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// SPDX-License-Identifier: MIT

pragma solidity 0.8.20;

import "@openzeppelin/contracts/proxy/utils/UUPSUpgradeable.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@mapprotocol/protocol/contracts/interface/ILightNode.sol";
import "@mapprotocol/protocol/contracts/utils/Utils.sol";
import "./interface/IWrappedToken.sol";
import "./interface/IMintableToken.sol";
import "./interface/IButterReceiver.sol";
import "./interface/IButterMosV2.sol";
import "./utils/EvmDecoder.sol";

contract MAPOmnichainServiceV2 is ReentrancyGuard, Initializable, Pausable, IButterMosV2, UUPSUpgradeable {
    using Address for address;

    uint256 public immutable selfChainId = block.chainid;
    uint256 public nonce;
    address public wToken; // native wrapped token
    address public relayContract;
    uint256 public relayChainId;
    ILightNode public lightNode;

    mapping(bytes32 => bool) public orderList;
    mapping(address => bool) public mintableTokens;
    mapping(uint256 => mapping(address => bool)) public tokenMappingList;
    address public butterRouter;

    // reserved
    IEvent.swapOutEvent[] private verifiedLogs;
    mapping(bytes32 => bool) public storedOrderId; // log hash

    event SetButterRouter(address butterRouter);
    event SetLightClient(address lightNode);
    event SetWrappedToken(address wToken);
    event UpdateMintableToken(address token, bool mintable);

    event SetRelayContract(uint256 chainId, address relay);
    event RegisterToken(address token, uint256 toChain, bool enable);
    // event mapSwapExecute(uint256 indexed fromChain, uint256 indexed toChain, address indexed from);
    event mapSwapInVerified(bytes logs);

    function initialize(
        address _wToken,
        address _lightNode,
        address _owner
    ) public initializer checkAddress(_wToken) checkAddress(_lightNode) checkAddress(_owner) {
        wToken = _wToken;
        emit SetWrappedToken(_wToken);
        lightNode = ILightNode(_lightNode);
        emit SetLightClient(_lightNode);
        _changeAdmin(_owner);
    }

    receive() external payable {}

    modifier checkOrder(bytes32 _orderId) {
        require(!orderList[_orderId], "order exist");
        orderList[_orderId] = true;
        _;
    }

    modifier checkBridgeable(address _token, uint256 _chainId) {
        require(tokenMappingList[_chainId][_token], "token not registered");
        _;
    }

    modifier checkAddress(address _address) {
        require(_address != address(0), "address is zero");
        _;
    }

    modifier onlyOwner() {
        require(msg.sender == _getAdmin(), "mos :: only admin");
        _;
    }

    function setPause() external onlyOwner {
        _pause();
    }

    function setUnpause() external onlyOwner {
        _unpause();
    }

    function setLightClient(address _lightNode) external onlyOwner checkAddress(_lightNode) {
        lightNode = ILightNode(_lightNode);
        emit SetLightClient(_lightNode);
    }

    /*
    function setWrappedToken(address _wToken) external onlyOwner {
        wToken = _wToken;
        emit SetWrappedToken(_wToken);
    }
    */

    function setButterRouter(address _butterRouter) external onlyOwner {
        butterRouter = _butterRouter;
        emit SetButterRouter(_butterRouter);
    }

    function updateMintableToken(address[] memory _tokens, bool _mintable) external onlyOwner {
        for (uint256 i = 0; i < _tokens.length; i++) {
            mintableTokens[_tokens[i]] = _mintable;
            emit UpdateMintableToken(_tokens[i], _mintable);
        }
    }

    function setRelayContract(uint256 _chainId, address _relay) external onlyOwner checkAddress(_relay) {
        relayContract = _relay;
        relayChainId = _chainId;

        emit SetRelayContract(_chainId, _relay);
    }

    function registerTokenChains(address _token, uint256[] memory _toChains, bool _enable) external onlyOwner {
        require(_token.isContract(), "token is not contract");
        for (uint256 i = 0; i < _toChains.length; i++) {
            uint256 toChain = _toChains[i];
            tokenMappingList[toChain][_token] = _enable;
            emit RegisterToken(_token, toChain, _enable);
        }
    }

    /*
    function withdraw(address _token, address payable _receiver,uint256 _amount) external onlyOwner {
        _transfer(_token, _receiver, _amount);
    }
    */

    // ------------------------------------------

    function swapOutToken(
        address _initiator, // swap initiator address
        address _token, // src token
        bytes memory _to,
        uint256 _amount,
        uint256 _toChain, // target chain id
        bytes calldata _swapData
    ) external payable virtual override nonReentrant whenNotPaused returns (bytes32 orderId) {
        require(_amount > 0, "Sending value is zero");
        address token = _token;
        if (token == address(0)) {
            token = wToken;
            require(msg.value >= _amount, "Invalid msg value");
            IWrappedToken(token).deposit{value: _amount}();
        } else {
            SafeERC20.safeTransferFrom(IERC20(token), msg.sender, address(this), _amount);
            if (isMintable(token)) {
                IMintableToken(token).burn(_amount);
            }
        }

        orderId = _swapOut(token, _to, _initiator, _amount, _toChain, _swapData);
    }

    function depositToken(address _token, address _to, uint256 _amount) external payable override whenNotPaused {
        require(_amount > 0, "Sending value is zero");
        address from = msg.sender;
        address token = _token;
        if (token == address(0)) {
            token = wToken;
            require(msg.value >= _amount, "Invalid msg value");
            IWrappedToken(token).deposit{value: _amount}();
        } else {
            SafeERC20.safeTransferFrom(IERC20(token), from, address(this), _amount);
            if (isMintable(token)) {
                IMintableToken(token).burn(_amount);
            }
        }
        _deposit(token, from, _to, _amount, selfChainId, relayChainId);
    }

    function swapIn(
        uint256 _chainId,
        uint256 _logIndex,
        bytes32 _orderId,
        bytes memory _receiptProof
    ) external nonReentrant whenNotPaused {
        require(!orderList[_orderId], "order exist");
        require(_chainId == relayChainId, "invalid chain id");
        (bool success, string memory message, bytes memory logArray) = lightNode.verifyProofDataWithCache(
            _receiptProof
        );
        require(success, message);
        _swapInVerifiedWithIndex(logArray, _logIndex);
        // emit mapSwapExecute(_chainId, selfChainId, msg.sender);
    }

