and withdrawing.
     *
     * - MUST be an ERC-20 token contract.
     * - MUST NOT revert.
     */
    function asset() external view returns (address assetTokenAddress);

    /**
     * @dev Returns the total amount of the underlying asset that is “managed” by Vault.
     *
     * - SHOULD include any compounding that occurs from yield.
     * - MUST be inclusive of any fees that are charged against assets in the Vault.
     * - MUST NOT revert.
     */
    function totalAssets() external view returns (uint256 totalManagedAssets);

    /**
     * @dev Returns the amount of shares that the Vault would exchange for the amount of assets provided, in an ideal
     * scenario where all the conditions are met.
     *
     * - MUST NOT be inclusive of any fees that are charged against assets in the Vault.
     * - MUST NOT show any variations depending on the caller.
     * - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange.
     * - MUST NOT revert.
     *
     * NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the
     * “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and
     * from.
     */
    function convertToShares(uint256 assets) external view returns (uint256 shares);

    /**
     * @dev Returns the amount of assets that the Vault would exchange for the amount of shares provided, in an ideal
     * scenario where all the conditions are met.
     *
     * - MUST NOT be inclusive of any fees that are charged against assets in the Vault.
     * - MUST NOT show any variations depending on the caller.
     * - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange.
     * - MUST NOT revert.
     *
     * NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the
     * “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and
     * from.
     */
    function convertToAssets(uint256 shares) external view returns (uint256 assets);

    /**
     * @dev Returns the maximum amount of the underlying asset that can be deposited into the Vault for the receiver,
     * through a deposit call.
     *
     * - MUST return a limited value if receiver is subject to some deposit limit.
     * - MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of assets that may be deposited.
     * - MUST NOT revert.
     */
    function maxDeposit(address receiver) external view returns (uint256 maxAssets);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their deposit at the current block, given
     * current on-chain conditions.
     *
     * - MUST return as close to and no more than the exact amount of Vault shares that would be minted in a deposit
     *   call in the same transaction. I.e. deposit should return the same or more shares as previewDeposit if called
     *   in the same transaction.
     * - MUST NOT account for deposit limits like those returned from maxDeposit and should always act as though the
     *   deposit would be accepted, regardless if the user has enough tokens approved, etc.
     * - MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToShares and previewDeposit SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by depositing.
     */
    function previewDeposit(uint256 assets) external view returns (uint256 shares);

    /**
     * @dev Mints shares Vault shares to receiver by depositing exactly amount of underlying tokens.
     *
     * - MUST emit the Deposit event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
     *   deposit execution, and are accounted for during deposit.
     * - MUST revert if all of assets cannot be deposited (due to deposit limit being reached, slippage, the user not
     *   approving enough underlying tokens to the Vault contract, etc).
     *
     * NOTE: most implementations will require pre-approval of the Vault with the Vault’s underlying asset token.
     */
    function deposit(uint256 assets, address receiver) external returns (uint256 shares);

    /**
     * @dev Returns the maximum amount of the Vault shares that can be minted for the receiver, through a mint call.
     * - MUST return a limited value if receiver is subject to some mint limit.
     * - MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of shares that may be minted.
     * - MUST NOT revert.
     */
    function maxMint(address receiver) external view returns (uint256 maxShares);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their mint at the current block, given
     * current on-chain conditions.
     *
     * - MUST return as close to and no fewer than the exact amount of assets that would be deposited in a mint call
     *   in the same transaction. I.e. mint should return the same or fewer assets as previewMint if called in the
     *   same transaction.
     * - MUST NOT account for mint limits like those returned from maxMint and should always act as though the mint
     *   would be accepted, regardless if the user has enough tokens approved, etc.
     * - MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToAssets and previewMint SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by minting.
     */
    function previewMint(uint256 shares) external view returns (uint256 assets);

    /**
     * @dev Mints exactly shares Vault shares to receiver by depositing amount of underlying tokens.
     *
     * - MUST emit the Deposit event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the mint
     *   execution, and are accounted for during mint.
     * - MUST revert if all of shares cannot be minted (due to deposit limit being reached, slippage, the user not
     *   approving enough underlying tokens to the Vault contract, etc).
     *
     * NOTE: most implementations will require pre-approval of the Vault with the Vault’s underlying asset token.
     */
    function mint(uint256 shares, address receiver) external returns (uint256 assets);

