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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {MessagingFee, Origin} from "@layerzerolabs/oapp-evm/contracts/oapp/OApp.sol";
import {TokenBridgeBase} from "./TokenBridgeBase.sol";
import {IWETH} from "./interfaces/IWETH.sol";
import {IMintableBurnable} from "./interfaces/IMintableBurnable.sol";
import {ChainId} from "./libraries/ChainId.sol";

/**
 * @title OriginalTokenBridge
 * @notice Bridge for ERC20, Bitcoin, BRC-20, and Runes
 * - Users can:
 *  # Bridge ERC20 <-> ERC20
 *  # Bridge ERC20 <-> BRC-20
 *  # Bridge ERC20 <-> Runes
 *  # Bridge Native ETH
 *  # BTC wrap / unwrap
 */
contract OriginalTokenBridge is TokenBridgeBase {
    using SafeERC20 for IERC20;

    /// @notice Tokens that can be bridged to the remote chain
    /// @dev [remote chain id] => [local token] => [bool]
    mapping(uint32 => mapping(address => bool)) public supportedTokens;

    /// @notice Tokens that can be bridged to BRC-20
    /// @dev [local token] => [remote tick]
    mapping(address => string) public localToBrc20;

    /// @notice Tokens that can be bridged from BRC-20
    /// @dev [remote tick] => [local token]
    mapping(string => address) public brc20ToLocal;

    /// @notice Tokens that can be bridged to Runes
    /// @dev [local token] => [remote tick]
    mapping(address => string) public localToRunes;

    /// @notice Tokens that can be bridged from Runes
    /// @dev [remote tick] => [local token]
    mapping(string => address) public runesToLocal;

    /// @notice Total value locked per each supported token
    /// @dev [remote chain id] => [local token] => [amount]
    mapping(uint32 => mapping(address => uint)) public tvls;

    /// @notice Total value locked to BRC-20
    /// @dev [local token] => [amount]
    mapping(address => uint) public brc20Tvls;

    /// @notice Total value locked to Runes
    /// @dev [local token] => [amount]
    mapping(address => uint) public runesTvls;

    /// @notice Whether the transaction id has been used before
    mapping(string => bool) public txIdUsed;

    /// @notice Address of the wrapped native gas token (e.g. WETH, WBNB, WMATIC)
    address public immutable WETH;

    /// @notice Address of the WrappedBTC
    address public immutable BBTC;

    /// @notice Fee charged
    uint256 public fee;

    event SendToken(
        address localToken,
        uint32 remoteChainId,
        address from,
        address to,
        uint amount,
        uint nativeFee,
        uint16 referralCode
    );
    event ReceiveToken(
        address localToken,
        uint32 remoteChainId,
        address to,
        uint amount,
        TokenType tokenType,
        string btcReceiver,
        uint16 referralCode
    );
    event RegisterToken(address localToken, uint32 remoteChainId);
    event FeeChanged(uint256 indexed oldFee, uint256 indexed newFee);

    // for BRC-20
    event RegisterBrc20Token(uint256 chainId, address localToken, string tick);
    event BridgeToBrc20(
        uint256 chainId,
        string tick,
        address localToken,
        address from,
        string to,
        uint amount,
        uint nativeFee,
        uint16 referralCode
    );
    event Brc20Received(
        uint256 chainId,
        string tick,
        uint32 remoteChainId,
        address localToken,
        address to,
        uint amount,
        string txId,
        uint16 referralCode
    );

    // for Runes
    event RegisterRunesToken(uint256 chainId, address localToken, string tick);
    event BridgeToRunes(
        uint256 chainId,
        string tick,
        address localToken,
        address from,
        string to,
        uint amount,
        uint nativeFee,
        uint16 referralCode
    );
    event RunesReceived(
        uint256 chainId,
        string tick,
        uint32 remoteChainId,
        address localToken,
        address to,
        uint amount,
        string txId,
        uint16 referralCode
    );
    event Brc20ToRunesTvlsUpdated(string brc20Tick, uint256 amount);

    event RunesToBrc20TvlsUpdated(string runesTick, uint256 amount);

    // for WrapBTC
    event WrapBTC(
        string txId,
        uint32 remoteChainId,
        address to,
        uint amount,
        uint16 referralCode
    );
    event UnwrapBTC(string btcReceiver, uint amount, uint16 referralCode);

    /**
     * @notice Constructor
     * @param _endpoint LayerZero endpoint
     * @param _delegate The delegate capable of making OApp configurations inside of the endpoint
     * @param _btcBridge the btc bridge address, multisig wallet
     * @param _superAdmin the super admin address
     * @param _btcDataFeed Chainlink BTC/USD price feed
     * @param _nativeDataFeed Chainlink Native/USD price feed
     * @param _nativeDecimals Decimals of the native currency
     */
    constructor(
        address _weth,
        address _bBTC,
        address _endpoint,
        address _delegate,
        address _btcBridge,
        address _superAdmin,
        address _btcDataFeed,
        address _nativeDataFeed,
        uint8 _nativeDecimals
    )
        TokenBridgeBase(
            _endpoint,
            _delegate,
            _btcBridge,
            _superAdmin,
            _btcDataFeed,
            _nativeDataFeed,
            _nativeDecimals
        )
    {
        if (_weth == address(0) || _bBTC == address(0)) {
            revert InvalidTokenAddress();
        }
        WETH = _weth;
        BBTC = _bBTC;
        fee = 0.03 ether;
    }

    // External functions

    /// @dev enable to receive Native currency
    receive() external payable {}

    /**
     * @notice Registers a token for bridging
     * @param localToken address of the local token
     * @param remoteChainId chain id of the remote chain
     */
    function registerToken(
        address localToken,
        uint32 remoteChainId
    ) external onlyOwner {
        if (localToken == address(0)) {
            revert InvalidTokenAddress();
        }
        if (supportedTokens[remoteChainId][localToken]) {
            revert TokenRegistered();
        }

        supportedTokens[remoteChainId][localToken] = true;
        protocolTokens[localToken] = true;
        emit RegisterToken(localToken, remoteChainId);
    }

    /**
     * @notice Registers a token for bridging to BRC-20
     * @param localToken address of the local token
     * @param tick identifier of the brc-20
     */
    function registerBrc20Token(
        address localToken,
        string memory tick
    ) external onlyOwner {
        if (localToken == address(0)) {
            revert InvalidTokenAddress();
        }
        if (bytes(tick).length == 0) {
            revert InvalidTick();
        }
        if (
            bytes(localToBrc20[localToken]).length > 0 ||
            brc20ToLocal[tick] != address(0)
        ) {
            revert TokenRegistered();
        }

        localToBrc20[localToken] = tick;
        brc20ToLocal[tick] = localToken;
        protocolTokens[localToken] = true;
        emit RegisterBrc20Token(ChainId.get(), localToken, tick);
    }

    /**
     * @notice Registers a token for bridging to Runes
     * @param localToken address of the local token
     * @param tick identifier of the Runes
     */
    function registerRunesToken(
        address localToken,
        string memory tick
    ) external onlyOwner {
        if (localToken == address(0)) {
            revert InvalidTokenAddress();
        }
        if (bytes(tick).length == 0) {
            revert InvalidTick();
        }
        if (
            bytes(localToRunes[localToken]).length > 0 ||
            runesToLocal[tick] != address(0)
        ) {
            revert TokenRegistered();
        }

        localToRunes[localToken] = tick;
        runesToLocal[tick] = localToken;
        protocolTokens[localToken] = true;
        emit RegisterRunesToken(ChainId.get(), localToken, tick);
    }

    /**
     * @notice Bridges ERC20 to the remote chain
     * Locks an ERC20 on the source chain and sends LZ message to the remote chain to mint a wrapped token
     * @param localToken address of local token
     * @param remoteChainId chain id of the remote chain
     * @param amount bridge amount
     * @param to the receiver address on the remote chain
     * @param referralCode referral code
     * @param refundAddress the refund address for the LayerZero native fee
     * @param options Additional options for message execution
     */
    function bridgeToErc20(
        address localToken,
        uint32 remoteChainId,
        uint amount,
        address to,
        uint16 referralCode,
        address payable refundAddress,
        bytes calldata options
    ) external payable whenNotPaused(localToken) nonReentrant {
        if (!supportedTokens[remoteChainId][localToken]) {
            revert UnsupportedToken();
        }

        if (amount == 0) {
            revert InvalidAmount();
        }

        // estimate LayerZero native fee
        (uint totalFee, uint nativeFee) = estimateErc20TotalFee(
            remoteChainId,
            options
        );
        if (msg.value < totalFee) {
            revert InsufficientFee();
        }

        if (refundAddress == address(0)) {
            revert InvalidRefundAddress();
        }

        // transfer token to contract
        IERC20(localToken).safeTransferFrom(
            _msgSender(),
            address(this),
            amount
        );

        _bridgeToErc20(
            localToken,
            remoteChainId,
            amount,
            to,
            nativeFee,
            referralCode,
            refundAddress,
            options
        );
    }

    /**
     * @notice Bridges native gas token (e.g. ETH) to the remote chain
     * @dev Locks WETH on the source chain and sends LZ message to the remote chain to mint a wrapped token
     * @param remoteChainId chain id of the remote chain
     * @param amount bridge amount
     * @param to the receiver address on the remote chain
     * @param referralCode referral code
     * @param refundAddress the refund address for the LayerZero native fee
     * @param options additional options for message execution
     */
    function bridgeNativeToErc20(
        uint32 remoteChainId,
        uint amount,
        address to,
        uint16 referralCode,
        address payable refundAddress,
        bytes calldata options
    ) external payable whenNotPaused(WETH) nonReentrant {
        if (!supportedTokens[remoteChainId][WETH]) {
            revert UnsupportedToken();
        }
        if (amount == 0) {
            revert InvalidAmount();
        }
        if (refundAddress == address(0)) {
            revert InvalidRefundAddress();
        }

        // estimate erc20 total fee
        (uint totalFee, uint nativeFee) = estimateErc20TotalFee(
            remoteChainId,
            options
        );
        if (msg.value < totalFee + amount) {
            revert InsufficientValueSent();
        }

        // Deposit ether to get wrapped ether, lock WETH in contract
        IWETH(WETH).deposit{value: amount}();

        _bridgeToErc20(
            WETH,
            remoteChainId,
            amount,
            to,
            nativeFee,
            referralCode,
            refundAddress,
            options
        );
    }

    /**
     * @notice Bridges ERC20 to BRC-20
     * On the EVM side, lock the user's ERC-20, and then transfer the brc-20 to the user on the Bitcoin side
     * @param localToken address of the local token
     * @param amount bridge amount
     * @param to the receiver address on the Bitcoin side
     * @param referralCode referral code
     */
    function bridgeToBrc20(
        address localToken,
        uint amount,
        string memory to,
        uint16 referralCode
    ) external payable whenNotPaused(localToken) nonReentrant {
        string memory tick = localToBrc20[localToken];
        if (bytes(tick).length == 0) {
            revert UnsupportedToken();
        }

        if (amount == 0) {
            revert InvalidAmount();
        }

        if (msg.value < estimateBrc20TotalFee()) {
            revert InsufficientFee();
        }

        // transfer token to contract
        IERC20(localToken).safeTransferFrom(
            _msgSender(),
            address(this),
            amount
        );

        _bridgeToBrc20(tick, localToken, amount, to, msg.value, referralCode);
    }

    /**
     * @notice Bridges native ETH to BRC-20
     * On the EVM side, lock the user's ERC-20, and then transfer the brc-20 to the user on the Bitcoin side
     * @param amount bridge amount
     * @param to the receiver address on the Bitcoin side
     * @param referralCode referral code
     */
    function bridgeNativeToBrc20(
        uint amount,
        string memory to,
        uint16 referralCode
    ) external payable whenNotPaused(WETH) nonReentrant {
        string memory tick = localToBrc20[WETH];
        if (bytes(tick).length == 0) {
            revert UnsupportedToken();
        }

        if (amount == 0) {
            revert InvalidAmount();
        }

        uint totalFee = estimateBrc20TotalFee();
        if (msg.value < amount + totalFee) {
            revert InsufficientValueSent();
        }

        // Deposit ether to get wrapped ether, lock WETH in contract
        IWETH(WETH).deposit{value: amount}();

        _bridgeToBrc20(tick, WETH, amount, to, amount, referralCode);
    }

    /**
     * @notice Bridges ERC20 to Runes
     * On the EVM side, lock the user's ERC-20, and then transfer the Runes to the user on the Bitcoin side
     * @param localToken address of the local token
     * @param amount bridge amount
     * @param to the receiver address on the Bitcoin side
     * @param referralCode referral code
     */
    function bridgeToRunes(
        address localToken,
        uint amount,
        string memory to,
        uint16 referralCode
    ) external payable whenNotPaused(localToken) nonReentrant {
        string memory tick = localToRunes[localToken];
        if (bytes(tick).length == 0) {
            revert UnsupportedToken();
        }

        if (amount == 0) {
            revert InvalidAmount();
        }

        if (msg.value < estimateRunesTotalFee()) {
            revert InsufficientFee();
        }

