// File: @openzeppelin/contracts/access/Ownable.sol



// 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);
    }
}

// File: @openzeppelin/contracts/security/ReentrancyGuard.sol



// 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;
    }
}

// File: @openzeppelin/contracts/token/ERC20/extensions/IERC20Permit.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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.
 */
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].
     */
    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);
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// 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);
}

// File: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol



// 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));
    }
}

// File: @openzeppelin/contracts/utils/Address.sol



// 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);
        }
    }
}

// File: @openzeppelin/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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;
    }
}

// File: contracts/bridges/SwitchAcross.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.9;

import { IAcrossSpokePool } from "../interfaces/IAcrossSpokePool.sol";
import "../lib/DataTypes.sol";
import "../core/BaseTrade.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";

contract SwitchAcross is BaseTrade, ReentrancyGuard {
    using UniversalERC20 for IERC20;
    using SafeERC20 for IERC20;
    address public acrossSpokePool;

    struct TransferArgsAcross {
        address fromToken;
        address destToken;
        address payable recipient;
        address partner;
        uint256 partnerFeeRate;
        uint256 amount;
        uint256 estimatedDstTokenAmount;
        uint256 dstChainId;
        uint256 maxCount;
        int64 relayerFeePct;
        uint32 quoteTimestamp;
        bytes32 id;
        bytes32 bridge;
        bytes message;
    }

    event AcrossSpokePoolSet(address acrossSpokePool);

    constructor(
        address _switchEventAddress,
        address _feeCollector,
        address _acrossSpokePool
    ) BaseTrade(_switchEventAddress, _feeCollector)
        public
    {
        acrossSpokePool = _acrossSpokePool;
    }

    function setAcrossSpokePool(address _acrossSpokePool) external onlyOwner {
        acrossSpokePool = _acrossSpokePool;
        emit AcrossSpokePoolSet(_acrossSpokePool);
    }

    function transferByAcross(
        TransferArgsAcross calldata transferArgs
    )
        external
        payable
        nonReentrant
    {
        require(transferArgs.amount > 0, "The amount must be greater than zero");
        require(block.chainid != transferArgs.dstChainId, "Cannot bridge to same network");

        address fromToken = transferArgs.fromToken;
        IERC20(fromToken).universalTransferFrom(msg.sender, address(this), transferArgs.amount);
        uint256 amountAfterFee = _getAmountAfterFee(IERC20(fromToken), transferArgs.amount, transferArgs.partner, transferArgs.partnerFeeRate);
        bool isNative = IERC20(fromToken).isETH();

        if (isNative) {
            fromToken = IAcrossSpokePool(acrossSpokePool).wrappedNativeToken();
        } else {
            IERC20(fromToken).universalApprove(acrossSpokePool, amountAfterFee);
        }

        IAcrossSpokePool(acrossSpokePool).deposit{ value: isNative ? amountAfterFee : 0 }(
            transferArgs.recipient,
            fromToken,
            amountAfterFee,
            transferArgs.dstChainId,
            transferArgs.relayerFeePct,
            transferArgs.quoteTimestamp,
            transferArgs.message,
            transferArgs.maxCount
        );

        _emitCrossChainTransferRequest(
            transferArgs,
            bytes32(0),
            amountAfterFee,
            msg.sender,
            DataTypes.SwapStatus.Succeeded
        );
    }

    function _emitCrossChainTransferRequest(
        TransferArgsAcross calldata transferArgs,
        bytes32 transferId,
        uint256 returnAmount,
        address sender,
        DataTypes.SwapStatus status
    ) internal {
        switchEvent.emitCrosschainSwapRequest(
            transferArgs.id,
            transferId,
            transferArgs.bridge,
            sender,
            transferArgs.fromToken,
            transferArgs.fromToken,
            transferArgs.destToken,
            transferArgs.amount,
            returnAmount,
            transferArgs.estimatedDstTokenAmount,
            status
        );
    }
}