    /**
     * @dev Returns the maximum amount of the underlying asset that can be withdrawn from the owner balance in the
     * Vault, through a withdraw call.
     *
     * - MUST return a limited value if owner is subject to some withdrawal limit or timelock.
     * - MUST NOT revert.
     */
    function maxWithdraw(address owner) external view returns (uint256 maxAssets);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their withdrawal at the current block,
     * given current on-chain conditions.
     *
     * - MUST return as close to and no fewer than the exact amount of Vault shares that would be burned in a withdraw
     *   call in the same transaction. I.e. withdraw should return the same or fewer shares as previewWithdraw if
     *   called
     *   in the same transaction.
     * - MUST NOT account for withdrawal limits like those returned from maxWithdraw and should always act as though
     *   the withdrawal would be accepted, regardless if the user has enough shares, etc.
     * - MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToShares and previewWithdraw SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by depositing.
     */
    function previewWithdraw(uint256 assets) external view returns (uint256 shares);

    /**
     * @dev Burns shares from owner and sends exactly assets of underlying tokens to receiver.
     *
     * - MUST emit the Withdraw event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
     *   withdraw execution, and are accounted for during withdraw.
     * - MUST revert if all of assets cannot be withdrawn (due to withdrawal limit being reached, slippage, the owner
     *   not having enough shares, etc).
     *
     * Note that some implementations will require pre-requesting to the Vault before a withdrawal may be performed.
     * Those methods should be performed separately.
     */
    function withdraw(uint256 assets, address receiver, address owner) external returns (uint256 shares);

    /**
     * @dev Returns the maximum amount of Vault shares that can be redeemed from the owner balance in the Vault,
     * through a redeem call.
     *
     * - MUST return a limited value if owner is subject to some withdrawal limit or timelock.
     * - MUST return balanceOf(owner) if owner is not subject to any withdrawal limit or timelock.
     * - MUST NOT revert.
     */
    function maxRedeem(address owner) external view returns (uint256 maxShares);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their redeemption at the current block,
     * given current on-chain conditions.
     *
     * - MUST return as close to and no more than the exact amount of assets that would be withdrawn in a redeem call
     *   in the same transaction. I.e. redeem should return the same or more assets as previewRedeem if called in the
     *   same transaction.
     * - MUST NOT account for redemption limits like those returned from maxRedeem and should always act as though the
     *   redemption would be accepted, regardless if the user has enough shares, etc.
     * - MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToAssets and previewRedeem SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by redeeming.
     */
    function previewRedeem(uint256 shares) external view returns (uint256 assets);

    /**
     * @dev Burns exactly shares from owner and sends assets of underlying tokens to receiver.
     *
     * - MUST emit the Withdraw event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
     *   redeem execution, and are accounted for during redeem.
     * - MUST revert if all of shares cannot be redeemed (due to withdrawal limit being reached, slippage, the owner
     *   not having enough shares, etc).
     *
     * NOTE: some implementations will require pre-requesting to the Vault before a withdrawal may be performed.
     * Those methods should be performed separately.
     */
    function redeem(uint256 shares, address receiver, address owner) external returns (uint256 assets);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized != type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20Upgradeable.sol";
import "./extensions/IERC20MetadataUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import {Initializable} from "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20Upgradeable is Initializable, ContextUpgradeable, IERC20Upgradeable, IERC20MetadataUpgradeable {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    function __ERC20_init(string memory name_, string memory symbol_) internal onlyInitializing {
        __ERC20_init_unchained(name_, symbol_);
    }

    function __ERC20_init_unchained(string memory name_, string memory symbol_) internal onlyInitializing {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[45] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/ERC4626.sol)

pragma solidity ^0.8.0;