        // transfer token to contract
        IERC20(localToken).safeTransferFrom(
            _msgSender(),
            address(this),
            amount
        );

        _bridgeToRunes(tick, localToken, amount, to, msg.value, referralCode);
    }

    /**
     * @notice Bridges native ETH to Runes
     * On the EVM side, lock the user's ERC-20, and then transfer the Runes to the user on the Bitcoin side
     * @param amount bridge amount
     * @param to the receiver address on the Bitcoin side
     * @param referralCode referral code
     */
    function bridgeNativeToRunes(
        uint amount,
        string memory to,
        uint16 referralCode
    ) external payable whenNotPaused(WETH) nonReentrant {
        string memory tick = localToRunes[WETH];
        if (bytes(tick).length == 0) {
            revert UnsupportedToken();
        }

        if (amount == 0) {
            revert InvalidAmount();
        }

        uint totalFee = estimateRunesTotalFee();
        if (msg.value < amount + totalFee) {
            revert InsufficientValueSent();
        }

        // Deposit ether to get wrapped ether, lock WETH in contract
        IWETH(WETH).deposit{value: amount}();

        _bridgeToRunes(tick, WETH, amount, to, amount, referralCode);
    }

    /**
     * @notice Bridges BTC to the EVM chain
     * @param txId transaction id of the Bitcoin transaction
     * @param remoteChainId remote chain id of LayerZero(remoteChainId == 0, bridge to Ethereum; remoteChainId != 0, bridge to remote chain)
     * @param to the receiver address
     * @param amount the amount of wrapped BTC
     * @param referralCode referral code
     * @param refundAddress refund address for the LayerZero native fee (only for remote chain)
     * @param options additional options for message execution
     */
    function wrapBTC(
        string memory txId,
        uint32 remoteChainId,
        address to,
        uint amount,
        uint16 referralCode,
        address payable refundAddress,
        bytes calldata options
    ) external payable whenNotPaused(BBTC) onlyBtcBridge {
        if (to == address(0)) {
            revert InvalidTo();
        }
        if (amount == 0) {
            revert InvalidAmount();
        }
        if (bytes(txId).length == 0) {
            revert InvalidTxId();
        }
        if (txIdUsed[txId]) {
            revert AlreadyWrapped();
        }

        // mark txId as used, prevent reentrancy
        txIdUsed[txId] = true;

        if (remoteChainId == 0) {
            // bridge to current chain, mint wrapped BTC
            IMintableBurnable(BBTC).mint(to, amount);
        } else {
            // bridge to remote chain
            if (!supportedTokens[remoteChainId][BBTC]) {
                revert UnsupportedToken();
            }

            // estimate LayerZero native fee
            (uint nativeFee, ) = estimateBridgeFee(remoteChainId, options);
            if (msg.value < nativeFee) {
                revert InsufficientFee();
            }

            // mint wrapped BTC, locked in the contract
            IMintableBurnable(BBTC).mint(address(this), amount);

            // bridge to erc20
            _bridgeToErc20(
                BBTC,
                remoteChainId,
                amount,
                to,
                msg.value,
                referralCode,
                refundAddress,
                options
            );
        }

        emit WrapBTC(txId, remoteChainId, to, amount, referralCode);
    }

    /**
     * @notice Unwrap bBTC to BTC
     * @param amount the amount of wrapped BTC
     * @param to the receiver address
     * @param referralCode referral code
     */
    function unwrapBTC(
        uint amount,
        string memory to,
        uint16 referralCode
    ) external payable whenNotPaused(BBTC) {
        if (amount == 0) {
            revert InvalidAmount();
        }
        if (bytes(to).length == 0) {
            revert InvalidTo();
        }

        uint256 totalFee = estimateUnwrapBTCTotalFee();
        if (msg.value < totalFee) {
            revert InsufficientFee();
        }

        // transfer token to contract
        IERC20(BBTC).safeTransferFrom(_msgSender(), address(this), amount);

        // burn wrapped BTC
        IMintableBurnable(BBTC).burn(address(this), amount);

        emit UnwrapBTC(to, amount, referralCode);
    }

    /**
     * @notice Sets the fee charged for bridging
     * @param _fee the fee charged
     */
    function setFee(uint256 _fee) external onlyOwner {
        emit FeeChanged(fee, _fee);
        fee = _fee;
    }

    /**
     * @notice Bridges Brc20 to ERC20
     * Brc-20 has been received on the Bitcoin side(Unified Account), and then ERC-20 is sent to the user on the EVM side
     * @param _tick brc20 tick
     * @param _remoteChainId remote chain id (remoteChainId == 0, bridge to Ethereum; remoteChainId != 0, bridge to remote chain)
     * @param _to receiver address
     * @param _amount received amount
     * @param txId transaction id of the Bitcoin transaction
     * @param referralCode referral code
     * @param refundAddress refund address for the LayerZero native fee (only for remote chain)
     * @param options additional options for message execution
     */
    function brc20Received(
        string memory _tick,
        uint16 _remoteChainId,
        address _to,
        uint _amount,
        string memory txId,
        uint16 referralCode,
        address payable refundAddress,
        bytes calldata options
    ) external payable onlyBtcBridge {
        address localToken = brc20ToLocal[_tick];
        if (localToken == address(0)) {
            revert UnsupportedBrc20();
        }
        if (globalPaused || pausedTokens[localToken]) {
            revert Paused();
        }
        if (_to == address(0)) {
            revert InvalidTo();
        }
        if (_amount == 0) {
            revert InvalidAmount();
        }
        if (bytes(txId).length == 0) {
            revert InvalidTxId();
        }
        if (txIdUsed[txId]) {
            revert TxIdBeenUsed();
        }

        // mark txId as used, prevent reentrancy
        txIdUsed[txId] = true;

        // sub tvl
        uint tvl = brc20Tvls[localToken];
        if (tvl < _amount) {
            revert InsufficientLiquidity();
        }
        brc20Tvls[localToken] = tvl - _amount;

        if (_remoteChainId != 0) {
            // bridge to remote evm chain
            if (!supportedTokens[_remoteChainId][localToken]) {
                revert UnsupportedToken();
            }
            if (refundAddress == address(0)) {
                revert InvalidRefundAddress();
            }
            // estimate LayerZero native fee
            (uint nativeFee, ) = estimateBridgeFee(_remoteChainId, options);
            if (msg.value < nativeFee) {
                revert InsufficientFee();
            }

            // bridge to erc20
            _bridgeToErc20(
                localToken,
                _remoteChainId,
                _amount,
                _to,
                msg.value,
                referralCode,
                refundAddress,
                options
            );
        } else {
            if (localToken == WETH) {
                // unlock ether
                IWETH(WETH).withdraw(_amount);
                (bool success, ) = payable(_to).call{value: _amount}("");
                if (!success) {
                    revert UnlockETHFail();
                }
            } else {
                // bridge brc20 to current chain, unlock token
                IERC20(localToken).safeTransfer(_to, _amount);
            }
        }
        emit Brc20Received(
            ChainId.get(),
            _tick,
            _remoteChainId,
            localToken,
            _to,
            _amount,
            txId,
            referralCode
        );
    }

    /**
     * @notice Bridges `Runes` to ERC20 (remoteChainId != 0, bridge to remote chain)
     * Runes has been received on the Bitcoin side(Unified Account), and then ERC-20 is sent to the user on the EVM side
     * @param _tick runes tick
     * @param _remoteChainId remote chain id
     * @param _to receiver address
     * @param _amount received amount
     * @param txId transaction id of the Bitcoin transaction
     * @param referralCode referral code
     * @param refundAddress refund address for the LayerZero native fee
     * @param options additional options for message execution
     */
    function runesReceived(
        string memory _tick,
        uint16 _remoteChainId,
        address _to,
        uint _amount,
        string memory txId,
        uint16 referralCode,
        address payable refundAddress,
        bytes calldata options
    ) external payable onlyBtcBridge {
        address localToken = runesToLocal[_tick];
        if (localToken == address(0)) {
            revert UnsupportedRunes();
        }
        if (globalPaused || pausedTokens[localToken]) {
            revert Paused();
        }
        if (_to == address(0)) {
            revert InvalidTo();
        }
        if (_amount == 0) {
            revert InvalidAmount();
        }
        if (bytes(txId).length == 0) {
            revert InvalidTxId();
        }
        if (txIdUsed[txId]) {
            revert TxIdBeenUsed();
        }

        // mark txId as used, prevent reentrancy
        txIdUsed[txId] = true;

        // sub tvl
        uint tvl = runesTvls[localToken];
        if (tvl < _amount) {
            revert InsufficientLiquidity();
        }
        runesTvls[localToken] = tvl - _amount;

        if (_remoteChainId != 0) {
            // bridge to remote evm chain
            if (!supportedTokens[_remoteChainId][localToken]) {
                revert UnsupportedToken();
            }
            if (refundAddress == address(0)) {
                revert InvalidRefundAddress();
            }
            // estimate LayerZero native fee
            (uint nativeFee, ) = estimateBridgeFee(_remoteChainId, options);
            if (msg.value < nativeFee) {
                revert InsufficientFee();
            }

            // bridge to erc20
            _bridgeToErc20(
                localToken,
                _remoteChainId,
                _amount,
                _to,
                msg.value,
                referralCode,
                refundAddress,
                options
            );
        } else {
            if (localToken == WETH) {
                // unlock ether
                IWETH(WETH).withdraw(_amount);
                (bool success, ) = payable(_to).call{value: _amount}("");
                if (!success) {
                    revert UnlockETHFail();
                }
            } else {
                // bridge runes to current chain, unlock token
                IERC20(localToken).safeTransfer(_to, _amount);
            }
        }

        emit RunesReceived(
            ChainId.get(),
            _tick,
            _remoteChainId,
            localToken,
            _to,
            _amount,
            txId,
            referralCode
        );
    }

    /**
     * @notice Updates the TVL of BRC20 to Runes
     * BRC20 has been bridged to Runes, and then the TVL of BRC20 and Runes is updated
     * @param _tick brc20 tick
     * @param amount amount bridged from brc20 to runes
     */
    function updateBrc20ToRunesTvls(
        string memory _tick,
        uint256 amount
    ) external onlyBtcBridge {
        // reduce brc20 tvl
        address localToken = brc20ToLocal[_tick];
        if (localToken == address(0)) {
            revert UnsupportedBrc20();
        }
        if (globalPaused || pausedTokens[localToken]) {
            revert Paused();
        }

        uint brc20Tvl = brc20Tvls[localToken];
        if (brc20Tvl < amount) {
            revert InsufficientLiquidity();
        }
        brc20Tvls[localToken] = brc20Tvl - amount;

        // increase runes tvl
        string memory runesTick = localToRunes[localToken];
        if (bytes(runesTick).length == 0) {
            revert UnsupportedRunes();
        }
        uint runesTvl = runesTvls[localToken];
        runesTvls[localToken] = runesTvl + amount;

        emit Brc20ToRunesTvlsUpdated(_tick, amount);
    }

    /**
     * @notice Updates the TVL of Runes to BRC20
     * Runes has been bridged to BRC20, and then the TVL of Runes and BRC20 is updated
     * @param runesTick runes tick
     * @param amount amount bridged from runes to brc20
     */
    function updateRunesToBrc20Tvls(
        string memory runesTick,
        uint256 amount
    ) external onlyBtcBridge {
        // reduce runes tvl
        address localToken = runesToLocal[runesTick];
        if (localToken == address(0)) {
            revert UnsupportedRunes();
        }
        if (globalPaused || pausedTokens[localToken]) {
            revert Paused();
        }

        uint runesTvl = runesTvls[localToken];
        if (runesTvl < amount) {
            revert InsufficientLiquidity();
        }
        runesTvls[localToken] = runesTvl - amount;

        // increase brc20 tvl
        string memory brc20Tick = localToBrc20[localToken];
        if (bytes(brc20Tick).length == 0) {
            revert UnsupportedBrc20();
        }
        uint brc20Tvl = brc20Tvls[localToken];
        brc20Tvls[localToken] = brc20Tvl + amount;

        emit RunesToBrc20TvlsUpdated(runesTick, amount);
    }

    // Public functions

    /**
     * @dev Estimates the fee for bridging ERC20 to the remote chain
     * @param remoteChainId chain id of the remote chain
     * @param options Additional options for message execution
     */
    function estimateBridgeFee(
        uint32 remoteChainId,
        bytes calldata options
    ) public view returns (uint256 nativeFee, uint256 lzTokenFee) {
        // Only the payload format matters when estimating fee, not the actual data
        bytes memory payload = abi.encode(
            PT_MINT,
            address(this),
            address(this),
            0,
            0
        );
        MessagingFee memory msgFee = _quote(
            remoteChainId,
            payload,
            options,
            false /** _payInLzToken */
        );
        nativeFee = msgFee.nativeFee;
        lzTokenFee = msgFee.lzTokenFee;
    }

    /**
     * @notice Estimate the total fee for bridging ERC20 to the remote chain
     * @param remoteChainId The remote chain id
     * @param options Additional options for message execution
     */
    function estimateErc20TotalFee(
        uint32 remoteChainId,
        bytes calldata options
    ) public view returns (uint totalFee, uint nativeFee) {
        (nativeFee, ) = estimateBridgeFee(remoteChainId, options);
        totalFee = fee + nativeFee;
    }

