FallbackExecutor

{{
  "language": "Solidity",
  "sources": {
    "@openzeppelin/contracts/access/Ownable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @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 {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _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);
    }
}
"
    },
    "@openzeppelin/contracts/interfaces/IERC1363.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (interfaces/IERC1363.sol)

pragma solidity ^0.8.20;

import {IERC20} from "./IERC20.sol";
import {IERC165} from "./IERC165.sol";

/**
 * @title IERC1363
 * @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
 *
 * Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
 * after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
 */
interface IERC1363 is IERC20, IERC165 {
    /*
     * Note: the ERC-165 identifier for this interface is 0xb0202a11.
     * 0xb0202a11 ===
     *   bytes4(keccak256('transferAndCall(address,uint256)')) ^
     *   bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
     */

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @param data Additional data with no specified format, sent in call to `spender`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}
"
    },
    "@openzeppelin/contracts/interfaces/IERC165.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC165.sol)

pragma solidity ^0.8.20;

import {IERC165} from "../utils/introspection/IERC165.sol";
"
    },
    "@openzeppelin/contracts/interfaces/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../token/ERC20/IERC20.sol";
"
    },
    "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}
"
    },
    "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC-20 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 {
    /**
     * @dev An operation with an ERC-20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @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.encodeCall(token.transfer, (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.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Variant of {safeTransfer} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransfer(IERC20 token, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Variant of {safeTransferFrom} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransferFrom(IERC20 token, address from, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transferFrom, (from, to, 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.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @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.
     *
     * NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
     * only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
     * set here.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            safeTransfer(token, to, value);
        } else if (!token.transferAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
     * has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferFromAndCallRelaxed(
        IERC1363 token,
        address from,
        address to,
        uint256 value,
        bytes memory data
    ) internal {
        if (to.code.length == 0) {
            safeTransferFrom(token, from, to, value);
        } else if (!token.transferFromAndCall(from, to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
     * Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
     * once without retrying, and relies on the returned value to be true.
     *
     * Reverts if the returned value is other than `true`.
     */
    function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            forceApprove(token, to, value);
        } else if (!token.approveAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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 {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            // bubble errors
            if iszero(success) {
                let ptr := mload(0x40)
                returndatacopy(ptr, 0, returndatasize())
                revert(ptr, returndatasize())
            }
            returnSize := returndatasize()
            returnValue := mload(0)
        }

        if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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 silently catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0)
        }
        return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
    }
}
"
    },
    "@openzeppelin/contracts/utils/Context.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

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

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

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}
"
    },
    "@openzeppelin/contracts/utils/introspection/IERC165.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/introspection/IERC165.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[ERC section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
"
    },
    "@openzeppelin/contracts/utils/ReentrancyGuard.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @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 EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * 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;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    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
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // 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;
    }
}
"
    },
    "contracts/FallbackExecutor.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import {ReentrancyGuard} from "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {IUniswapV2Router02} from "./interfaces/IUniswapV2Router.sol";
import {IUniswapV2Factory} from "./interfaces/IUniswapV2Factory.sol";
import {IUniswapV2Pair} from "./interfaces/IUniswapV2Pair.sol";
import {IGradientRegistry} from "./interfaces/IGradientRegistry.sol";

/**
 * @title FallbackExecutor
 * @notice Handles fallback execution of trades through external AMMs
 * @dev Integrates with Uniswap V2 and can be extended to support other DEXes
 */
contract FallbackExecutor is ReentrancyGuard, Ownable {
    using SafeERC20 for IERC20;

    // Registry contract for checking blocked tokens
    IGradientRegistry public immutable gradientRegistry;

    // DEX configurations
    struct DEXConfig {
        address router;
        address factory;
        bool isActive;
        uint256 priority; // Lower number = higher priority
    }

    // State variables
    mapping(address => DEXConfig) public dexes;
    address[] public activeDEXes;
    mapping(address => uint256) public dexIndex; // Track DEX position in array for O(1) removal

    uint256 public maxDEXs = 5;
    uint256 public constant MAX_DEADLINE = 300; // 5 minutes
    uint256 public minLiquidityThreshold = 10 ether; // Minimum liquidity in ETH equivalent