import "../ERC20Upgradeable.sol";
import "../utils/SafeERC20Upgradeable.sol";
import "../../../interfaces/IERC4626Upgradeable.sol";
import "../../../utils/math/MathUpgradeable.sol";
import {Initializable} from "../../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the ERC4626 "Tokenized Vault Standard" as defined in
 * https://eips.ethereum.org/EIPS/eip-4626[EIP-4626].
 *
 * This extension allows the minting and burning of "shares" (represented using the ERC20 inheritance) in exchange for
 * underlying "assets" through standardized {deposit}, {mint}, {redeem} and {burn} workflows. This contract extends
 * the ERC20 standard. Any additional extensions included along it would affect the "shares" token represented by this
 * contract and not the "assets" token which is an independent contract.
 *
 * [CAUTION]
 * ====
 * In empty (or nearly empty) ERC-4626 vaults, deposits are at high risk of being stolen through frontrunning
 * with a "donation" to the vault that inflates the price of a share. This is variously known as a donation or inflation
 * attack and is essentially a problem of slippage. Vault deployers can protect against this attack by making an initial
 * deposit of a non-trivial amount of the asset, such that price manipulation becomes infeasible. Withdrawals may
 * similarly be affected by slippage. Users can protect against this attack as well as unexpected slippage in general by
 * verifying the amount received is as expected, using a wrapper that performs these checks such as
 * https://github.com/fei-protocol/ERC4626#erc4626router-and-base[ERC4626Router].
 *
 * Since v4.9, this implementation uses virtual assets and shares to mitigate that risk. The `_decimalsOffset()`
 * corresponds to an offset in the decimal representation between the underlying asset's decimals and the vault
 * decimals. This offset also determines the rate of virtual shares to virtual assets in the vault, which itself
 * determines the initial exchange rate. While not fully preventing the attack, analysis shows that the default offset
 * (0) makes it non-profitable, as a result of the value being captured by the virtual shares (out of the attacker's
 * donation) matching the attacker's expected gains. With a larger offset, the attack becomes orders of magnitude more
 * expensive than it is profitable. More details about the underlying math can be found
 * xref:erc4626.adoc#inflation-attack[here].
 *
 * The drawback of this approach is that the virtual shares do capture (a very small) part of the value being accrued
 * to the vault. Also, if the vault experiences losses, the users try to exit the vault, the virtual shares and assets
 * will cause the first user to exit to experience reduced losses in detriment to the last users that will experience
 * bigger losses. Developers willing to revert back to the pre-v4.9 behavior just need to override the
 * `_convertToShares` and `_convertToAssets` functions.
 *
 * To learn more, check out our xref:ROOT:erc4626.adoc[ERC-4626 guide].
 * ====
 *
 * _Available since v4.7._
 */
abstract contract ERC4626Upgradeable is Initializable, ERC20Upgradeable, IERC4626Upgradeable {
    using MathUpgradeable for uint256;

    IERC20Upgradeable private _asset;
    uint8 private _underlyingDecimals;

    /**
     * @dev Set the underlying asset contract. This must be an ERC20-compatible contract (ERC20 or ERC777).
     */
    function __ERC4626_init(IERC20Upgradeable asset_) internal onlyInitializing {
        __ERC4626_init_unchained(asset_);
    }

    function __ERC4626_init_unchained(IERC20Upgradeable asset_) internal onlyInitializing {
        (bool success, uint8 assetDecimals) = _tryGetAssetDecimals(asset_);
        _underlyingDecimals = success ? assetDecimals : 18;
        _asset = asset_;
    }

    /**
     * @dev Attempts to fetch the asset decimals. A return value of false indicates that the attempt failed in some way.
     */
    function _tryGetAssetDecimals(IERC20Upgradeable asset_) private view returns (bool, uint8) {
        (bool success, bytes memory encodedDecimals) = address(asset_).staticcall(
            abi.encodeWithSelector(IERC20MetadataUpgradeable.decimals.selector)
        );
        if (success && encodedDecimals.length >= 32) {
            uint256 returnedDecimals = abi.decode(encodedDecimals, (uint256));
            if (returnedDecimals <= type(uint8).max) {
                return (true, uint8(returnedDecimals));
            }
        }
        return (false, 0);
    }

    /**
     * @dev Decimals are computed by adding the decimal offset on top of the underlying asset's decimals. This
     * "original" value is cached during construction of the vault contract. If this read operation fails (e.g., the
     * asset has not been created yet), a default of 18 is used to represent the underlying asset's decimals.
     *
     * See {IERC20Metadata-decimals}.
     */
    function decimals() public view virtual override(IERC20MetadataUpgradeable, ERC20Upgradeable) returns (uint8) {
        return _underlyingDecimals + _decimalsOffset();
    }

    /** @dev See {IERC4626-asset}. */
    function asset() public view virtual override returns (address) {
        return address(_asset);
    }

    /** @dev See {IERC4626-totalAssets}. */
    function totalAssets() public view virtual override returns (uint256) {
        return _asset.balanceOf(address(this));
    }

    /** @dev See {IERC4626-convertToShares}. */
    function convertToShares(uint256 assets) public view virtual override returns (uint256) {
        return _convertToShares(assets, MathUpgradeable.Rounding.Down);
    }

    /** @dev See {IERC4626-convertToAssets}. */
    function convertToAssets(uint256 shares) public view virtual override returns (uint256) {
        return _convertToAssets(shares, MathUpgradeable.Rounding.Down);
    }

    /** @dev See {IERC4626-maxDeposit}. */
    function maxDeposit(address) public view virtual override returns (uint256) {
        return type(uint256).max;
    }

    /** @dev See {IERC4626-maxMint}. */
    function maxMint(address) public view virtual override returns (uint256) {
        return type(uint256).max;
    }

