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// SPDX-License-Identifier: MIT
pragma solidity >= 0.8.16;

import "./interfaces/IWETH.sol";
import "./interfaces/ISwapV2Router.sol";
import "./interfaces/ISwapV3Router.sol";
import "./libraries/TransferHelper.sol";


contract SwapCentral {
    address public immutable WETH;
    address public owner;
    address private constant UNISWAP_V2_ROUTER = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    address private constant UNISWAP_V3_ROUTER = 0xE592427A0AEce92De3Edee1F18E0157C05861564;

    ISwapV2Router private constant routerV2 = ISwapV2Router(UNISWAP_V2_ROUTER);
    ISwapV3Router private constant routerV3 = ISwapV3Router(UNISWAP_V3_ROUTER);

    event NewOwner(address indexed owner, uint time);
    event WithdrawETH(uint amount, uint time);
    event WithdrawToken(address indexed token, uint amount, uint time);
    
    constructor(address _WETH){
        require(_WETH != address(0), "please put the correct WETH token address");
        WETH = _WETH;
        owner = msg.sender;
    }

    modifier onlyOwner(){
        require(msg.sender == owner, "you're not the owner");
        _;
    }

    //---------------Uniswap V2 Starts Here----------------------//
    //get estimation output
    function V2GetEstimatedOut(uint amountIn, address tokenIn, address tokenOut) external view returns (uint[] memory){
        address[] memory path = createPath(tokenIn, tokenOut);
        return routerV2.getAmountsOut(amountIn, path);
    }

    //get estimation input
    function V2GetEstimatedIn(uint amountOutDesired, address tokenIn, address tokenOut) external view returns (uint[] memory){
        address[] memory path = createPath(tokenIn, tokenOut);
        return routerV2.getAmountsIn(amountOutDesired, path);
    }


    //1. token exact amount in, exact token -> token 
    function V2SwapExactTokensForTokens(
        address caller,
        address tokenIn, 
        address tokenOut, 
        uint amountIn, 
        uint amountOutMin,
        uint deadlineInSeconds
    ) external returns (uint[] memory amounts)
    {
        TransferHelper.safeTransferFrom(tokenIn, msg.sender, address(this), amountIn);
        TransferHelper.safeApprove(tokenIn, UNISWAP_V2_ROUTER, amountIn);

        address[] memory path = createPath(tokenIn, tokenOut);
        amounts = routerV2.swapExactTokensForTokens(
            amountIn,
            amountOutMin,
            path,
            caller,
            block.timestamp + deadlineInSeconds
        );
    }

    //2. token exact amount out, token -> exact token
    function V2SwapTokensForExactTokens(
        address caller, 
        address tokenIn,
        address tokenOut,
        uint amountOutDesired,
        uint amountInMax,
        uint deadlineInSeconds
    ) external returns (uint[] memory amounts) 
    {
        TransferHelper.safeTransferFrom(tokenIn, msg.sender, address(this), amountInMax);
        TransferHelper.safeApprove(tokenIn, UNISWAP_V2_ROUTER, amountInMax);

        address[] memory path = createPath(tokenIn, tokenOut);
        amounts = routerV2.swapTokensForExactTokens(
            amountOutDesired,
            amountInMax,
            path,
            caller,
            block.timestamp + deadlineInSeconds
        );

        // refund the change to caller
        if(amounts[0] < amountInMax){
            TransferHelper.safeApprove(tokenIn, UNISWAP_V2_ROUTER, 0);
            TransferHelper.safeTransfer(tokenIn, caller, amountInMax - amounts[0]);
        }
    }

    //3. ETH exact amount in, exact ETH -> token
    function V2SwapExactETHForTokens(
        address caller, 
        address tokenOut, 
        uint amountOutMin,
        uint deadlineInSeconds
    ) external payable returns (uint[] memory amounts)
    {
        address[] memory path = createPath(WETH, tokenOut);
        amounts = routerV2.swapExactETHForTokens{value: msg.value}(
            amountOutMin,
            path,
            caller,
            block.timestamp + deadlineInSeconds
        );
    }

    //4. ETH exact amount out, token -> exact ETH
    function V2SwapTokensForExactETH(
        address caller, 
        address tokenIn, 
        uint amountOut, 
        uint amountInMax,
        uint deadlineInSeconds
    ) external returns (uint[] memory amounts)
    {
        TransferHelper.safeTransferFrom(tokenIn, msg.sender, address(this), amountInMax);
        TransferHelper.safeApprove(tokenIn, UNISWAP_V2_ROUTER, amountInMax);

        address[] memory path = createPath(tokenIn, WETH);
        amounts = routerV2.swapTokensForExactETH(
            amountOut,
            amountInMax,
            path,
            caller,
            block.timestamp + deadlineInSeconds
        );