    /**
     * @notice Estimate the total fee for bridging ERC20 to BRC20
     */
    function estimateBrc20TotalFee() public view returns (uint totalFee) {
        uint256 brc20TransferFee = getBitcoinTransferFeeInNative(
            brc20TransferFee
        );
        totalFee = fee + brc20TransferFee;
    }

    /**
     * @notice Estimate the total fee for bridging ERC20 to Runes
     */
    function estimateRunesTotalFee() public view returns (uint totalFee) {
        uint256 runesTransferFee = getBitcoinTransferFeeInNative(
            runesTransferFee
        );
        totalFee = fee + runesTransferFee;
    }

    /**
     * @notice Estimate the total fee for unwrapping BTC
     */
    function estimateUnwrapBTCTotalFee() public view returns (uint totalFee) {
        uint256 unwrapBtcFee = getBitcoinTransferFeeInNative(btcTransferFee);
        totalFee = fee + unwrapBtcFee;
    }

    // Internal functions

    /**
     * @notice Receives LayerZero message from the remote chain
     * @param _origin struct containing info about the message sender
     * @param payload payload data
     */
    function _lzReceive(
        Origin calldata _origin, // struct containing info about the message sender
        bytes32, // _guid: global packet identifier
        bytes calldata payload, // encoded message payload being received
        address, // _executor: the Executor address.
        bytes calldata // _extraData: arbitrary data appended by the Executor
    ) internal override {
        uint32 srcChainId = _origin.srcEid;
        (
            uint8 packetType,
            address token,
            address to,
            uint totalAmount,
            TokenType tokenType,
            string memory btcReceiver,
            uint16 referralCode,
            bool unwrapBtc
        ) = abi.decode(
                payload,
                (uint8, address, address, uint, TokenType, string, uint16, bool)
            );

        if (globalPaused || pausedTokens[token]) {
            revert Paused();
        }
        if (packetType != PT_UNLOCK) {
            revert UnknownPacketType();
        }
        if (!supportedTokens[srcChainId][token]) {
            revert UnsupportedToken();
        }
        if (
            unwrapBtc ||
            tokenType == TokenType.BRC20 ||
            tokenType == TokenType.RUNES
        ) {
            if (bytes(btcReceiver).length == 0) {
                revert InvalidBtcReceiver();
            }
        } else {
            if (to == address(0)) {
                revert InvalidTo();
            }
        }

        // sub tvl of erc20
        uint tvl = tvls[srcChainId][token];
        if (tvl < totalAmount) {
            revert InsufficientLiquidity();
        }
        tvls[srcChainId][token] = tvl - totalAmount;

        if (tokenType == TokenType.BRC20) {
            // directly bridge erc20 to brc20
            string memory tick = localToBrc20[token];
            if (bytes(tick).length == 0) {
                revert UnsupportedBrc20();
            }

            // increase tvl of brc20
            brc20Tvls[token] += totalAmount;
            emit BridgeToBrc20(
                ChainId.get(),
                tick,
                token,
                _msgSender(),
                btcReceiver,
                totalAmount,
                0,
                referralCode
            );
        } else if (tokenType == TokenType.RUNES) {
            // directly bridge erc20 to Runes
            string memory tick = localToRunes[token];
            if (bytes(tick).length == 0) {
                revert UnsupportedRunes();
            }

            // increase tvl of Runes
            runesTvls[token] += totalAmount;
            emit BridgeToRunes(
                ChainId.get(),
                tick,
                token,
                _msgSender(),
                btcReceiver,
                totalAmount,
                0,
                referralCode
            );
        } else if (tokenType == TokenType.ERC20) {
            if (token == WETH) {
                // unlock ether
                IWETH(WETH).withdraw(totalAmount);
                (bool success, ) = payable(to).call{value: totalAmount}("");
                if (!success) {
                    revert UnlockETHFail();
                }
                emit ReceiveToken(
                    address(0),
                    srcChainId,
                    to,
                    totalAmount,
                    tokenType,
                    btcReceiver,
                    referralCode
                );
            } else if (token == BBTC && unwrapBtc) {
                // bridge bBTC to BTC
                // burn wrapped BTC
                IMintableBurnable(BBTC).burn(address(this), totalAmount);

                emit UnwrapBTC(btcReceiver, totalAmount, referralCode);
            } else {
                // unlock erc20 token
                IERC20(token).safeTransfer(to, totalAmount);
                emit ReceiveToken(
                    token,
                    srcChainId,
                    to,
                    totalAmount,
                    tokenType,
                    btcReceiver,
                    referralCode
                );
            }
        }
    }

    // Private functions

    /**
     * @notice Bridges ERC20 to the remote chain
     * @param localToken the local token address
     * @param remoteChainId the remote chain id
     * @param amount bridge amount
     * @param to the receiver address on the remote chain
     * @param nativeFee the native fee
     * @param referralCode referral code
     * @param refundAddress specifies the address to which any excess fees should be refunded
     * @param options Additional options for message execution
     */
    function _bridgeToErc20(
        address localToken,
        uint32 remoteChainId,
        uint amount,
        address to,
        uint nativeFee,
        uint16 referralCode,
        address refundAddress,
        bytes memory options
    ) private {
        if (to == address(0)) {
            revert InvalidTo();
        }

        tvls[remoteChainId][localToken] += amount;

        bytes memory payload = abi.encode(
            PT_MINT,
            localToken,
            to,
            amount,
            referralCode
        );
        _lzSend(
            remoteChainId,
            payload,
            options,
            MessagingFee(nativeFee, 0),
            payable(refundAddress)
        );
        emit SendToken(
            localToken,
            remoteChainId,
            _msgSender(),
            to,
            amount,
            nativeFee,
            referralCode
        );
    }

    /**
     * @notice Bridges ERC20 to BRC20
     * @param tick brc20 tick
     * @param token the local token
     * @param amount bridge amount
     * @param to the receiver address on the Bitcoin side
     * @param nativeFee the native fee
     * @param referralCode referral code
     */
    function _bridgeToBrc20(
        string memory tick,
        address token,
        uint amount,
        string memory to,
        uint nativeFee,
        uint16 referralCode
    ) private {
        if (bytes(to).length == 0) {
            revert InvalidTo();
        }

        brc20Tvls[token] += amount;
        emit BridgeToBrc20(
            ChainId.get(),
            tick,
            token,
            _msgSender(),
            to,
            amount,
            nativeFee,
            referralCode
        );
    }

    /**
     * @notice Bridges ERC20 to Runes
     * @param tick runes tick
     * @param token the local token
     * @param amount bridge amount
     * @param to the receiver address on the Bitcoin side
     * @param nativeFee the native fee
     * @param referralCode referral code
     */
    function _bridgeToRunes(
        string memory tick,
        address token,
        uint amount,
        string memory to,
        uint nativeFee,
        uint16 referralCode
    ) private {
        if (bytes(to).length == 0) {
            revert InvalidTo();
        }

        runesTvls[token] += amount;
        emit BridgeToRunes(
            ChainId.get(),
            tick,
            token,
            _msgSender(),
            to,
            amount,
            nativeFee,
            referralCode
        );
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0;

import { IMessageLibManager } from "./IMessageLibManager.sol";
import { IMessagingComposer } from "./IMessagingComposer.sol";
import { IMessagingChannel } from "./IMessagingChannel.sol";
import { IMessagingContext } from "./IMessagingContext.sol";

struct MessagingParams {
    uint32 dstEid;
    bytes32 receiver;
    bytes message;
    bytes options;
    bool payInLzToken;
}

struct MessagingReceipt {
    bytes32 guid;
    uint64 nonce;
    MessagingFee fee;
}

struct MessagingFee {
    uint256 nativeFee;
    uint256 lzTokenFee;
}

struct Origin {
    uint32 srcEid;
    bytes32 sender;
    uint64 nonce;
}

interface ILayerZeroEndpointV2 is IMessageLibManager, IMessagingComposer, IMessagingChannel, IMessagingContext {
    event PacketSent(bytes encodedPayload, bytes options, address sendLibrary);

    event PacketVerified(Origin origin, address receiver, bytes32 payloadHash);

    event PacketDelivered(Origin origin, address receiver);

    event LzReceiveAlert(
        address indexed receiver,
        address indexed executor,
        Origin origin,
        bytes32 guid,
        uint256 gas,
        uint256 value,
        bytes message,
        bytes extraData,
        bytes reason
    );

    event LzTokenSet(address token);

    event DelegateSet(address sender, address delegate);

    function quote(MessagingParams calldata _params, address _sender) external view returns (MessagingFee memory);

    function send(
        MessagingParams calldata _params,
        address _refundAddress
    ) external payable returns (MessagingReceipt memory);

    function verify(Origin calldata _origin, address _receiver, bytes32 _payloadHash) external;

    function verifiable(Origin calldata _origin, address _receiver) external view returns (bool);

    function initializable(Origin calldata _origin, address _receiver) external view returns (bool);

    function lzReceive(
        Origin calldata _origin,
        address _receiver,
        bytes32 _guid,
        bytes calldata _message,
        bytes calldata _extraData
    ) external payable;

    // oapp can burn messages partially by calling this function with its own business logic if messages are verified in order
    function clear(address _oapp, Origin calldata _origin, bytes32 _guid, bytes calldata _message) external;

    function setLzToken(address _lzToken) external;

    function lzToken() external view returns (address);

    function nativeToken() external view returns (address);

    function setDelegate(address _delegate) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0;

import { Origin } from "./ILayerZeroEndpointV2.sol";

interface ILayerZeroReceiver {
    function allowInitializePath(Origin calldata _origin) external view returns (bool);

    function nextNonce(uint32 _eid, bytes32 _sender) external view returns (uint64);

    function lzReceive(
        Origin calldata _origin,
        bytes32 _guid,
        bytes calldata _message,
        address _executor,
        bytes calldata _extraData
    ) external payable;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0;

struct SetConfigParam {
    uint32 eid;
    uint32 configType;
    bytes config;
}

interface IMessageLibManager {
    struct Timeout {
        address lib;
        uint256 expiry;
    }

    event LibraryRegistered(address newLib);
    event DefaultSendLibrarySet(uint32 eid, address newLib);
    event DefaultReceiveLibrarySet(uint32 eid, address newLib);
    event DefaultReceiveLibraryTimeoutSet(uint32 eid, address oldLib, uint256 expiry);
    event SendLibrarySet(address sender, uint32 eid, address newLib);
    event ReceiveLibrarySet(address receiver, uint32 eid, address newLib);
    event ReceiveLibraryTimeoutSet(address receiver, uint32 eid, address oldLib, uint256 timeout);

    function registerLibrary(address _lib) external;

    function isRegisteredLibrary(address _lib) external view returns (bool);

    function getRegisteredLibraries() external view returns (address[] memory);

    function setDefaultSendLibrary(uint32 _eid, address _newLib) external;

    function defaultSendLibrary(uint32 _eid) external view returns (address);

    function setDefaultReceiveLibrary(uint32 _eid, address _newLib, uint256 _gracePeriod) external;

    function defaultReceiveLibrary(uint32 _eid) external view returns (address);

    function setDefaultReceiveLibraryTimeout(uint32 _eid, address _lib, uint256 _expiry) external;

    function defaultReceiveLibraryTimeout(uint32 _eid) external view returns (address lib, uint256 expiry);

    function isSupportedEid(uint32 _eid) external view returns (bool);

    function isValidReceiveLibrary(address _receiver, uint32 _eid, address _lib) external view returns (bool);

    /// ------------------- OApp interfaces -------------------
    function setSendLibrary(address _oapp, uint32 _eid, address _newLib) external;

    function getSendLibrary(address _sender, uint32 _eid) external view returns (address lib);

    function isDefaultSendLibrary(address _sender, uint32 _eid) external view returns (bool);

    function setReceiveLibrary(address _oapp, uint32 _eid, address _newLib, uint256 _gracePeriod) external;

    function getReceiveLibrary(address _receiver, uint32 _eid) external view returns (address lib, bool isDefault);

    function setReceiveLibraryTimeout(address _oapp, uint32 _eid, address _lib, uint256 _expiry) external;

    function receiveLibraryTimeout(address _receiver, uint32 _eid) external view returns (address lib, uint256 expiry);

    function setConfig(address _oapp, address _lib, SetConfigParam[] calldata _params) external;

    function getConfig(
        address _oapp,
        address _lib,
        uint32 _eid,
        uint32 _configType
    ) external view returns (bytes memory config);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0;

interface IMessagingChannel {
    event InboundNonceSkipped(uint32 srcEid, bytes32 sender, address receiver, uint64 nonce);
    event PacketNilified(uint32 srcEid, bytes32 sender, address receiver, uint64 nonce, bytes32 payloadHash);
    event PacketBurnt(uint32 srcEid, bytes32 sender, address receiver, uint64 nonce, bytes32 payloadHash);

    function eid() external view returns (uint32);