    /** @dev See {IERC4626-maxWithdraw}. */
    function maxWithdraw(address owner) public view virtual override returns (uint256) {
        return _convertToAssets(balanceOf(owner), MathUpgradeable.Rounding.Down);
    }

    /** @dev See {IERC4626-maxRedeem}. */
    function maxRedeem(address owner) public view virtual override returns (uint256) {
        return balanceOf(owner);
    }

    /** @dev See {IERC4626-previewDeposit}. */
    function previewDeposit(uint256 assets) public view virtual override returns (uint256) {
        return _convertToShares(assets, MathUpgradeable.Rounding.Down);
    }

    /** @dev See {IERC4626-previewMint}. */
    function previewMint(uint256 shares) public view virtual override returns (uint256) {
        return _convertToAssets(shares, MathUpgradeable.Rounding.Up);
    }

    /** @dev See {IERC4626-previewWithdraw}. */
    function previewWithdraw(uint256 assets) public view virtual override returns (uint256) {
        return _convertToShares(assets, MathUpgradeable.Rounding.Up);
    }

    /** @dev See {IERC4626-previewRedeem}. */
    function previewRedeem(uint256 shares) public view virtual override returns (uint256) {
        return _convertToAssets(shares, MathUpgradeable.Rounding.Down);
    }

    /** @dev See {IERC4626-deposit}. */
    function deposit(uint256 assets, address receiver) public virtual override returns (uint256) {
        require(assets <= maxDeposit(receiver), "ERC4626: deposit more than max");

        uint256 shares = previewDeposit(assets);
        _deposit(_msgSender(), receiver, assets, shares);

        return shares;
    }

    /** @dev See {IERC4626-mint}.
     *
     * As opposed to {deposit}, minting is allowed even if the vault is in a state where the price of a share is zero.
     * In this case, the shares will be minted without requiring any assets to be deposited.
     */
    function mint(uint256 shares, address receiver) public virtual override returns (uint256) {
        require(shares <= maxMint(receiver), "ERC4626: mint more than max");

        uint256 assets = previewMint(shares);
        _deposit(_msgSender(), receiver, assets, shares);

        return assets;
    }

    /** @dev See {IERC4626-withdraw}. */
    function withdraw(uint256 assets, address receiver, address owner) public virtual override returns (uint256) {
        require(assets <= maxWithdraw(owner), "ERC4626: withdraw more than max");

        uint256 shares = previewWithdraw(assets);
        _withdraw(_msgSender(), receiver, owner, assets, shares);

        return shares;
    }

    /** @dev See {IERC4626-redeem}. */
    function redeem(uint256 shares, address receiver, address owner) public virtual override returns (uint256) {
        require(shares <= maxRedeem(owner), "ERC4626: redeem more than max");

        uint256 assets = previewRedeem(shares);
        _withdraw(_msgSender(), receiver, owner, assets, shares);

        return assets;
    }

    /**
     * @dev Internal conversion function (from assets to shares) with support for rounding direction.
     */
    function _convertToShares(uint256 assets, MathUpgradeable.Rounding rounding) internal view virtual returns (uint256) {
        return assets.mulDiv(totalSupply() + 10 ** _decimalsOffset(), totalAssets() + 1, rounding);
    }

    /**
     * @dev Internal conversion function (from shares to assets) with support for rounding direction.
     */
    function _convertToAssets(uint256 shares, MathUpgradeable.Rounding rounding) internal view virtual returns (uint256) {
        return shares.mulDiv(totalAssets() + 1, totalSupply() + 10 ** _decimalsOffset(), rounding);
    }

    /**
     * @dev Deposit/mint common workflow.
     */
    function _deposit(address caller, address receiver, uint256 assets, uint256 shares) internal virtual {
        // If _asset is ERC777, `transferFrom` can trigger a reentrancy BEFORE the transfer happens through the
        // `tokensToSend` hook. On the other hand, the `tokenReceived` hook, that is triggered after the transfer,
        // calls the vault, which is assumed not malicious.
        //
        // Conclusion: we need to do the transfer before we mint so that any reentrancy would happen before the
        // assets are transferred and before the shares are minted, which is a valid state.
        // slither-disable-next-line reentrancy-no-eth
        SafeERC20Upgradeable.safeTransferFrom(_asset, caller, address(this), assets);
        _mint(receiver, shares);

        emit Deposit(caller, receiver, assets, shares);
    }

    /**
     * @dev Withdraw/redeem common workflow.
     */
    function _withdraw(
        address caller,
        address receiver,
        address owner,
        uint256 assets,
        uint256 shares
    ) internal virtual {
        if (caller != owner) {
            _spendAllowance(owner, caller, shares);
        }