        // refund the change to caller
        if(amounts[0] < amountInMax){
            TransferHelper.safeApprove(tokenIn, UNISWAP_V2_ROUTER, 0);
            TransferHelper.safeTransfer(tokenIn, caller, amountInMax - amounts[0]);
        }
    }

    // 5. token exact amount in, exact token -> ETH
    function V2SwapExactTokensForETH(
        address caller, 
        address tokenIn, 
        uint amountIn, 
        uint amountOutMin,
        uint deadlineInSeconds
    ) external returns (uint[] memory amounts)
    {
        TransferHelper.safeTransferFrom(tokenIn, msg.sender, address(this), amountIn);
        TransferHelper.safeApprove(tokenIn, UNISWAP_V2_ROUTER, amountIn);

        address[] memory path = createPath(tokenIn, WETH);
        amounts = routerV2.swapExactTokensForETH(
            amountIn,
            amountOutMin,
            path,
            caller,
            block.timestamp + deadlineInSeconds
        );
    }

    // 6. token exact amout out, ETH -> exact token
    function V2SwapETHForExactTokens(
        address caller, 
        address tokenOut, 
        uint amountOut,
        uint deadlineInSeconds
    ) external payable returns (uint[] memory amounts)
    {
        address[] memory path = createPath(WETH, tokenOut);
        amounts = routerV2.swapETHForExactTokens{value: msg.value}(
            amountOut,
            path,
            caller,
            block.timestamp + deadlineInSeconds
        );
        // refund the change to caller
        if(amounts[0] < msg.value){
            TransferHelper.safeTransferETH(caller, msg.value - amounts[0]);
        }
    }

    // These functions below are for tokens that require fee when doing transactions
    // 7. token exact input -> token
    function V2SwapExactTokensForTokensSupportingFeeOnTransferTokens(
        address caller, 
        address tokenIn, 
        address tokenOut, 
        uint amountIn, 
        uint amountOutMin,
        uint deadlineInSeconds
    ) external 
    {
        TransferHelper.safeTransferFrom(tokenIn, msg.sender, address(this), amountIn);
        TransferHelper.safeApprove(tokenIn, UNISWAP_V2_ROUTER, amountIn);

        address[] memory path = createPath(tokenIn, tokenOut);
        routerV2.swapExactTokensForTokensSupportingFeeOnTransferTokens(
            amountIn,
            amountOutMin,
            path,
            caller,
            block.timestamp + deadlineInSeconds
        );
    }

    // 8. ETH exact input -> token
    function V2SwapExactETHForTokensSupportingFeeOnTransferTokens(
        address caller, 
        address tokenOut, 
        uint amountOutMin,
        uint deadlineInSeconds
    ) external payable
    {
        address[] memory path = createPath(WETH, tokenOut);
        routerV2.swapExactETHForTokensSupportingFeeOnTransferTokens{value: msg.value}(
            amountOutMin,
            path,
            caller,
            block.timestamp + deadlineInSeconds
        );
    }

    // 9. Token exact input -> ETH 
    function V2SwapExactTokensForETHSupportingFeeOnTransferTokens(
        address caller, 
        address tokenIn, 
        uint amountIn, 
        uint amountOutMin,
        uint deadlineInSeconds
    ) external
    {
        TransferHelper.safeTransferFrom(tokenIn, msg.sender, address(this), amountIn);
        TransferHelper.safeApprove(tokenIn, UNISWAP_V2_ROUTER, amountIn);

        address[] memory path = createPath(tokenIn, WETH);
        routerV2.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amountIn,
            amountOutMin,
            path,
            caller,
            block.timestamp + deadlineInSeconds
        );
    }


    // create path
    function createPath(address tokenIn, address tokenOut) private pure returns (address[] memory){
        address[] memory path = new address[](2);
        path[0] = tokenIn; //input token
        path[1] = tokenOut; //output token
        return path;
    }

    //---------------Uniswap V3 Starts Here----------------------//
    function V3SwapExactInputSingleHop(
        address caller, 
        address tokenIn, 
        address tokenOut,
        uint24 fee, 
        uint amountIn, 
        uint amountOutMin, 
        uint deadlineInSeconds,
        uint160 sqrtPriceLimitX96
    ) external returns (uint amountOut)
    {
        TransferHelper.safeTransferFrom(tokenIn, msg.sender, address(this), amountIn);
        TransferHelper.safeApprove(tokenIn, address(UNISWAP_V3_ROUTER), amountIn);
        