// File: contracts/core/BaseTrade.sol



pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "../lib/UniversalERC20.sol";
import "../interfaces/ISwitchEvent.sol";
import "../interfaces/IFeeCollector.sol";

contract BaseTrade is Ownable {
    using UniversalERC20 for IERC20;
    using SafeERC20 for IERC20;
    ISwitchEvent public switchEvent;
    address public feeCollector;
    uint256 public maxPartnerFeeRate = 1000; // max partner fee rate is 10%
    uint256 public defaultSwingCut = 1500; // swing takes a cut of 15% from partner fee by default
    uint256 public constant FEE_BASE = 10000;

    event MaxPartnerFeeRateSet(uint256 maxPartnerFeeRate);
    event SwingCutSet(uint256 swingCut);
    event PartnerFeeSet(address partner, uint256 feeRate);
    event SwitchEventSet(ISwitchEvent switchEvent);
    event DefaultSwingCutSet(uint256 defaultSwingCut);

    constructor(
        address _switchEventAddress,
        address _feeCollector
    )
    public
    {
        switchEvent = ISwitchEvent(_switchEventAddress);
        feeCollector = _feeCollector;
    }

    function setMaxPartnerFeeRate(uint256 _maxPartnerFeeRate) external onlyOwner {
        require(_maxPartnerFeeRate <= 5000, "too large");
        maxPartnerFeeRate = _maxPartnerFeeRate;
        emit MaxPartnerFeeRateSet(_maxPartnerFeeRate);
    }

    function setSwitchEvent(ISwitchEvent _switchEvent) external onlyOwner {
        switchEvent = _switchEvent;
        emit SwitchEventSet(_switchEvent);
    }

    function setSwingCut(uint256 _defaultSwingCut) external onlyOwner {
        defaultSwingCut = _defaultSwingCut;
        emit DefaultSwingCutSet(_defaultSwingCut);
    }

    function getFeeInfo(
        uint256 amount,
        address partner,
        uint256 partnerFeeRate
    )
    public
    view
    returns (
        uint256 partnerFee,
        uint256 remainAmount
    )
    {
        partnerFee = partnerFeeRate * amount / FEE_BASE;
        remainAmount = amount - partnerFee;
    }

    function _getAmountAfterFee(
        IERC20 token,
        uint256 amount,
        address partner,
        uint256 partnerFeeRate
    )
    internal
    returns (
        uint256 amountAfterFee
    )
    {
        require(partnerFeeRate <= maxPartnerFeeRate, "partnerFeeRate too large");
        amountAfterFee = amount;
        if (partnerFeeRate > 0) {
            uint256 swingCut = IFeeCollector(feeCollector).getPartnerSwingCut(partner) == 0 ? defaultSwingCut : IFeeCollector(feeCollector).getPartnerSwingCut(partner);
            uint256 swingFee = partnerFeeRate * amount * swingCut / (FEE_BASE * FEE_BASE);
            uint256 partnerFee = partnerFeeRate * amount / FEE_BASE - swingFee;
            if (token.isETH()) {
                IFeeCollector(feeCollector).collectTokenFees{ value: partnerFee + swingFee }(
                    address(token),
                    partnerFee,
                    swingFee,
                    partner
                );
            } else {
                token.safeApprove(feeCollector, 0);
                token.safeApprove(feeCollector, partnerFee + swingFee);
                IFeeCollector(feeCollector).collectTokenFees(address(token), partnerFee, swingFee, partner);
            }
            amountAfterFee = amount - partnerFeeRate * amount / FEE_BASE;
        }
    }
}
// File: contracts/interfaces/IAcrossSpokePool.sol



// SPDX-License-Identifier: GPL-3.0-only
pragma solidity >=0.8.9;

