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// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.28;

import {IEntropy} from "@pythnetwork/entropy-sdk-solidity/IEntropy.sol";
import {IEntropyConsumer} from "@pythnetwork/entropy-sdk-solidity/IEntropyConsumer.sol";

struct MatchedBet {
    address player1;
    uint96 requestFee;
    address player2;
    uint96 amount;
}

contract HeadToHead is IEntropyConsumer {
    error InvalidAmount();
    error NoMatchAvailable();
    error TransferFailed();

    IEntropy public constant entropy = IEntropy(0x36825bf3Fbdf5a29E2d5148bfe7Dcf7B5639e320);
    address public constant provider = 0x52DeaA1c84233F7bb8C8A45baeDE41091c616506;

    // Maps bet amounts to pending players waiting for matches
    mapping(uint256 => address) public pendingBets;
    mapping(uint256 => MatchedBet) public matchedBets;

    event BetPlaced(address indexed player, uint256 amount);
    event BetMatched(address indexed player1, address indexed player2, uint256 amount);
    event BetResolved(address indexed winner, address indexed loser, uint256 amount);
    event BetCancelled(address indexed player, uint256 amount);

    // Automatically place bet when receiving ETH
    receive() external payable {
        _placeBet();
    }

    function entropyCallback(
        uint64 sequenceNumber,
        address,
        bytes32 randomNumber
    ) internal override {
        MatchedBet memory bet = matchedBets[sequenceNumber];

        address player1 = bet.player1;
        address player2 = bet.player2;
        uint256 requestFee = uint256(bet.requestFee);
        uint256 betAmount = uint256(bet.amount);

        // Determine winner
        address winner = uint256(randomNumber) % 2 == 0 ? player1 : player2;
        address loser = winner == player1 ? player2 : player1;

        // transfer to winner
        (bool success,) = winner.call{value: betAmount * 2 - requestFee}("");
        if (!success) revert TransferFailed();

        emit BetResolved(winner, loser, betAmount);
    }

    function _placeBet() internal {
        // Validate bet amount is a power of 10 ether
        if (msg.value == 0 || !_isPowerOfTen(msg.value)) revert InvalidAmount();

        address opponent = pendingBets[msg.value];

        if (opponent == address(0)) {
            // No match available, store as pending
            pendingBets[msg.value] = msg.sender;
            emit BetPlaced(msg.sender, msg.value);
        } else {
            // Match found! Remove pending bet and play
            pendingBets[msg.value] = address(0);
            _playGame(opponent);
        }
    }

    function _playGame(address opponent) internal {
        bytes32 pseudoRandomNumber = keccak256(abi.encodePacked(block.timestamp, block.number, msg.sender));

        // get the required fee
        uint128 requestFee = entropy.getFee(provider);

        // pay the fees and request a random number from entropy
        uint64 sequenceNumber = entropy.requestWithCallback{ value: requestFee }(
            provider,
            pseudoRandomNumber
        );

        matchedBets[sequenceNumber] = MatchedBet(msg.sender, uint96(requestFee), opponent, uint96(msg.value));

        emit BetMatched(msg.sender, opponent, msg.value);
    }

    function cancelBet(uint256 amount) external {
        if (pendingBets[amount] != msg.sender) revert NoMatchAvailable();

        pendingBets[amount] = address(0);
        (bool success,) = msg.sender.call{value: amount}("");
        if (!success) revert TransferFailed();

        emit BetCancelled(msg.sender, amount);
    }

    // This method is required by the IEntropyConsumer interface
    function getEntropy() internal view override returns (address) {
        return address(entropy);
    }

    // Helper function to check if amount is a power of 10 ether
    function _isPowerOfTen(uint256 amount) internal pure returns (bool) {
        // First check if it's in whole ether (no wei fractions)
        if (amount % 1 ether != 0) return false;

        // Convert to ether units for power of 10 check
        uint256 etherAmount = amount / 1 ether;

        // Add safety check for maximum reasonable bet
        if (etherAmount > 1e9) return false; // Max 1 billion APE