        ISwapV3Router.ExactInputSingleParams memory params = ISwapV3Router
            .ExactInputSingleParams({ 
                tokenIn: tokenIn,
                tokenOut: tokenOut,
                fee: fee,
                recipient: caller,
                deadline: block.timestamp + deadlineInSeconds,
                amountIn: amountIn,
                amountOutMinimum: amountOutMin,
                sqrtPriceLimitX96: sqrtPriceLimitX96
            });
        amountOut = routerV3.exactInputSingle(params);
    }

    function V3SwapExactOutputSingleHop(
        address caller, 
        address tokenIn, 
        address tokenOut, 
        uint24 fee, 
        uint amountOut, 
        uint amountInMax,
        uint deadlineInSeconds,
        uint160 sqrtPriceLimitX96
    ) external returns (uint amountIn)
    {
        TransferHelper.safeTransferFrom(tokenIn, msg.sender, address(this), amountInMax);
        TransferHelper.safeApprove(tokenIn, address(UNISWAP_V3_ROUTER), amountInMax);
        
        ISwapV3Router.ExactOutputSingleParams memory params = ISwapV3Router
            .ExactOutputSingleParams({
                tokenIn: tokenIn,
                tokenOut: tokenOut,
                fee: fee,
                recipient: caller,
                deadline: block.timestamp + deadlineInSeconds,
                amountOut: amountOut,
                amountInMaximum: amountInMax,
                sqrtPriceLimitX96: sqrtPriceLimitX96
            });
        amountIn = routerV3.exactOutputSingle(params);

        // refund to caller
        if (amountIn < amountInMax) {
            TransferHelper.safeApprove(tokenIn, address(UNISWAP_V3_ROUTER), 0);
            TransferHelper.safeTransfer(tokenIn, caller, amountInMax - amountIn);
        }
    }

    //---------------Universal Getter Functions----------------------//
    
    function checkETHBalance() external view returns (uint) {
        return address(this).balance;
    }

    function checkTokenBalance(address token) external view returns (uint){
        return IERC20(token).balanceOf(address(this));
    }

    function withdrawETH() external onlyOwner {
        uint amount = address(this).balance;

        emit WithdrawETH(amount, block.timestamp);
        TransferHelper.safeTransferETH(owner, amount);  
    }

    function withdrawToken(address token) external onlyOwner {
        uint amount = IERC20(token).balanceOf(address(this));
    
        emit WithdrawToken(token, amount, block.timestamp);
        TransferHelper.safeTransfer(token, owner, amount);    
    }

    function changeOwner(address newOwner) external onlyOwner {      
        require(newOwner != address(0), "new candidate can't be address zero");
        owner = newOwner;

        emit NewOwner(newOwner, block.timestamp);
    }
    receive() external payable {}
    fallback() external payable {}
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.18;

interface IERC20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address _owner) external view returns (uint256);

    function transfer(address to, uint256 amount) external;

    function allowance(
        address from,
        address to,
        uint256 amount
    ) external view returns (bool);

    function approve(address sender, uint256 amount) external;

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external;

    event Transfer(address indexed from, address indexed to, uint256 amount);

    event Approval(address indexed from, address indexed to, uint256 amount);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.18;

interface ISwapV2Router {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    //token exact amount in, token -> token 1
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);

    //token exact amount out, token -> token 2
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);

    //ETH exact amount in, exact ETH -> token 3
    function swapExactETHForTokens
    (uint amountOutMin, 
    address[] calldata path, 
    address to, 
    uint deadline
    ) external payable returns (uint[] memory amounts);

    //ETH exact amount out, token -> exact ETH 4
    function swapTokensForExactETH(
        uint amountOut, 
        uint amountInMax, 
        address[] calldata path, 
        address to, 
        uint deadline
        ) external returns (uint[] memory amounts);


    // token exact amount in, exact token -> ETH 5
    function swapExactTokensForETH(
        uint amountIn, 
        uint amountOutMin, 
        address[] calldata path, 
        address to, 
        uint deadline
        )
        external
        returns (uint[] memory amounts);

    // token exact amout out, ETH -> exact token 6
    function swapETHForExactTokens(
        uint amountOut, 
        address[] calldata path, 
        address to, 
        uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    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;