    // this is an emergency function if a message cannot be verified for some reasons
    // required to provide _nextNonce to avoid race condition
    function skip(address _oapp, uint32 _srcEid, bytes32 _sender, uint64 _nonce) external;

    function nilify(address _oapp, uint32 _srcEid, bytes32 _sender, uint64 _nonce, bytes32 _payloadHash) external;

    function burn(address _oapp, uint32 _srcEid, bytes32 _sender, uint64 _nonce, bytes32 _payloadHash) external;

    function nextGuid(address _sender, uint32 _dstEid, bytes32 _receiver) external view returns (bytes32);

    function inboundNonce(address _receiver, uint32 _srcEid, bytes32 _sender) external view returns (uint64);

    function outboundNonce(address _sender, uint32 _dstEid, bytes32 _receiver) external view returns (uint64);

    function inboundPayloadHash(
        address _receiver,
        uint32 _srcEid,
        bytes32 _sender,
        uint64 _nonce
    ) external view returns (bytes32);

    function lazyInboundNonce(address _receiver, uint32 _srcEid, bytes32 _sender) external view returns (uint64);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0;

interface IMessagingComposer {
    event ComposeSent(address from, address to, bytes32 guid, uint16 index, bytes message);
    event ComposeDelivered(address from, address to, bytes32 guid, uint16 index);
    event LzComposeAlert(
        address indexed from,
        address indexed to,
        address indexed executor,
        bytes32 guid,
        uint16 index,
        uint256 gas,
        uint256 value,
        bytes message,
        bytes extraData,
        bytes reason
    );

    function composeQueue(
        address _from,
        address _to,
        bytes32 _guid,
        uint16 _index
    ) external view returns (bytes32 messageHash);

    function sendCompose(address _to, bytes32 _guid, uint16 _index, bytes calldata _message) external;

    function lzCompose(
        address _from,
        address _to,
        bytes32 _guid,
        uint16 _index,
        bytes calldata _message,
        bytes calldata _extraData
    ) external payable;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0;

interface IMessagingContext {
    function isSendingMessage() external view returns (bool);

    function getSendContext() external view returns (uint32 dstEid, address sender);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.20;

import { ILayerZeroEndpointV2 } from "@layerzerolabs/lz-evm-protocol-v2/contracts/interfaces/ILayerZeroEndpointV2.sol";

/**
 * @title IOAppCore
 */
interface IOAppCore {
    // Custom error messages
    error OnlyPeer(uint32 eid, bytes32 sender);
    error NoPeer(uint32 eid);
    error InvalidEndpointCall();
    error InvalidDelegate();

    // Event emitted when a peer (OApp) is set for a corresponding endpoint
    event PeerSet(uint32 eid, bytes32 peer);

    /**
     * @notice Retrieves the OApp version information.
     * @return senderVersion The version of the OAppSender.sol contract.
     * @return receiverVersion The version of the OAppReceiver.sol contract.
     */
    function oAppVersion() external view returns (uint64 senderVersion, uint64 receiverVersion);

    /**
     * @notice Retrieves the LayerZero endpoint associated with the OApp.
     * @return iEndpoint The LayerZero endpoint as an interface.
     */
    function endpoint() external view returns (ILayerZeroEndpointV2 iEndpoint);

    /**
     * @notice Retrieves the peer (OApp) associated with a corresponding endpoint.
     * @param _eid The endpoint ID.
     * @return peer The peer address (OApp instance) associated with the corresponding endpoint.
     */
    function peers(uint32 _eid) external view returns (bytes32 peer);

    /**
     * @notice Sets the peer address (OApp instance) for a corresponding endpoint.
     * @param _eid The endpoint ID.
     * @param _peer The address of the peer to be associated with the corresponding endpoint.
     */
    function setPeer(uint32 _eid, bytes32 _peer) external;

    /**
     * @notice Sets the delegate address for the OApp Core.
     * @param _delegate The address of the delegate to be set.
     */
    function setDelegate(address _delegate) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import { ILayerZeroReceiver, Origin } from "@layerzerolabs/lz-evm-protocol-v2/contracts/interfaces/ILayerZeroReceiver.sol";

interface IOAppReceiver is ILayerZeroReceiver {
    /**
     * @notice Indicates whether an address is an approved composeMsg sender to the Endpoint.
     * @param _origin The origin information containing the source endpoint and sender address.
     *  - srcEid: The source chain endpoint ID.
     *  - sender: The sender address on the src chain.
     *  - nonce: The nonce of the message.
     * @param _message The lzReceive payload.
     * @param _sender The sender address.
     * @return isSender Is a valid sender.
     *
     * @dev Applications can optionally choose to implement a separate composeMsg sender that is NOT the bridging layer.
     * @dev The default sender IS the OAppReceiver implementer.
     */
    function isComposeMsgSender(
        Origin calldata _origin,
        bytes calldata _message,
        address _sender
    ) external view returns (bool isSender);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.20;

// @dev Import the 'MessagingFee' and 'MessagingReceipt' so it's exposed to OApp implementers
// solhint-disable-next-line no-unused-import
import { OAppSender, MessagingFee, MessagingReceipt } from "./OAppSender.sol";
// @dev Import the 'Origin' so it's exposed to OApp implementers
// solhint-disable-next-line no-unused-import
import { OAppReceiver, Origin } from "./OAppReceiver.sol";
import { OAppCore } from "./OAppCore.sol";

/**
 * @title OApp
 * @dev Abstract contract serving as the base for OApp implementation, combining OAppSender and OAppReceiver functionality.
 */
abstract contract OApp is OAppSender, OAppReceiver {
    /**
     * @dev Constructor to initialize the OApp with the provided endpoint and owner.
     * @param _endpoint The address of the LOCAL LayerZero endpoint.
     * @param _delegate The delegate capable of making OApp configurations inside of the endpoint.
     */
    constructor(address _endpoint, address _delegate) OAppCore(_endpoint, _delegate) {}

    /**
     * @notice Retrieves the OApp version information.
     * @return senderVersion The version of the OAppSender.sol implementation.
     * @return receiverVersion The version of the OAppReceiver.sol implementation.
     */
    function oAppVersion()
        public
        pure
        virtual
        override(OAppSender, OAppReceiver)
        returns (uint64 senderVersion, uint64 receiverVersion)
    {
        return (SENDER_VERSION, RECEIVER_VERSION);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.20;

import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";
import { IOAppCore, ILayerZeroEndpointV2 } from "./interfaces/IOAppCore.sol";

/**
 * @title OAppCore
 * @dev Abstract contract implementing the IOAppCore interface with basic OApp configurations.
 */
abstract contract OAppCore is IOAppCore, Ownable {
    // The LayerZero endpoint associated with the given OApp
    ILayerZeroEndpointV2 public immutable endpoint;

    // Mapping to store peers associated with corresponding endpoints
    mapping(uint32 eid => bytes32 peer) public peers;

    /**
     * @dev Constructor to initialize the OAppCore with the provided endpoint and delegate.
     * @param _endpoint The address of the LOCAL Layer Zero endpoint.
     * @param _delegate The delegate capable of making OApp configurations inside of the endpoint.
     *
     * @dev The delegate typically should be set as the owner of the contract.
     */
    constructor(address _endpoint, address _delegate) {
        endpoint = ILayerZeroEndpointV2(_endpoint);

        if (_delegate == address(0)) revert InvalidDelegate();
        endpoint.setDelegate(_delegate);
    }

    /**
     * @notice Sets the peer address (OApp instance) for a corresponding endpoint.
     * @param _eid The endpoint ID.
     * @param _peer The address of the peer to be associated with the corresponding endpoint.
     *
     * @dev Only the owner/admin of the OApp can call this function.
     * @dev Indicates that the peer is trusted to send LayerZero messages to this OApp.
     * @dev Set this to bytes32(0) to remove the peer address.
     * @dev Peer is a bytes32 to accommodate non-evm chains.
     */
    function setPeer(uint32 _eid, bytes32 _peer) public virtual onlyOwner {
        _setPeer(_eid, _peer);
    }

    /**
     * @notice Sets the peer address (OApp instance) for a corresponding endpoint.
     * @param _eid The endpoint ID.
     * @param _peer The address of the peer to be associated with the corresponding endpoint.
     *
     * @dev Indicates that the peer is trusted to send LayerZero messages to this OApp.
     * @dev Set this to bytes32(0) to remove the peer address.
     * @dev Peer is a bytes32 to accommodate non-evm chains.
     */
    function _setPeer(uint32 _eid, bytes32 _peer) internal virtual {
        peers[_eid] = _peer;
        emit PeerSet(_eid, _peer);
    }

    /**
     * @notice Internal function to get the peer address associated with a specific endpoint; reverts if NOT set.
     * ie. the peer is set to bytes32(0).
     * @param _eid The endpoint ID.
     * @return peer The address of the peer associated with the specified endpoint.
     */
    function _getPeerOrRevert(uint32 _eid) internal view virtual returns (bytes32) {
        bytes32 peer = peers[_eid];
        if (peer == bytes32(0)) revert NoPeer(_eid);
        return peer;
    }

    /**
     * @notice Sets the delegate address for the OApp.
     * @param _delegate The address of the delegate to be set.
     *
     * @dev Only the owner/admin of the OApp can call this function.
     * @dev Provides the ability for a delegate to set configs, on behalf of the OApp, directly on the Endpoint contract.
     */
    function setDelegate(address _delegate) public onlyOwner {
        endpoint.setDelegate(_delegate);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.20;

import { IOAppReceiver, Origin } from "./interfaces/IOAppReceiver.sol";
import { OAppCore } from "./OAppCore.sol";

/**
 * @title OAppReceiver
 * @dev Abstract contract implementing the ILayerZeroReceiver interface and extending OAppCore for OApp receivers.
 */
abstract contract OAppReceiver is IOAppReceiver, OAppCore {
    // Custom error message for when the caller is not the registered endpoint/
    error OnlyEndpoint(address addr);

    // @dev The version of the OAppReceiver implementation.
    // @dev Version is bumped when changes are made to this contract.
    uint64 internal constant RECEIVER_VERSION = 2;

    /**
     * @notice Retrieves the OApp version information.
     * @return senderVersion The version of the OAppSender.sol contract.
     * @return receiverVersion The version of the OAppReceiver.sol contract.
     *
     * @dev Providing 0 as the default for OAppSender version. Indicates that the OAppSender is not implemented.
     * ie. this is a RECEIVE only OApp.
     * @dev If the OApp uses both OAppSender and OAppReceiver, then this needs to be override returning the correct versions.
     */
    function oAppVersion() public view virtual returns (uint64 senderVersion, uint64 receiverVersion) {
        return (0, RECEIVER_VERSION);
    }

    /**
     * @notice Indicates whether an address is an approved composeMsg sender to the Endpoint.
     * @dev _origin The origin information containing the source endpoint and sender address.
     *  - srcEid: The source chain endpoint ID.
     *  - sender: The sender address on the src chain.
     *  - nonce: The nonce of the message.
     * @dev _message The lzReceive payload.
     * @param _sender The sender address.
     * @return isSender Is a valid sender.
     *
     * @dev Applications can optionally choose to implement separate composeMsg senders that are NOT the bridging layer.
     * @dev The default sender IS the OAppReceiver implementer.
     */
    function isComposeMsgSender(
        Origin calldata /*_origin*/,
        bytes calldata /*_message*/,
        address _sender
    ) public view virtual returns (bool) {
        return _sender == address(this);
    }

    /**
     * @notice Checks if the path initialization is allowed based on the provided origin.
     * @param origin The origin information containing the source endpoint and sender address.
     * @return Whether the path has been initialized.
     *
     * @dev This indicates to the endpoint that the OApp has enabled msgs for this particular path to be received.
     * @dev This defaults to assuming if a peer has been set, its initialized.
     * Can be overridden by the OApp if there is other logic to determine this.
     */
    function allowInitializePath(Origin calldata origin) public view virtual returns (bool) {
        return peers[origin.srcEid] == origin.sender;
    }

    /**
     * @notice Retrieves the next nonce for a given source endpoint and sender address.
     * @dev _srcEid The source endpoint ID.
     * @dev _sender The sender address.
     * @return nonce The next nonce.
     *
     * @dev The path nonce starts from 1. If 0 is returned it means that there is NO nonce ordered enforcement.
     * @dev Is required by the off-chain executor to determine the OApp expects msg execution is ordered.
     * @dev This is also enforced by the OApp.
     * @dev By default this is NOT enabled. ie. nextNonce is hardcoded to return 0.
     */
    function nextNonce(uint32 /*_srcEid*/, bytes32 /*_sender*/) public view virtual returns (uint64 nonce) {
        return 0;
    }

    /**
     * @dev Entry point for receiving messages or packets from the endpoint.
     * @param _origin The origin information containing the source endpoint and sender address.
     *  - srcEid: The source chain endpoint ID.
     *  - sender: The sender address on the src chain.
     *  - nonce: The nonce of the message.
     * @param _guid The unique identifier for the received LayerZero message.
     * @param _message The payload of the received message.
     * @param _executor The address of the executor for the received message.
     * @param _extraData Additional arbitrary data provided by the corresponding executor.
     *
     * @dev Entry point for receiving msg/packet from the LayerZero endpoint.
     */
    function lzReceive(
        Origin calldata _origin,
        bytes32 _guid,
        bytes calldata _message,
        address _executor,
        bytes calldata _extraData
    ) public payable virtual {
        // Ensures that only the endpoint can attempt to lzReceive() messages to this OApp.
        if (address(endpoint) != msg.sender) revert OnlyEndpoint(msg.sender);

