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// SPDX-License-Identifier: MIT

pragma experimental ABIEncoderV2;
pragma solidity ^0.8.0;

import {SafeMathUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/math/SafeMathUpgradeable.sol";
import {IERC20MetadataUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
import {AddressUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol";
import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import {PausableUpgradeable} from "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
import {ReentrancyGuardUpgradeable} from "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";

import {IERC20ExtensionsUpgradeable} from "./IERC20ExtensionsUpgradeable.sol";

/* solhint-disable custom-errors */
contract FxBridgeMigrateLogic is
    ReentrancyGuardUpgradeable,
    OwnableUpgradeable,
    PausableUpgradeable
{
    using SafeMathUpgradeable for uint256;
    using SafeERC20Upgradeable for IERC20MetadataUpgradeable;
    using AddressUpgradeable for address;
    /* solhint-disable var-name-mixedcase */
    bytes32 public state_fxBridgeId;
    uint256 public state_powerThreshold;

    uint256 public state_lastEventNonce;
    bytes32 public state_lastOracleSetCheckpoint;
    uint256 public state_lastOracleSetNonce;
    mapping(address => uint256) public state_lastBatchNonces;
    address[] public bridgeTokens;
    mapping(address => TokenStatus) public tokenStatus;
    string public version;

    struct TokenStatus {
        bool isOriginated;
        bool isActive;
        bool isExist;
    }

    struct TransferInfo {
        uint256 amount;
        address destination;
        uint256 fee;
        address exchange;
        uint256 minExchange;
    }

    struct BridgeToken {
        address addr;
        string name;
        string symbol;
        uint8 decimals;
    }

    /* =============== INIT =============== */

    function init(
        bytes32 _fxBridgeId,
        uint256 _powerThreshold,
        uint256 _lastEventNonce,
        bytes32 _lastOracleSetCheckpoint,
        uint256 _lastOracleSetNonce,
        address[] memory _bridgeTokens,
        uint256[] memory _lastBatchNonces,
        TokenStatus[] memory _tokenStatuses
    ) public initializer {
        __Pausable_init();
        __Ownable_init();
        __ReentrancyGuard_init();
        require(
            _lastBatchNonces.length == _bridgeTokens.length &&
                _bridgeTokens.length == _tokenStatuses.length,
            "Malformed last batch token information."
        );
        state_fxBridgeId = _fxBridgeId;
        state_powerThreshold = _powerThreshold;
        state_lastEventNonce = _lastEventNonce;
        state_lastOracleSetCheckpoint = _lastOracleSetCheckpoint;
        state_lastOracleSetNonce = _lastOracleSetNonce;
        for (uint256 i = 0; i < _bridgeTokens.length; i++) {
            bridgeTokens.push(_bridgeTokens[i]);
            state_lastBatchNonces[_bridgeTokens[i]] = _lastBatchNonces[i];
            tokenStatus[_bridgeTokens[i]] = _tokenStatuses[i];
        }
        version = "1.0.0";
    }

    /* =============== MUTATIVE FUNCTIONS  =============== */

    function addBridgeToken(
        address _tokenAddr,
        bytes32 _channelIBC,
        bool _isOriginated
    ) public onlyOwner returns (bool) {
        require(_tokenAddr != address(0), "Invalid token address");
        require(
            tokenStatus[_tokenAddr].isExist == false,
            "Bridge token already exists"
        );
        _handlerAddBridgeToken(
            _tokenAddr,
            TokenStatus(_isOriginated, true, true)
        );
        emit AddBridgeTokenEvent(
            _tokenAddr,
            IERC20MetadataUpgradeable(_tokenAddr).name(),
            IERC20MetadataUpgradeable(_tokenAddr).symbol(),
            IERC20MetadataUpgradeable(_tokenAddr).decimals(),
            state_lastEventNonce,
            _channelIBC
        );
        return true;
    }

    function _handlerAddBridgeToken(
        address _tokenAddr,
        TokenStatus memory _tokenStatus
    ) internal {
        bridgeTokens.push(_tokenAddr);
        tokenStatus[_tokenAddr] = _tokenStatus;
        state_lastEventNonce = state_lastEventNonce.add(1);
    }

    function pauseBridgeToken(
        address _tokenAddr
    ) public onlyOwner returns (bool) {
        require(
            tokenStatus[_tokenAddr].isExist == true,
            "Bridge token doesn't exists"
        );
        require(
            tokenStatus[_tokenAddr].isActive == true,
            "Bridge token already paused"
        );
        tokenStatus[_tokenAddr].isActive = false;
        return true;
    }