        // If _asset is ERC777, `transfer` can trigger a reentrancy AFTER the transfer happens through the
        // `tokensReceived` hook. On the other hand, the `tokensToSend` hook, that is triggered before the transfer,
        // calls the vault, which is assumed not malicious.
        //
        // Conclusion: we need to do the transfer after the burn so that any reentrancy would happen after the
        // shares are burned and after the assets are transferred, which is a valid state.
        _burn(owner, shares);
        SafeERC20Upgradeable.safeTransfer(_asset, receiver, assets);

        emit Withdraw(caller, receiver, owner, assets, shares);
    }

    function _decimalsOffset() internal view virtual returns (uint8) {
        return 0;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20MetadataUpgradeable is IERC20Upgradeable {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20PermitUpgradeable {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";
import "../extensions/IERC20PermitUpgradeable.sol";
import "../../../utils/AddressUpgradeable.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20Upgradeable {
    using AddressUpgradeable for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20Upgradeable token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20Upgradeable token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20Upgradeable token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20Upgradeable token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20Upgradeable token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20Upgradeable token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20PermitUpgradeable token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20Upgradeable token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20Upgradeable token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && AddressUpgradeable.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library MathUpgradeable {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

/**
 * @dev Interface for Arbitrum special l2 functions
 */
interface IArbSys {
    function arbBlockNumber() external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {IERC20Metadata} from "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";

/**
 * @dev Interface for ERC20 tokens
 */
interface IERC20 is IERC20Metadata {
    function burn(address, uint256) external;

    function mint(address, uint256) external;

    function hasRole(bytes32, address) external view returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

/**
 * @dev Interface for errors potentially used in all libraries (general names)
 */
interface IGeneralErrors {
    error InitError();
    error InvalidAddresses();
    error InvalidAddress();
    error InvalidInputLength();
    error InvalidCollateralIndex();
    error WrongParams();
    error WrongLength();
    error WrongOrder();
    error WrongIndex();
    error BlockOrder();
    error Overflow();
    error ZeroAddress();
    error ZeroValue();
    error AlreadyExists();
    error DoesntExist();
    error Paused();
    error BelowMin();
    error AboveMax();
    error NotAuthorized();
    error WrongTradeType();
    error WrongOrderType();
    error InsufficientBalance();
    error UnsupportedChain();
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

/**
 * @dev Interface for GToken contract
 */
interface IGToken {
    struct GnsPriceProvider {
        address addr;
        bytes signature;
    }

    struct LockedDeposit {
        address owner;
        uint256 shares; // collateralConfig.precision
        uint256 assetsDeposited; // collateralConfig.precision
        uint256 assetsDiscount; // collateralConfig.precision
        uint256 atTimestamp; // timestamp
        uint256 lockDuration; // timestamp
    }

    struct ContractAddresses {
        address asset;
        address owner; // 2-week timelock contract
        address manager; // 3-day timelock contract
        address admin; // bypasses timelock, access to emergency functions
        address gnsToken;
        address lockedDepositNft;
        address pnlHandler;
        address openTradesPnlFeed;
        GnsPriceProvider gnsPriceProvider;
    }

    struct Meta {
        string name;
        string symbol;
    }

    function manager() external view returns (address);

    function admin() external view returns (address);

    function currentEpoch() external view returns (uint256);

    function currentEpochStart() external view returns (uint256);

    function currentEpochPositiveOpenPnl() external view returns (uint256);

    function updateAccPnlPerTokenUsed(
        uint256 prevPositiveOpenPnl,
        uint256 newPositiveOpenPnl
    ) external returns (uint256);

    function getLockedDeposit(uint256 depositId) external view returns (LockedDeposit memory);

    function sendAssets(uint256 assets, address receiver) external;

    function receiveAssets(uint256 assets, address user) external;

    function distributeReward(uint256 assets) external;

    function tvl() external view returns (uint256);

    function marketCap() external view returns (uint256);

    function shareToAssetsPrice() external view returns (uint256);

    function collateralConfig() external view returns (uint128, uint128);

    event ManagerUpdated(address newValue);
    event AdminUpdated(address newValue);
    event PnlHandlerUpdated(address newValue);
    event OpenTradesPnlFeedUpdated(address newValue);
    event GnsPriceProviderUpdated(GnsPriceProvider newValue);
    event WithdrawLockThresholdsPUpdated(uint256[2] newValue);
    event MaxAccOpenPnlDeltaUpdated(uint256 newValue);
    event MaxDailyAccPnlDeltaUpdated(uint256 newValue);
    event MaxSupplyIncreaseDailyPUpdated(uint256 newValue);
    event LossesBurnPUpdated(uint256 newValue);
    event MaxGnsSupplyMintDailyPUpdated(uint256 newValue);
    event MaxDiscountPUpdated(uint256 newValue);
    event MaxDiscountThresholdPUpdated(uint256 newValue);

