// SPDX-License-Identifier: MIT
/**

pragma solidity ^0.8.28;

import "../base/GluedLoanReceiver.sol";

/**
 * @title Example Arbitrage Bot
 * @notice Demonstrates how to use the GluedLoanReceiver base contract for arbitrage operations
 * @dev This contract shows practical usage of flash loans for arbitrage strategies
 */
contract ExampleArbitrageBot is GluedLoanReceiver {

    /// @notice Owner of the contract
    address public owner;

    /// @notice Minimum profit threshold for arbitrage opportunities
    uint256 public minimumProfit;

    /**
     * @notice Constructor sets the owner and minimum profit
     * @param _owner Address of the contract owner
     * @param _minimumProfit Minimum profit required for arbitrage
     */
    constructor(address _owner, uint256 _minimumProfit) {
        owner = _owner;
        minimumProfit = _minimumProfit;
    }

    /**
     * @notice Modifier to restrict access to owner only
     */
    modifier onlyOwner() {
        require(msg.sender == owner, "Not owner");
        _;
    }

    /**
     * @notice Request a cross-glue loan for arbitrage opportunity
     * @param useERC721 True to use ERC721 glues, false for ERC20 glues
     * @param glues Array of glue addresses to borrow from
     * @param collateral Token to borrow for arbitrage
     * @param amount Total amount to borrow
     * @param arbitrageData Encoded data for arbitrage execution
     * @return success True if loan was successfully requested
     */
    function requestArbitrageLoan(
        bool useERC721,
        address[] memory glues,
        address collateral,
        uint256 amount,
        bytes memory arbitrageData
    ) external onlyOwner returns (bool success) {
        
        // Emit loan request event
        emit LoanRequested("gluedLoan", collateral, amount);
        
        // Request the glued loan using our helper function
        return _requestGluedLoan(useERC721, glues, collateral, amount, arbitrageData);
    }

    /**
     * @notice Request a simple flash loan from a single glue
     * @param glue Address of the glue to borrow from
     * @param collateral Token to borrow
     * @param amount Amount to borrow
     * @param strategyData Encoded data for the strategy
     * @return success True if loan was successfully requested
     */
    function requestSimpleLoan(
        address glue,
        address collateral,
        uint256 amount,
        bytes memory strategyData
    ) external onlyOwner returns (bool success) {
        
        // Emit loan request event
        emit LoanRequested("flashLoan", collateral, amount);
        
        // Request the flash loan using our helper function
        return _requestFlashLoan(glue, collateral, amount, strategyData);
    }

    /**
     * @notice Implementation of flash loan logic
     * @param params Encoded arbitrage parameters
     * @return success True if arbitrage was successful
     */
    function _executeFlashLoanLogic(bytes memory params) internal override returns (bool success) {
        
        // Decode parameters
        (string memory strategy, address targetDex, uint256 expectedProfit) = abi.decode(params, (string, address, uint256));
        
        // Get current loan information using external interface
        (
            address[] memory glues,
            address collateral,
            uint256[] memory expectedAmounts,
            uint256 totalBorrowed,
            uint256 totalRepay,
            uint256 totalFees
        ) = this.getCurrentLoanInfo();

        // Emit loan execution start event
        emit FlashLoanLogicStarted(collateral, totalBorrowed);

        // Calculate required profit (fees + minimum profit)
        uint256 requiredProfit = totalFees + minimumProfit;

        // Ensure expected profit exceeds our requirements
        require(expectedProfit >= requiredProfit, "Insufficient profit opportunity");

        // Example arbitrage logic (simplified)
        if (keccak256(abi.encodePacked(strategy)) == keccak256(abi.encodePacked("dex_arbitrage"))) {
            success = _executeDexArbitrage(targetDex, collateral, totalBorrowed, expectedProfit);
        } else if (keccak256(abi.encodePacked(strategy)) == keccak256(abi.encodePacked("liquidation"))) {
            success = _executeLiquidation(targetDex, collateral, totalBorrowed);
        } else {
            // Unknown strategy
            return false;
        }

        // Emit successful execution event
        if (success) {
            emit FlashLoanExecuted(collateral, totalBorrowed, totalRepay, totalFees);
        }

        return success;
    }

    /**
     * @notice Execute DEX arbitrage strategy
     * @param dex Address of the DEX to arbitrage against
     * @param token Token to arbitrage
     * @param amount Amount available for arbitrage
     * @param expectedProfit Expected profit from the arbitrage
     * @return success True if arbitrage was profitable
     */
    function _executeDexArbitrage(
        address dex,
        address token,
        uint256 amount,
        uint256 expectedProfit
    ) internal returns (bool success) {
        
        // Simplified DEX arbitrage logic
        // In a real implementation, this would:
        // 1. Swap tokens on DEX A
        // 2. Swap back on DEX B at better rate
        // 3. Keep the profit
        
        // Mock arbitrage execution
        // This would be replaced with actual DEX interaction code
        
        // For this example, we'll simulate a successful arbitrage
        // that generates the expected profit
        
