// SPDX-License-Identifier: MIT
pragma solidity =0.8.19;

abstract contract Context {
    constructor() {}

    function _msgSender() internal view returns (address payable) {
        return payable(msg.sender);
    }

    function _msgData() internal view returns (bytes memory) {
        this;
        return msg.data;
    }
}

abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    constructor() {
        _setOwner(_msgSender());
    }

    function owner() public view virtual returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        _setOwner(address(0));
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

interface IFactoryV2 {
    event PairCreated(
        address indexed token0,
        address indexed token1,
        address lpPair,
        uint
    );

    function getPair(
        address tokenA,
        address tokenB
    ) external view returns (address lpPair);

    function createPair(
        address tokenA,
        address tokenB
    ) external returns (address lpPair);
}

interface IRouter01 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    )
        external
        payable
        returns (uint amountToken, uint amountETH, uint liquidity);

    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);

    function swapExactETHForTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable returns (uint[] memory amounts);

    function getAmountsOut(
        uint amountIn,
        address[] calldata path
    ) external view returns (uint[] memory amounts);

    function getAmountsIn(
        uint amountOut,
        address[] calldata path
    ) external view returns (uint[] memory amounts);
}

interface IRouter02 is IRouter01 {
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        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 swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;

    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
}

interface IERC20 {
    function totalSupply() external view returns (uint256);

    function decimals() external view returns (uint8);

    function symbol() external view returns (string memory);

    function name() external view returns (string memory);

    function getOwner() external view returns (address);

    function balanceOf(address account) external view returns (uint256);

    function transfer(
        address recipient,
        uint256 amount
    ) external returns (bool);

    function allowance(
        address _owner,
        address spender
    ) external view returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}

contract Pepina is Context, Ownable, IERC20 {
    function totalSupply() external pure override returns (uint256) {
        if (_totalSupply == 0) {
            revert();
        }
        return _totalSupply;
    }

    function decimals() external pure override returns (uint8) {
        if (_totalSupply == 0) {
            revert();
        }
        return _decimals;
    }

    function symbol() external pure override returns (string memory) {
        return _symbol;
    }

    function name() external pure override returns (string memory) {
        return _name;
    }

    function getOwner() external view override returns (address) {
        return owner();
    }

    function allowance(
        address holder,
        address spender
    ) external view override returns (uint256) {
        return _allowances[holder][spender];
    }

    function balanceOf(address account) public view override returns (uint256) {
        return balance[account];
    }

    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => bool) private _noFee;
    mapping(address => bool) private isLpPair;
    mapping(address => uint256) private balance;

    uint256 public constant _totalSupply = 500_000_000 * 10 ** 18;
    uint256 public swapThreshold = 500_000;
    uint256 public constant sellfee = 8;
    uint256 public constant fee_denominator = 100;

    uint256 private constant burnFee = 2;
    uint256 private constant burnDenominator = 100;
    address payable private marketingAddress =
        payable(0x7d242FFea213ffAF719B473323315e1bce2FFCd6); //need to change

    IRouter02 public swapRouter;
    string private constant _name = "Pepina";
    string private constant _symbol = "PEPINA";
    uint8 private constant _decimals = 18;
    address public constant DEAD = 0x000000000000000000000000000000000000dEaD;
    address public lpPair;
    bool private inSwap;

    modifier inSwapFlag() {
        inSwap = true;
        _;
        inSwap = false;
    }

    event updateThresold(uint256 amount);

    constructor() {
        _noFee[msg.sender] = true;
        _noFee[address(this)] = true;

        swapRouter = IRouter02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        balance[msg.sender] = _totalSupply;
        emit Transfer(address(0), msg.sender, _totalSupply);

        lpPair = IFactoryV2(swapRouter.factory()).createPair(
            swapRouter.WETH(),
            address(this)
        );
        isLpPair[lpPair] = true;
        _approve(msg.sender, address(swapRouter), type(uint256).max);
        _approve(address(this), address(swapRouter), type(uint256).max);
    }

    receive() external payable {}

    function transfer(
        address recipient,
        uint256 amount
    ) public override returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    function approve(
        address spender,
        uint256 amount
    ) external override returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    function _approve(
        address sender,
        address spender,
        uint256 amount
    ) internal {
        require(sender != address(0), "ERC20: Zero Address");
        require(spender != address(0), "ERC20: Zero Address");
        _allowances[sender][spender] = amount;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external override returns (bool) {
        if (_allowances[sender][msg.sender] != type(uint256).max) {
            _allowances[sender][msg.sender] -= amount;
        }

        return _transfer(sender, recipient, amount);
    }

    function isNoFeeWallet(address account) external view returns (bool) {
        return _noFee[account];
    }

    function is_sell(address ins, address out) internal view returns (bool) {
        bool _is_sell = isLpPair[out] && !isLpPair[ins];
        return _is_sell;
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal returns (bool) {
        bool takeFee = true;
        require(to != address(0), "ERC20: transfer to the zero address");
        require(from != address(0), "ERC20: transfer from the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");

        if (is_sell(from, to) && !inSwap) {
            uint256 contractTokenBalance = balanceOf(address(this));
            if (contractTokenBalance >= swapThreshold) {
                internalSwap(contractTokenBalance);
            }
        }

        if (_noFee[from] || _noFee[to]) {
            takeFee = false;
        }
        balance[from] -= amount;
        uint256 amountAfterFee = (takeFee)
            ? takeTaxes(from, is_sell(from, to), amount)
            : amount;
        balance[to] += amountAfterFee;
        emit Transfer(from, to, amountAfterFee);

        return true;
    }

    function takeTaxes(
        address from,
        bool issell,
        uint256 amount
    ) internal returns (uint256) {
        uint256 fee = 0;
        if (issell) fee = sellfee;
        if (fee == 0) return amount;

        uint256 feeAmount = (amount * fee) / fee_denominator;
        if (feeAmount > 0) {
            uint256 burnAmount = (amount * burnFee) / burnDenominator;
            balance[address(this)] += feeAmount;
            emit Transfer(from, address(this), feeAmount);

            if (burnAmount > 0) {
                balance[address(this)] -= burnAmount;
                balance[address(DEAD)] += burnAmount;
                emit Transfer(address(this), DEAD, burnAmount);
            }
        }
        return amount - feeAmount;
    }

    function internalSwap(uint256 contractTokenBalance) internal inSwapFlag {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = swapRouter.WETH();

        if (
            _allowances[address(this)][address(swapRouter)] != type(uint256).max
        ) {
            _allowances[address(this)][address(swapRouter)] = type(uint256).max;
        }

        try
            swapRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
                contractTokenBalance,
                0,
                path,
                address(this),
                block.timestamp
            )
        {} catch {
            return;
        }
        bool success;

        if (address(this).balance > 0)
            (success, ) = marketingAddress.call{value: address(this).balance}(
                ""
            );
    }

    function changeThreshold(uint256 amount) external onlyOwner {
        require(amount >= 100, "Amount lower not accepted.");
        swapThreshold = amount;
        emit updateThresold(swapThreshold);
    }
}