    /*
    // verify swap in logs and store hash
    function swapInVerify(uint256 _chainId, uint256 _logIndex,
        bytes32 _orderId, bytes memory _receiptProof) external nonReentrant whenNotPaused {
        require(!orderList[_orderId], "order exist");
        require(_chainId == relayChainId, "invalid chain id");
        (bool success, string memory message, bytes memory logArray) = lightNode.verifyProofDataWithCache(
            _receiptProof
        );
        require(success, message);
        bytes32 hash = keccak256(logArray);
        require(!storedOrderId[hash], "already verified");
        storedOrderId[hash] = true;
        emit mapSwapInVerified(logArray);
    }

    // execute stored swap in logs
    function swapInVerified(bytes calldata _logArray, uint256 _logIndex, bytes32 _orderId) external nonReentrant whenNotPaused {
        require(!orderList[_orderId], "order exist");
        bytes32 hash = keccak256(_logArray);
        require(storedOrderId[hash], "not verified");
        _swapInVerifiedWithIndex(_logArray, _logIndex);
    }
    */

    function isMintable(address _token) public view returns (bool) {
        return mintableTokens[_token];
    }

    function isBridgeable(address _token, uint256 _toChain) public view returns (bool) {
        return tokenMappingList[_toChain][_token];
    }

    function getOrderStatus(
        uint256,
        uint256 _blockNum,
        bytes32 _orderId
    ) external view override returns (bool exists, bool verifiable, uint256 nodeType) {
        exists = orderList[_orderId];
        verifiable = lightNode.isVerifiable(_blockNum, bytes32(""));
        nodeType = lightNode.nodeType();
    }

    function _getOrderID(address _from, bytes memory _to, uint256 _fromChain, uint256 _toChain) internal returns (bytes32) {
        return keccak256(abi.encodePacked(address(this), nonce++, _fromChain, _toChain, _from, _to));
    }

    function _swapInVerifiedWithIndex(bytes memory logArray, uint256 logIndex) private {
        IEvent.txLog memory log = EvmDecoder.decodeTxLog(logArray, logIndex);
        // bytes32 topic = abi.decode(log.topics[0], (bytes32));

        require(relayContract == log.addr, "Invalid relay contract");
        require(log.topics[0] == EvmDecoder.MAP_SWAPOUT_TOPIC, "Invalid relay topic");

        IEvent.swapOutEvent memory outEvent = EvmDecoder.decodeSwapOutLog(log);
        // there might be more than one events to multi-chains
        // only process the event for this chain
        require(selfChainId == outEvent.toChain, "Invalid to chain id");
        _swapIn(outEvent);
    }

    function _swapIn(IEvent.swapOutEvent memory _outEvent) internal checkOrder(_outEvent.orderId) {
        address tokenIn = Utils.fromBytes(_outEvent.token);
        // receiving address
        address payable toAddress = payable(Utils.fromBytes(_outEvent.to));
        // amount of token need to be sent
        uint256 actualAmountIn = _outEvent.amount;

        if (isMintable(tokenIn)) {
            IMintableToken(tokenIn).mint(address(this), actualAmountIn);
        }

        // if swap params is not empty, then we need to do swap on current chain
        if (_outEvent.swapData.length > 0 && address(toAddress).isContract()) {
            _transfer(_outEvent.toChain, tokenIn, toAddress, actualAmountIn);
            try
                IButterReceiver(toAddress).onReceived(
                    _outEvent.orderId,
                    tokenIn,
                    actualAmountIn,
                    _outEvent.fromChain,
                    _outEvent.from,
                    _outEvent.swapData
                )
            {
                // do nothing
            } catch {
                // do nothing
            }
        } else {
            // transfer token if swap did not happen
            if (tokenIn == wToken) {
                IWrappedToken(tokenIn).withdraw(actualAmountIn);
                Address.sendValue(payable(toAddress), actualAmountIn);
            } else {
                _transfer(_outEvent.toChain, tokenIn, toAddress, actualAmountIn);
            }
        }
        emit mapSwapIn(
            _outEvent.fromChain,
            _outEvent.toChain,
            _outEvent.orderId,
            tokenIn,
            _outEvent.from,
            toAddress,
            actualAmountIn
        );
    }

    function _transfer(uint256 _chainId, address _token, address _to, uint256 _amount) internal {
        if (_token == address(0)) {
            Address.sendValue(payable(_to), _amount);
        } else {
            if (_chainId == 728126428 && _token == 0xa614f803B6FD780986A42c78Ec9c7f77e6DeD13C) {
                // Tron USDT
                _token.call(abi.encodeWithSelector(0xa9059cbb, _to, _amount));
            } else {
                SafeERC20.safeTransfer(IERC20(_token), _to, _amount);
            }
        }
    }

