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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

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

// =============================================================================
// AAVE FLASH ARBITRAGE V4 - BALANCER V2 FLASH LOANS + UNISWAP V3 SWAPS
// =============================================================================
//
// V4 Changes from V3:
// - Uses Balancer V2 flashLoan() instead of V3 unlock() (permissionless, 0% fee!)
// - Uniswap V3 multi-hop for GHO↔AAVE swaps (replaces dead Balancer pools)
// - Based on working VLRFlashArbitrageV3 pattern
//
// Architecture:
// - Flash Loans: Balancer V2 (receiveFlashLoan callback, 0% fee)
// - Outcome Swaps: Uniswap V3 (YES_AAVE/YES_GHO, NO_AAVE/NO_GHO pools)
// - Repayment Swaps: Uniswap V3 multi-hop (GHO→USDC→WETH→AAVE)
// =============================================================================

// =============================================================================
// INTERFACES
// =============================================================================

interface IBalancerV2Vault {
    function flashLoan(
        address recipient,
        IERC20[] memory tokens,
        uint256[] memory amounts,
        bytes memory userData
    ) external;
}

interface ISwapRouter {
    struct ExactInputSingleParams {
        address tokenIn;
        address tokenOut;
        uint24 fee;
        address recipient;
        uint256 deadline;
        uint256 amountIn;
        uint256 amountOutMinimum;
        uint160 sqrtPriceLimitX96;
    }

    struct ExactInputParams {
        bytes path;
        address recipient;
        uint256 deadline;
        uint256 amountIn;
        uint256 amountOutMinimum;
    }

    function exactInputSingle(ExactInputSingleParams calldata params) external payable returns (uint256 amountOut);
    function exactInput(ExactInputParams calldata params) external payable returns (uint256 amountOut);
}

interface IFutarchyRouter {
    function splitPosition(address proposal, address collateralToken, uint256 amount) external;
    function mergePositions(address proposal, address collateralToken, uint256 amount) external;
}

interface IFutarchyProposal {
    function collateralToken1() external view returns (IERC20);
    function collateralToken2() external view returns (IERC20);
    function wrappedOutcome(uint256 index) external view returns (IERC20 wrapped1155, bytes memory data);
}

// =============================================================================
// CONTRACT
// =============================================================================

/**
 * @title AaveFlashArbitrageV4
 * @notice Flash arbitrage for AAVE/GHO markets using Balancer V2 flash loans
 * @dev
 * V4 Improvements:
 * - Balancer V2 flash loans (permissionless, 0% fee!)
 * - Uniswap V3 multi-hop paths for GHO↔AAVE (replaces dead Balancer pools)
 * - minProfit MEV protection
 * 
 * Strategies:
 * - SPOT_SPLIT (0): Borrow AAVE → Split → Swap to GHO outcomes → Merge to GHO → Swap back to AAVE
 * - MERGE_SPOT (1): Borrow AAVE → Swap to GHO → Split → Swap to AAVE outcomes → Merge to AAVE
 */
contract AaveFlashArbitrageV4 is ReentrancyGuard {
    using SafeERC20 for IERC20;

    // ==========================================================================
    // CONSTANTS (Mainnet)
    // ==========================================================================

    address public constant AAVE = 0x7Fc66500c84A76Ad7e9c93437bFc5Ac33E2DDaE9;
    address public constant GHO  = 0x40D16FC0246aD3160Ccc09B8D0D3A2cD28aE6C2f;
    address public constant USDC = 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48;
    address public constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;

    // Balancer V2 Vault (0% flash loan fee!)
    IBalancerV2Vault public constant balancerVault = IBalancerV2Vault(0xBA12222222228d8Ba445958a75a0704d566BF2C8);
    
    // Uniswap V3 SwapRouter
    ISwapRouter public constant swapRouter = ISwapRouter(0xE592427A0AEce92De3Edee1F18E0157C05861564);
    
    // Futarchy Router (Mainnet - same as VLR contract)
    IFutarchyRouter public constant futarchyRouter = IFutarchyRouter(0xAc9Bf8EbA6Bd31f8E8c76f8E8B2AAd0BD93f98Dc);