        // Ensure that the sender matches the expected peer for the source endpoint.
        if (_getPeerOrRevert(_origin.srcEid) != _origin.sender) revert OnlyPeer(_origin.srcEid, _origin.sender);

        // Call the internal OApp implementation of lzReceive.
        _lzReceive(_origin, _guid, _message, _executor, _extraData);
    }

    /**
     * @dev Internal function to implement lzReceive logic without needing to copy the basic parameter validation.
     */
    function _lzReceive(
        Origin calldata _origin,
        bytes32 _guid,
        bytes calldata _message,
        address _executor,
        bytes calldata _extraData
    ) internal virtual;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.20;

import { SafeERC20, IERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import { MessagingParams, MessagingFee, MessagingReceipt } from "@layerzerolabs/lz-evm-protocol-v2/contracts/interfaces/ILayerZeroEndpointV2.sol";
import { OAppCore } from "./OAppCore.sol";

/**
 * @title OAppSender
 * @dev Abstract contract implementing the OAppSender functionality for sending messages to a LayerZero endpoint.
 */
abstract contract OAppSender is OAppCore {
    using SafeERC20 for IERC20;

    // Custom error messages
    error NotEnoughNative(uint256 msgValue);
    error LzTokenUnavailable();

    // @dev The version of the OAppSender implementation.
    // @dev Version is bumped when changes are made to this contract.
    uint64 internal constant SENDER_VERSION = 1;

    /**
     * @notice Retrieves the OApp version information.
     * @return senderVersion The version of the OAppSender.sol contract.
     * @return receiverVersion The version of the OAppReceiver.sol contract.
     *
     * @dev Providing 0 as the default for OAppReceiver version. Indicates that the OAppReceiver is not implemented.
     * ie. this is a SEND only OApp.
     * @dev If the OApp uses both OAppSender and OAppReceiver, then this needs to be override returning the correct versions
     */
    function oAppVersion() public view virtual returns (uint64 senderVersion, uint64 receiverVersion) {
        return (SENDER_VERSION, 0);
    }

    /**
     * @dev Internal function to interact with the LayerZero EndpointV2.quote() for fee calculation.
     * @param _dstEid The destination endpoint ID.
     * @param _message The message payload.
     * @param _options Additional options for the message.
     * @param _payInLzToken Flag indicating whether to pay the fee in LZ tokens.
     * @return fee The calculated MessagingFee for the message.
     *      - nativeFee: The native fee for the message.
     *      - lzTokenFee: The LZ token fee for the message.
     */
    function _quote(
        uint32 _dstEid,
        bytes memory _message,
        bytes memory _options,
        bool _payInLzToken
    ) internal view virtual returns (MessagingFee memory fee) {
        return
            endpoint.quote(
                MessagingParams(_dstEid, _getPeerOrRevert(_dstEid), _message, _options, _payInLzToken),
                address(this)
            );
    }

    /**
     * @dev Internal function to interact with the LayerZero EndpointV2.send() for sending a message.
     * @param _dstEid The destination endpoint ID.
     * @param _message The message payload.
     * @param _options Additional options for the message.
     * @param _fee The calculated LayerZero fee for the message.
     *      - nativeFee: The native fee.
     *      - lzTokenFee: The lzToken fee.
     * @param _refundAddress The address to receive any excess fee values sent to the endpoint.
     * @return receipt The receipt for the sent message.
     *      - guid: The unique identifier for the sent message.
     *      - nonce: The nonce of the sent message.
     *      - fee: The LayerZero fee incurred for the message.
     */
    function _lzSend(
        uint32 _dstEid,
        bytes memory _message,
        bytes memory _options,
        MessagingFee memory _fee,
        address _refundAddress
    ) internal virtual returns (MessagingReceipt memory receipt) {
        // @dev Push corresponding fees to the endpoint, any excess is sent back to the _refundAddress from the endpoint.
        uint256 messageValue = _payNative(_fee.nativeFee);
        if (_fee.lzTokenFee > 0) _payLzToken(_fee.lzTokenFee);

        return
            // solhint-disable-next-line check-send-result
            endpoint.send{ value: messageValue }(
                MessagingParams(_dstEid, _getPeerOrRevert(_dstEid), _message, _options, _fee.lzTokenFee > 0),
                _refundAddress
            );
    }

    /**
     * @dev Internal function to pay the native fee associated with the message.
     * @param _nativeFee The native fee to be paid.
     * @return nativeFee The amount of native currency paid.
     *
     * @dev If the OApp needs to initiate MULTIPLE LayerZero messages in a single transaction,
     * this will need to be overridden because msg.value would contain multiple lzFees.
     * @dev Should be overridden in the event the LayerZero endpoint requires a different native currency.
     * @dev Some EVMs use an ERC20 as a method for paying transactions/gasFees.
     * @dev The endpoint is EITHER/OR, ie. it will NOT support both types of native payment at a time.
     */
    function _payNative(uint256 _nativeFee) internal virtual returns (uint256 nativeFee) {
        if (msg.value != _nativeFee) revert NotEnoughNative(msg.value);
        return _nativeFee;
    }

    /**
     * @dev Internal function to pay the LZ token fee associated with the message.
     * @param _lzTokenFee The LZ token fee to be paid.
     *
     * @dev If the caller is trying to pay in the specified lzToken, then the lzTokenFee is passed to the endpoint.
     * @dev Any excess sent, is passed back to the specified _refundAddress in the _lzSend().
     */
    function _payLzToken(uint256 _lzTokenFee) internal virtual {
        // @dev Cannot cache the token because it is not immutable in the endpoint.
        address lzToken = endpoint.lzToken();
        if (lzToken == address(0)) revert LzTokenUnavailable();

        // Pay LZ token fee by sending tokens to the endpoint.
        IERC20(lzToken).safeTransferFrom(msg.sender, address(endpoint), _lzTokenFee);
    }
}

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

pragma solidity ^0.8.0;

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

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

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

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

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

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

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

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

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

// 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 v4.8.0) (utils/math/SafeCast.sol)
// This file was procedurally generated from scripts/generate/templates/SafeCast.js.

pragma solidity ^0.8.0;

/**
 * @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow
 * checks.
 *
 * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can
 * easily result in undesired exploitation or bugs, since developers usually
 * assume that overflows raise errors. `SafeCast` restores this intuition by
 * reverting the transaction when such an operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 *
 * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing
 * all math on `uint256` and `int256` and then downcasting.
 */
library SafeCast {
    /**
     * @dev Returns the downcasted uint248 from uint256, reverting on
     * overflow (when the input is greater than largest uint248).
     *
     * Counterpart to Solidity's `uint248` operator.
     *
     * Requirements:
     *
     * - input must fit into 248 bits
     *
     * _Available since v4.7._
     */
    function toUint248(uint256 value) internal pure returns (uint248) {
        require(value <= type(uint248).max, "SafeCast: value doesn't fit in 248 bits");
        return uint248(value);
    }

    /**
     * @dev Returns the downcasted uint240 from uint256, reverting on
     * overflow (when the input is greater than largest uint240).
     *
     * Counterpart to Solidity's `uint240` operator.
     *
     * Requirements:
     *
     * - input must fit into 240 bits
     *
     * _Available since v4.7._
     */
    function toUint240(uint256 value) internal pure returns (uint240) {
        require(value <= type(uint240).max, "SafeCast: value doesn't fit in 240 bits");
        return uint240(value);
    }

    /**
     * @dev Returns the downcasted uint232 from uint256, reverting on
     * overflow (when the input is greater than largest uint232).
     *
     * Counterpart to Solidity's `uint232` operator.
     *
     * Requirements:
     *
     * - input must fit into 232 bits
     *
     * _Available since v4.7._
     */
    function toUint232(uint256 value) internal pure returns (uint232) {
        require(value <= type(uint232).max, "SafeCast: value doesn't fit in 232 bits");
        return uint232(value);
    }

    /**
     * @dev Returns the downcasted uint224 from uint256, reverting on
     * overflow (when the input is greater than largest uint224).
     *
     * Counterpart to Solidity's `uint224` operator.
     *
     * Requirements:
     *
     * - input must fit into 224 bits
     *
     * _Available since v4.2._
     */
    function toUint224(uint256 value) internal pure returns (uint224) {
        require(value <= type(uint224).max, "SafeCast: value doesn't fit in 224 bits");
        return uint224(value);
    }

    /**
     * @dev Returns the downcasted uint216 from uint256, reverting on
     * overflow (when the input is greater than largest uint216).
     *
     * Counterpart to Solidity's `uint216` operator.
     *
     * Requirements:
     *
     * - input must fit into 216 bits
     *
     * _Available since v4.7._
     */
    function toUint216(uint256 value) internal pure returns (uint216) {
        require(value <= type(uint216).max, "SafeCast: value doesn't fit in 216 bits");
        return uint216(value);
    }

    /**
     * @dev Returns the downcasted uint208 from uint256, reverting on
     * overflow (when the input is greater than largest uint208).
     *
     * Counterpart to Solidity's `uint208` operator.
     *
     * Requirements:
     *
     * - input must fit into 208 bits
     *
     * _Available since v4.7._
     */
    function toUint208(uint256 value) internal pure returns (uint208) {
        require(value <= type(uint208).max, "SafeCast: value doesn't fit in 208 bits");
        return uint208(value);
    }

    /**
     * @dev Returns the downcasted uint200 from uint256, reverting on
     * overflow (when the input is greater than largest uint200).
     *
     * Counterpart to Solidity's `uint200` operator.
     *
     * Requirements:
     *
     * - input must fit into 200 bits
     *
     * _Available since v4.7._
     */
    function toUint200(uint256 value) internal pure returns (uint200) {
        require(value <= type(uint200).max, "SafeCast: value doesn't fit in 200 bits");
        return uint200(value);
    }

    /**
     * @dev Returns the downcasted uint192 from uint256, reverting on
     * overflow (when the input is greater than largest uint192).
     *
     * Counterpart to Solidity's `uint192` operator.
     *
     * Requirements:
     *
     * - input must fit into 192 bits
     *
     * _Available since v4.7._
     */
    function toUint192(uint256 value) internal pure returns (uint192) {
        require(value <= type(uint192).max, "SafeCast: value doesn't fit in 192 bits");
        return uint192(value);
    }

    /**
     * @dev Returns the downcasted uint184 from uint256, reverting on
     * overflow (when the input is greater than largest uint184).
     *
     * Counterpart to Solidity's `uint184` operator.
     *
     * Requirements:
     *
     * - input must fit into 184 bits
     *
     * _Available since v4.7._
     */
    function toUint184(uint256 value) internal pure returns (uint184) {
        require(value <= type(uint184).max, "SafeCast: value doesn't fit in 184 bits");
        return uint184(value);
    }

    /**
     * @dev Returns the downcasted uint176 from uint256, reverting on
     * overflow (when the input is greater than largest uint176).
     *
     * Counterpart to Solidity's `uint176` operator.
     *
     * Requirements:
     *
     * - input must fit into 176 bits
     *
     * _Available since v4.7._
     */
    function toUint176(uint256 value) internal pure returns (uint176) {
        require(value <= type(uint176).max, "SafeCast: value doesn't fit in 176 bits");
        return uint176(value);
    }

    /**
     * @dev Returns the downcasted uint168 from uint256, reverting on
     * overflow (when the input is greater than largest uint168).
     *
     * Counterpart to Solidity's `uint168` operator.
     *
     * Requirements:
     *
     * - input must fit into 168 bits
     *
     * _Available since v4.7._
     */
    function toUint168(uint256 value) internal pure returns (uint168) {
        require(value <= type(uint168).max, "SafeCast: value doesn't fit in 168 bits");
        return uint168(value);
    }

    /**
     * @dev Returns the downcasted uint160 from uint256, reverting on
     * overflow (when the input is greater than largest uint160).
     *
     * Counterpart to Solidity's `uint160` operator.
     *
     * Requirements:
     *
     * - input must fit into 160 bits
     *
     * _Available since v4.7._
     */
    function toUint160(uint256 value) internal pure returns (uint160) {
        require(value <= type(uint160).max, "SafeCast: value doesn't fit in 160 bits");
        return uint160(value);
    }

    /**
     * @dev Returns the downcasted uint152 from uint256, reverting on
     * overflow (when the input is greater than largest uint152).
     *
     * Counterpart to Solidity's `uint152` operator.
     *
     * Requirements:
     *
     * - input must fit into 152 bits
     *
     * _Available since v4.7._
     */
    function toUint152(uint256 value) internal pure returns (uint152) {
        require(value <= type(uint152).max, "SafeCast: value doesn't fit in 152 bits");
        return uint152(value);
    }

