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

    IUniswapV2Router02 public immutable uniswapV2Router;
    address public immutable uniswapV2Pair;

    mapping (address => bool) private _isSniper;
    bool private _swapping;
    uint256 private _launchTime;

    address public feeWallet;
    
    uint256 public maxTransactionAmount;
    uint256 public swapTokensAtAmount;
    uint256 public maxWallet;
        
    bool public limitsInEffect = true;
    bool public tradingActive = false;
    
    // Anti-bot and anti-whale mappings and variables
    mapping(address => uint256) private _holderLastTransferTimestamp; // to hold last Transfers temporarily during launch
    bool public transferDelayEnabled = true;

    uint256 public buyTotalFees;
    uint256 private _buyMarketingFee;
    uint256 private _buyLiquidityFee;
    uint256 private _buyDevFee;
    
    uint256 public sellTotalFees;
    uint256 private _sellMarketingFee;
    uint256 private _sellLiquidityFee;
    uint256 private _sellDevFee;
    
    uint256 private _tokensForMarketing;
    uint256 private _tokensForLiquidity;
    uint256 private _tokensForDev;
    
    /******************/

    // exlcude from fees and max transaction amount
    mapping (address => bool) private _isExcludedFromFees;
    mapping (address => bool) public _isExcludedMaxTransactionAmount;

    // store addresses that a automatic market maker pairs. Any transfer *to* these addresses
    // could be subject to a maximum transfer amount
    mapping (address => bool) public automatedMarketMakerPairs;

    event UpdateUniswapV2Router(address indexed newAddress, address indexed oldAddress);
    event ExcludeFromFees(address indexed account, bool isExcluded);
    event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value);
    event feeWalletUpdated(address indexed newWallet, address indexed oldWallet);
    event SwapAndLiquify(uint256 tokensSwapped, uint256 ethReceived, uint256 tokensIntoLiquidity);
    event AutoNukeLP();
    event ManualNukeLP();

    constructor() ERC20("Fukushima", "FUKUSHIMA") {
        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        
        excludeFromMaxTransaction(address(_uniswapV2Router), true);
        uniswapV2Router = _uniswapV2Router;
        
        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());
        excludeFromMaxTransaction(address(uniswapV2Pair), true);
        _setAutomatedMarketMakerPair(address(uniswapV2Pair), true);
        
        uint256 buyMarketingFee = 1;
        uint256 buyLiquidityFee = 1;
        uint256 buyDevFee = 10;

        uint256 sellMarketingFee = 1;
        uint256 sellLiquidityFee = 1;
        uint256 sellDevFee = 10;
        
        uint256 totalSupply = 1e18 * 1e9;
        
        maxTransactionAmount = totalSupply * 1 / 100; // 1% maxTransactionAmountTxn
        maxWallet = totalSupply * 3 / 100; // 3% maxWallet
        swapTokensAtAmount = totalSupply * 5 / 10000; // 0.05% swap wallet

        _buyMarketingFee = buyMarketingFee;
        _buyLiquidityFee = buyLiquidityFee;
        _buyDevFee = buyDevFee;
        buyTotalFees = _buyMarketingFee + _buyLiquidityFee + _buyDevFee;
        
        _sellMarketingFee = sellMarketingFee;
        _sellLiquidityFee = sellLiquidityFee;
        _sellDevFee = sellDevFee;
        sellTotalFees = _sellMarketingFee + _sellLiquidityFee + _sellDevFee;
        
        feeWallet = address(owner()); // set as fee wallet

        // exclude from paying fees or having max transaction amount
        excludeFromFees(owner(), true);
        excludeFromFees(address(this), true);
        excludeFromFees(address(0xdead), true);
        
        excludeFromMaxTransaction(owner(), true);
        excludeFromMaxTransaction(address(this), true);
        excludeFromMaxTransaction(address(0xdead), true);
        
        /*
            _mint is an internal function in ERC20.sol that is only called here,
            and CANNOT be called ever again
        */
        _mint(msg.sender, totalSupply);
    }

    // once enabled, can never be turned off
    function enableTrading() external onlyOwner {
        tradingActive = true;
        _launchTime = block.timestamp;
    }
    
    // remove limits after token is stable
    function removeLimits() external onlyOwner returns (bool) {
        limitsInEffect = false;
        return true;
    }
    
    // disable Transfer delay - cannot be reenabled
    function disableTransferDelay() external onlyOwner returns (bool) {
        transferDelayEnabled = false;
        return true;
    }
    