    // Uniswap V3 fee tiers
    uint24 public constant FEE_LOWEST = 100;   // 0.01%
    uint24 public constant FEE_LOW    = 500;   // 0.05%
    uint24 public constant FEE_MEDIUM = 3000;  // 0.30%
    uint24 public constant FEE_HIGH   = 10000; // 1.00%

    address public admin;

    // ==========================================================================
    // STRUCTS & ENUMS
    // ==========================================================================

    enum ArbitrageDirection { SPOT_SPLIT, MERGE_SPOT }

    struct ProposalInfo {
        address proposal;
        address yesAave;
        address noAave;
        address yesGho;
        address noGho;
        bool isValid;
    }

    struct ArbitrageResult {
        bool success;
        uint256 profit;
        uint256 borrowAmount;
        uint256 gasUsed;
    }

    struct ArbitrageParams {
        address proposal;
        ArbitrageDirection direction;
        uint256 minProfit;
    }

    // Transient state for callback
    ArbitrageParams private _params;
    address private _profitRecipient;
    ArbitrageResult private _lastResult;

    // ==========================================================================
    // EVENTS (for debugging)
    // ==========================================================================

    event ArbitrageStarted(
        address indexed caller,
        address indexed proposal,
        ArbitrageDirection direction,
        uint256 borrowAmount
    );

    event SwapExecuted(
        string step,
        address tokenIn,
        address tokenOut,
        uint256 amountIn,
        uint256 amountOut
    );

    event SplitExecuted(address token, uint256 amount);
    event MergeExecuted(address token, uint256 amount);

    event ArbitrageCompleted(
        address indexed caller,
        uint256 profit,
        uint256 borrowAmount,
        uint256 gasUsed
    );

    error ArbitrageFailed(uint256 balanceAfter, uint256 required, string reason);
    error InsufficientProfit(uint256 actual, uint256 minimum);
    error InvalidProposal(address proposal);

    // ==========================================================================
    // CONSTRUCTOR
    // ==========================================================================

    constructor() {
        admin = msg.sender;
        
        // Pre-approve tokens to SwapRouter
        IERC20(AAVE).approve(address(swapRouter), type(uint256).max);
        IERC20(GHO).approve(address(swapRouter), type(uint256).max);
        IERC20(USDC).approve(address(swapRouter), type(uint256).max);
        IERC20(WETH).approve(address(swapRouter), type(uint256).max);
        
        // Pre-approve to FutarchyRouter
        IERC20(AAVE).approve(address(futarchyRouter), type(uint256).max);
        IERC20(GHO).approve(address(futarchyRouter), type(uint256).max);
    }

    // ==========================================================================
    // EXTERNAL: EXECUTE ARBITRAGE
    // ==========================================================================

    /**
     * @notice Execute flash arbitrage
     * @param proposalAddress Futarchy proposal address
     * @param borrowAmount Amount to flash borrow (in AAVE)
     * @param direction SPOT_SPLIT (0) or MERGE_SPOT (1)
     * @param minProfit Minimum profit required (MEV protection)
     * @return result Arbitrage result
     */
    function executeArbitrage(
        address proposalAddress,
        uint256 borrowAmount,
        ArbitrageDirection direction,
        uint256 minProfit
    ) external nonReentrant returns (ArbitrageResult memory result) {
        uint256 gasStart = gasleft();

        emit ArbitrageStarted(msg.sender, proposalAddress, direction, borrowAmount);

        // Store params for callback
        _params = ArbitrageParams({
            proposal: proposalAddress,
            direction: direction,
            minProfit: minProfit
        });
        _profitRecipient = msg.sender;

        // Flash Loan via Balancer V2 (0% fee!)
        IERC20[] memory tokens = new IERC20[](1);
        tokens[0] = IERC20(AAVE);
        uint256[] memory amounts = new uint256[](1);
        amounts[0] = borrowAmount;

        balancerVault.flashLoan(address(this), tokens, amounts, abi.encode(_params));

        result = _lastResult;
        result.gasUsed = gasStart - gasleft();

        emit ArbitrageCompleted(msg.sender, result.profit, result.borrowAmount, result.gasUsed);

        return result;
    }

    // ==========================================================================
    // BALANCER V2 CALLBACK
    // ==========================================================================

    function receiveFlashLoan(
        IERC20[] memory,
        uint256[] memory amounts,
        uint256[] memory feeAmounts,
        bytes memory userData
    ) external {
        require(msg.sender == address(balancerVault), "Only Balancer Vault");