    /**
     * @dev Returns the downcasted uint144 from uint256, reverting on
     * overflow (when the input is greater than largest uint144).
     *
     * Counterpart to Solidity's `uint144` operator.
     *
     * Requirements:
     *
     * - input must fit into 144 bits
     *
     * _Available since v4.7._
     */
    function toUint144(uint256 value) internal pure returns (uint144) {
        require(value <= type(uint144).max, "SafeCast: value doesn't fit in 144 bits");
        return uint144(value);
    }

    /**
     * @dev Returns the downcasted uint136 from uint256, reverting on
     * overflow (when the input is greater than largest uint136).
     *
     * Counterpart to Solidity's `uint136` operator.
     *
     * Requirements:
     *
     * - input must fit into 136 bits
     *
     * _Available since v4.7._
     */
    function toUint136(uint256 value) internal pure returns (uint136) {
        require(value <= type(uint136).max, "SafeCast: value doesn't fit in 136 bits");
        return uint136(value);
    }

    /**
     * @dev Returns the downcasted uint128 from uint256, reverting on
     * overflow (when the input is greater than largest uint128).
     *
     * Counterpart to Solidity's `uint128` operator.
     *
     * Requirements:
     *
     * - input must fit into 128 bits
     *
     * _Available since v2.5._
     */
    function toUint128(uint256 value) internal pure returns (uint128) {
        require(value <= type(uint128).max, "SafeCast: value doesn't fit in 128 bits");
        return uint128(value);
    }

    /**
     * @dev Returns the downcasted uint120 from uint256, reverting on
     * overflow (when the input is greater than largest uint120).
     *
     * Counterpart to Solidity's `uint120` operator.
     *
     * Requirements:
     *
     * - input must fit into 120 bits
     *
     * _Available since v4.7._
     */
    function toUint120(uint256 value) internal pure returns (uint120) {
        require(value <= type(uint120).max, "SafeCast: value doesn't fit in 120 bits");
        return uint120(value);
    }

    /**
     * @dev Returns the downcasted uint112 from uint256, reverting on
     * overflow (when the input is greater than largest uint112).
     *
     * Counterpart to Solidity's `uint112` operator.
     *
     * Requirements:
     *
     * - input must fit into 112 bits
     *
     * _Available since v4.7._
     */
    function toUint112(uint256 value) internal pure returns (uint112) {
        require(value <= type(uint112).max, "SafeCast: value doesn't fit in 112 bits");
        return uint112(value);
    }

    /**
     * @dev Returns the downcasted uint104 from uint256, reverting on
     * overflow (when the input is greater than largest uint104).
     *
     * Counterpart to Solidity's `uint104` operator.
     *
     * Requirements:
     *
     * - input must fit into 104 bits
     *
     * _Available since v4.7._
     */
    function toUint104(uint256 value) internal pure returns (uint104) {
        require(value <= type(uint104).max, "SafeCast: value doesn't fit in 104 bits");
        return uint104(value);
    }

    /**
     * @dev Returns the downcasted uint96 from uint256, reverting on
     * overflow (when the input is greater than largest uint96).
     *
     * Counterpart to Solidity's `uint96` operator.
     *
     * Requirements:
     *
     * - input must fit into 96 bits
     *
     * _Available since v4.2._
     */
    function toUint96(uint256 value) internal pure returns (uint96) {
        require(value <= type(uint96).max, "SafeCast: value doesn't fit in 96 bits");
        return uint96(value);
    }

    /**
     * @dev Returns the downcasted uint88 from uint256, reverting on
     * overflow (when the input is greater than largest uint88).
     *
     * Counterpart to Solidity's `uint88` operator.
     *
     * Requirements:
     *
     * - input must fit into 88 bits
     *
     * _Available since v4.7._
     */
    function toUint88(uint256 value) internal pure returns (uint88) {
        require(value <= type(uint88).max, "SafeCast: value doesn't fit in 88 bits");
        return uint88(value);
    }

    /**
     * @dev Returns the downcasted uint80 from uint256, reverting on
     * overflow (when the input is greater than largest uint80).
     *
     * Counterpart to Solidity's `uint80` operator.
     *
     * Requirements:
     *
     * - input must fit into 80 bits
     *
     * _Available since v4.7._
     */
    function toUint80(uint256 value) internal pure returns (uint80) {
        require(value <= type(uint80).max, "SafeCast: value doesn't fit in 80 bits");
        return uint80(value);
    }

    /**
     * @dev Returns the downcasted uint72 from uint256, reverting on
     * overflow (when the input is greater than largest uint72).
     *
     * Counterpart to Solidity's `uint72` operator.
     *
     * Requirements:
     *
     * - input must fit into 72 bits
     *
     * _Available since v4.7._
     */
    function toUint72(uint256 value) internal pure returns (uint72) {
        require(value <= type(uint72).max, "SafeCast: value doesn't fit in 72 bits");
        return uint72(value);
    }

    /**
     * @dev Returns the downcasted uint64 from uint256, reverting on
     * overflow (when the input is greater than largest uint64).
     *
     * Counterpart to Solidity's `uint64` operator.
     *
     * Requirements:
     *
     * - input must fit into 64 bits
     *
     * _Available since v2.5._
     */
    function toUint64(uint256 value) internal pure returns (uint64) {
        require(value <= type(uint64).max, "SafeCast: value doesn't fit in 64 bits");
        return uint64(value);
    }

    /**
     * @dev Returns the downcasted uint56 from uint256, reverting on
     * overflow (when the input is greater than largest uint56).
     *
     * Counterpart to Solidity's `uint56` operator.
     *
     * Requirements:
     *
     * - input must fit into 56 bits
     *
     * _Available since v4.7._
     */
    function toUint56(uint256 value) internal pure returns (uint56) {
        require(value <= type(uint56).max, "SafeCast: value doesn't fit in 56 bits");
        return uint56(value);
    }

    /**
     * @dev Returns the downcasted uint48 from uint256, reverting on
     * overflow (when the input is greater than largest uint48).
     *
     * Counterpart to Solidity's `uint48` operator.
     *
     * Requirements:
     *
     * - input must fit into 48 bits
     *
     * _Available since v4.7._
     */
    function toUint48(uint256 value) internal pure returns (uint48) {
        require(value <= type(uint48).max, "SafeCast: value doesn't fit in 48 bits");
        return uint48(value);
    }

    /**
     * @dev Returns the downcasted uint40 from uint256, reverting on
     * overflow (when the input is greater than largest uint40).
     *
     * Counterpart to Solidity's `uint40` operator.
     *
     * Requirements:
     *
     * - input must fit into 40 bits
     *
     * _Available since v4.7._
     */
    function toUint40(uint256 value) internal pure returns (uint40) {
        require(value <= type(uint40).max, "SafeCast: value doesn't fit in 40 bits");
        return uint40(value);
    }

    /**
     * @dev Returns the downcasted uint32 from uint256, reverting on
     * overflow (when the input is greater than largest uint32).
     *
     * Counterpart to Solidity's `uint32` operator.
     *
     * Requirements:
     *
     * - input must fit into 32 bits
     *
     * _Available since v2.5._
     */
    function toUint32(uint256 value) internal pure returns (uint32) {
        require(value <= type(uint32).max, "SafeCast: value doesn't fit in 32 bits");
        return uint32(value);
    }

    /**
     * @dev Returns the downcasted uint24 from uint256, reverting on
     * overflow (when the input is greater than largest uint24).
     *
     * Counterpart to Solidity's `uint24` operator.
     *
     * Requirements:
     *
     * - input must fit into 24 bits
     *
     * _Available since v4.7._
     */
    function toUint24(uint256 value) internal pure returns (uint24) {
        require(value <= type(uint24).max, "SafeCast: value doesn't fit in 24 bits");
        return uint24(value);
    }

    /**
     * @dev Returns the downcasted uint16 from uint256, reverting on
     * overflow (when the input is greater than largest uint16).
     *
     * Counterpart to Solidity's `uint16` operator.
     *
     * Requirements:
     *
     * - input must fit into 16 bits
     *
     * _Available since v2.5._
     */
    function toUint16(uint256 value) internal pure returns (uint16) {
        require(value <= type(uint16).max, "SafeCast: value doesn't fit in 16 bits");
        return uint16(value);
    }

    /**
     * @dev Returns the downcasted uint8 from uint256, reverting on
     * overflow (when the input is greater than largest uint8).
     *
     * Counterpart to Solidity's `uint8` operator.
     *
     * Requirements:
     *
     * - input must fit into 8 bits
     *
     * _Available since v2.5._
     */
    function toUint8(uint256 value) internal pure returns (uint8) {
        require(value <= type(uint8).max, "SafeCast: value doesn't fit in 8 bits");
        return uint8(value);
    }

    /**
     * @dev Converts a signed int256 into an unsigned uint256.
     *
     * Requirements:
     *
     * - input must be greater than or equal to 0.
     *
     * _Available since v3.0._
     */
    function toUint256(int256 value) internal pure returns (uint256) {
        require(value >= 0, "SafeCast: value must be positive");
        return uint256(value);
    }

    /**
     * @dev Returns the downcasted int248 from int256, reverting on
     * overflow (when the input is less than smallest int248 or
     * greater than largest int248).
     *
     * Counterpart to Solidity's `int248` operator.
     *
     * Requirements:
     *
     * - input must fit into 248 bits
     *
     * _Available since v4.7._
     */
    function toInt248(int256 value) internal pure returns (int248 downcasted) {
        downcasted = int248(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 248 bits");
    }

    /**
     * @dev Returns the downcasted int240 from int256, reverting on
     * overflow (when the input is less than smallest int240 or
     * greater than largest int240).
     *
     * Counterpart to Solidity's `int240` operator.
     *
     * Requirements:
     *
     * - input must fit into 240 bits
     *
     * _Available since v4.7._
     */
    function toInt240(int256 value) internal pure returns (int240 downcasted) {
        downcasted = int240(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 240 bits");
    }

    /**
     * @dev Returns the downcasted int232 from int256, reverting on
     * overflow (when the input is less than smallest int232 or
     * greater than largest int232).
     *
     * Counterpart to Solidity's `int232` operator.
     *
     * Requirements:
     *
     * - input must fit into 232 bits
     *
     * _Available since v4.7._
     */
    function toInt232(int256 value) internal pure returns (int232 downcasted) {
        downcasted = int232(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 232 bits");
    }

    /**
     * @dev Returns the downcasted int224 from int256, reverting on
     * overflow (when the input is less than smallest int224 or
     * greater than largest int224).
     *
     * Counterpart to Solidity's `int224` operator.
     *
     * Requirements:
     *
     * - input must fit into 224 bits
     *
     * _Available since v4.7._
     */
    function toInt224(int256 value) internal pure returns (int224 downcasted) {
        downcasted = int224(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 224 bits");
    }

    /**
     * @dev Returns the downcasted int216 from int256, reverting on
     * overflow (when the input is less than smallest int216 or
     * greater than largest int216).
     *
     * Counterpart to Solidity's `int216` operator.
     *
     * Requirements:
     *
     * - input must fit into 216 bits
     *
     * _Available since v4.7._
     */
    function toInt216(int256 value) internal pure returns (int216 downcasted) {
        downcasted = int216(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 216 bits");
    }

    /**
     * @dev Returns the downcasted int208 from int256, reverting on
     * overflow (when the input is less than smallest int208 or
     * greater than largest int208).
     *
     * Counterpart to Solidity's `int208` operator.
     *
     * Requirements:
     *
     * - input must fit into 208 bits
     *
     * _Available since v4.7._
     */
    function toInt208(int256 value) internal pure returns (int208 downcasted) {
        downcasted = int208(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 208 bits");
    }

    /**
     * @dev Returns the downcasted int200 from int256, reverting on
     * overflow (when the input is less than smallest int200 or
     * greater than largest int200).
     *
     * Counterpart to Solidity's `int200` operator.
     *
     * Requirements:
     *
     * - input must fit into 200 bits
     *
     * _Available since v4.7._
     */
    function toInt200(int256 value) internal pure returns (int200 downcasted) {
        downcasted = int200(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 200 bits");
    }

    /**
     * @dev Returns the downcasted int192 from int256, reverting on
     * overflow (when the input is less than smallest int192 or
     * greater than largest int192).
     *
     * Counterpart to Solidity's `int192` operator.
     *
     * Requirements:
     *
     * - input must fit into 192 bits
     *
     * _Available since v4.7._
     */
    function toInt192(int256 value) internal pure returns (int192 downcasted) {
        downcasted = int192(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 192 bits");
    }

    /**
     * @dev Returns the downcasted int184 from int256, reverting on
     * overflow (when the input is less than smallest int184 or
     * greater than largest int184).
     *
     * Counterpart to Solidity's `int184` operator.
     *
     * Requirements:
     *
     * - input must fit into 184 bits
     *
     * _Available since v4.7._
     */
    function toInt184(int256 value) internal pure returns (int184 downcasted) {
        downcasted = int184(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 184 bits");
    }

    /**
     * @dev Returns the downcasted int176 from int256, reverting on
     * overflow (when the input is less than smallest int176 or
     * greater than largest int176).
     *
     * Counterpart to Solidity's `int176` operator.
     *
     * Requirements:
     *
     * - input must fit into 176 bits
     *
     * _Available since v4.7._
     */
    function toInt176(int256 value) internal pure returns (int176 downcasted) {
        downcasted = int176(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 176 bits");
    }