/**
 * @notice Contains common data structures and functions used by all SpokePool implementations.
 */
interface IAcrossSpokePool {
    function deposit(
        address recipient, // Recipient address
        address originToken, // Address of the token
        uint256 amount, // Token amount
        uint256 destinationChainId, // ⛓ id
        int64 relayerFeePct, // see #Fees Calculation
        uint32 quoteTimestamp, // Timestamp for the quote creation
        bytes memory message, // Arbitrary data that can be used to pass additional information to the recipient along with the tokens.
        uint256 maxCount // Used to protect the depositor from frontrunning to guarantee their quote remains valid.
    ) external payable;

    function wrappedNativeToken() external view returns (address);
}

// File: contracts/interfaces/IFeeCollector.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.9;

interface IFeeCollector {
    function collectTokenFees(
        address tokenAddress,
        uint256 partnerFee,
        uint256 swingFee,
        address partnerAddress
    ) payable external;
    function getPartnerSwingCut(address partnerAddress) external view returns (uint256);
}


// File: contracts/interfaces/ISwitchEvent.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.9;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "../lib/DataTypes.sol";

interface ISwitchEvent {
    function emitSwapped(
        address from,
        address recipient,
        IERC20 fromToken,
        IERC20 destToken,
        uint256 fromAmount,
        uint256 destAmount,
        uint256 reward
    ) external;

    function emitParaswapSwapped(
        address from,
        IERC20 fromToken,
        uint256 fromAmount
    ) external;

    function emitCrosschainSwapRequest(
        bytes32 id,
        bytes32 bridgeTransferId,
        bytes32 bridge, // bridge slug
        address from, // user address
        address fromToken, // source token on sending chain
        address bridgeToken, // bridge token on sending chain
        address destToken, // dest token on receiving chain
        uint256 fromAmount, // source token amount on sending chain
        uint256 bridgeAmount, // swapped amount on sending chain
        uint256 dstAmount, // estimated amount of dest token on receiving chain
        DataTypes.SwapStatus status
    ) external;

    function emitCrosschainContractCallRequest(
        bytes32 id,
        bytes32 bridgeTransferId,
        bytes32 bridge, // bridge slug
        address from, // user address
        address toContractAddress, // The address of the contract to interact with
        address toApprovalAddress, // the approval address for contract call
        address fromToken, // source token on sending chain
        address callToken, // contract call token on receiving chain
        uint256 fromAmount, // source token amount on sending chain
        uint256 estimatedCallAmount, // estimated amount of contract call token on receiving chain
        DataTypes.ContractCallStatus status
    ) external;

    function emitCrosschainSwapDone(
        bytes32 id,
        bytes32 bridge,
        address from, // user address
        address bridgeToken, // source token on receiving chain
        address destToken, // dest token on receiving chain
        uint256 bridgeAmount, // bridge token amount on receiving chain
        uint256 destAmount, //dest token amount on receiving chain
        DataTypes.SwapStatus status
    ) external;

    function emitCrosschainContractCallDone(
        bytes32 id,
        bytes32 bridge,
        address from, // user address
        address toContractAddress, // The address of the contract to interact with
        address toApprovalAddress, // the approval address for contract call
        address bridgeToken, // source token on receiving chain
        address callToken, // call token on receiving chain
        uint256 bridgeAmount, // bridge token amount on receiving chain
        uint256 estimatedCallAmount, //dest token amount on receiving chain
        DataTypes.ContractCallStatus status
    ) external;

    function emitSingleChainContractCallDone(
        address from, // user address
        address toContractAddress, // The address of the contract to interact with
        address toApprovalAddress, // the approval address for contract call
        address fromToken, // source token on receiving chain
        address callToken, // call token on receiving chain
        uint256 fromAmount, // from token amount on receiving chain
        uint256 callAmount, //dest token amount on receiving chain
        DataTypes.ContractCallStatus status
    ) external;
}


// File: contracts/lib/DataTypes.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.9;
/**
 * @title DataTypes
 * @dev Definition of shared types
 */
library DataTypes {
    /// @notice Type for representing a swapping status type
    enum SwapStatus {
        Null,
        Succeeded,
        Failed,
        Fallback
    }

    enum ContractCallStatus {
        Null,
        Succeeded,
        Failed,
        Fallback
    }