    // calculate maximum output token, useful for exact token -> token
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    // calculate minimum input token, useful for token -> exact token
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6;
pragma abicoder v2;

interface ISwapV3Router {
    struct ExactInputSingleParams {
        address tokenIn;
        address tokenOut;
        uint24 fee;
        address recipient;
        uint deadline;
        uint amountIn;
        uint amountOutMinimum;
        uint160 sqrtPriceLimitX96;
    }

    function exactInputSingle(ExactInputSingleParams calldata params)
        external
        payable
        returns (uint amountOut);

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

    function exactInput(ExactInputParams calldata params)
        external
        payable
        returns (uint amountOut);

    struct ExactOutputSingleParams {
        address tokenIn;
        address tokenOut;
        uint24 fee;
        address recipient;
        uint deadline;
        uint amountOut;
        uint amountInMaximum;
        uint160 sqrtPriceLimitX96;
    }

    function exactOutputSingle(ExactOutputSingleParams calldata params)
        external
        payable
        returns (uint amountIn);

    struct ExactOutputParams {
        bytes path;
        address recipient;
        uint deadline;
        uint amountOut;
        uint amountInMaximum;
    }

    function exactOutput(ExactOutputParams calldata params)
        external
        payable
        returns (uint amountIn);
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.8.18;

interface IWETH {
    function deposit() external payable;

    function withdraw(uint) external;

    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);
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.7.16;

import '../interfaces/IERC20.sol';

library TransferHelper {
    /// @notice Transfers tokens from the targeted address to the given destination
    /// @notice Errors with 'STF' if transfer fails
    /// @param token The contract address of the token to be transferred
    /// @param from The originating address from which the tokens will be transferred
    /// @param to The destination address of the transfer
    /// @param value The amount to be transferred
    function safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) internal {
        (bool success, bytes memory data) =
            token.call(abi.encodeWithSelector(IERC20.transferFrom.selector, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'STF');
    }

    /// @notice Transfers tokens from msg.sender to a recipient
    /// @dev Errors with ST if transfer fails
    /// @param token The contract address of the token which will be transferred
    /// @param to The recipient of the transfer
    /// @param value The value of the transfer
    function safeTransfer(
        address token,
        address to,
        uint256 value
    ) internal {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(IERC20.transfer.selector, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'ST');
    }

    /// @notice Approves the stipulated contract to spend the given allowance in the given token
    /// @dev Errors with 'SA' if transfer fails
    /// @param token The contract address of the token to be approved
    /// @param to The target of the approval
    /// @param value The amount of the given token the target will be allowed to spend
    function safeApprove(
        address token,
        address to,
        uint256 value
    ) internal {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(IERC20.approve.selector, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'SA');
    }

    /// @notice Transfers ETH to the recipient address
    /// @dev Fails with `STE`
    /// @param to The destination of the transfer
    /// @param value The value to be transferred
    function safeTransferETH(address to, uint256 value) internal {
        (bool success, ) = to.call{value: value}(new bytes(0));
        require(success, 'STE');
    }
}

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

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"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"amountInMax","type":"uint256"},{"internalType":"uint256","name":"deadlineInSeconds","type":"uint256"}],"name":"V2SwapTokensForExactETH","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"caller","type":"address"},{"internalType":"address","name":"tokenIn","type":"address"},{"internalType":"address","name":"tokenOut","type":"address"},{"internalType":"uint256","name":"amountOutDesired","type":"uint256"},{"internalType":"uint256","name":"amountInMax","type":"uint256"},{"internalType":"uint256","name":"deadlineInSeconds","type":"uint256"}],"name":"V2SwapTokensForExactTokens","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"caller","type":"address"},{"internalType":"address","name":"tokenIn","type":"address"},{"internalType":"address","name":"tokenOut","type":"address"},{"internalType":"uint24","name":"fee","type":"uint24"},{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"uint256","name":"deadlineInSeconds","type":"uint256"},{"internalType":"uint160","name":"sqrtPriceLimitX96","type":"uint160"}],"name":"V3SwapExactInputSingleHop","outputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"caller","type":"address"},{"internalType":"address","name":"tokenIn","type":"address"},{"internalType":"address","name":"tokenOut","type":"address"},{"internalType":"uint24","name":"fee","type":"uint24"},{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"amountInMax","type":"uint256"},{"internalType":"uint256","name":"deadlineInSeconds","type":"uint256"},{"internalType":"uint160","name":"sqrtPriceLimitX96","type":"uint160"}],"name":"V3SwapExactOutputSingleHop","outputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"WETH","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"changeOwner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"checkETHBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"checkTokenBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdrawETH","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"withdrawToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2

-----Decoded View---------------
Arg [0] : _WETH (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2