        // If not 1, keep dividing by 10 and check remainder
        while (etherAmount > 1) {
            if (etherAmount % 10 != 0) return false;
            etherAmount = etherAmount / 10;
        }

        return etherAmount == 1;
    }
}

// SPDX-License-Identifier: Apache 2
pragma solidity ^0.8.0;

import "./EntropyEvents.sol";

interface IEntropy is EntropyEvents {
    // Register msg.sender as a randomness provider. The arguments are the provider's configuration parameters
    // and initial commitment. Re-registering the same provider rotates the provider's commitment (and updates
    // the feeInWei).
    //
    // chainLength is the number of values in the hash chain *including* the commitment, that is, chainLength >= 1.
    function register(
        uint128 feeInWei,
        bytes32 commitment,
        bytes calldata commitmentMetadata,
        uint64 chainLength,
        bytes calldata uri
    ) external;

    // Withdraw a portion of the accumulated fees for the provider msg.sender.
    // Calling this function will transfer `amount` wei to the caller (provided that they have accrued a sufficient
    // balance of fees in the contract).
    function withdraw(uint128 amount) external;

    // Withdraw a portion of the accumulated fees for provider. The msg.sender must be the fee manager for this provider.
    // Calling this function will transfer `amount` wei to the caller (provided that they have accrued a sufficient
    // balance of fees in the contract).
    function withdrawAsFeeManager(address provider, uint128 amount) external;

    // As a user, request a random number from `provider`. Prior to calling this method, the user should
    // generate a random number x and keep it secret. The user should then compute hash(x) and pass that
    // as the userCommitment argument. (You may call the constructUserCommitment method to compute the hash.)
    //
    // This method returns a sequence number. The user should pass this sequence number to
    // their chosen provider (the exact method for doing so will depend on the provider) to retrieve the provider's
    // number. The user should then call fulfillRequest to construct the final random number.
    //
    // This method will revert unless the caller provides a sufficient fee (at least getFee(provider)) as msg.value.
    // Note that excess value is *not* refunded to the caller.
    function request(
        address provider,
        bytes32 userCommitment,
        bool useBlockHash
    ) external payable returns (uint64 assignedSequenceNumber);

    // Request a random number. The method expects the provider address and a secret random number
    // in the arguments. It returns a sequence number.
    //
    // The address calling this function should be a contract that inherits from the IEntropyConsumer interface.
    // The `entropyCallback` method on that interface will receive a callback with the generated random number.
    //
    // This method will revert unless the caller provides a sufficient fee (at least getFee(provider)) as msg.value.
    // Note that excess value is *not* refunded to the caller.
    function requestWithCallback(
        address provider,
        bytes32 userRandomNumber
    ) external payable returns (uint64 assignedSequenceNumber);

    // Fulfill a request for a random number. This method validates the provided userRandomness and provider's proof
    // against the corresponding commitments in the in-flight request. If both values are validated, this function returns
    // the corresponding random number.
    //
    // Note that this function can only be called once per in-flight request. Calling this function deletes the stored
    // request information (so that the contract doesn't use a linear amount of storage in the number of requests).
    // If you need to use the returned random number more than once, you are responsible for storing it.
    function reveal(
        address provider,
        uint64 sequenceNumber,
        bytes32 userRevelation,
        bytes32 providerRevelation
    ) external returns (bytes32 randomNumber);

