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// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";

contract XFTAssetSwaps is ReentrancyGuard {
    struct Swap {
        address initiator;
        address participant;
        IERC20 initiatorAsset;
        IERC20 participantAsset;
        uint256 initiatorAmount;
        uint256 participantAmount;
        bytes32 hashlock;
        uint256 timelock;
        bool initiatorDeposited;
        bool participantDeposited;
        bool completed;
        bool refunded;
    }

    mapping(bytes32 => Swap) public swaps;

    event SwapInitiated(
        bytes32 indexed swapId,
        address indexed initiator,
        address indexed participant,
        address initiatorAsset,
        uint256 initiatorAmount,
        bytes32 hashlock,
        uint256 timelock
    );
    event SwapParticipated(
        bytes32 indexed swapId,
        address indexed participant,
        address participantAsset,
        uint256 participantAmount
    );
    event SwapCompleted(
        bytes32 indexed swapId,
        bytes32 preimage
    );
    event SwapRefunded(
        bytes32 indexed swapId,
        address indexed refunder
    );

    modifier swapExists(bytes32 _swapId) {
        require(swaps[_swapId].initiator != address(0), "Swap does not exist");
        _;
    }

    modifier onlyInitiator(bytes32 _swapId) {
        require(msg.sender == swaps[_swapId].initiator, "Only initiator allowed");
        _;
    }

    modifier onlyParticipant(bytes32 _swapId) {
        require(msg.sender == swaps[_swapId].participant, "Only participant allowed");
        _;
    }

    function initiateSwap(
        bytes32 _swapId,
        address _participant,
        IERC20 _initiatorAsset,
        IERC20 _participantAsset,
        uint256 _initiatorAmount,
        uint256 _participantAmount,
        bytes32 _hashlock,
        uint256 _timelock
    ) external nonReentrant {
        require(swaps[_swapId].initiator == address(0), "Swap exists");
        require(_participant != address(0), "Invalid participant");
        require(_participant != msg.sender, "Self swap not allowed");
        require(_initiatorAmount > 0 && _participantAmount > 0, "Invalid amounts");
        require(_timelock > block.timestamp, "Timelock must be future");
        require(_hashlock != bytes32(0), "Invalid hashlock");

        swaps[_swapId] = Swap({
            initiator: msg.sender,
            participant: _participant,
            initiatorAsset: _initiatorAsset,
            participantAsset: _participantAsset,
            initiatorAmount: _initiatorAmount,
            participantAmount: _participantAmount,
            hashlock: _hashlock,
            timelock: _timelock,
            initiatorDeposited: false,
            participantDeposited: false,
            completed: false,
            refunded: false
        });

        require(
            _initiatorAsset.transferFrom(msg.sender, address(this), _initiatorAmount),
            "Initiator transfer failed"
        );
        swaps[_swapId].initiatorDeposited = true;

        emit SwapInitiated(
            _swapId,
            msg.sender,
            _participant,
            address(_initiatorAsset),
            _initiatorAmount,
            _hashlock,
            _timelock
        );
    }

    function participateSwap(bytes32 _swapId)
        external
        nonReentrant
        swapExists(_swapId)
        onlyParticipant(_swapId)
    {
        Swap storage swap = swaps[_swapId];
        require(!swap.participantDeposited, "Already participated");
        require(!swap.completed, "Swap completed");
        require(!swap.refunded, "Swap refunded");
        require(block.timestamp < swap.timelock, "Swap expired");

        require(
            swap.participantAsset.transferFrom(msg.sender, address(this), swap.participantAmount),
            "Participant transfer failed"
        );
        swap.participantDeposited = true;

        emit SwapParticipated(
            _swapId,
            msg.sender,
            address(swap.participantAsset),
            swap.participantAmount
        );
    }

    function claimSwap(bytes32 _swapId, bytes32 _preimage)
        external
        nonReentrant
        swapExists(_swapId)
    {
        Swap storage swap = swaps[_swapId];
        require(!swap.completed, "Swap completed");
        require(!swap.refunded, "Swap refunded");
        require(swap.initiatorDeposited && swap.participantDeposited, "Deposit missing");
        require(block.timestamp < swap.timelock, "Swap expired");
        require(sha256(abi.encodePacked(_preimage)) == swap.hashlock, "Bad preimage");

        swap.completed = true;

        require(
            swap.participantAsset.transfer(swap.initiator, swap.participantAmount),
            "To initiator failed"
        );
        require(
            swap.initiatorAsset.transfer(swap.participant, swap.initiatorAmount),
            "To participant failed"
        );

        emit SwapCompleted(_swapId, _preimage);
    }

    function refundSwap(bytes32 _swapId)
        external
        nonReentrant
        swapExists(_swapId)
    {
        Swap storage swap = swaps[_swapId];
        require(!swap.completed, "Swap completed");
        require(!swap.refunded, "Swap refunded");
        require(block.timestamp >= swap.timelock, "Too early");
        require(
            msg.sender == swap.initiator || msg.sender == swap.participant,
            "Not swap party"
        );