    event CurrentMaxSupplyUpdated(uint256 newValue);
    event DailyAccPnlDeltaReset();
    event ShareToAssetsPriceUpdated(uint256 newValue);
    event OpenTradesPnlFeedCallFailed();

    event WithdrawRequested(
        address indexed sender,
        address indexed owner,
        uint256 shares,
        uint256 currEpoch,
        uint256 indexed unlockEpoch
    );
    event WithdrawCanceled(
        address indexed sender,
        address indexed owner,
        uint256 shares,
        uint256 currEpoch,
        uint256 indexed unlockEpoch
    );

    event DepositLocked(address indexed sender, address indexed owner, uint256 depositId, LockedDeposit d);
    event DepositUnlocked(
        address indexed sender,
        address indexed receiver,
        address indexed owner,
        uint256 depositId,
        LockedDeposit d
    );

    event RewardDistributed(address indexed sender, uint256 assets);

    event AssetsSent(address indexed sender, address indexed receiver, uint256 assets);
    event AssetsReceived(address indexed sender, address indexed user, uint256 assets, uint256 assetsLessDeplete);

    event Depleted(address indexed sender, uint256 assets, uint256 amountGns);
    event Refilled(address indexed sender, uint256 assets, uint256 amountGns);

    event AccPnlPerTokenUsedUpdated(
        address indexed sender,
        uint256 indexed newEpoch,
        uint256 prevPositiveOpenPnl,
        uint256 newPositiveOpenPnl,
        uint256 newEpochPositiveOpenPnl,
        int256 newAccPnlPerTokenUsed
    );

    error OnlyManager();
    error OnlyTradingPnlHandler();
    error OnlyPnlFeed();
    error AddressZero();
    error PriceZero();
    error ValueZero();
    error BytesZero();
    error NoActiveDiscount();
    error BelowMin();
    error AboveMax();
    error WrongValue();
    error WrongValues();
    error GnsPriceCallFailed();
    error GnsTokenPriceZero();
    error PendingWithdrawal();
    error EndOfEpoch();
    error NotAllowed();
    error NoDiscount();
    error NotUnlocked();
    error NotEnoughAssets();
    error MaxDailyPnl();
    error NotUnderCollateralized();
    error AboveInflationLimit();

    // Ownable
    error OwnableInvalidOwner(address owner);

    // ERC4626
    error ERC4626ExceededMaxDeposit();
    error ERC4626ExceededMaxMint();
    error ERC4626ExceededMaxWithdraw();
    error ERC4626ExceededMaxRedeem();
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {IERC721} from "@openzeppelin/contracts/token/ERC721/IERC721.sol";

import "./IGTokenLockedDepositNftDesign.sol";

/**
 * @dev Interface for GTokenLockedDepositNft contract
 */
interface IGTokenLockedDepositNft is IERC721 {
    function mint(address to, uint256 tokenId) external;

    function burn(uint256 tokenId) external;

    event DesignUpdated(IGTokenLockedDepositNftDesign newValue);
    event DesignDecimalsUpdated(uint8 newValue);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import "./IGToken.sol";

/**
 * @dev Interface for GTokenLockedDepositNftDesign contract
 */
interface IGTokenLockedDepositNftDesign {
    function buildTokenURI(
        uint256 tokenId,
        IGToken.LockedDeposit memory lockedDeposit,
        string memory gTokenSymbol,
        string memory assetSymbol,
        uint8 numberInputDecimals,
        uint8 numberOutputDecimals
    ) external pure returns (string memory);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

/**
 * @dev Interface for GTokenOpenPnlFeed contract
 */
interface IGTokenOpenPnlFeed {
    struct Request {
        bool initiated;
        bool active;
        uint256 linkFeePerNode;
    }

    function nextEpochValuesRequestCount() external view returns (uint256);

    function newOpenPnlRequestOrEpoch() external;

    function fulfill(bytes32 requestId, int256 value) external;

    event NumberParamUpdated(string name, uint256 newValue);
    event OracleUpdated(uint256 index, address newValue);
    event OraclesUpdated(address[] newValues);
    event JobUpdated(bytes32 newValue);

    event NextEpochValuesReset(uint256 indexed currEpoch, uint256 requestsResetCount);

    event NewEpochForced(uint256 indexed newEpoch);