    function activeBridgeToken(
        address _tokenAddr
    ) public onlyOwner returns (bool) {
        require(
            tokenStatus[_tokenAddr].isExist == true,
            "Bridge token doesn't exists"
        );
        require(
            tokenStatus[_tokenAddr].isActive == false,
            "Bridge token already actived"
        );
        tokenStatus[_tokenAddr].isActive = true;
        return true;
    }

    function updateOracleSet(
        address[] memory _newOracles,
        uint256[] memory _newPowers,
        uint256 _newOracleSetNonce,
        address[] memory _currentOracles,
        uint256[] memory _currentPowers,
        uint256 _currentOracleSetNonce,
        uint8[] memory _v,
        bytes32[] memory _r,
        bytes32[] memory _s
    ) public whenNotPaused {
        require(
            _newOracleSetNonce > _currentOracleSetNonce,
            "New oracle set nonce must be greater than the current nonce"
        );

        require(
            _newOracles.length == _newPowers.length,
            "Malformed new oracle set"
        );

        require(
            _currentOracles.length == _currentPowers.length &&
                _currentOracles.length == _v.length &&
                _currentOracles.length == _r.length &&
                _currentOracles.length == _s.length,
            "Malformed current oracle set"
        );

        require(
            makeCheckpoint(
                _currentOracles,
                _currentPowers,
                _currentOracleSetNonce,
                state_fxBridgeId
            ) == state_lastOracleSetCheckpoint,
            "Supplied current oracles and powers do not match checkpoint."
        );

        bytes32 newCheckpoint = makeCheckpoint(
            _newOracles,
            _newPowers,
            _newOracleSetNonce,
            state_fxBridgeId
        );

        checkOracleSignatures(
            _currentOracles,
            _currentPowers,
            _v,
            _r,
            _s,
            newCheckpoint,
            state_powerThreshold
        );

        state_lastOracleSetCheckpoint = newCheckpoint;

        state_lastOracleSetNonce = _newOracleSetNonce;

        state_lastEventNonce = state_lastEventNonce.add(1);
        emit OracleSetUpdatedEvent(
            _newOracleSetNonce,
            state_lastEventNonce,
            _newOracles,
            _newPowers
        );
    }

    function sendToFx(
        address _tokenContract,
        bytes32 _destination,
        bytes32 _targetIBC,
        uint256 _amount
    ) public payable nonReentrant whenNotPaused {
        require(_amount > 0, "amount should be greater than zero ");
        TokenStatus memory _tokenStatus = tokenStatus[_tokenContract];
        require(_tokenStatus.isExist, "Unsupported token address");
        require(_tokenStatus.isActive, "token was paused");

        IERC20MetadataUpgradeable(_tokenContract).safeTransferFrom(
            msg.sender,
            address(this),
            _amount
        );
        if (_tokenStatus.isOriginated == true) {
            IERC20ExtensionsUpgradeable(_tokenContract).burn(_amount);
        }

        state_lastEventNonce = state_lastEventNonce.add(1);
        emit SendToFxEvent(
            _tokenContract,
            msg.sender,
            _destination,
            _targetIBC,
            _amount,
            state_lastEventNonce
        );
    }

    function submitBatch(
        address[] memory _currentOracles,
        uint256[] memory _currentPowers,
        uint8[] memory _v,
        bytes32[] memory _r,
        bytes32[] memory _s,
        uint256[] memory _amounts,
        address[] memory _destinations,
        uint256[] memory _fees,
        uint256[2] memory _nonceArray,
        address _tokenContract,
        uint256 _batchTimeout,
        address _feeReceive
    ) public nonReentrant whenNotPaused {
        {
            TokenStatus memory _tokenStatus = tokenStatus[_tokenContract];
            require(_tokenStatus.isExist, "Unsupported token address");
            require(_tokenStatus.isActive, "Token was paused");

            require(
                state_lastBatchNonces[_tokenContract] < _nonceArray[1],
                "New batch nonce must be greater than the current nonce."
            );

            require(
                block.number < _batchTimeout,
                "Batch timeout must be greater than the current block height."
            );

            require(
                _currentOracles.length == _currentPowers.length &&
                    _currentOracles.length == _v.length &&
                    _currentOracles.length == _r.length &&
                    _currentOracles.length == _s.length,
                "Malformed current oracle set."
            );

            require(
                makeCheckpoint(
                    _currentOracles,
                    _currentPowers,
                    _nonceArray[0],
                    state_fxBridgeId
                ) == state_lastOracleSetCheckpoint,
                "Supplied current oracles and powers do not match checkpoint."
            );