    // Events
    event DEXAdded(address indexed dex, address router, address factory);
    event DEXRemoved(address indexed dex);
    event MinLiquidityThresholdUpdated(
        uint256 oldThreshold,
        uint256 newThreshold
    );
    event TradeExecuted(
        address indexed token,
        address indexed dex,
        uint256 amountIn,
        uint256 amountOut,
        bool isBuy
    );

    // Modifiers
    modifier onlyOrderbook() {
        require(
            msg.sender == gradientRegistry.orderbook(),
            "FallbackExecutor: Only orderbook can call"
        );
        _;
    }

    constructor(IGradientRegistry _gradientRegistry) Ownable(msg.sender) {
        gradientRegistry = _gradientRegistry;
    }

    /**
     * @notice Add a new DEX to the fallback system
     * @param dex The DEX address
     * @param router The DEX's router contract
     * @param priority Priority level (lower = higher priority)
     */
    function addDEX(
        address dex,
        address router,
        uint256 priority
    ) external onlyOwner {
        require(activeDEXes.length < maxDEXs, "Max DEXs reached");
        require(dex != address(0), "Invalid DEX");
        require(router != address(0), "Invalid router");
        require(!dexes[dex].isActive, "DEX already exists");

        address factory = IUniswapV2Router02(router).factory();
        dexes[dex] = DEXConfig({
            router: router,
            factory: factory,
            isActive: true,
            priority: priority
        });

        activeDEXes.push(dex);
        dexIndex[dex] = activeDEXes.length - 1; // Set initial index
        _sortDEXesByPriority();

        emit DEXAdded(dex, router, factory);
    }

    /**
     * @notice Remove a DEX from the fallback system
     * @param dex The DEX to remove
     */
    function removeDEX(address dex) external onlyOwner {
        require(dexes[dex].isActive, "DEX not found");

        uint256 lastDEXIndex = activeDEXes.length - 1;
        address lastDEX = activeDEXes[lastDEXIndex];

        // Swap the element to remove with the last element
        activeDEXes[dexIndex[dex]] = lastDEX;
        dexIndex[lastDEX] = dexIndex[dex];

        // Remove the last element
        activeDEXes.pop();
        delete dexIndex[dex];

        dexes[dex].isActive = false;

        emit DEXRemoved(dex);
    }

    /**
     * @notice Set the minimum liquidity threshold to protect against price manipulation
     * @param newThreshold The new minimum liquidity threshold in ETH equivalent
     * @dev Only callable by contract owner
     * @dev Higher thresholds provide better protection but may exclude more DEXes
     */
    function setMinLiquidityThreshold(uint256 newThreshold) external onlyOwner {
        require(newThreshold > 0, "Threshold must be greater than 0");
        require(newThreshold <= 1000 ether, "Threshold too high"); // Reasonable upper limit

        uint256 oldThreshold = minLiquidityThreshold;
        minLiquidityThreshold = newThreshold;

        emit MinLiquidityThresholdUpdated(oldThreshold, newThreshold);
    }

    /**
     * @notice Execute a trade through the best available DEX
     * @param token The token to trade
     * @param amount The amount to trade
     * @param minAmountOut Minimum amount to receive
     * @param isBuy Whether this is a buy or sell order
     * @return amountOut The actual amount received from the trade
     * @dev Only callable by the orderbook contract to prevent fee bypass
     */
    function executeTrade(
        address token,
        uint256 amount,
        uint256 minAmountOut,
        bool isBuy
    ) external payable onlyOrderbook nonReentrant returns (uint256 amountOut) {
        require(token != address(0), "Invalid token");
        require(amount > 0, "Amount must be greater than 0");
        require(minAmountOut > 0, "Invalid minAmountOut");
        require(!gradientRegistry.blockedTokens(token), "Token is blocked");

        // For buy orders, require ETH to be sent
        if (isBuy) {
            require(msg.value >= amount, "Insufficient ETH sent for buy order");
        }