    event NextEpochValueRequested(
        uint256 indexed currEpoch,
        uint256 indexed requestId,
        bytes32 job,
        uint256 oraclesCount,
        uint256 linkFeePerNode
    );

    event NewEpoch(
        uint256 indexed newEpoch,
        uint256 indexed requestId,
        int256[] epochMedianValues,
        int256 epochAverageValue,
        uint256 newEpochPositiveOpenPnl
    );

    event RequestValueReceived(
        bool isLate,
        uint256 indexed currEpoch,
        uint256 indexed requestId,
        bytes32 oracleRequestId,
        address indexed oracle,
        int256 requestValue,
        uint256 linkFee
    );

    event RequestMedianValueSet(
        uint256 indexed currEpoch,
        uint256 indexed requestId,
        int256[] requestValues,
        int256 medianValue
    );
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

/**
 * @dev Interface for WETH9 token
 */
interface IWETH9 {
    function approve(address spender, uint256 amount) external returns (bool);

    function transfer(address to, uint256 amount) external returns (bool);

    function deposit() external payable;

    function withdraw(uint256) external;

    function balanceOf(address account) external view returns (uint256);

    event Approval(address indexed src, address indexed guy, uint256 wad);
    event Transfer(address indexed src, address indexed dst, uint256 wad);
    event Deposit(address indexed dst, uint256 wad);
    event Withdrawal(address indexed src, uint256 wad);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

/**
 * @dev Interface for BlockManager_Mock contract (test helper)
 */
interface IBlockManager_Mock {
    function getBlockNumber() external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {Math} from "@openzeppelin/contracts/utils/math/Math.sol";

import "../interfaces/IArbSys.sol";
import "../interfaces/IGeneralErrors.sol";
import "../interfaces/mock/IBlockManager_Mock.sol";

/**
 * @dev Chain helpers internal library
 */
library ChainUtils {
    // Supported chains
    uint256 internal constant ARBITRUM_MAINNET = 42161;
    uint256 internal constant ARBITRUM_SEPOLIA = 421614;
    uint256 internal constant POLYGON_MAINNET = 137;
    uint256 internal constant BASE_MAINNET = 8453;
    uint256 internal constant APECHAIN_MAINNET = 33139;
    uint256 internal constant TESTNET = 31337;

    // Wrapped native tokens
    address private constant ARBITRUM_MAINNET_WETH = 0x82aF49447D8a07e3bd95BD0d56f35241523fBab1;
    address private constant ARBITRUM_SEPOLIA_WETH = 0x980B62Da83eFf3D4576C647993b0c1D7faf17c73;
    address private constant POLYGON_MAINNET_WMATIC = 0x0d500B1d8E8eF31E21C99d1Db9A6444d3ADf1270;
    address private constant BASE_MAINNET_WETH = 0x4200000000000000000000000000000000000006;
    address private constant APECHAIN_MAINNET_WAPE = 0x00000000000f7e000644657dC9417b185962645a; // Custom non-rebasing WAPE

    IArbSys private constant ARB_SYS = IArbSys(address(100));

    error Overflow();
    /**
     * @dev Returns the current block number (l2 block for arbitrum)
     */
    function getBlockNumber() internal view returns (uint256) {
        if (block.chainid == ARBITRUM_MAINNET || block.chainid == ARBITRUM_SEPOLIA) {
            return ARB_SYS.arbBlockNumber();
        }

        if (block.chainid == TESTNET) {
            return IBlockManager_Mock(address(420)).getBlockNumber();
        }

        return block.number;
    }

    /**
     * @dev Returns blockNumber converted to uint48
     * @param blockNumber block number to convert
     */
    function getUint48BlockNumber(uint256 blockNumber) internal pure returns (uint48) {
        if (blockNumber > type(uint48).max) revert Overflow();
        return uint48(blockNumber);
    }

    /**
     * @dev Returns the wrapped native token address for the current chain
     */
    function getWrappedNativeToken() internal view returns (address) {
        if (block.chainid == ARBITRUM_MAINNET) {
            return ARBITRUM_MAINNET_WETH;
        }

        if (block.chainid == BASE_MAINNET) {
            return BASE_MAINNET_WETH;
        }

        if (block.chainid == APECHAIN_MAINNET) {
            return APECHAIN_MAINNET_WAPE;
        }

        if (block.chainid == POLYGON_MAINNET) {
            return POLYGON_MAINNET_WMATIC;
        }

        if (block.chainid == ARBITRUM_SEPOLIA) {
            return ARBITRUM_SEPOLIA_WETH;
        }

        if (block.chainid == TESTNET) {
            return address(421);
        }

        return address(0);
    }

    /**
     * @dev Returns whether a token is the wrapped native token for the current chain
     * @param _token token address to check
     */
    function isWrappedNativeToken(address _token) internal view returns (bool) {
        return _token != address(0) && _token == getWrappedNativeToken();
    }