    function _swapOut(
        address _token, // src token
        bytes memory _to,
        address _from,
        uint256 _amount,
        uint256 _toChain, // target chain id
        bytes calldata _swapData
    ) internal checkBridgeable(_token, _toChain) returns (bytes32 orderId) {
        uint256 fromChain = selfChainId;
        require(_toChain != fromChain, "Cannot swap to self chain");
        orderId = _getOrderID(msg.sender, _to, fromChain, _toChain);
        _from = (msg.sender == butterRouter) ? _from : msg.sender;
        _notifyLightClient(bytes(""));
        emit mapSwapOut(
            fromChain,
            _toChain,
            orderId,
            Utils.toBytes(_token),
            Utils.toBytes(_from),
            _to,
            _amount,
            _swapData
        );
    }

    function _deposit(address _token, address _from, address _to, uint256 _amount, uint256 _fromChain, uint256 _toChain) internal checkBridgeable(_token, _toChain) {
        bytes32 orderId = _getOrderID(_from, Utils.toBytes(_to), _fromChain, _toChain);
        _notifyLightClient(bytes(""));
        emit mapDepositOut(_fromChain, _toChain, orderId, _token, Utils.toBytes(_from), _to, _amount);
    }

    function _notifyLightClient(bytes memory _data) internal {
        lightNode.notifyLightClient(address(this), _data);
    }

    /** UUPS *********************************************************/
    function _authorizeUpgrade(address) internal view override {
        require(msg.sender == _getAdmin(), "MAPOmnichainService: only Admin can upgrade");
    }

    function changeAdmin(address _admin) external onlyOwner checkAddress(_admin) {
        _changeAdmin(_admin);
    }

    function getAdmin() external view returns (address) {
        return _getAdmin();
    }

    function getImplementation() external view returns (address) {
        return _getImplementation();
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface ILightNode {
    event UpdateBlockHeader(address indexed maintainer, uint256 indexed blockHeight);

    event ClientNotifySend(address indexed sender, uint256 indexed blockHeight, bytes notifyData);

    function updateBlockHeader(bytes memory _blockHeader) external;

    function updateLightClient(bytes memory _data) external;

    // @notice Notify light client to relay the block
    // @param _data - notify data, if no data set it to empty
    function notifyLightClient(address _from, bytes memory _data) external;

    // @notice Validate the receipt according to the block header and receipt merkel proof
    //         Using block header number and block receipt root cache to optimize the validation gas cost.
    // @param _receiptProof - the bytes to receipt proof
    // @return success - verification result
    // @return message - the result message
    // @return logs - the logs included in the receipt
    function verifyProofDataWithCache(
        bytes memory _receiptProof
    ) external returns (bool success, string memory message, bytes memory logs);

    // @notice Validate the receipt according to the block header and receipt merkel proof
    // @param _receiptProof - the bytes to receipt proof
    // @return success - verification result
    // @return message - the result message
    // @return logs - the logs included in the receipt
    function verifyProofData(
        bytes memory _receiptProof
    ) external view returns (bool success, string memory message, bytes memory logs);

    // Get client state
    function clientState() external view returns (bytes memory);

    function finalizedState(bytes memory _data) external view returns (bytes memory);

    // @notice Get the light client block height
    // @return height - current block height or slot number
    function headerHeight() external view returns (uint256 height);

    //
    function verifiableHeaderRange() external view returns (uint256, uint256);

    // @notice Check whether the block can be verified
    // @return
    function isVerifiable(uint256 _blockHeight, bytes32 _hash) external view returns (bool);

    // @notice Get the light client type
    // @return - 1 default light client
    //           2 zk light client
    //           3 oracle client
    function nodeType() external view returns (uint256);
}

// SPDX-License-Identifier: MIT

/*
 * @author Hamdi Allam [email protected]
 * Please reach out with any questions or concerns
 */
pragma solidity ^0.8.0;

library RLPReader {
    uint8 constant STRING_SHORT_START = 0x80;
    uint8 constant STRING_LONG_START = 0xb8;
    uint8 constant LIST_SHORT_START = 0xc0;
    uint8 constant LIST_LONG_START = 0xf8;
    uint8 constant WORD_SIZE = 32;

    struct RLPItem {
        uint256 len;
        uint256 memPtr;
    }

    struct Iterator {
        RLPItem item; // Item that's being iterated over.
        uint256 nextPtr; // Position of the next item in the list.
    }

    /*
     * @dev Returns the next element in the iteration. Reverts if it has not next element.
     * @param self The iterator.
     * @return The next element in the iteration.
     */
    function next(Iterator memory self) internal pure returns (RLPItem memory) {
        require(hasNext(self), "not have next");

        uint256 ptr = self.nextPtr;
        uint256 itemLength = _itemLength(ptr);
        self.nextPtr = ptr + itemLength;

        return RLPItem(itemLength, ptr);
    }

    /*
     * @dev Returns true if the iteration has more elements.
     * @param self The iterator.
     * @return true if the iteration has more elements.
     */
    function hasNext(Iterator memory self) internal pure returns (bool) {
        RLPItem memory item = self.item;
        return self.nextPtr < item.memPtr + item.len;
    }

    /*
     * @param item RLP encoded bytes
     */
    function toRlpItem(bytes memory item) internal pure returns (RLPItem memory) {
        uint256 memPtr;
        assembly {
            memPtr := add(item, 0x20)
        }

        return RLPItem(item.length, memPtr);
    }

    /*
     * @dev Create an iterator. Reverts if item is not a list.
     * @param self The RLP item.
     * @return An 'Iterator' over the item.
     */
    function iterator(RLPItem memory self) internal pure returns (Iterator memory) {
        require(isList(self), "check self list fail");

        uint256 ptr = self.memPtr + _payloadOffset(self.memPtr);
        return Iterator(self, ptr);
    }