            require(
                _amounts.length == _destinations.length &&
                    _amounts.length == _fees.length,
                "Malformed batch of transactions."
            );

            checkOracleSignatures(
                _currentOracles,
                _currentPowers,
                _v,
                _r,
                _s,
                keccak256(
                    abi.encode(
                        state_fxBridgeId,
                        // bytes32 encoding of "transactionBatch"
                        0x7472616e73616374696f6e426174636800000000000000000000000000000000,
                        _amounts,
                        _destinations,
                        _fees,
                        _nonceArray[1],
                        _tokenContract,
                        _batchTimeout,
                        _feeReceive
                    )
                ),
                state_powerThreshold
            );

            state_lastBatchNonces[_tokenContract] = _nonceArray[1];

            {
                uint256 totalFee;
                for (uint256 i = 0; i < _amounts.length; i++) {
                    totalFee = totalFee.add(_fees[i]);
                    if (_tokenStatus.isOriginated == true) {
                        IERC20ExtensionsUpgradeable(_tokenContract).mint(
                            address(this),
                            _amounts[i]
                        );
                    }
                    IERC20MetadataUpgradeable(_tokenContract).safeTransfer(
                        _destinations[i],
                        _amounts[i]
                    );
                }

                if (_tokenStatus.isOriginated == true) {
                    IERC20ExtensionsUpgradeable(_tokenContract).mint(
                        address(this),
                        totalFee
                    );
                }
                IERC20MetadataUpgradeable(_tokenContract).safeTransfer(
                    _feeReceive,
                    totalFee
                );
            }
        }

        {
            state_lastEventNonce = state_lastEventNonce.add(1);
            emit TransactionBatchExecutedEvent(
                _nonceArray[1],
                _tokenContract,
                state_lastEventNonce
            );
        }
    }

    function transferOwner(
        address _token,
        address _newOwner
    ) public onlyOwner returns (bool) {
        IERC20ExtensionsUpgradeable(_token).transferOwnership(_newOwner);
        emit TransferOwnerEvent(_token, _newOwner);
        return true;
    }

    /* =============== QUERY FUNCTIONS =============== */

    function lastBatchNonce(
        address _erc20Address
    ) public view returns (uint256) {
        return state_lastBatchNonces[_erc20Address];
    }

    function checkAssetStatus(address _tokenAddr) public view returns (bool) {
        return tokenStatus[_tokenAddr].isExist;
    }

    /* ============== HELP FUNCTIONS =============== */

    function verifySig(
        address _signer,
        bytes32 _theHash,
        uint8 _v,
        bytes32 _r,
        bytes32 _s
    ) private pure returns (bool) {
        bytes32 messageDigest = keccak256(
            abi.encodePacked("\x19Ethereum Signed Message:\n32", _theHash)
        );
        return _signer == ecrecover(messageDigest, _v, _r, _s);
    }

    function makeCheckpoint(
        address[] memory _oracles,
        uint256[] memory _powers,
        uint256 _oracleSetNonce,
        bytes32 _fxBridgeId
    ) public pure returns (bytes32) {
        // bytes32 encoding of the string "checkpoint"
        bytes32 methodName = 0x636865636b706f696e7400000000000000000000000000000000000000000000;
        return
            keccak256(
                abi.encode(
                    _fxBridgeId,
                    methodName,
                    _oracleSetNonce,
                    _oracles,
                    _powers
                )
            );
    }

    function checkOracleSignatures(
        address[] memory _currentOracles,
        uint256[] memory _currentPowers,
        uint8[] memory _v,
        bytes32[] memory _r,
        bytes32[] memory _s,
        bytes32 _theHash,
        uint256 _powerThreshold
    ) public pure {
        uint256 cumulativePower = 0;

        for (uint256 i = 0; i < _currentOracles.length; i++) {
            if (_v[i] != 0) {
                require(
                    verifySig(
                        _currentOracles[i],
                        _theHash,
                        _v[i],
                        _r[i],
                        _s[i]
                    ),
                    "Oracle signature does not match."
                );
                cumulativePower = cumulativePower + _currentPowers[i];
                if (cumulativePower > _powerThreshold) {
                    break;
                }
            }
        }

        require(
            cumulativePower > _powerThreshold,
            "Submitted oracle set signatures do not have enough power."
        );
    }

    function pause() public onlyOwner whenNotPaused {
        _pause();
    }

    function unpause() public onlyOwner whenPaused {
        _unpause();
    }

    function getBridgeTokenList() public view returns (BridgeToken[] memory) {
        BridgeToken[] memory result = new BridgeToken[](bridgeTokens.length);
        for (uint256 i = 0; i < bridgeTokens.length; i++) {
            address _tokenAddr = address(bridgeTokens[i]);
            BridgeToken memory bridgeToken = BridgeToken(
                _tokenAddr,
                IERC20MetadataUpgradeable(_tokenAddr).name(),
                IERC20MetadataUpgradeable(_tokenAddr).symbol(),
                IERC20MetadataUpgradeable(_tokenAddr).decimals()
            );
            result[i] = bridgeToken;
        }
        return result;
    }