        // Get the best DEX for this trade
        address bestDEX = _getBestDEX(token, amount, isBuy);
        require(bestDEX != address(0), "No suitable DEX found");

        DEXConfig storage dexConfig = dexes[bestDEX];
        IUniswapV2Router02 router = IUniswapV2Router02(dexConfig.router);

        // Prepare path
        address[] memory path = new address[](2);
        if (isBuy) {
            path[0] = router.WETH(); // WETH
            path[1] = token;
        } else {
            path[0] = token;
            path[1] = router.WETH(); // WETH
        }

        // Execute trade
        if (isBuy) {
            // Buy tokens with ETH
            uint256 balanceBefore = IERC20(token).balanceOf(msg.sender);

            router.swapExactETHForTokensSupportingFeeOnTransferTokens{
                value: amount
            }(minAmountOut, path, msg.sender, block.timestamp + MAX_DEADLINE);

            uint256 balanceAfter = IERC20(token).balanceOf(msg.sender);
            amountOut = balanceAfter - balanceBefore;

            // Validate slippage protection
            require(amountOut >= minAmountOut, "Insufficient output amount");
        } else {
            // Sell tokens for ETH
            uint256 balanceBefore = address(this).balance;
            IERC20(token).safeTransferFrom(msg.sender, address(this), amount);

            // Safe approval pattern
            _safeApprove(token, dexConfig.router, amount);

            router.swapExactTokensForETHSupportingFeeOnTransferTokens(
                amount,
                minAmountOut,
                path,
                address(this),
                block.timestamp + MAX_DEADLINE
            );

            uint256 balanceAfter = address(this).balance;
            amountOut = balanceAfter - balanceBefore;

            // Validate slippage protection
            require(amountOut >= minAmountOut, "Insufficient output amount");

            // Transfer ETH to caller
            (bool success, ) = msg.sender.call{value: amountOut}("");
            require(success, "ETH transfer failed");
        }

        emit TradeExecuted(token, bestDEX, amount, amountOut, isBuy);
        return amountOut;
    }

    /**
     * @notice Get the best DEX for a trade
     * @param token The token to trade
     * @param amount The amount to trade
     * @param isBuy Whether this is a buy or sell order
     * @return The address of the best DEX
     */
    function _getBestDEX(
        address token,
        uint256 amount,
        bool isBuy
    ) internal view returns (address) {
        // Try all active DEXes in priority order
        for (uint256 i = 0; i < activeDEXes.length; i++) {
            address dex = activeDEXes[i];
            if (_isDEXSuitable(dex, token, amount, isBuy)) {
                return dex;
            }
        }

        return address(0);
    }

    /**
     * @notice Get all active DEXes in priority order
     * @return Array of DEX addresses sorted by priority (lowest first)
     */
    function getActiveDEXes() external view returns (address[] memory) {
        return activeDEXes;
    }

    /**
     * @notice Get DEX configuration by address
     * @param dex The DEX address
     * @return DEXConfig struct containing router, factory, isActive, and priority
     */
    function getDEXConfig(
        address dex
    ) external view returns (DEXConfig memory) {
        return dexes[dex];
    }

    /**
     * @notice Check if a DEX is suitable for a trade
     * @param dex The DEX to check
     * @param token The token to trade
     * @param amount The amount to trade
     * @param isBuy Whether this is a buy or sell order
     */
    function _isDEXSuitable(
        address dex,
        address token,
        uint256 amount,
        bool isBuy
    ) internal view returns (bool) {
        DEXConfig storage dexConfig = dexes[dex];
        if (!dexConfig.isActive) return false;

        // Get WETH address from router
        IUniswapV2Router02 router = IUniswapV2Router02(dexConfig.router);
        address weth = router.WETH();

        // Check if the pair exists
        address pair = IUniswapV2Factory(dexConfig.factory).getPair(
            token,
            weth
        );
        if (pair == address(0)) return false;

        // Check liquidity
        (uint112 reserve0, uint112 reserve1, ) = IUniswapV2Pair(pair)
            .getReserves();
        uint256 tokenReserve = token < weth ? reserve0 : reserve1;
        uint256 ethReserve = token < weth ? reserve1 : reserve0;