    /*
     * @param the RLP item.
     */
    function rlpLen(RLPItem memory item) internal pure returns (uint256) {
        return item.len;
    }

    /*
     * @param the RLP item.
     * @return (memPtr, len) pair: location of the item's payload in memory.
     */
    function payloadLocation(RLPItem memory item) internal pure returns (uint256, uint256) {
        uint256 offset = _payloadOffset(item.memPtr);
        uint256 memPtr = item.memPtr + offset;
        uint256 len = item.len - offset;
        // data length
        return (memPtr, len);
    }

    /*
     * @param the RLP item.
     */
    function payloadLen(RLPItem memory item) internal pure returns (uint256) {
        (, uint256 len) = payloadLocation(item);
        return len;
    }

    /*
     * @param the RLP item containing the encoded list.
     */
    function toList(RLPItem memory item) internal pure returns (RLPItem[] memory) {
        require(isList(item), "is list fail");

        uint256 items = numItems(item);
        RLPItem[] memory result = new RLPItem[](items);

        uint256 memPtr = item.memPtr + _payloadOffset(item.memPtr);
        uint256 dataLen;
        for (uint256 i = 0; i < items; i++) {
            dataLen = _itemLength(memPtr);
            result[i] = RLPItem(dataLen, memPtr);
            memPtr = memPtr + dataLen;
        }

        return result;
    }

    /*
     * @param get the RLP item by index. save gas.
     */
    function getItemByIndex(RLPItem memory item, uint idx) internal pure returns (RLPItem memory) {
        require(isList(item), "is list fail");

        uint memPtr = item.memPtr + _payloadOffset(item.memPtr);
        uint dataLen;
        for (uint i = 0; i < idx; i++) {
            dataLen = _itemLength(memPtr);
            memPtr = memPtr + dataLen;
        }
        dataLen = _itemLength(memPtr);
        return RLPItem(dataLen, memPtr);
    }

    /*
     * @param get the RLP item by index. save gas.
     */
    function safeGetItemByIndex(RLPItem memory item, uint idx) internal pure returns (RLPItem memory) {
        require(isList(item), "is list fail");

        uint endPtr = item.memPtr + item.len;

        uint memPtr = item.memPtr + _payloadOffset(item.memPtr);
        uint dataLen;
        for (uint i = 0; i < idx; i++) {
            dataLen = _itemLength(memPtr);
            memPtr = memPtr + dataLen;
        }
        dataLen = _itemLength(memPtr);

        require(memPtr + dataLen <= endPtr, "RLP item overflow");
        return RLPItem(dataLen, memPtr);
    }

    // @return indicator whether encoded payload is a list. negate this function call for isData.
    function isList(RLPItem memory item) internal pure returns (bool) {
        if (item.len == 0) return false;

        uint8 byte0;
        uint256 memPtr = item.memPtr;
        assembly {
            byte0 := byte(0, mload(memPtr))
        }

        if (byte0 < LIST_SHORT_START) return false;
        return true;
    }

    /*
     * @dev A cheaper version of keccak256(toRlpBytes(item)) that avoids copying memory.
     * @return keccak256 hash of RLP encoded bytes.
     */
    function rlpBytesKeccak256(RLPItem memory item) internal pure returns (bytes32) {
        uint256 ptr = item.memPtr;
        uint256 len = item.len;
        bytes32 result;
        assembly {
            result := keccak256(ptr, len)
        }
        return result;
    }

    /*
     * @dev A cheaper version of keccak256(toBytes(item)) that avoids copying memory.
     * @return keccak256 hash of the item payload.
     */
    function payloadKeccak256(RLPItem memory item) internal pure returns (bytes32) {
        (uint256 memPtr, uint256 len) = payloadLocation(item);
        bytes32 result;
        assembly {
            result := keccak256(memPtr, len)
        }
        return result;
    }

    /** RLPItem conversions into data types **/

    // @returns raw rlp encoding in bytes
    function toRlpBytes(RLPItem memory item) internal pure returns (bytes memory) {
        bytes memory result = new bytes(item.len);
        if (result.length == 0) return result;

        uint256 ptr;
        assembly {
            ptr := add(0x20, result)
        }

        copy(item.memPtr, ptr, item.len);
        return result;
    }

    // any non-zero byte except "0x80" is considered true
    function toBoolean(RLPItem memory item) internal pure returns (bool) {
        require(item.len == 1, "item len is not one");
        uint256 result;
        uint256 memPtr = item.memPtr;
        assembly {
            result := byte(0, mload(memPtr))
        }

        // SEE Github Issue #5.
        // Summary: Most commonly used RLP libraries (i.e Geth) will encode
        // "0" as "0x80" instead of as "0". We handle this edge case explicitly
        // here.
        if (result == 0 || result == STRING_SHORT_START) {
            return false;
        } else {
            return true;
        }
    }

    function toAddress(RLPItem memory item) internal pure returns (address) {
        // 1 byte for the length prefix
        require(item.len == 21, "item len is not 21");

        return address(uint160(toUint(item)));
    }

    function toUint(RLPItem memory item) internal pure returns (uint256) {
        require(item.len > 0 && item.len <= 33, "item len is not uint");

        (uint256 memPtr, uint256 len) = payloadLocation(item);

        uint256 result;
        assembly {
            result := mload(memPtr)