        ArbitrageParams memory params = abi.decode(userData, (ArbitrageParams));
        uint256 borrowAmount = amounts[0];
        uint256 repayAmount = borrowAmount + feeAmounts[0]; // feeAmount is 0 for Balancer V2!

        // Load proposal
        ProposalInfo memory info = _loadProposal(params.proposal);
        if (!info.isValid) {
            revert InvalidProposal(params.proposal);
        }

        // Approve outcome tokens to SwapRouter (dynamic)
        _approveIfNeeded(info.yesAave, address(swapRouter));
        _approveIfNeeded(info.noAave, address(swapRouter));
        _approveIfNeeded(info.yesGho, address(swapRouter));
        _approveIfNeeded(info.noGho, address(swapRouter));
        
        // Approve outcome tokens to FutarchyRouter
        _approveIfNeeded(info.yesAave, address(futarchyRouter));
        _approveIfNeeded(info.noAave, address(futarchyRouter));
        _approveIfNeeded(info.yesGho, address(futarchyRouter));
        _approveIfNeeded(info.noGho, address(futarchyRouter));

        // Execute strategy
        if (params.direction == ArbitrageDirection.SPOT_SPLIT) {
            _executeSpotSplit(info, borrowAmount);
        } else {
            _executeMergeSpot(info, borrowAmount);
        }

        // Check balance and profit
        uint256 aaveBalance = IERC20(AAVE).balanceOf(address(this));
        if (aaveBalance < repayAmount) {
            revert ArbitrageFailed(aaveBalance, repayAmount, "Insufficient to repay");
        }

        uint256 profit = aaveBalance - repayAmount;
        if (profit < params.minProfit) {
            revert InsufficientProfit(profit, params.minProfit);
        }

        // Repay flash loan
        IERC20(AAVE).transfer(address(balancerVault), repayAmount);

        // Send profit to caller
        if (profit > 0) {
            IERC20(AAVE).safeTransfer(_profitRecipient, profit);
        }

        _lastResult = ArbitrageResult({
            success: true,
            profit: profit,
            borrowAmount: borrowAmount,
            gasUsed: 0
        });
    }

    // ==========================================================================
    // STRATEGY: SPOT_SPLIT
    // ==========================================================================
    // 1. Split AAVE → YES_AAVE + NO_AAVE
    // 2. Swap YES_AAVE → YES_GHO
    // 3. Swap NO_AAVE → NO_GHO
    // 4. Merge YES_GHO + NO_GHO → GHO
    // 5. Swap GHO → AAVE (via USDC → WETH → AAVE)

    function _executeSpotSplit(ProposalInfo memory info, uint256 amount) internal {
        // 1. Split
        futarchyRouter.splitPosition(info.proposal, AAVE, amount);
        emit SplitExecuted(AAVE, amount);

        // 2. Swap YES_AAVE → YES_GHO
        uint256 yesAaveBal = IERC20(info.yesAave).balanceOf(address(this));
        if (yesAaveBal > 0) {
            uint256 out = _swapSingle(info.yesAave, info.yesGho, FEE_LOW, yesAaveBal);
            emit SwapExecuted("YES_AAVE->YES_GHO", info.yesAave, info.yesGho, yesAaveBal, out);
        }

        // 3. Swap NO_AAVE → NO_GHO
        uint256 noAaveBal = IERC20(info.noAave).balanceOf(address(this));
        if (noAaveBal > 0) {
            uint256 out = _swapSingle(info.noAave, info.noGho, FEE_LOW, noAaveBal);
            emit SwapExecuted("NO_AAVE->NO_GHO", info.noAave, info.noGho, noAaveBal, out);
        }

