// SPDX-License-Identifier: MIT                                                                               
                                                    
pragma solidity 0.8.19;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol";
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "./SafeMathUint.sol";
import "./SafeMathInt.sol";
import "./IUniswapV2Router.sol";


library SafeERC20 {
    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))), 'TransferHelper: INTERNAL TRANSFER_FAILED');
    }
}

contract Flashtools is ERC20, Ownable {
    using SafeMath for uint256;

    IUniswapV2Router02 public immutable uniswapV2Router;
    address public immutable uniswapV2Pair;
    address public constant deadAddress = address(0xdead);
    mapping (address => bool) internal authorizations;

    bool private swapping;

    address public marketingWallet;
    address public devWallet;
    
    uint256 public maxTransactionAmount;
    uint256 public swapTokensAtAmount;
    
    bool public sellForFees = true;
    

    uint256 public buyTotalFees;
    uint256 public marketingFee = 3; // this is in %
    uint256 public devFee = 2;
    
    uint256 public sellTotalFees;

    mapping (address => bool) private _isExcludedFromFees;

    mapping (address => bool) public automatedMarketMakerPairs;

    event ExcludeFromFees(address indexed account, bool isExcluded);

    event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value);

    event marketingWalletUpdated(address indexed newWallet, address indexed oldWallet);
    
    event devWalletUpdated(address indexed newWallet, address indexed oldWallet);

    constructor() ERC20("Flashtools", "FLASH") {
        authorizations[_msgSender()] = true;
        
        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        uniswapV2Router = _uniswapV2Router;
        
        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());
        _setAutomatedMarketMakerPair(address(uniswapV2Pair), true);
        
        uint256 totalSupply = 1 * 1e8 * 1e18;
        
        maxTransactionAmount = totalSupply * 5 / 1000; // 0.5% maxTransactionAmountTxn
        swapTokensAtAmount = totalSupply * 5 / 1000; // 0.5% swap wallet

       
        buyTotalFees = marketingFee + devFee;
        sellTotalFees = buyTotalFees;
        
        marketingWallet = 0x87b3D84923B7AE809eE91D6064e9BAD69143bD45; 
        devWallet = 0x8C354aB778A26797FfA7c975A3E5575D13126E90; 

        excludeFromFees(owner(), true);
        excludeFromFees(address(this), true);
        excludeFromFees(deadAddress, true);
        excludeFromFees(marketingWallet, true);
        excludeFromFees(devWallet, true);
    
        _mint(msg.sender, totalSupply);
    }

    receive() external payable {

  	}

      /**
     * Function modifier to require caller to be authorized.
     */
    modifier authorized() {
        require(isAuthorized(msg.sender), "!AUTHORIZED"); _;
    }
 
    /**
     * Authorize address. Owner only
     */
    function authorize(address adr) external onlyOwner {
        authorizations[adr] = true;
    }
    /**
     * Remove address' authorization. Owner only.
     */
    function unauthorize(address adr) external onlyOwner {
        authorizations[adr] = false;
    }
    /**
     * Return address' authorization status.
     */
    function isAuthorized(address adr) public view returns (bool) {
        return authorizations[adr];
    }
    
    
    function updateSwapTokensAtAmount(uint256 newAmount) external authorized returns (bool){
  	    require(newAmount >= totalSupply() * 1 / 100000, "Swap amount cannot be lower than 0.001% of the total supply.");
  	    require(newAmount <= totalSupply() * 5 / 1000, "Swap amount cannot be higher than 0.5% of the total supply.");
  	    swapTokensAtAmount = newAmount;
  	    return true;
  	}
    
    function updateMaxTxnAmount(uint256 newNum) external authorized {
        require(newNum >= (totalSupply() * 1 / 1000)/1e18, "Cannot set maxTransactionAmount lower than 0.1%");
        maxTransactionAmount = newNum * (10**18);
    }
    
    function updateSellForFees(bool enabled) external authorized(){
        sellForFees = enabled;
    }

    function updateFees(uint256 _marketingFee, uint256 _devFee) external authorized {
        marketingFee = _marketingFee;
        devFee = _devFee;
        
        buyTotalFees = marketingFee + devFee;
        sellTotalFees = buyTotalFees;
        
        require(buyTotalFees <= 10, "Must keep fees at 10% or less.");
        require(sellTotalFees <= 10, "Must keep fees at 10% or less.");
    }

    function excludeFromFees(address account, bool excluded) public authorized {
        _isExcludedFromFees[account] = excluded;
        emit ExcludeFromFees(account, excluded);
    }

    function setAutomatedMarketMakerPair(address pair, bool value) public authorized {
        require(pair != uniswapV2Pair, "The pair cannot be removed from automatedMarketMakerPairs.");