            // shfit to the correct location if neccesary
            if lt(len, 32) {
                result := div(result, exp(256, sub(32, len)))
            }
        }

        return result;
    }

    // enforces 32 byte length
    function toUintStrict(RLPItem memory item) internal pure returns (uint256) {
        // one byte prefix
        require(item.len == 33, "item is not uint strict");

        uint256 result;
        uint256 memPtr = item.memPtr + 1;
        assembly {
            result := mload(memPtr)
        }

        return result;
    }

    function toBytes(RLPItem memory item) internal pure returns (bytes memory) {
        require(item.len > 0, "item len is zero");

        (uint256 memPtr, uint256 len) = payloadLocation(item);
        bytes memory result = new bytes(len);

        uint256 destPtr;
        assembly {
            destPtr := add(0x20, result)
        }

        copy(memPtr, destPtr, len);
        return result;
    }

    function toBytes32(RLPItem memory item) internal pure returns (bytes32) {
        // one byte prefix
        require(item.len == 33, "item is not bytes32");

        bytes32 result;
        uint256 memPtr = item.memPtr + 1;
        assembly {
            result := mload(memPtr)
        }

        return result;
    }

    /*
     * @dev A cheaper version of toRlpBytes(item) that avoids copying memory.
     *      This will destroy the original data.
     * @return RLP encoded bytes.
     */
    function unsafeToRlpBytes(RLPItem memory item) internal pure returns (bytes memory result) {
        if (item.len == 0) return result;

        uint256 len = item.len;
        uint256 memPtr = item.memPtr;

        assembly {
            result := sub(memPtr, 0x20)
            mstore(result, len)
        }
        return result;
    }

    /*
     * @dev A cheaper version of toBytes(item) that avoids copying memory.
     *      This will destroy the original data.
     * @return RLP encoded bytes.
     */
    function unsafeToBytes(RLPItem memory item) internal pure returns (bytes memory result) {
        if (item.len == 0) return result;

        (uint256 memPtr, uint256 len) = payloadLocation(item);
        assembly {
            result := sub(memPtr, 0x20)
            mstore(result, len)
        }
        return result;
    }

    /*
     * Private Helpers
     */

    // @return number of payload items inside an encoded list.
    function numItems(RLPItem memory item) internal pure returns (uint256) {
        if (item.len == 0) return 0;

        uint256 count = 0;
        uint256 currPtr = item.memPtr + _payloadOffset(item.memPtr);
        uint256 endPtr = item.memPtr + item.len;
        while (currPtr < endPtr) {
            currPtr = currPtr + _itemLength(currPtr);
            // skip over an item
            count++;
        }

        return count;
    }

    // @return entire rlp item byte length
    function _itemLength(uint256 memPtr) private pure returns (uint256) {
        uint256 itemLen;
        uint256 byte0;
        assembly {
            byte0 := byte(0, mload(memPtr))
        }

        if (byte0 < STRING_SHORT_START) itemLen = 1;
        else if (byte0 < STRING_LONG_START) itemLen = byte0 - STRING_SHORT_START + 1;
        else if (byte0 < LIST_SHORT_START) {
            assembly {
                let byteLen := sub(byte0, 0xb7) // # of bytes the actual length is
                memPtr := add(memPtr, 1) // skip over the first byte

                /* 32 byte word size */
                let dataLen := div(mload(memPtr), exp(256, sub(32, byteLen))) // right shifting to get the len
                itemLen := add(dataLen, add(byteLen, 1))
            }
        } else if (byte0 < LIST_LONG_START) {
            itemLen = byte0 - LIST_SHORT_START + 1;
        } else {
            assembly {
                let byteLen := sub(byte0, 0xf7)
                memPtr := add(memPtr, 1)

                let dataLen := div(mload(memPtr), exp(256, sub(32, byteLen))) // right shifting to the correct length
                itemLen := add(dataLen, add(byteLen, 1))
            }
        }

        return itemLen;
    }

    // @return number of bytes until the data
    function _payloadOffset(uint256 memPtr) private pure returns (uint256) {
        uint256 byte0;
        assembly {
            byte0 := byte(0, mload(memPtr))
        }

        if (byte0 < STRING_SHORT_START) return 0;
        else if (byte0 < STRING_LONG_START || (byte0 >= LIST_SHORT_START && byte0 < LIST_LONG_START)) return 1;
        else if (byte0 < LIST_SHORT_START)
            // being explicit
            return byte0 - (STRING_LONG_START - 1) + 1;
        else return byte0 - (LIST_LONG_START - 1) + 1;
    }

    /*
     * @param src Pointer to source
     * @param dest Pointer to destination
     * @param len Amount of memory to copy from the source
     */
    function copy(uint256 src, uint256 dest, uint256 len) private pure {
        if (len == 0) return;

        // copy as many word sizes as possible
        for (; len >= WORD_SIZE; len -= WORD_SIZE) {
            assembly {
                mstore(dest, mload(src))
            }

            src += WORD_SIZE;
            dest += WORD_SIZE;
        }

        if (len > 0) {
            // left over bytes. Mask is used to remove unwanted bytes from the word
            uint256 mask = 256 ** (WORD_SIZE - len) - 1;
            assembly {
                let srcpart := and(mload(src), not(mask)) // zero out src
                let destpart := and(mload(dest), mask) // retrieve the bytes
                mstore(dest, or(destpart, srcpart))
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

library Utils {
    uint256 constant MIN_NEAR_ADDRESS_LEN = 2;
    uint256 constant MAX_NEAR_ADDRESS_LEN = 64;

    function checkBytes(bytes memory b1, bytes memory b2) internal pure returns (bool) {
        return keccak256(b1) == keccak256(b2);
    }