    /// @notice Type for representing a paraswap usage status
    enum ParaswapUsageStatus {
        None,
        OnSrcChain,
        OnDestChain,
        Both
    }

    /// @notice Split Swap params
    struct SplitSwapInfo {
        uint256 amount;
        address swapContract;
        address spender;
        bytes swapData;
    }

    /// @notice Swap params
    struct SwapInfo {
        address srcToken;
        address dstToken;
    }

    struct ContractCallInfo {
        address toContractAddress; // The address of the contract to interact with.
        address toApprovalAddress; // the approval address for contract call
        address contractOutputsToken; // Some contract interactions will output a token (e.g. staking)
        uint32 toContractGasLimit; // The estimated gas used by the destination call.
        bytes toContractCallData; // The callData to be sent to the contract for the interaction on the destination chain.
    }

    struct ContractCallRequest {
        bytes32 id;
        bytes32 bridge;
        address srcToken;
        address bridgeToken;
        address callToken;
        address recipient;
        uint256 srcAmount;
        uint256 bridgeDstAmount;
        uint256 estimatedCallAmount;
        uint256[] dstDistribution;
        bytes dstParaswapData;
        ContractCallInfo callInfo;
        ParaswapUsageStatus paraswapUsageStatus;
    }
}

// File: contracts/lib/UniversalERC20.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.9;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

library UniversalERC20 {

    using SafeERC20 for IERC20;

    address private constant ZERO_ADDRESS = address(0x0000000000000000000000000000000000000000);
    address private constant ETH_ADDRESS = address(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);

    function universalTransfer(
        IERC20 token,
        address to,
        uint256 amount
    )
        internal
        returns (bool)
    {
        if (amount == 0) {
            return true;
        }
        if (isETH(token)) {
            payable(to).transfer(amount);
            return true;
        } else {
            token.safeTransfer(to, amount);
            return true;
        }
    }

    function universalTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 amount
    )
        internal
    {
        if (amount == 0) {
            return;
        }

        if (isETH(token)) {
            require(from == msg.sender && msg.value >= amount, "Wrong useage of ETH.universalTransferFrom()");
            if (to != address(this)) {
                payable(to).transfer(amount);
            }
            // commented following lines for passing celer fee properly.
//            if (msg.value > amount) {
//                payable(msg.sender).transfer(msg.value - amount);
//            }
        } else {
            token.safeTransferFrom(from, to, amount);
        }
    }

    function universalTransferFromSenderToThis(
        IERC20 token,
        uint256 amount
    )
        internal
    {
        if (amount == 0) {
            return;
        }

        if (isETH(token)) {
            if (msg.value > amount) {
                // Return remainder if exist
                payable(msg.sender).transfer(msg.value - amount);
            }
        } else {
            token.safeTransferFrom(msg.sender, address(this), amount);
        }
    }

    function universalApprove(
        IERC20 token,
        address to,
        uint256 amount
    )
        internal
    {
        if (!isETH(token)) {
            if (amount == 0) {
                token.safeApprove(to, 0);
                return;
            }

            uint256 approvedAmount = token.allowance(address(this), to);
            if (approvedAmount > 0) {
                token.safeApprove(to, 0);
            }
            token.safeApprove(to, amount);
        }
    }

    function universalBalanceOf(IERC20 token, address who) internal view returns (uint256) {
        if (isETH(token)) {
            return who.balance;
        } else {
            return token.balanceOf(who);
        }
    }

    function isETH(IERC20 token) internal pure returns(bool) {
        return (address(token) == address(ZERO_ADDRESS) || address(token) == address(ETH_ADDRESS));
    }

    // function notExist(IERC20 token) internal pure returns(bool) {
    //     return (address(token) == address(-1));
    // }
}