    /**
     * @dev Returns the downcasted int168 from int256, reverting on
     * overflow (when the input is less than smallest int168 or
     * greater than largest int168).
     *
     * Counterpart to Solidity's `int168` operator.
     *
     * Requirements:
     *
     * - input must fit into 168 bits
     *
     * _Available since v4.7._
     */
    function toInt168(int256 value) internal pure returns (int168 downcasted) {
        downcasted = int168(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 168 bits");
    }

    /**
     * @dev Returns the downcasted int160 from int256, reverting on
     * overflow (when the input is less than smallest int160 or
     * greater than largest int160).
     *
     * Counterpart to Solidity's `int160` operator.
     *
     * Requirements:
     *
     * - input must fit into 160 bits
     *
     * _Available since v4.7._
     */
    function toInt160(int256 value) internal pure returns (int160 downcasted) {
        downcasted = int160(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 160 bits");
    }

    /**
     * @dev Returns the downcasted int152 from int256, reverting on
     * overflow (when the input is less than smallest int152 or
     * greater than largest int152).
     *
     * Counterpart to Solidity's `int152` operator.
     *
     * Requirements:
     *
     * - input must fit into 152 bits
     *
     * _Available since v4.7._
     */
    function toInt152(int256 value) internal pure returns (int152 downcasted) {
        downcasted = int152(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 152 bits");
    }

    /**
     * @dev Returns the downcasted int144 from int256, reverting on
     * overflow (when the input is less than smallest int144 or
     * greater than largest int144).
     *
     * Counterpart to Solidity's `int144` operator.
     *
     * Requirements:
     *
     * - input must fit into 144 bits
     *
     * _Available since v4.7._
     */
    function toInt144(int256 value) internal pure returns (int144 downcasted) {
        downcasted = int144(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 144 bits");
    }

    /**
     * @dev Returns the downcasted int136 from int256, reverting on
     * overflow (when the input is less than smallest int136 or
     * greater than largest int136).
     *
     * Counterpart to Solidity's `int136` operator.
     *
     * Requirements:
     *
     * - input must fit into 136 bits
     *
     * _Available since v4.7._
     */
    function toInt136(int256 value) internal pure returns (int136 downcasted) {
        downcasted = int136(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 136 bits");
    }

    /**
     * @dev Returns the downcasted int128 from int256, reverting on
     * overflow (when the input is less than smallest int128 or
     * greater than largest int128).
     *
     * Counterpart to Solidity's `int128` operator.
     *
     * Requirements:
     *
     * - input must fit into 128 bits
     *
     * _Available since v3.1._
     */
    function toInt128(int256 value) internal pure returns (int128 downcasted) {
        downcasted = int128(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 128 bits");
    }

    /**
     * @dev Returns the downcasted int120 from int256, reverting on
     * overflow (when the input is less than smallest int120 or
     * greater than largest int120).
     *
     * Counterpart to Solidity's `int120` operator.
     *
     * Requirements:
     *
     * - input must fit into 120 bits
     *
     * _Available since v4.7._
     */
    function toInt120(int256 value) internal pure returns (int120 downcasted) {
        downcasted = int120(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 120 bits");
    }

    /**
     * @dev Returns the downcasted int112 from int256, reverting on
     * overflow (when the input is less than smallest int112 or
     * greater than largest int112).
     *
     * Counterpart to Solidity's `int112` operator.
     *
     * Requirements:
     *
     * - input must fit into 112 bits
     *
     * _Available since v4.7._
     */
    function toInt112(int256 value) internal pure returns (int112 downcasted) {
        downcasted = int112(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 112 bits");
    }

    /**
     * @dev Returns the downcasted int104 from int256, reverting on
     * overflow (when the input is less than smallest int104 or
     * greater than largest int104).
     *
     * Counterpart to Solidity's `int104` operator.
     *
     * Requirements:
     *
     * - input must fit into 104 bits
     *
     * _Available since v4.7._
     */
    function toInt104(int256 value) internal pure returns (int104 downcasted) {
        downcasted = int104(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 104 bits");
    }

    /**
     * @dev Returns the downcasted int96 from int256, reverting on
     * overflow (when the input is less than smallest int96 or
     * greater than largest int96).
     *
     * Counterpart to Solidity's `int96` operator.
     *
     * Requirements:
     *
     * - input must fit into 96 bits
     *
     * _Available since v4.7._
     */
    function toInt96(int256 value) internal pure returns (int96 downcasted) {
        downcasted = int96(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 96 bits");
    }

    /**
     * @dev Returns the downcasted int88 from int256, reverting on
     * overflow (when the input is less than smallest int88 or
     * greater than largest int88).
     *
     * Counterpart to Solidity's `int88` operator.
     *
     * Requirements:
     *
     * - input must fit into 88 bits
     *
     * _Available since v4.7._
     */
    function toInt88(int256 value) internal pure returns (int88 downcasted) {
        downcasted = int88(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 88 bits");
    }

    /**
     * @dev Returns the downcasted int80 from int256, reverting on
     * overflow (when the input is less than smallest int80 or
     * greater than largest int80).
     *
     * Counterpart to Solidity's `int80` operator.
     *
     * Requirements:
     *
     * - input must fit into 80 bits
     *
     * _Available since v4.7._
     */
    function toInt80(int256 value) internal pure returns (int80 downcasted) {
        downcasted = int80(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 80 bits");
    }

    /**
     * @dev Returns the downcasted int72 from int256, reverting on
     * overflow (when the input is less than smallest int72 or
     * greater than largest int72).
     *
     * Counterpart to Solidity's `int72` operator.
     *
     * Requirements:
     *
     * - input must fit into 72 bits
     *
     * _Available since v4.7._
     */
    function toInt72(int256 value) internal pure returns (int72 downcasted) {
        downcasted = int72(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 72 bits");
    }

    /**
     * @dev Returns the downcasted int64 from int256, reverting on
     * overflow (when the input is less than smallest int64 or
     * greater than largest int64).
     *
     * Counterpart to Solidity's `int64` operator.
     *
     * Requirements:
     *
     * - input must fit into 64 bits
     *
     * _Available since v3.1._
     */
    function toInt64(int256 value) internal pure returns (int64 downcasted) {
        downcasted = int64(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 64 bits");
    }

    /**
     * @dev Returns the downcasted int56 from int256, reverting on
     * overflow (when the input is less than smallest int56 or
     * greater than largest int56).
     *
     * Counterpart to Solidity's `int56` operator.
     *
     * Requirements:
     *
     * - input must fit into 56 bits
     *
     * _Available since v4.7._
     */
    function toInt56(int256 value) internal pure returns (int56 downcasted) {
        downcasted = int56(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 56 bits");
    }

    /**
     * @dev Returns the downcasted int48 from int256, reverting on
     * overflow (when the input is less than smallest int48 or
     * greater than largest int48).
     *
     * Counterpart to Solidity's `int48` operator.
     *
     * Requirements:
     *
     * - input must fit into 48 bits
     *
     * _Available since v4.7._
     */
    function toInt48(int256 value) internal pure returns (int48 downcasted) {
        downcasted = int48(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 48 bits");
    }

    /**
     * @dev Returns the downcasted int40 from int256, reverting on
     * overflow (when the input is less than smallest int40 or
     * greater than largest int40).
     *
     * Counterpart to Solidity's `int40` operator.
     *
     * Requirements:
     *
     * - input must fit into 40 bits
     *
     * _Available since v4.7._
     */
    function toInt40(int256 value) internal pure returns (int40 downcasted) {
        downcasted = int40(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 40 bits");
    }

    /**
     * @dev Returns the downcasted int32 from int256, reverting on
     * overflow (when the input is less than smallest int32 or
     * greater than largest int32).
     *
     * Counterpart to Solidity's `int32` operator.
     *
     * Requirements:
     *
     * - input must fit into 32 bits
     *
     * _Available since v3.1._
     */
    function toInt32(int256 value) internal pure returns (int32 downcasted) {
        downcasted = int32(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 32 bits");
    }

    /**
     * @dev Returns the downcasted int24 from int256, reverting on
     * overflow (when the input is less than smallest int24 or
     * greater than largest int24).
     *
     * Counterpart to Solidity's `int24` operator.
     *
     * Requirements:
     *
     * - input must fit into 24 bits
     *
     * _Available since v4.7._
     */
    function toInt24(int256 value) internal pure returns (int24 downcasted) {
        downcasted = int24(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 24 bits");
    }

    /**
     * @dev Returns the downcasted int16 from int256, reverting on
     * overflow (when the input is less than smallest int16 or
     * greater than largest int16).
     *
     * Counterpart to Solidity's `int16` operator.
     *
     * Requirements:
     *
     * - input must fit into 16 bits
     *
     * _Available since v3.1._
     */
    function toInt16(int256 value) internal pure returns (int16 downcasted) {
        downcasted = int16(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 16 bits");
    }

    /**
     * @dev Returns the downcasted int8 from int256, reverting on
     * overflow (when the input is less than smallest int8 or
     * greater than largest int8).
     *
     * Counterpart to Solidity's `int8` operator.
     *
     * Requirements:
     *
     * - input must fit into 8 bits
     *
     * _Available since v3.1._
     */
    function toInt8(int256 value) internal pure returns (int8 downcasted) {
        downcasted = int8(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 8 bits");
    }

    /**
     * @dev Converts an unsigned uint256 into a signed int256.
     *
     * Requirements:
     *
     * - input must be less than or equal to maxInt256.
     *
     * _Available since v3.0._
     */
    function toInt256(uint256 value) internal pure returns (int256) {
        // Note: Unsafe cast below is okay because `type(int256).max` is guaranteed to be positive
        require(value <= uint256(type(int256).max), "SafeCast: value doesn't fit in an int256");
        return int256(value);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.20;

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

/**
 * @dev Bridge roles.
 */
abstract contract BridgeRoles is Context {
    /// @notice Only super admin can recover ETH, and rescue ERC20 tokens
    address private _superAdmin;

    /// @notice Used to perform transactions related to Bitcoin
    /// @notice wrapBTC, brc20Received, runesReceived, updateBrc20ToRunesTvls, updateRunesToBrc20Tvls
    address private _btcBridge;

    error CallerNotSuperAdmin();
    error CallerNotBtcBridge();
    error ZeroAddress();

    event SuperAdminTransferred(
        address indexed previousSuperAdmin,
        address indexed newSuperAdmin
    );

    event BtcBridgeTransferred(
        address indexed previousBridge,
        address indexed newBridge
    ); 

    /**
     * @dev Initializes the btc bridge and super admin.
     */
    constructor(address superAdmin_, address btcBridge_) {
        if (btcBridge_ == address(0) || superAdmin_ == address(0)) {
            revert ZeroAddress();
        }
        _transferSuperAdmin(superAdmin_);
        _transferBtcBridge(btcBridge_);
    }

    /// @dev Throws if called by any account other than the super admin
    modifier onlySuperAdmin() {
        _checkSuperAdmin();
        _;
    }

    /**
     * @dev Throws if called by any account other than the btc bridge.
     */
    modifier onlyBtcBridge() {
        _checkBtcBridge();
        _;
    }

    /**
     * @dev Returns the address of the current super admin.
     */
    function superAdmin() external view virtual returns (address) {
        return _superAdmin;
    }

    /**
     * @dev Returns the address of the current btc bridge.
     */
    function btcBridge() external view virtual returns (address) {
        return _btcBridge;
    }

    /**
     * @dev Throws if the sender is not the super admin.
     */
    function _checkSuperAdmin() internal view virtual {
        if (_superAdmin != _msgSender()) {
            revert CallerNotSuperAdmin();
        }
    }

    /**
     * @dev Throws if the sender is not the btc bridge.
     */
    function _checkBtcBridge() internal view virtual {
        if (_btcBridge != _msgSender()) {
            revert CallerNotBtcBridge();
        }
    }

    /**
     * @dev Transfers super admin to a new account (`newSuperAdmin`).
     * Can only be called by the current btc bridge.
     */
    function transferSuperAdmin(
        address newSuperAdmin
    ) external virtual onlySuperAdmin {
        if (newSuperAdmin == address(0)) {
            revert ZeroAddress();
        }
        _transferSuperAdmin(newSuperAdmin);
    }

    /**
     * @dev Transfers btc bridge to a new account (`newBtcBridge`).
     * Can only be called by the current btc bridge.
     */
    function transferBtcBridge(
        address newBtcBridge
    ) external virtual onlyBtcBridge {
        if (newBtcBridge == address(0)) {
            revert ZeroAddress();
        }
        _transferBtcBridge(newBtcBridge);
    }

    /**
     * @dev Transfers super admin to a new account (`newSuperAdmin`).
     * Internal function without access restriction.
     */
    function _transferSuperAdmin(address newSuperAdmin) internal virtual {
        address oldSuperAdmin = _superAdmin;
        _superAdmin = newSuperAdmin;
        emit SuperAdminTransferred(oldSuperAdmin, newSuperAdmin);
    }