        swap.refunded = true;

        if (swap.initiatorDeposited) {
            require(
                swap.initiatorAsset.transfer(swap.initiator, swap.initiatorAmount),
                "Refund initiator failed"
            );
        }
        if (swap.participantDeposited) {
            require(
                swap.participantAsset.transfer(swap.participant, swap.participantAmount),
                "Refund participant failed"
            );
        }

        emit SwapRefunded(_swapId, msg.sender);
    }

    function getSwap(bytes32 _swapId)
        external
        view
        returns (
            address initiator,
            address participant,
            address initiatorAsset,
            address participantAsset,
            uint256 initiatorAmount,
            uint256 participantAmount,
            bytes32 hashlock,
            uint256 timelock,
            bool initiatorDeposited,
            bool participantDeposited,
            bool completed,
            bool refunded
        )
    {
        Swap storage swap = swaps[_swapId];
        return (
            swap.initiator,
            swap.participant,
            address(swap.initiatorAsset),
            address(swap.participantAsset),
            swap.initiatorAmount,
            swap.participantAmount,
            swap.hashlock,
            swap.timelock,
            swap.initiatorDeposited,
            swap.participantDeposited,
            swap.completed,
            swap.refunded
        );
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

// 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);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"swapId","type":"bytes32"},{"indexed":false,"internalType":"bytes32","name":"preimage","type":"bytes32"}],"name":"SwapCompleted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"swapId","type":"bytes32"},{"indexed":true,"internalType":"address","name":"initiator","type":"address"},{"indexed":true,"internalType":"address","name":"participant","type":"address"},{"indexed":false,"internalType":"address","name":"initiatorAsset","type":"address"},{"indexed":false,"internalType":"uint256","name":"initiatorAmount","type":"uint256"},{"indexed":false,"internalType":"bytes32","name":"hashlock","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"timelock","type":"uint256"}],"name":"SwapInitiated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"swapId","type":"bytes32"},{"indexed":true,"internalType":"address","name":"participant","type":"address"},{"indexed":false,"internalType":"address","name":"participantAsset","type":"address"},{"indexed":false,"internalType":"uint256","name":"participantAmount","type":"uint256"}],"name":"SwapParticipated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"swapId","type":"bytes32"},{"indexed":true,"internalType":"address","name":"refunder","type":"address"}],"name":"SwapRefunded","type":"event"},{"inputs":[{"internalType":"bytes32","name":"_swapId","type":"bytes32"},{"internalType":"bytes32","name":"_preimage","type":"bytes32"}],"name":"claimSwap","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_swapId","type":"bytes32"}],"name":"getSwap","outputs":[{"internalType":"address","name":"initiator","type":"address"},{"internalType":"address","name":"participant","type":"address"},{"internalType":"address","name":"initiatorAsset","type":"address"},{"internalType":"address","name":"participantAsset","type":"address"},{"internalType":"uint256","name":"initiatorAmount","type":"uint256"},{"internalType":"uint256","name":"participantAmount","type":"uint256"},{"internalType":"bytes32","name":"hashlock","type":"bytes32"},{"internalType":"uint256","name":"timelock","type":"uint256"},{"internalType":"bool","name":"initiatorDeposited","type":"bool"},{"internalType":"bool","name":"participantDeposited","type":"bool"},{"internalType":"bool","name":"completed","type":"bool"},{"internalType":"bool","name":"refunded","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_swapId","type":"bytes32"},{"internalType":"address","name":"_participant","type":"address"},{"internalType":"contract IERC20","name":"_initiatorAsset","type":"address"},{"internalType":"contract IERC20","name":"_participantAsset","type":"address"},{"internalType":"uint256","name":"_initiatorAmount","type":"uint256"},{"internalType":"uint256","name":"_participantAmount","type":"uint256"},{"internalType":"bytes32","name":"_hashlock","type":"bytes32"},{"internalType":"uint256","name":"_timelock","type":"uint256"}],"name":"initiateSwap","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_swapId","type":"bytes32"}],"name":"participateSwap","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_swapId","type":"bytes32"}],"name":"refundSwap","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"swaps","outputs":[{"internalType":"address","name":"initiator","type":"address"},{"internalType":"address","name":"participant","type":"address"},{"internalType":"contract IERC20","name":"initiatorAsset","type":"address"},{"internalType":"contract IERC20","name":"participantAsset","type":"address"},{"internalType":"uint256","name":"initiatorAmount","type":"uint256"},{"internalType":"uint256","name":"participantAmount","type":"uint256"},{"internalType":"bytes32","name":"hashlock","type":"bytes32"},{"internalType":"uint256","name":"timelock","type":"uint256"},{"internalType":"bool","name":"initiatorDeposited","type":"bool"},{"internalType":"bool","name":"participantDeposited","type":"bool"},{"internalType":"bool","name":"completed","type":"bool"},{"internalType":"bool","name":"refunded","type":"bool"}],"stateMutability":"view","type":"function"}]

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