        // Check minimum liquidity threshold (protects against flash loan attacks)
        if (ethReserve < minLiquidityThreshold) {
            return false;
        }

        // Ensure sufficient liquidity with safety margin for the specific trade
        if (isBuy) {
            return ethReserve >= (amount * 11) / 10; // 10% safety margin
        } else {
            return tokenReserve >= (amount * 11) / 10; // 10% safety margin
        }
    }

    /**
     * @notice Safe approval pattern that resets approval to 0 first
     * @param token The token to approve
     * @param spender The spender address
     * @param amount The amount to approve
     */
    function _safeApprove(
        address token,
        address spender,
        uint256 amount
    ) internal {
        IERC20(token).approve(spender, 0); // Reset approval
        IERC20(token).approve(spender, amount); // Set new approval
    }

    /**
     * @notice Sort DEXes by priority
     */
    function _sortDEXesByPriority() internal {
        // Insertion sort - more efficient than bubble sort for small arrays
        for (uint256 i = 1; i < activeDEXes.length; i++) {
            address currentDEX = activeDEXes[i];
            uint256 currentPriority = dexes[currentDEX].priority;
            uint256 j = i;

            // Move elements that are greater than current one position ahead
            while (
                j > 0 && dexes[activeDEXes[j - 1]].priority > currentPriority
            ) {
                address movedDEX = activeDEXes[j - 1];
                activeDEXes[j] = movedDEX;
                dexIndex[movedDEX] = j; // Update index for the moved DEX
                j--;
            }

            // Place current element in correct position
            activeDEXes[j] = currentDEX;
            dexIndex[currentDEX] = j; // Update index mapping
        }
    }

    receive() external payable {}
}
"
    },
    "contracts/interfaces/IGradientRegistry.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

/**
 * @title IGradientRegistry
 * @notice Interface for the GradientRegistry contract
 */
interface IGradientRegistry {
    /**
     * @notice Set all main contract addresses at once
     * @param _marketMakerFactory Address of the MarketMakerFactory contract
     * @param _gradientToken Address of the Gradient token contract
     * @param _orderbook Address of the Orderbook contract
     * @param _fallbackExecutor Address of the FallbackExecutor contract
     * @param _router Address of the Uniswap V2 Router contract
     */
    function setMainContracts(
        address _marketMakerFactory,
        address _gradientToken,
        address _orderbook,
        address _fallbackExecutor,
        address _router
    ) external;

    /**
     * @notice Set an individual main contract address
     * @param contractName Name of the contract to update
     * @param newAddress New address for the contract
     */
    function setContractAddress(
        string calldata contractName,
        address newAddress
    ) external;

    /**
     * @notice Set an additional contract address using a key
     * @param key The key to identify the contract
     * @param contractAddress The address of the contract
     */
    function setAdditionalContract(
        bytes32 key,
        address contractAddress
    ) external;

    /**
     * @notice Set the block status of a token
     * @param token The address of the token to set the block status of
     * @param blocked Whether the token should be blocked
     */
    function setTokenBlockStatus(address token, bool blocked) external;

    /**
     * @notice Set a reward distributor address
     * @param rewardDistributor The address of the reward distributor to authorize
     */
    function setRewardDistributor(address rewardDistributor) external;

    /**
     * @notice Authorize or deauthorize a fulfiller
     * @param fulfiller The address of the fulfiller to authorize
     * @param status The status of the fulfiller
     */
    function authorizeFulfiller(address fulfiller, bool status) external;

    /**
     * @notice Check if an address is an authorized fulfiller
     * @param fulfiller The address to check
     * @return bool Whether the address is an authorized fulfiller
     */
    function isAuthorizedFulfiller(
        address fulfiller
    ) external view returns (bool);