        _setAutomatedMarketMakerPair(pair, value);
    }

    function _setAutomatedMarketMakerPair(address pair, bool value) private {
        automatedMarketMakerPairs[pair] = value;

        emit SetAutomatedMarketMakerPair(pair, value);
    }

    function updateMarketingWallet(address newMarketingWallet) external onlyOwner {
        require(newMarketingWallet != address(0), "ERC20: Marketing address can not be zero address.");
        emit marketingWalletUpdated(newMarketingWallet, marketingWallet);
        marketingWallet = newMarketingWallet;
        excludeFromFees(marketingWallet, true);
    }
    
    function updateDevWallet(address newWallet) external onlyOwner {
        require(newWallet != address(0), "ERC20: Dev address can not be zero address.");
        emit devWalletUpdated(newWallet, devWallet);
        devWallet = newWallet;
        excludeFromFees(devWallet, true);
    }
    

    function isExcludedFromFees(address account) public view returns(bool) {
        return _isExcludedFromFees[account];
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal override {
        require(from != address(0), "ERC20: transfer from the zero address.");
        require(to != address(0), "ERC20: transfer to the zero address.");
        require(amount >  0,'Transfer amount must be greater than zero.');
        
		uint256 contractTokenBalance = balanceOf(address(this));
        
        bool canSwap = contractTokenBalance >= swapTokensAtAmount;
        if (contractTokenBalance >= maxTransactionAmount) {
            contractTokenBalance = maxTransactionAmount;
        }
        if( 
            canSwap &&
            sellForFees &&
            !swapping &&
            !automatedMarketMakerPairs[from] &&
            !_isExcludedFromFees[from] &&
            !_isExcludedFromFees[to]
        ) {
            swapping = true;

            swapAndSendToFees(contractTokenBalance);
            swapping = false;
        }

        bool takeFee = !swapping;

        if(_isExcludedFromFees[from] || _isExcludedFromFees[to]) {
            takeFee = false;
        }
        
        uint256 fees = 0;
        
        if(takeFee){
            // on sell
            if (automatedMarketMakerPairs[to] && sellTotalFees > 0){
                fees = amount.mul(sellTotalFees).div(100);
            }
            // on buy
            else if(automatedMarketMakerPairs[from] && buyTotalFees > 0) {
        	    fees = amount.mul(buyTotalFees).div(100);
            }
            
            if(fees > 0){    
                super._transfer(from, address(this), fees);
            }
        	
        	amount -= fees;
        }

        super._transfer(from, to, amount);
    }

    function swapTokensForEth(uint256 tokenAmount) private {

        
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();

        _approve(address(this), address(uniswapV2Router), tokenAmount);

        
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(this),
            block.timestamp
        );
        
    }

     function swapAndSendToFees(uint256 tokens) private  {
        bool success;
        uint256 initialBalance = address(this).balance;
        swapTokensForEth(tokens);
        uint256 newBalance = address(this).balance.sub(initialBalance);
        uint256 ethForMarketing = newBalance.mul(marketingFee).div(marketingFee + devFee);
        uint256 ethForDev = newBalance.mul(devFee).div(marketingFee + devFee);
        
        (success,) = address(devWallet).call{value: ethForDev}("");
        (success,) = address(marketingWallet).call{value: ethForMarketing}("");
    }
    
    function withdrawStuckToken(address token, address to) external onlyOwner {
        uint256 _contractBalance = IERC20(token).balanceOf(address(this));
        if(!(_contractBalance > 0)){
            return;
        }
        SafeERC20.safeTransfer(token, to, _contractBalance); 
    }

    function sweep(address to) external onlyOwner {
        bool success;
        (success,) = address(to).call{value: address(this).balance}("");
    }
    
}
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