    function fromBytes(bytes memory bys) internal pure returns (address addr) {
        assembly {
            addr := mload(add(bys, 20))
        }
    }

    function toBytes(address self) internal pure returns (bytes memory b) {
        b = abi.encodePacked(self);
    }

    function splitExtra(bytes memory extra) internal pure returns (bytes memory newExtra) {
        require(extra.length >= 64, "Invalid extra result type");
        newExtra = new bytes(64);
        for (uint256 i = 0; i < 64; i++) {
            newExtra[i] = extra[i];
        }
    }

    function hexStrToBytes(bytes memory _hexStr) internal pure returns (bytes memory) {
        //Check hex string is valid
        if (_hexStr.length % 2 != 0 || _hexStr.length < 4) {
            revert("hexStrToBytes: invalid input");
        }

        bytes memory bytes_array = new bytes(_hexStr.length / 2 - 32);

        for (uint256 i = 64; i < _hexStr.length; i += 2) {
            uint8 tetrad1 = 16;
            uint8 tetrad2 = 16;

            //left digit
            if (uint8(_hexStr[i]) >= 48 && uint8(_hexStr[i]) <= 57) tetrad1 = uint8(_hexStr[i]) - 48;

            //right digit
            if (uint8(_hexStr[i + 1]) >= 48 && uint8(_hexStr[i + 1]) <= 57) tetrad2 = uint8(_hexStr[i + 1]) - 48;

            //left A->F
            if (uint8(_hexStr[i]) >= 65 && uint8(_hexStr[i]) <= 70) tetrad1 = uint8(_hexStr[i]) - 65 + 10;

            //right A->F
            if (uint8(_hexStr[i + 1]) >= 65 && uint8(_hexStr[i + 1]) <= 70) tetrad2 = uint8(_hexStr[i + 1]) - 65 + 10;

            //left a->f
            if (uint8(_hexStr[i]) >= 97 && uint8(_hexStr[i]) <= 102) tetrad1 = uint8(_hexStr[i]) - 97 + 10;

            //right a->f
            if (uint8(_hexStr[i + 1]) >= 97 && uint8(_hexStr[i + 1]) <= 102) tetrad2 = uint8(_hexStr[i + 1]) - 97 + 10;

            //Check all symbols are allowed
            if (tetrad1 == 16 || tetrad2 == 16) revert("hexStrToBytes: invalid input");

            bytes_array[i / 2 - 32] = bytes1(16 * tetrad1 + tetrad2);
        }

        return bytes_array;
    }

    function isValidNearAddress(bytes memory _addr) internal pure returns (bool) {
        if (_addr.length < MIN_NEAR_ADDRESS_LEN || _addr.length > MAX_NEAR_ADDRESS_LEN) {
            return false;
        }
        bool last_char_is_separator = true;
        for (uint256 i = 0; i < _addr.length; i++) {
            uint8 char = uint8(_addr[i]);
            bool current_char_is_separator = false;

            //char 97-122 is a-z, 48-57 is 0-9 , 45 is - ,46 is .,95 is _
            if ((char >= 97 && char <= 122) || (char >= 48 && char <= 57) || (char == 45 || char == 46 || char == 95)) {
                if ((char == 45 || char == 46 || char == 95)) {
                    current_char_is_separator = true;
                }
            } else {
                return false;
            }

            if (current_char_is_separator && last_char_is_separator) {
                return false;
            }

            last_char_is_separator = current_char_is_separator;
        }
        return !last_char_is_separator;
    }

    function isValidEvmAddress(bytes memory _addr) internal pure returns (bool) {
        return _addr.length == 20;
    }

    function isValidAddress(bytes memory _addr, uint256 chainType) internal pure returns (bool) {
        if (chainType == 1) return isValidEvmAddress(_addr);
        if (chainType == 2) return isValidNearAddress(_addr);
        return false;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (interfaces/draft-IERC1822.sol)

pragma solidity ^0.8.0;

/**
 * @dev ERC1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
 * proxy whose upgrades are fully controlled by the current implementation.
 */
interface IERC1822Proxiable {
    /**
     * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
     * address.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy.
     */
    function proxiableUUID() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC1967.sol)

pragma solidity ^0.8.0;

/**
 * @dev ERC-1967: Proxy Storage Slots. This interface contains the events defined in the ERC.
 *
 * _Available since v4.8.3._
 */
interface IERC1967 {
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Emitted when the beacon is changed.
     */
    event BeaconUpgraded(address indexed beacon);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)

pragma solidity ^0.8.0;

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/ERC1967/ERC1967Upgrade.sol)

pragma solidity ^0.8.2;

import "../beacon/IBeacon.sol";
import "../../interfaces/IERC1967.sol";
import "../../interfaces/draft-IERC1822.sol";
import "../../utils/Address.sol";
import "../../utils/StorageSlot.sol";

/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 */
abstract contract ERC1967Upgrade is IERC1967 {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }

    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(address newImplementation, bytes memory data, bool forceCall) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
    }

    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallUUPS(address newImplementation, bytes memory data, bool forceCall) internal {
        // Upgrades from old implementations will perform a rollback test. This test requires the new
        // implementation to upgrade back to the old, non-ERC1822 compliant, implementation. Removing
        // this special case will break upgrade paths from old UUPS implementation to new ones.
        if (StorageSlot.getBooleanSlot(_ROLLBACK_SLOT).value) {
            _setImplementation(newImplementation);
        } else {
            try IERC1822Proxiable(newImplementation).proxiableUUID() returns (bytes32 slot) {
                require(slot == _IMPLEMENTATION_SLOT, "ERC1967Upgrade: unsupported proxiableUUID");
            } catch {
                revert("ERC1967Upgrade: new implementation is not UUPS");
            }
            _upgradeToAndCall(newImplementation, data, forceCall);
        }
    }