    /* =============== EVENTS =============== */

    event TransactionBatchExecutedEvent(
        uint256 indexed _batchNonce,
        address indexed _token,
        uint256 _eventNonce
    );
    event SendToFxEvent(
        address indexed _tokenContract,
        address indexed _sender,
        bytes32 indexed _destination,
        bytes32 _targetIBC,
        uint256 _amount,
        uint256 _eventNonce
    );
    event AddBridgeTokenEvent(
        address indexed _tokenContract,
        string _name,
        string _symbol,
        uint8 _decimals,
        uint256 _eventNonce,
        bytes32 _channelIBC
    );
    event OracleSetUpdatedEvent(
        uint256 indexed _newOracleSetNonce,
        uint256 _eventNonce,
        address[] _oracles,
        uint256[] _powers
    );
    event TransferOwnerEvent(address _token, address _newOwner);
}

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

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.1) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

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

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

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

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

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

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

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

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

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

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

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

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

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

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

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    function __Pausable_init() internal onlyInitializing {
        __Pausable_init_unchained();
    }

    function __Pausable_init_unchained() internal onlyInitializing {
        _paused = false;
    }

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol)

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

/**
 * @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 ReentrancyGuardUpgradeable is Initializable {
    // 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;

    function __ReentrancyGuard_init() internal onlyInitializing {
        __ReentrancyGuard_init_unchained();
    }

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-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.
 */
interface IERC20PermitUpgradeable {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    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 v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

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

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

    function safeTransfer(
        IERC20Upgradeable token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20Upgradeable token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

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

    function safeIncreaseAllowance(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20PermitUpgradeable token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [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://diligence.consensys.net/posts/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/v0.5.11/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 Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMathUpgradeable {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IERC20ExtensionsUpgradeable {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) external;

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     */
    function mint(address account, uint256 amount) external;