        // 4. Merge
        uint256 yesGhoBal = IERC20(info.yesGho).balanceOf(address(this));
        uint256 noGhoBal = IERC20(info.noGho).balanceOf(address(this));
        uint256 mergeAmount = yesGhoBal < noGhoBal ? yesGhoBal : noGhoBal;
        if (mergeAmount > 0) {
            futarchyRouter.mergePositions(info.proposal, GHO, mergeAmount);
            emit MergeExecuted(GHO, mergeAmount);
        }

        // 5. Swap GHO → AAVE (multi-hop via USDC → WETH)
        uint256 ghoBal = IERC20(GHO).balanceOf(address(this));
        if (ghoBal > 0) {
            uint256 out = _swapGhoToAave(ghoBal);
            emit SwapExecuted("GHO->AAVE", GHO, AAVE, ghoBal, out);
        }
    }

    // ==========================================================================
    // STRATEGY: MERGE_SPOT
    // ==========================================================================
    // 1. Swap AAVE → GHO (via WETH → USDC → GHO)
    // 2. Split GHO → YES_GHO + NO_GHO
    // 3. Swap YES_GHO → YES_AAVE
    // 4. Swap NO_GHO → NO_AAVE
    // 5. Merge YES_AAVE + NO_AAVE → AAVE

    function _executeMergeSpot(ProposalInfo memory info, uint256 amount) internal {
        // 1. Swap AAVE → GHO
        uint256 ghoReceived = _swapAaveToGho(amount);
        emit SwapExecuted("AAVE->GHO", AAVE, GHO, amount, ghoReceived);

        // 2. Split GHO
        futarchyRouter.splitPosition(info.proposal, GHO, ghoReceived);
        emit SplitExecuted(GHO, ghoReceived);

        // 3. Swap YES_GHO → YES_AAVE
        uint256 yesGhoBal = IERC20(info.yesGho).balanceOf(address(this));
        if (yesGhoBal > 0) {
            uint256 out = _swapSingle(info.yesGho, info.yesAave, FEE_LOW, yesGhoBal);
            emit SwapExecuted("YES_GHO->YES_AAVE", info.yesGho, info.yesAave, yesGhoBal, out);
        }

        // 4. Swap NO_GHO → NO_AAVE
        uint256 noGhoBal = IERC20(info.noGho).balanceOf(address(this));
        if (noGhoBal > 0) {
            uint256 out = _swapSingle(info.noGho, info.noAave, FEE_LOW, noGhoBal);
            emit SwapExecuted("NO_GHO->NO_AAVE", info.noGho, info.noAave, noGhoBal, out);
        }

        // 5. Merge
        uint256 yesAaveBal = IERC20(info.yesAave).balanceOf(address(this));
        uint256 noAaveBal = IERC20(info.noAave).balanceOf(address(this));
        uint256 mergeAmount = yesAaveBal < noAaveBal ? yesAaveBal : noAaveBal;
        if (mergeAmount > 0) {
            futarchyRouter.mergePositions(info.proposal, AAVE, mergeAmount);
            emit MergeExecuted(AAVE, mergeAmount);
        }
    }

    // ==========================================================================
    // SWAP HELPERS (UNISWAP V3)
    // ==========================================================================

    /**
     * @dev Single-hop Uniswap V3 swap
     */
    function _swapSingle(
        address tokenIn,
        address tokenOut,
        uint24 fee,
        uint256 amountIn
    ) internal returns (uint256 amountOut) {
        ISwapRouter.ExactInputSingleParams memory params = ISwapRouter.ExactInputSingleParams({
            tokenIn: tokenIn,
            tokenOut: tokenOut,
            fee: fee,
            recipient: address(this),
            deadline: block.timestamp,
            amountIn: amountIn,
            amountOutMinimum: 0,  // Rely on minProfit check
            sqrtPriceLimitX96: 0
        });
        return swapRouter.exactInputSingle(params);
    }

    /**
     * @dev Multi-hop: GHO → USDC (0.01%) → WETH (0.05%) → AAVE (0.3%)
     */
    function _swapGhoToAave(uint256 amountIn) internal returns (uint256 amountOut) {
        bytes memory path = abi.encodePacked(
            GHO, FEE_LOWEST,   // GHO → USDC (0.01%)
            USDC, FEE_LOW,     // USDC → WETH (0.05%)
            WETH, FEE_MEDIUM,  // WETH → AAVE (0.3%)
            AAVE
        );