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }

    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;

    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
    }

    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(Address.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            Address.isContract(IBeacon(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }

    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(address newBeacon, bytes memory data, bool forceCall) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }
}

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

pragma solidity ^0.8.2;

import "../../utils/Address.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) || (!Address.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) (proxy/utils/UUPSUpgradeable.sol)

pragma solidity ^0.8.0;

import "../../interfaces/draft-IERC1822.sol";
import "../ERC1967/ERC1967Upgrade.sol";

/**
 * @dev An upgradeability mechanism designed for UUPS proxies. The functions included here can perform an upgrade of an
 * {ERC1967Proxy}, when this contract is set as the implementation behind such a proxy.
 *
 * A security mechanism ensures that an upgrade does not turn off upgradeability accidentally, although this risk is
 * reinstated if the upgrade retains upgradeability but removes the security mechanism, e.g. by replacing
 * `UUPSUpgradeable` with a custom implementation of upgrades.
 *
 * The {_authorizeUpgrade} function must be overridden to include access restriction to the upgrade mechanism.
 *
 * _Available since v4.1._
 */
abstract contract UUPSUpgradeable is IERC1822Proxiable, ERC1967Upgrade {
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable state-variable-assignment
    address private immutable __self = address(this);

    /**
     * @dev Check that the execution is being performed through a delegatecall call and that the execution context is
     * a proxy contract with an implementation (as defined in ERC1967) pointing to self. This should only be the case
     * for UUPS and transparent proxies that are using the current contract as their implementation. Execution of a
     * function through ERC1167 minimal proxies (clones) would not normally pass this test, but is not guaranteed to
     * fail.
     */
    modifier onlyProxy() {
        require(address(this) != __self, "Function must be called through delegatecall");
        require(_getImplementation() == __self, "Function must be called through active proxy");
        _;
    }

    /**
     * @dev Check that the execution is not being performed through a delegate call. This allows a function to be
     * callable on the implementing contract but not through proxies.
     */
    modifier notDelegated() {
        require(address(this) == __self, "UUPSUpgradeable: must not be called through delegatecall");
        _;
    }

    /**
     * @dev Implementation of the ERC1822 {proxiableUUID} function. This returns the storage slot used by the
     * implementation. It is used to validate the implementation's compatibility when performing an upgrade.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy. This is guaranteed by the `notDelegated` modifier.
     */
    function proxiableUUID() external view virtual override notDelegated returns (bytes32) {
        return _IMPLEMENTATION_SLOT;
    }

    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     *
     * @custom:oz-upgrades-unsafe-allow-reachable delegatecall
     */
    function upgradeTo(address newImplementation) public virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, new bytes(0), false);
    }

    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`, and subsequently execute the function call
     * encoded in `data`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     *
     * @custom:oz-upgrades-unsafe-allow-reachable delegatecall
     */
    function upgradeToAndCall(address newImplementation, bytes memory data) public payable virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, data, true);
    }

    /**
     * @dev Function that should revert when `msg.sender` is not authorized to upgrade the contract. Called by
     * {upgradeTo} and {upgradeToAndCall}.
     *
     * Normally, this function will use an xref:access.adoc[access control] modifier such as {Ownable-onlyOwner}.
     *
     * ```solidity
     * function _authorizeUpgrade(address) internal override onlyOwner {}
     * ```
     */
    function _authorizeUpgrade(address newImplementation) internal virtual;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// 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 v4.9.4) (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) (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 (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @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 Context {
    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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/StorageSlot.sol)
// This file was procedurally generated from scripts/generate/templates/StorageSlot.js.

pragma solidity ^0.8.0;

/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```solidity
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, `uint256`._
 * _Available since v4.9 for `string`, `bytes`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }

    struct BooleanSlot {
        bool value;
    }

    struct Bytes32Slot {
        bytes32 value;
    }

    struct Uint256Slot {
        uint256 value;
    }

    struct StringSlot {
        string value;
    }

    struct BytesSlot {
        bytes value;
    }

    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `StringSlot` with member `value` located at `slot`.
     */
    function getStringSlot(bytes32 slot) internal pure returns (StringSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `StringSlot` representation of the string storage pointer `store`.
     */
    function getStringSlot(string storage store) internal pure returns (StringSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }

    /**
     * @dev Returns an `BytesSlot` with member `value` located at `slot`.
     */
    function getBytesSlot(bytes32 slot) internal pure returns (BytesSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BytesSlot` representation of the bytes storage pointer `store`.
     */
    function getBytesSlot(bytes storage store) internal pure returns (BytesSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IButterMosV2 {
    function swapOutToken(
        address _sender,
        address _token, // src token
        bytes memory _to,
        uint256 _amount,
        uint256 _toChain, // target chain id
        bytes calldata _swapData
    ) external payable returns (bytes32 orderId);

    //function swapOutNative(
    //    address _sender,
    //    bytes memory _to,
    //    uint256 _toChain, // target chain id
    //    bytes calldata _swapData
    //) external payable returns (bytes32 orderId);

    function depositToken(address _token, address to, uint256 _amount) external payable;

