// SPDX-License-Identifier: MIT

pragma solidity 0.8.20;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
	
    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

interface IERC20 {
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
	
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address to, 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 from, address to, uint256 amount) external returns (bool);
}

interface IERC20Metadata is IERC20 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
}

contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
  
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    function name() public view virtual override returns (string memory) {
        return _name;
    }
	
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }
	
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }
	
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }
	
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }
	
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }
	
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }
	
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }
	
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }
	
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }
	
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }
	
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }
	
    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;
        emit Approval(owner, spender, amount);
    }
	
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }
	
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

interface IDEXFactory {
  function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface IDEXRouter {
   function factory() external pure returns (address);
   function WETH() external pure returns (address);
   function swapExactTokensForETHSupportingFeeOnTransferTokens(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline) external;
}

contract Frinkcoin is ERC20 {
	bool private swapping;
	
	uint256 public immutable sellTax;
	uint256 public swapThreshold;
	
	uint256 public immutable buyTax;
	address private immutable taxAddress;
	
	address public immutable pair;
	IDEXRouter public immutable router;
	
    constructor() ERC20("Frinkcoin", "FRINK") {
	    router = IDEXRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        pair = IDEXFactory(router.factory()).createPair(address(this), router.WETH());
		
		taxAddress = payable(0xafAB88cb29F0137262f67c16882f13c94592A1A1);

	    sellTax = 166;
		buyTax = 166;
		
		swapThreshold = 13 * 10**8 * 10**decimals();
		
        _mint(_msgSender(), 13 * 10**12 * 10**decimals());
    }

	receive() external payable {}
	
	function burn(uint256 amount) external {
        _burn(_msgSender(), amount);
		swapThreshold = totalSupply() / 10000;
    }
	
	function _transfer(address sender, address recipient, uint256 amount) internal override(ERC20) {      
	
		uint256 tokenBalance = balanceOf(address(this));
		
		if(!swapping && tokenBalance >= swapThreshold && recipient == pair) 
		{
			swapping = true;
			swapTokensForETH(tokenBalance);
			swapping = false; 
		}
		if(recipient == pair && sender != address(this))
		{
		   uint256 tax = ((amount * sellTax) / 10000);
		   super._transfer(sender, address(this), tax);
		   super._transfer(sender, recipient, amount - tax);
		}
		else if(sender == pair)
		{
		   uint256 tax = ((amount * buyTax) / 10000);
		   super._transfer(sender, address(this), tax);
		   super._transfer(sender, recipient, amount - tax);
		}
		else
		{
		   super._transfer(sender, recipient, amount);
		}
    }
	
	function swapTokensForETH(uint256 amount) private {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = router.WETH();
		
        _approve(address(this), address(router), amount);
        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amount,
            0,
            path,
            address(taxAddress),
            block.timestamp
        );
    }
}