    // Fulfill a request for a random number. This method validates the provided userRandomness
    // and provider's revelation against the corresponding commitment in the in-flight request. If both values are validated
    // and the requestor address is a contract address, this function calls the requester's entropyCallback method with the
    // sequence number, provider address and the random number as arguments. Else if the requestor is an EOA, it won't call it.
    //
    // Note that this function can only be called once per in-flight request. Calling this function deletes the stored
    // request information (so that the contract doesn't use a linear amount of storage in the number of requests).
    // If you need to use the returned random number more than once, you are responsible for storing it.
    //
    // Anyone can call this method to fulfill a request, but the callback will only be made to the original requester.
    function revealWithCallback(
        address provider,
        uint64 sequenceNumber,
        bytes32 userRandomNumber,
        bytes32 providerRevelation
    ) external;

    function getProviderInfo(
        address provider
    ) external view returns (EntropyStructs.ProviderInfo memory info);

    function getDefaultProvider() external view returns (address provider);

    function getRequest(
        address provider,
        uint64 sequenceNumber
    ) external view returns (EntropyStructs.Request memory req);

    function getFee(address provider) external view returns (uint128 feeAmount);

    function getAccruedPythFees()
        external
        view
        returns (uint128 accruedPythFeesInWei);

    function setProviderFee(uint128 newFeeInWei) external;

    function setProviderFeeAsFeeManager(
        address provider,
        uint128 newFeeInWei
    ) external;

    function setProviderUri(bytes calldata newUri) external;

    // Set manager as the fee manager for the provider msg.sender.
    // After calling this function, manager will be able to set the provider's fees and withdraw them.
    // Only one address can be the fee manager for a provider at a time -- calling this function again with a new value
    // will override the previous value. Call this function with the all-zero address to disable the fee manager role.
    function setFeeManager(address manager) external;

    function constructUserCommitment(
        bytes32 userRandomness
    ) external pure returns (bytes32 userCommitment);

    function combineRandomValues(
        bytes32 userRandomness,
        bytes32 providerRandomness,
        bytes32 blockHash
    ) external pure returns (bytes32 combinedRandomness);
}

// SPDX-License-Identifier: Apache 2
pragma solidity ^0.8.0;

abstract contract IEntropyConsumer {
    // This method is called by Entropy to provide the random number to the consumer.
    // It asserts that the msg.sender is the Entropy contract. It is not meant to be
    // override by the consumer.
    function _entropyCallback(
        uint64 sequence,
        address provider,
        bytes32 randomNumber
    ) external {
        address entropy = getEntropy();
        require(entropy != address(0), "Entropy address not set");
        require(msg.sender == entropy, "Only Entropy can call this function");

        entropyCallback(sequence, provider, randomNumber);
    }

    // getEntropy returns Entropy contract address. The method is being used to check that the
    // callback is indeed from Entropy contract. The consumer is expected to implement this method.
    // Entropy address can be found here - https://docs.pyth.network/entropy/contract-addresses
    function getEntropy() internal view virtual returns (address);

    // This method is expected to be implemented by the consumer to handle the random number.
    // It will be called by _entropyCallback after _entropyCallback ensures that the call is
    // indeed from Entropy contract.
    function entropyCallback(
        uint64 sequence,
        address provider,
        bytes32 randomNumber
    ) internal virtual;
}

// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.0;

import "./EntropyStructs.sol";

interface EntropyEvents {
    event Registered(EntropyStructs.ProviderInfo provider);

    event Requested(EntropyStructs.Request request);
    event RequestedWithCallback(
        address indexed provider,
        address indexed requestor,
        uint64 indexed sequenceNumber,
        bytes32 userRandomNumber,
        EntropyStructs.Request request
    );

    event Revealed(
        EntropyStructs.Request request,
        bytes32 userRevelation,
        bytes32 providerRevelation,
        bytes32 blockHash,
        bytes32 randomNumber
    );
    event RevealedWithCallback(
        EntropyStructs.Request request,
        bytes32 userRandomNumber,
        bytes32 providerRevelation,
        bytes32 randomNumber
    );

    event ProviderFeeUpdated(address provider, uint128 oldFee, uint128 newFee);

    event ProviderUriUpdated(address provider, bytes oldUri, bytes newUri);

    event ProviderFeeManagerUpdated(
        address provider,
        address oldFeeManager,
        address newFeeManager
    );

    event Withdrawal(
        address provider,
        address recipient,
        uint128 withdrawnAmount
    );
}