    //function depositNative(address _to) external payable;

    function getOrderStatus(
        uint256 _chainId,
        uint256 _blockNum,
        bytes32 _orderId
    ) external view returns (bool exists, bool verifiable, uint256 nodeType);

    event mapTransferOut(
        uint256 indexed fromChain,
        uint256 indexed toChain,
        bytes32 orderId,
        bytes token,
        bytes from,
        bytes to,
        uint256 amount,
        bytes toChainToken
    );

    event mapDepositOut(
        uint256 indexed fromChain,
        uint256 indexed toChain,
        bytes32 orderId,
        address token,
        bytes from,
        address to,
        uint256 amount
    );

    event mapSwapOut(
        uint256 indexed fromChain, // from chain
        uint256 indexed toChain, // to chain
        bytes32 orderId, // order id
        bytes token, // token to transfer
        bytes from, // source chain from address
        bytes to,
        uint256 amount,
        bytes swapData // swap data, used on target chain dex.
    );

    event mapSwapIn(
        uint256 indexed fromChain,
        uint256 indexed toChain,
        bytes32 indexed orderId,
        address token,
        bytes from,
        address toAddress,
        uint256 amountOut
    );
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IButterReceiver {
    //_srcToken received token (wtoken or erc20 token)
    function onReceived(
        bytes32 _orderId,
        address _srcToken,
        uint256 _amount,
        uint256 _fromChain,
        bytes calldata _from,
        bytes calldata _payload
    ) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IEvent {
    struct depositOutEvent {
        bytes token;
        bytes from;
        bytes32 orderId;
        uint256 fromChain;
        uint256 toChain;
        bytes to;
        uint256 amount;
    }

    struct swapOutEvent {
        uint256 fromChain;
        uint256 toChain;
        bytes32 orderId;
        bytes token; // token to transfer
        bytes from;
        bytes to;
        uint256 amount;
        bytes swapData;
    }

    struct txLog {
        address addr;
        bytes32[] topics;
        bytes data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IMintableToken {
    function mint(address to, uint256 amount) external;

    function burn(uint256 amount) external;

    function burnFrom(address from, uint256 amount) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IWrappedToken {
    function deposit() external payable;

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

    function withdraw(uint256) external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.20;

import "@mapprotocol/protocol/contracts/utils/Utils.sol";
import "@mapprotocol/protocol/contracts/lib/RLPReader.sol";
import "../interface/IEvent.sol";

library EvmDecoder {
    using RLPReader for bytes;
    using RLPReader for RLPReader.RLPItem;

    bytes32 constant MAP_DEPOSITOUT_TOPIC =
        keccak256(bytes("mapDepositOut(uint256,uint256,bytes32,address,bytes,address,uint256)"));
    bytes32 constant MAP_SWAPOUT_TOPIC =
        keccak256(bytes("mapSwapOut(uint256,uint256,bytes32,bytes,bytes,bytes,uint256,bytes)"));

    function decodeTxLogs(bytes memory logsHash) internal pure returns (IEvent.txLog[] memory _txLogs) {
        RLPReader.RLPItem[] memory ls = logsHash.toRlpItem().toList();
        _txLogs = new IEvent.txLog[](ls.length);
        for (uint256 i = 0; i < ls.length; i++) {
            _txLogs[i] = _decodeTxLog(ls[i]);
        }
    }

    function decodeTxLog(bytes memory logsHash, uint256 logIndex) internal pure returns (IEvent.txLog memory _txLog) {
        RLPReader.RLPItem memory ls = logsHash.toRlpItem().safeGetItemByIndex(logIndex);
        _txLog = _decodeTxLog(ls);
    }

    function _decodeTxLog(RLPReader.RLPItem memory item) private pure returns (IEvent.txLog memory _txLog) {
        RLPReader.RLPItem[] memory items = item.toList();
        require(items.length >= 3, "log length to low");
        RLPReader.RLPItem[] memory firstItemList = items[1].toList();
        bytes32[] memory topic = new bytes32[](firstItemList.length);
        for (uint256 j = 0; j < firstItemList.length; j++) {
            topic[j] = firstItemList[j].toBytes32();
        }
        _txLog = IEvent.txLog({addr: items[0].toAddress(), topics: topic, data: items[2].unsafeToBytes()});
    }

    function decodeSwapOutLog(
        IEvent.txLog memory log
    ) internal pure returns (IEvent.swapOutEvent memory outEvent) {
        // executorId = Utils.toBytes(log.addr);
        //outEvent.fromChain = abi.decode(log.topics[1], (uint256));
        //outEvent.toChain = abi.decode(log.topics[2], (uint256));
        outEvent.fromChain = uint256(log.topics[1]);
        outEvent.toChain = uint256(log.topics[2]);

        (outEvent.orderId, outEvent.token, outEvent.from, outEvent.to, outEvent.amount, outEvent.swapData) = abi.decode(
            log.data,
            (bytes32, bytes, bytes, bytes, uint256, bytes)
        );
    }

    function decodeDepositOutLog(
        IEvent.txLog memory log
    ) internal pure returns (bytes memory executorId, IEvent.depositOutEvent memory depositEvent) {
        executorId = Utils.toBytes(log.addr);

        //depositEvent.fromChain = abi.decode(log.topics[1], (uint256));
        //depositEvent.toChain = abi.decode(log.topics[2], (uint256));
        depositEvent.fromChain = uint256(log.topics[1]);
        depositEvent.toChain = uint256(log.topics[2]);

        address token;
        address toAddress;
        (depositEvent.orderId, token, depositEvent.from, toAddress, depositEvent.amount) = abi.decode(
            log.data,
            (bytes32, address, bytes, address, uint256)
        );

        depositEvent.token = Utils.toBytes(token);
        depositEvent.to = Utils.toBytes(toAddress);
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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