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// SPDX-License-Identifier: MIT

pragma solidity 0.8.13;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

interface IUniswapV2Router02 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );
}

contract MyToken is ERC20
{    
    address public liquidityWallet;

    IUniswapV2Router02 router;

    uint public feeDecimal = 2;
    uint public feePercentage;

    uint public feesCollected;
    uint256 public minTokensBeforeSwap;

    mapping(address => bool) public isTaxless;

    bool private isInFeeTransfer = false;

    constructor () ERC20("My Token", "TKN")
    {
        router = IUniswapV2Router02(0xa5E0829CaCEd8fFDD4De3c43696c57F7D7A678ff);

        // Edit here
        liquidityWallet = 0xb6F5414bAb8d5ad8F33E37591C02f7284E974FcB;
        uint supply = 1_000_000 ether;
        feePercentage = 1000; // 10.00% tx fee
        minTokensBeforeSwap = 300 ether;
        // End edit

        isTaxless[msg.sender] = true;
        isTaxless[liquidityWallet] = true;
        isTaxless[address(this)] = true;
        isTaxless[address(0)] = true;

        _mint(msg.sender, supply);
    }

    function _afterTokenTransfer(
        address from,
        address to,
        uint amount
    ) internal virtual override(ERC20)
    {
        super._afterTokenTransfer(from, to, amount);

        if(!isInFeeTransfer)
        {
            if(feesCollected >= minTokensBeforeSwap)
            {
                isInFeeTransfer = true;
                autoLiquidity();
                isInFeeTransfer = false;
            }
            uint currentFeesCollected;
            if (!isTaxless[from]) {
                currentFeesCollected = calculateFee(amount);
            }

            if(currentFeesCollected > 0)
            {
                isInFeeTransfer = true;
                _transfer(to, address(this), currentFeesCollected);
                feesCollected += currentFeesCollected;
                isInFeeTransfer = false;
            }
        }
    }

    function autoLiquidity() public
    {
        // How much are we swaping?
        uint amountToSwap = feesCollected / 2;
        uint amountTokensToLiquidity = feesCollected - amountToSwap;
        
        // Let's swap for eth now
        address[] memory sellPath = new address[](2);
        sellPath[0] = address(this);
        sellPath[1] = router.WETH();       

        _approve(address(this), address(router), amountToSwap);
        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amountToSwap,
            0,
            sellPath,
            address(this),
            block.timestamp
        );

        // Send to LP
        uint256 amountETHLiquidity = address(this).balance;
        if(amountTokensToLiquidity > 0) {
            _approve(address(this), address(router), amountTokensToLiquidity);
            router.addLiquidityETH{value: amountETHLiquidity}(
                address(this),
                amountTokensToLiquidity,
                0,
                0,
                liquidityWallet,
                block.timestamp
            );
        }
        feesCollected = 0;
    }

    function calculateFee(uint amount) internal view returns(uint) {
        return (amount * feePercentage)  / (10**(feeDecimal + 2));
    }

    fallback() external payable {}
    receive() external payable {}
}