    /**
     * @dev Converts blocks to seconds for the current chain.
     * @dev Important: the result is an estimation and may not be accurate. Use with caution.
     * @param _blocks block count to convert to seconds
     */
    function convertBlocksToSeconds(uint256 _blocks) internal view returns (uint256) {
        uint256 millisecondsPerBlock;

        if (block.chainid == ARBITRUM_MAINNET || block.chainid == ARBITRUM_SEPOLIA) {
            millisecondsPerBlock = 300; // 0.3 seconds per block
        } else if (block.chainid == BASE_MAINNET) {
            millisecondsPerBlock = 2000; // 2 seconds per block
        } else if (block.chainid == POLYGON_MAINNET) {
            millisecondsPerBlock = 2200; // 2.2 seconds per block
        } else if (block.chainid == APECHAIN_MAINNET) {
            millisecondsPerBlock = 12000; // for apescan we use L1 blocktime (12s)
        } else if (block.chainid == TESTNET) {
            millisecondsPerBlock = 1000; // 1 second per block
        } else {
            revert IGeneralErrors.UnsupportedChain();
        }

        return Math.mulDiv(_blocks, millisecondsPerBlock, 1000, Math.Rounding.Up);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import "../interfaces/IERC20.sol";

/**
 * @dev Collaterals decimal precision internal library
 */
library CollateralUtils {
    struct CollateralConfig {
        uint128 precision;
        uint128 precisionDelta;
    }

    /**
     * @dev Calculates `precision` (10^decimals) and `precisionDelta` (precision difference
     * between 18 decimals and `token` decimals) of a given IERC20 `token`
     *
     * Notice: not compatible with tokens with more than 18 decimals
     *
     * @param   _token collateral token address
     */
    function getCollateralConfig(address _token) internal view returns (CollateralConfig memory _meta) {
        uint256 _decimals = uint256(IERC20(_token).decimals());

        _meta.precision = uint128(10 ** _decimals);
        _meta.precisionDelta = uint128(10 ** (18 - _decimals));
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import "../interfaces/IWETH9.sol";
import "../interfaces/IERC20.sol";

/**
 * @dev Library to handle transfers of tokens, including native tokens.
 */
library TokenTransferUtils {
    using SafeERC20 for IERC20;

    /**
     * @dev Unwraps and transfers `_amount` of native tokens to a recipient, `_to`.
     *
     * IMPORTANT:
     * If the recipient does not accept the native transfer then the tokens are re-wrapped and transferred as ERC20.
     * Always ensure CEI pattern is followed or reentrancy guards are in place before performing native transfers.
     *
     * @param _token the wrapped native token address
     * @param _to the recipient
     * @param _amount the amount of tokens to transfer
     * @param _gasLimit how much gas to forward.
     */
    function unwrapAndTransferNative(address _token, address _to, uint256 _amount, uint256 _gasLimit) internal {
        // 1. Unwrap `_amount` of `_token`
        IWETH9(_token).withdraw(_amount);

        // 2. Attempt to transfer native tokens
        // Uses low-level call and loads no return data into memory to prevent `returnbomb` attacks
        // See https://gist.github.com/pcaversaccio/3b487a24922c839df22f925babd3c809 for an example
        bool success;
        assembly {
            // call(gas, address, value, argsOffset, argsSize, retOffset, retSize)
            success := call(_gasLimit, _to, _amount, 0, 0, 0, 0)
        }

        // 3. If the native transfer was successful, return
        if (success) return;

        // 4. Otherwise re-wrap `_amount` of `_token`
        IWETH9(_token).deposit{value: _amount}();

        // 5. Send with an ERC20 transfer
        transfer(_token, _to, _amount);
    }

    /**
     * @dev Transfers `_amount` of `_token` to a recipient, `to`
     * @param _token the token address
     * @param _to the recipient
     * @param _amount amount of tokens to transfer
     */
    function transfer(address _token, address _to, uint256 _amount) internal {
        IERC20(_token).safeTransfer(_to, _amount);
    }

    /**
     * @dev Transfers `_amount` of `_token` from a sender, `_from`, to a recipient, `to`.
     * @param _token the token address
     * @param _from the sender
     * @param _to the recipient
     * @param _amount amount of tokens to transfer
     */
    function transferFrom(address _token, address _from, address _to, uint256 _amount) internal {
        IERC20(_token).safeTransferFrom(_from, _to, _amount);
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 55
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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