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) external;
}

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

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_tokenContract","type":"address"},{"indexed":false,"internalType":"string","name":"_name","type":"string"},{"indexed":false,"internalType":"string","name":"_symbol","type":"string"},{"indexed":false,"internalType":"uint8","name":"_decimals","type":"uint8"},{"indexed":false,"internalType":"uint256","name":"_eventNonce","type":"uint256"},{"indexed":false,"internalType":"bytes32","name":"_channelIBC","type":"bytes32"}],"name":"AddBridgeTokenEvent","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint8","name":"version","type":"uint8"}],"name":"Initialized","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"_newOracleSetNonce","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"_eventNonce","type":"uint256"},{"indexed":false,"internalType":"address[]","name":"_oracles","type":"address[]"},{"indexed":false,"internalType":"uint256[]","name":"_powers","type":"uint256[]"}],"name":"OracleSetUpdatedEvent","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_tokenContract","type":"address"},{"indexed":true,"internalType":"address","name":"_sender","type":"address"},{"indexed":true,"internalType":"bytes32","name":"_destination","type":"bytes32"},{"indexed":false,"internalType":"bytes32","name":"_targetIBC","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"_amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"_eventNonce","type":"uint256"}],"name":"SendToFxEvent","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"_batchNonce","type":"uint256"},{"indexed":true,"internalType":"address","name":"_token","type":"address"},{"indexed":false,"internalType":"uint256","name":"_eventNonce","type":"uint256"}],"name":"TransactionBatchExecutedEvent","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"_token","type":"address"},{"indexed":false,"internalType":"address","name":"_newOwner","type":"address"}],"name":"TransferOwnerEvent","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"inputs":[{"internalType":"address","name":"_tokenAddr","type":"address"}],"name":"activeBridgeToken","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenAddr","type":"address"},{"internalType":"bytes32","name":"_channelIBC","type":"bytes32"},{"internalType":"bool","name":"_isOriginated","type":"bool"}],"name":"addBridgeToken","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"bridgeTokens","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenAddr","type":"address"}],"name":"checkAssetStatus","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"_currentOracles","type":"address[]"},{"internalType":"uint256[]","name":"_currentPowers","type":"uint256[]"},{"internalType":"uint8[]","name":"_v","type":"uint8[]"},{"internalType":"bytes32[]","name":"_r","type":"bytes32[]"},{"internalType":"bytes32[]","name":"_s","type":"bytes32[]"},{"internalType":"bytes32","name":"_theHash","type":"bytes32"},{"internalType":"uint256","name":"_powerThreshold","type":"uint256"}],"name":"checkOracleSignatures","outputs":[],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"getBridgeTokenList","outputs":[{"components":[{"internalType":"address","name":"addr","type":"address"},{"internalType":"string","name":"name","type":"string"},{"internalType":"string","name":"symbol","type":"string"},{"internalType":"uint8","name":"decimals","type":"uint8"}],"internalType":"struct FxBridgeMigrateLogic.BridgeToken[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_fxBridgeId","type":"bytes32"},{"internalType":"uint256","name":"_powerThreshold","type":"uint256"},{"internalType":"uint256","name":"_lastEventNonce","type":"uint256"},{"internalType":"bytes32","name":"_lastOracleSetCheckpoint","type":"bytes32"},{"internalType":"uint256","name":"_lastOracleSetNonce","type":"uint256"},{"internalType":"address[]","name":"_bridgeTokens","type":"address[]"},{"internalType":"uint256[]","name":"_lastBatchNonces","type":"uint256[]"},{"components":[{"internalType":"bool","name":"isOriginated","type":"bool"},{"internalType":"bool","name":"isActive","type":"bool"},{"internalType":"bool","name":"isExist","type":"bool"}],"internalType":"struct FxBridgeMigrateLogic.TokenStatus[]","name":"_tokenStatuses","type":"tuple[]"}],"name":"init","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_erc20Address","type":"address"}],"name":"lastBatchNonce","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"_oracles","type":"address[]"},{"internalType":"uint256[]","name":"_powers","type":"uint256[]"},{"internalType":"uint256","name":"_oracleSetNonce","type":"uint256"},{"internalType":"bytes32","name":"_fxBridgeId","type":"bytes32"}],"name":"makeCheckpoint","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenAddr","type":"address"}],"name":"pauseBridgeToken","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenContract","type":"address"},{"internalType":"bytes32","name":"_destination","type":"bytes32"},{"internalType":"bytes32","name":"_targetIBC","type":"bytes32"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"sendToFx","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"state_fxBridgeId","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"state_lastBatchNonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"state_lastEventNonce","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"state_lastOracleSetCheckpoint","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"state_lastOracleSetNonce","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"state_powerThreshold","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"_currentOracles","type":"address[]"},{"internalType":"uint256[]","name":"_currentPowers","type":"uint256[]"},{"internalType":"uint8[]","name":"_v","type":"uint8[]"},{"internalType":"bytes32[]","name":"_r","type":"bytes32[]"},{"internalType":"bytes32[]","name":"_s","type":"bytes32[]"},{"internalType":"uint256[]","name":"_amounts","type":"uint256[]"},{"internalType":"address[]","name":"_destinations","type":"address[]"},{"internalType":"uint256[]","name":"_fees","type":"uint256[]"},{"internalType":"uint256[2]","name":"_nonceArray","type":"uint256[2]"},{"internalType":"address","name":"_tokenContract","type":"address"},{"internalType":"uint256","name":"_batchTimeout","type":"uint256"},{"internalType":"address","name":"_feeReceive","type":"address"}],"name":"submitBatch","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"tokenStatus","outputs":[{"internalType":"bool","name":"isOriginated","type":"bool"},{"internalType":"bool","name":"isActive","type":"bool"},{"internalType":"bool","name":"isExist","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"address","name":"_newOwner","type":"address"}],"name":"transferOwner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"_newOracles","type":"address[]"},{"internalType":"uint256[]","name":"_newPowers","type":"uint256[]"},{"internalType":"uint256","name":"_newOracleSetNonce","type":"uint256"},{"internalType":"address[]","name":"_currentOracles","type":"address[]"},{"internalType":"uint256[]","name":"_currentPowers","type":"uint256[]"},{"internalType":"uint256","name":"_currentOracleSetNonce","type":"uint256"},{"internalType":"uint8[]","name":"_v","type":"uint8[]"},{"internalType":"bytes32[]","name":"_r","type":"bytes32[]"},{"internalType":"bytes32[]","name":"_s","type":"bytes32[]"}],"name":"updateOracleSet","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"}]

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