    /**
     * @notice Get all main contract addresses
     * @return _marketMakerFactory Address of the MarketMakerFactory contract
     * @return _gradientToken Address of the Gradient token contract
     * @return _orderbook Address of the Orderbook contract
     * @return _fallbackExecutor Address of the FallbackExecutor contract
     * @return _router Address of the Uniswap V2 Router contract
     */
    function getAllMainContracts()
        external
        view
        returns (
            address _marketMakerFactory,
            address _gradientToken,
            address _orderbook,
            address _fallbackExecutor,
            address _router
        );

    // View functions for individual contract addresses
    function marketMakerFactory() external view returns (address);

    // Legacy function for backward compatibility (returns factory address)
    function marketMakerPool() external view returns (address);

    // New function to get pool for specific token
    function getMarketMakerPool(address token) external view returns (address);

    // New function to check if pool exists for token
    function poolExists(address token) external view returns (bool);

    function gradientToken() external view returns (address);

    function orderbook() external view returns (address);

    function fallbackExecutor() external view returns (address);

    function router() external view returns (address);

    // View functions for mappings
    function blockedTokens(address token) external view returns (bool);

    function isRewardDistributor(
        address rewardDistributor
    ) external view returns (bool);

    function authorizedFulfillers(
        address fulfiller
    ) external view returns (bool);
}
"
    },
    "contracts/interfaces/IUniswapV2Factory.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

interface IUniswapV2Factory {
    event PairCreated(
        address indexed token0,
        address indexed token1,
        address pair,
        uint
    );

    function feeTo() external view returns (address);

    function feeToSetter() external view returns (address);

    function getPair(
        address tokenA,
        address tokenB
    ) external view returns (address pair);

    function allPairs(uint) external view returns (address pair);

    function allPairsLength() external view returns (uint);

    function createPair(
        address tokenA,
        address tokenB
    ) external returns (address pair);

    function setFeeTo(address) external;

    function setFeeToSetter(address) external;
}
"
    },
    "contracts/interfaces/IUniswapV2Pair.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint);

    function balanceOf(address owner) external view returns (uint);

    function allowance(
        address owner,
        address spender
    ) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);

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

    function transferFrom(
        address from,
        address to,
        uint value
    ) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint);

    function permit(
        address owner,
        address spender,
        uint value,
        uint deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(
        address indexed sender,
        uint amount0,
        uint amount1,
        address indexed to
    );
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);

    function factory() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves()
        external
        view
        returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);

    function price0CumulativeLast() external view returns (uint);

    function price1CumulativeLast() external view returns (uint);

    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);

    function burn(address to) external returns (uint amount0, uint amount1);

    function swap(
        uint amount0Out,
        uint amount1Out,
        address to,
        bytes calldata data
    ) external;

    function skim(address to) external;

    function sync() external;

    function initialize(address, address) external;
}
"
    },
    "contracts/interfaces/IUniswapV2Router.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

interface IUniswapV2Router01 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);

    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    )
        external
        payable
        returns (uint amountToken, uint amountETH, uint liquidity);

    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);

    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);

    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint amountA, uint amountB);

    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint amountToken, uint amountETH);

    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);

    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);

    function swapExactETHForTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable returns (uint[] memory amounts);

    function swapTokensForExactETH(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);

    function swapExactTokensForETH(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);

    function swapETHForExactTokens(
        uint amountOut,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable returns (uint[] memory amounts);

    function quote(
        uint amountA,
        uint reserveA,
        uint reserveB
    ) external pure returns (uint amountB);

    function getAmountOut(
        uint amountIn,
        uint reserveIn,
        uint reserveOut
    ) external pure returns (uint amountOut);

    function getAmountIn(
        uint amountOut,
        uint reserveIn,
        uint reserveOut
    ) external pure returns (uint amountIn);

    function getAmountsOut(
        uint amountIn,
        address[] calldata path
    ) external view returns (uint[] memory amounts);

    function getAmountsIn(
        uint amountOut,
        address[] calldata path
    ) external view returns (uint[] memory amounts);
}

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);

    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}
"
    }
  },
  "settings": {
    "viaIR": true,
    "optimizer": {
      "enabled": true,
      "runs": 200
    },
    "evmVersion": "paris",
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    }
  }
}}