    /**
     * @dev Transfers btc bridge to a new account (`newBtcBridge`).
     * Internal function without access restriction.
     */
    function _transferBtcBridge(address newBtcBridge) internal virtual {
        address oldBtcBridge = _btcBridge;
        _btcBridge = newBtcBridge;
        emit BtcBridgeTransferred(oldBtcBridge, newBtcBridge);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

// solhint-disable-next-line interface-starts-with-i
interface AggregatorV3Interface {

  function decimals() external view returns (uint8);

  function description() external view returns (string memory);
  
  function version() external view returns (uint256);

  // getRoundData and latestRoundData should both raise "No data present"
  // if they do not have data to report, instead of returning unset values
  // which could be misinterpreted as actual reported values.
  function getRoundData(uint80 _roundId)
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

/**
 * @title Mintalbe and Burnable token interface
 * @author Beyond
 */
interface IMintableBurnable {
    function mint(address to, uint256 amount) external;

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

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

/// @title Interface for WETH and other wrapped native gas tokens (e.g., WBNB, WAVAX, etc.)
interface IWETH {
    /// @notice Deposit ether to get wrapped ether
    function deposit() external payable;

    /// @notice Withdraw wrapped ether to get ether
    function withdraw(uint) external;

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

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity ^0.8.20;

/// @title Function for getting the current chain ID
library ChainId {
    /// @dev Gets the current chain ID
    /// @return chainId The current chain ID
    function get() internal view returns (uint256 chainId) {
        assembly {
            chainId := chainid()
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import {ReentrancyGuard} from "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import {OApp, MessagingFee} from "@layerzerolabs/oapp-evm/contracts/oapp/OApp.sol";
import {MessagingParams, MessagingReceipt} from "@layerzerolabs/lz-evm-protocol-v2/contracts/interfaces/ILayerZeroEndpointV2.sol";
import {SafeCast} from "@openzeppelin/contracts/utils/math/SafeCast.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import {BridgeRoles} from "./access/BridgeRoles.sol";
import {AggregatorV3Interface} from "./interfaces/AggregatorV3Interface.sol";

/**
 * @title TokenBridgeBase
 * @notice An abstract contract containing a common functionality used by OriginalTokenBridge and WrappedTokenBridge
 */
abstract contract TokenBridgeBase is BridgeRoles, OApp, ReentrancyGuard {
    using SafeCast for int256;
    using SafeERC20 for IERC20;

    /// @notice A packet type used to identify messages requesting minting of wrapped tokens
    uint8 public constant PT_MINT = 0;

    /// @notice A packet type used to identify messages requesting unlocking of original tokens
    uint8 public constant PT_UNLOCK = 1;

    // Enum representing token type
    enum TokenType {
        ERC20,
        BRC20,
        RUNES
    }

    /// @notice Tokens that are paused
    mapping(address => bool) public pausedTokens;

    /// @notice Tokens that are registered as protocol tokens
    mapping(address => bool) public protocolTokens;

    /// @notice Global pause state
    bool public globalPaused;

    /// @notice Chainlink data feed(BTC / USD)
    AggregatorV3Interface internal btcDataFeed;

    /// @notice Chainlink data feed(Native Currency / USD)
    AggregatorV3Interface internal nativeDataFeed;

    /// @notice brc-20 transfer total fee in satoshi
    uint256 public brc20TransferFee;

    /// @notice runes transfer total fee in satoshi
    uint256 public runesTransferFee;

    /// @notice bitcoin transfer total fee in satoshi
    uint256 public btcTransferFee;

    /// @notice Decimals of native currency
    uint8 internal nativeDecimals;

    // define custom errors
    error InvalidWethAddress();
    error InsufficientValueSent();
    error InvalidTokenAddress();
    error TokenRegistered();
    error InvalidTick();
    error UnsupportedToken();
    error InsufficientFee();
    error InvalidRefundAddress();
    error InvalidTo();
    error InvalidAmount();
    error Paused();
    error UnknownPacketType();
    error InvalidBtcReceiver();
    error InsufficientLiquidity();
    error UnsupportedBrc20();
    error UnsupportedRunes();
    error InvalidTxId();
    error TxIdBeenUsed();
    error RecoverETHFailed();
    error InvalidRemoteTokenAddress();
    error CanNotBridgedToBrc20();
    error CanNotBridgedToRunes();
    error UnlockETHFail();
    error CanRescueNonProtocolTokens();
    error AlreadyWrapped();
    error AlreadyUnwrapped();

    event SetGlobalPause(bool paused);
    event SetTokenPause(address token, bool paused);
    event Withdraw(address indexed to, address indexed token, uint256 amount);
    // event of contract
    event WithdrawCoins(address indexed sender, uint256 amount);
    event Brc20TransferFeeSet(uint256 brc20TransferFee);
    event RunesTransferFeeSet(uint256 runesTransferFee);
    event BtcTransferFeeSet(uint256 btcTransferFee);

    modifier whenNotPaused(address _token) {
        if (globalPaused || pausedTokens[_token]) {
            revert Paused();
        }
        _;
    }

    /**
     * @notice Constructor
     * @param _endpoint LayerZero endpoint
     * @param _delegate The delegate capable of making OApp configurations inside of the endpoint
     * @param _btcBridge the btc bridge address
     * @param _superAdmin the super admin address
     * @param _btcDataFeed Chainlink BTC/USD price feed
     * @param _nativeDataFeed Chainlink Native/USD price feed
     * @param _nativeDecimals Decimals of the native currency
     */
    constructor(
        address _endpoint,
        address _delegate,
        address _btcBridge,
        address _superAdmin,
        address _btcDataFeed,
        address _nativeDataFeed,
        uint8 _nativeDecimals
    ) BridgeRoles(_superAdmin, _btcBridge) OApp(_endpoint, _delegate) {
        btcDataFeed = AggregatorV3Interface(_btcDataFeed);
        nativeDataFeed = AggregatorV3Interface(_nativeDataFeed);
        nativeDecimals = _nativeDecimals;
    }

    // External functions

    /**
     * @notice Sets the global pause state
     * @param _paused The pause state
     */
    function setGlobalPause(bool _paused) external onlyOwner {
        globalPaused = _paused;
        emit SetGlobalPause(_paused);
    }

    /**
     * @notice Sets the pause state for a specific token
     * @param _token the token address
     * @param _paused the pause state
     */
    function setTokenPause(address _token, bool _paused) external onlyOwner {
        pausedTokens[_token] = _paused;
        emit SetTokenPause(_token, _paused);
    }

    /**
     * @notice Withdraws the specified amount of native currency
     * @param amount The amount of token to transfer
     */
    function recoverETH(uint256 amount) external onlySuperAdmin {
        uint256 balance = address(this).balance;
        if (amount > balance) {
            revert InvalidAmount();
        }
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, ) = _msgSender().call{value: amount}("");
        if (!success) {
            revert RecoverETHFailed();
        }
        emit WithdrawCoins(_msgSender(), amount);
    }

    /**
     * @notice Rescue ERC20 tokens sent to contract by mistake (Only non-protocol tokens can rescue).
     * @param token The address of the token
     * @param to The address of the recipient
     * @param amount The amount of token to transfer
     */
    function rescueTokens(
        address token,
        address to,
        uint256 amount
    ) external onlySuperAdmin {
        if (protocolTokens[token]) {
            revert CanRescueNonProtocolTokens();
        }
        IERC20(token).safeTransfer(to, amount);
        emit Withdraw(to, token, amount);
    }

    /**
     * @notice Set transfer fee for BRC-20
     * @param _brc20TransferFee Transfer fee for BRC-20 in satoshi
     */
    function setBrc20TransferFee(uint256 _brc20TransferFee) external onlyOwner {
        brc20TransferFee = _brc20TransferFee;
        emit Brc20TransferFeeSet(_brc20TransferFee);
    }

    /**
     * @notice Set transfer fee for Runes
     * @param _runesTransferFee Transfer fee for Runes in satoshi
     */
    function setRunesTransferFee(uint256 _runesTransferFee) external onlyOwner {
        runesTransferFee = _runesTransferFee;
        emit RunesTransferFeeSet(_runesTransferFee);
    }

    /**
     * @notice Set transfer fee for BTC
     * @param _btcTransferFee Transfer fee for BTC in satoshi
     */
    function setBtcTransferFee(uint256 _btcTransferFee) external onlyOwner {
        btcTransferFee = _btcTransferFee;
        emit BtcTransferFeeSet(_btcTransferFee);
    }

    // Public functions

    /**
     * @notice Returns the BRC-20/Runes/Bitcoin transfer fee in native currency
     * @param transferFeeInSatoshi The transfer fee in satoshi (btcTransferFee, brc20TransferFee, runesTransferFee)
     */
    function getBitcoinTransferFeeInNative(
        uint256 transferFeeInSatoshi
    ) public view returns (uint256) {
        // BTC / USD
        int btcAnswer = getChainlinkDataFeedLatestAnswer(btcDataFeed);
        // Native Currency / USD
        int nativeAnswer = getChainlinkDataFeedLatestAnswer(nativeDataFeed);
        return
            ((transferFeeInSatoshi *
                btcAnswer.toUint256() *
                (10 ** nativeDecimals)) / 10 ** 8) / nativeAnswer.toUint256();
    }

    /// @dev Overrides the renounce ownership logic inherited from openZeppelin `Ownable`
    function renounceOwnership() public override onlyOwner {}

    // Internal functions

    /**
     * Returns the latest answer
     * @param dataFeed Chainlink data feed
     * @return answer The latest answer
     */
    function getChainlinkDataFeedLatestAnswer(
        AggregatorV3Interface dataFeed
    ) internal view returns (int) {
        // prettier-ignore
        (
            /* uint80 roundId */,
            int answer,
            /* uint startedAt */,
            /* uint updatedAt */,
            /* uint80 answeredInRound */
        ) = dataFeed.latestRoundData();
        return answer;
    }

    /**
     * @dev Internal function to interact with the LayerZero EndpointV2.send() for sending a message.
     * @param _dstEid The destination endpoint ID.
     * @param _message The message payload.
     * @param _options Additional options for the message.
     * @param _fee The calculated LayerZero fee for the message.
     *      - nativeFee: The native fee.
     *      - lzTokenFee: The lzToken fee.
     * @param _refundAddress The address to receive any excess fee values sent to the endpoint.
     * @return receipt The receipt for the sent message.
     *      - guid: The unique identifier for the sent message.
     *      - nonce: The nonce of the sent message.
     *      - fee: The LayerZero fee incurred for the message.
     */
    function _lzSend(
        uint32 _dstEid,
        bytes memory _message,
        bytes memory _options,
        MessagingFee memory _fee,
        address _refundAddress
    ) internal override returns (MessagingReceipt memory receipt) {
        // @dev Push corresponding fees to the endpoint, any excess is sent back to the _refundAddress from the endpoint.
        return
            // solhint-disable-next-line check-send-result
            endpoint.send{value: _fee.nativeFee}(
                MessagingParams(
                    _dstEid,
                    _getPeerOrRevert(_dstEid),
                    _message,
                    _options,
                    _fee.lzTokenFee > 0
                ),
                _refundAddress
            );
    }
}

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

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

-----Decoded View---------------
Arg [0] : _weth (address): 0x7b79995e5f793A07Bc00c21412e50Ecae098E7f9
Arg [1] : _bBTC (address): 0x117befc485F6D2806Abf13Ad878588393a2eF82b
Arg [2] : _endpoint (address): 0x6EDCE65403992e310A62460808c4b910D972f10f
Arg [3] : _delegate (address): 0xB6A2E5C473f48142A7F2143BAc4A4744635D1fe1
Arg [4] : _btcBridge (address): 0xB6A2E5C473f48142A7F2143BAc4A4744635D1fe1
Arg [5] : _superAdmin (address): 0xB6A2E5C473f48142A7F2143BAc4A4744635D1fe1
Arg [6] : _btcDataFeed (address): 0x1b44F3514812d835EB1BDB0acB33d3fA3351Ee43
Arg [7] : _nativeDataFeed (address): 0x694AA1769357215DE4FAC081bf1f309aDC325306
Arg [8] : _nativeDecimals (uint8): 18

-----Encoded View---------------
9 Constructor Arguments found :
Arg [0] : 0000000000000000000000007b79995e5f793a07bc00c21412e50ecae098e7f9
Arg [1] : 000000000000000000000000117befc485f6d2806abf13ad878588393a2ef82b
Arg [2] : 0000000000000000000000006edce65403992e310a62460808c4b910d972f10f
Arg [3] : 000000000000000000000000b6a2e5c473f48142a7f2143bac4a4744635d1fe1
Arg [4] : 000000000000000000000000b6a2e5c473f48142a7f2143bac4a4744635d1fe1
Arg [5] : 000000000000000000000000b6a2e5c473f48142a7f2143bac4a4744635d1fe1
Arg [6] : 0000000000000000000000001b44f3514812d835eb1bdb0acb33d3fa3351ee43
Arg [7] : 000000000000000000000000694aa1769357215de4fac081bf1f309adc325306
Arg [8] : 0000000000000000000000000000000000000000000000000000000000000012