// SPDX-License-Identifier: Apache 2

pragma solidity ^0.8.0;

contract EntropyStructs {
    struct ProviderInfo {
        uint128 feeInWei;
        uint128 accruedFeesInWei;
        // The commitment that the provider posted to the blockchain, and the sequence number
        // where they committed to this. This value is not advanced after the provider commits,
        // and instead is stored to help providers track where they are in the hash chain.
        bytes32 originalCommitment;
        uint64 originalCommitmentSequenceNumber;
        // Metadata for the current commitment. Providers may optionally use this field to help
        // manage rotations (i.e., to pick the sequence number from the correct hash chain).
        bytes commitmentMetadata;
        // Optional URI where clients can retrieve revelations for the provider.
        // Client SDKs can use this field to automatically determine how to retrieve random values for each provider.
        // TODO: specify the API that must be implemented at this URI
        bytes uri;
        // The first sequence number that is *not* included in the current commitment (i.e., an exclusive end index).
        // The contract maintains the invariant that sequenceNumber <= endSequenceNumber.
        // If sequenceNumber == endSequenceNumber, the provider must rotate their commitment to add additional random values.
        uint64 endSequenceNumber;
        // The sequence number that will be assigned to the next inbound user request.
        uint64 sequenceNumber;
        // The current commitment represents an index/value in the provider's hash chain.
        // These values are used to verify requests for future sequence numbers. Note that
        // currentCommitmentSequenceNumber < sequenceNumber.
        //
        // The currentCommitment advances forward through the provider's hash chain as values
        // are revealed on-chain.
        bytes32 currentCommitment;
        uint64 currentCommitmentSequenceNumber;
        // An address that is authorized to set / withdraw fees on behalf of this provider.
        address feeManager;
    }

    struct Request {
        // Storage slot 1 //
        address provider;
        uint64 sequenceNumber;
        // The number of hashes required to verify the provider revelation.
        uint32 numHashes;
        // Storage slot 2 //
        // The commitment is keccak256(userCommitment, providerCommitment). Storing the hash instead of both saves 20k gas by
        // eliminating 1 store.
        bytes32 commitment;
        // Storage slot 3 //
        // The number of the block where this request was created.
        // Note that we're using a uint64 such that we have an additional space for an address and other fields in
        // this storage slot. Although block.number returns a uint256, 64 bits should be plenty to index all of the
        // blocks ever generated.
        uint64 blockNumber;
        // The address that requested this random number.
        address requester;
        // If true, incorporate the blockhash of blockNumber into the generated random value.
        bool useBlockhash;
        // If true, the requester will be called back with the generated random value.
        bool isRequestWithCallback;
        // There are 2 remaining bytes of free space in this slot.
    }
}

{
  "remappings": [
    "@pythnetwork/entropy-sdk-solidity/=node_modules/@pythnetwork/entropy-sdk-solidity/",
    "forge-std/=lib/forge-std/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": false,
  "libraries": {}
}

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[{"inputs":[],"name":"InvalidAmount","type":"error"},{"inputs":[],"name":"NoMatchAvailable","type":"error"},{"inputs":[],"name":"TransferFailed","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"player","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"BetCancelled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"player1","type":"address"},{"indexed":true,"internalType":"address","name":"player2","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"BetMatched","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"player","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"BetPlaced","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"winner","type":"address"},{"indexed":true,"internalType":"address","name":"loser","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"BetResolved","type":"event"},{"inputs":[{"internalType":"uint64","name":"sequence","type":"uint64"},{"internalType":"address","name":"provider","type":"address"},{"internalType":"bytes32","name":"randomNumber","type":"bytes32"}],"name":"_entropyCallback","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"cancelBet","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"entropy","outputs":[{"internalType":"contract IEntropy","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"matchedBets","outputs":[{"internalType":"address","name":"player1","type":"address"},{"internalType":"uint96","name":"requestFee","type":"uint96"},{"internalType":"address","name":"player2","type":"address"},{"internalType":"uint96","name":"amount","type":"uint96"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"pendingBets","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"provider","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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