        ISwapRouter.ExactInputParams memory params = ISwapRouter.ExactInputParams({
            path: path,
            recipient: address(this),
            deadline: block.timestamp,
            amountIn: amountIn,
            amountOutMinimum: 0  // Rely on minProfit check
        });

        return swapRouter.exactInput(params);
    }

    /**
     * @dev Multi-hop: AAVE → WETH (0.3%) → USDC (0.05%) → GHO (0.01%)
     */
    function _swapAaveToGho(uint256 amountIn) internal returns (uint256 amountOut) {
        bytes memory path = abi.encodePacked(
            AAVE, FEE_MEDIUM,  // AAVE → WETH (0.3%)
            WETH, FEE_LOW,     // WETH → USDC (0.05%)
            USDC, FEE_LOWEST,  // USDC → GHO (0.01%)
            GHO
        );

        ISwapRouter.ExactInputParams memory params = ISwapRouter.ExactInputParams({
            path: path,
            recipient: address(this),
            deadline: block.timestamp,
            amountIn: amountIn,
            amountOutMinimum: 0  // Rely on minProfit check
        });

        return swapRouter.exactInput(params);
    }

    // ==========================================================================
    // UTILS
    // ==========================================================================

    function _loadProposal(address proposalAddr) internal view returns (ProposalInfo memory info) {
        IFutarchyProposal proposal = IFutarchyProposal(proposalAddr);
        info.proposal = proposalAddr;

        address col1 = address(proposal.collateralToken1());
        address col2 = address(proposal.collateralToken2());

        // Validate AAVE/GHO market
        bool validPair = (col1 == AAVE && col2 == GHO) || (col1 == GHO && col2 == AAVE);
        if (!validPair) return info;

        info.isValid = true;

        // Load outcome tokens
        (IERC20 y0,) = proposal.wrappedOutcome(0);
        (IERC20 n0,) = proposal.wrappedOutcome(1);
        (IERC20 y1,) = proposal.wrappedOutcome(2);
        (IERC20 n1,) = proposal.wrappedOutcome(3);

        if (col1 == AAVE) {
            info.yesAave = address(y0);
            info.noAave = address(n0);
            info.yesGho = address(y1);
            info.noGho = address(n1);
        } else {
            info.yesGho = address(y0);
            info.noGho = address(n0);
            info.yesAave = address(y1);
            info.noAave = address(n1);
        }
    }

    function _approveIfNeeded(address token, address spender) internal {
        if (IERC20(token).allowance(address(this), spender) == 0) {
            IERC20(token).approve(spender, type(uint256).max);
        }
    }

    // ==========================================================================
    // ADMIN
    // ==========================================================================

    function recoverTokens(address token, uint256 amount) external {
        require(msg.sender == admin, "Admin only");
        IERC20(token).safeTransfer(admin, amount);
    }

    function transferAdmin(address newAdmin) external {
        require(msg.sender == admin, "Admin only");
        require(newAdmin != address(0), "Invalid admin");
        admin = newAdmin;
    }

    receive() external payable {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC1363.sol)

pragma solidity >=0.6.2;

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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC165.sol)

pragma solidity >=0.4.16;

import {IERC165} from "../utils/introspection/IERC165.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC20.sol)

pragma solidity >=0.4.16;

import {IERC20} from "../token/ERC20/IERC20.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @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);
}

// 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);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (utils/introspection/IERC165.sol)

pragma solidity >=0.4.16;

/**
 * @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);
}

// 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;
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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IFutarchyRouter","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IERC20[]","name":"","type":"address[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"},{"internalType":"uint256[]","name":"feeAmounts","type":"uint256[]"},{"internalType":"bytes","name":"userData","type":"bytes"}],"name":"receiveFlashLoan","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"recoverTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"swapRouter","outputs":[{"internalType":"contract ISwapRouter","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newAdmin","type":"address"}],"name":"transferAdmin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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