        // Check if we have enough profit to cover fees and minimum
        uint256 totalFees = this.getCurrentTotalFees();
        
        if (expectedProfit >= totalFees + minimumProfit) {
            // Simulate profit generation
            // In reality, this would be actual token swaps
            return true;
        }
        
        return false;
    }

    /**
     * @notice Execute liquidation strategy
     * @param protocol Address of the lending protocol
     * @param collateral Collateral token
     * @param amount Amount to use for liquidation
     * @return success True if liquidation was successful
     */
    function _executeLiquidation(
        address protocol,
        address collateral,
        uint256 amount
    ) internal returns (bool success) {
        
        // Simplified liquidation logic
        // In a real implementation, this would:
        // 1. Identify underwater positions
        // 2. Execute liquidation
        // 3. Sell seized collateral
        // 4. Keep the liquidation bonus
        
        // Mock liquidation execution
        protocol; // Silence unused variable warning
        collateral; // Silence unused variable warning
        amount; // Silence unused variable warning
        
        // For this example, assume liquidation was successful
        return true;
    }

    /**
     * @notice Update minimum profit threshold
     * @param newMinimumProfit New minimum profit threshold
     */
    function setMinimumProfit(uint256 newMinimumProfit) external onlyOwner {
        minimumProfit = newMinimumProfit;
    }

    /**
     * @notice Plan and validate an arbitrage opportunity before execution
     * @param glue Address of the glue to borrow from
     * @param collateral Collateral token for the loan
     * @param amount Amount needed for arbitrage
     * @return feasible True if the arbitrage is feasible
     * @return available Maximum amount available for loan
     * @return totalCost Total cost including fees
     * @return minimumProfitNeeded Minimum profit needed to be profitable
     */
    function planArbitrage(
        address glue,
        address collateral,
        uint256 amount
    ) external view returns (
        bool feasible,
        uint256 available,
        uint256 totalCost,
        uint256 minimumProfitNeeded
    ) {
        // Get comprehensive loan information
        (
            available,
            ,
            uint256 calculatedFee,
            totalCost,
            bool canAfford
        ) = this.getLoanPlan(glue, collateral, amount);
        
        // Calculate minimum profit needed
        minimumProfitNeeded = calculatedFee + minimumProfit;
        
        // Arbitrage is feasible if glue has enough liquidity
        feasible = canAfford;
        
        return (feasible, available, totalCost, minimumProfitNeeded);
    }

    /**
     * @notice Find the best glue for a loan based on available liquidity
     * @param glues Array of potential glue addresses
     * @param collateral Collateral token to check
     * @param amount Desired loan amount
     * @return bestGlue Address of the glue with most liquidity
     * @return available Amount available from the best glue
     */
    function findBestGlue(
        address[] memory glues,
        address collateral,
        uint256 amount
    ) external view returns (address bestGlue, uint256 available) {
        uint256 maxAvailable = 0;
        
        for (uint256 i = 0; i < glues.length; i++) {
            uint256 glueAvailable = this.maxLoan(glues[i], collateral);
            
            if (glueAvailable >= amount && glueAvailable > maxAvailable) {
                maxAvailable = glueAvailable;
                bestGlue = glues[i];
            }
        }
        
        return (bestGlue, maxAvailable);
    }

    /**
     * @notice Execute arbitrage with automatic loan planning
     * @param glue Address of the glue to borrow from
     * @param collateral Collateral token for arbitrage
     * @param amount Amount to borrow
     * @param targetDex DEX to arbitrage against
     * @param expectedProfit Expected profit from the arbitrage
     */
    function executeSmartArbitrage(
        address glue,
        address collateral,
        uint256 amount,
        address targetDex,
        uint256 expectedProfit
    ) external onlyOwner {
        // Plan the arbitrage first
        (bool feasible, , , uint256 minimumProfitNeeded) = this.planArbitrage(glue, collateral, amount);
        
        require(feasible, "Arbitrage not feasible - insufficient liquidity");
        require(expectedProfit >= minimumProfitNeeded, "Expected profit too low");
        
        // Execute the arbitrage
        bytes memory strategyData = abi.encode("dex_arbitrage", targetDex, expectedProfit);
        require(_requestFlashLoan(glue, collateral, amount, strategyData), "Flash loan request failed");
    }

    /**
     * @notice Emergency function to withdraw stuck tokens
     * @param token Token to withdraw
     * @param amount Amount to withdraw
     */
    function emergencyWithdraw(address token, uint256 amount) external onlyOwner {
        require(!this.isFlashLoanActive(), "Cannot withdraw during flash loan");
        
        if (token == ETH_ADDRESS) {
            payable(owner).transfer(amount);
        } else {
            // Transfer ERC20 token
            (bool success, bytes memory data) = token.call(
                abi.encodeWithSelector(0xa9059cbb, owner, amount)
            );
            require(success && (data.length == 0 || abi.decode(data, (bool))), "Transfer failed");
        }
    }

    /**
     * @notice Allow contract to receive ETH
     */
    receive() external payable {}

    /**
     * @notice Transfer ownership to new owner
     * @param newOwner Address of the new owner
     */
    function transferOwnership(address newOwner) external onlyOwner {
        require(newOwner != address(0), "Invalid address");
        owner = newOwner;
    }
}