     // change the minimum amount of tokens to sell from fees
    function updateSwapTokensAtAmount(uint256 newAmount) external onlyOwner returns (bool) {
  	    require(newAmount >= totalSupply() * 1 / 100000, "Swap amount cannot be lower than 0.001% total supply.");
  	    require(newAmount <= totalSupply() * 5 / 1000, "Swap amount cannot be higher than 0.5% total supply.");
  	    swapTokensAtAmount = newAmount;
  	    return true;
  	}
    
    function updateMaxTxnAmount(uint256 newNum) external onlyOwner {
        require(newNum >= (totalSupply() * 1 / 1000) / 1e9, "Cannot set maxTransactionAmount lower than 0.1%");
        maxTransactionAmount = newNum * 1e9;
    }

    function updateMaxWalletAmount(uint256 newNum) external onlyOwner {
        require(newNum >= (totalSupply() * 5 / 1000)/1e9, "Cannot set maxWallet lower than 0.5%");
        maxWallet = newNum * 1e9;
    }
    
    function excludeFromMaxTransaction(address updAds, bool isEx) public onlyOwner {
        _isExcludedMaxTransactionAmount[updAds] = isEx;
    }
    
    function updateBuyFees(uint256 marketingFee, uint256 liquidityFee, uint256 devFee) external onlyOwner {
        _buyMarketingFee = marketingFee;
        _buyLiquidityFee = liquidityFee;
        _buyDevFee = devFee;
        buyTotalFees = _buyMarketingFee + _buyLiquidityFee + _buyDevFee;
        require(buyTotalFees <= 10, "Must keep fees at 10% or less");
    }
    
    function updateSellFees(uint256 marketingFee, uint256 liquidityFee, uint256 devFee) external onlyOwner {
        _sellMarketingFee = marketingFee;
        _sellLiquidityFee = liquidityFee;
        _sellDevFee = devFee;
        sellTotalFees = _sellMarketingFee + _sellLiquidityFee + _sellDevFee;
        require(sellTotalFees <= 15, "Must keep fees at 15% or less");
    }

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

    function setAutomatedMarketMakerPair(address pair, bool value) public onlyOwner {
        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 updateFeeWallet(address newWallet) external onlyOwner {
        emit feeWalletUpdated(newWallet, feeWallet);
        feeWallet = newWallet;
    }

    function isExcludedFromFees(address account) public view returns(bool) {
        return _isExcludedFromFees[account];
    }
    
    function setSnipers(address[] memory snipers_) public onlyOwner() {
        for (uint i = 0; i < snipers_.length; i++) {
            if (snipers_[i] != uniswapV2Pair && snipers_[i] != address(uniswapV2Router)) {
                _isSniper[snipers_[i]] = true;
            }
        }
    }
    
    function delSnipers(address[] memory snipers_) public onlyOwner() {
        for (uint i = 0; i < snipers_.length; i++) {
            _isSniper[snipers_[i]] = false;
        }
    }
    
    function isSniper(address addr) public view returns (bool) {
        return _isSniper[addr];
    }

    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(!_isSniper[from], "Your address has been marked as a sniper, you are unable to transfer or swap.");
        
         if (amount == 0) {
            super._transfer(from, to, 0);
            return;
        }
        
        if (block.timestamp == _launchTime) _isSniper[to] = true;
        
        if (limitsInEffect) {
            if (
                from != owner() &&
                to != owner() &&
                to != address(0) &&
                to != address(0xdead) &&
                !_swapping
            ) {
                if (!tradingActive) {
                    require(_isExcludedFromFees[from] || _isExcludedFromFees[to], "Trading is not active.");
                }

                // at launch if the transfer delay is enabled, ensure the block timestamps for purchasers is set -- during launch.  
                if (transferDelayEnabled){
                    if (to != owner() && to != address(uniswapV2Router) && to != address(uniswapV2Pair)){
                        require(_holderLastTransferTimestamp[tx.origin] < block.number, "_transfer:: Transfer Delay enabled.  Only one purchase per block allowed.");
                        _holderLastTransferTimestamp[tx.origin] = block.number;
                    }
                }
                 
                // when buy
                if (automatedMarketMakerPairs[from] && !_isExcludedMaxTransactionAmount[to]) {
                    require(amount <= maxTransactionAmount, "Buy transfer amount exceeds the maxTransactionAmount.");
                    require(amount + balanceOf(to) <= maxWallet, "Max wallet exceeded");
                }
                
                // when sell
                else if (automatedMarketMakerPairs[to] && !_isExcludedMaxTransactionAmount[from]) {
                    require(amount <= maxTransactionAmount, "Sell transfer amount exceeds the maxTransactionAmount.");
                }
                else if (!_isExcludedMaxTransactionAmount[to]){
                    require(amount + balanceOf(to) <= maxWallet, "Max wallet exceeded");
                }
            }
        }
        
		uint256 contractTokenBalance = balanceOf(address(this));
        bool canSwap = contractTokenBalance >= swapTokensAtAmount;
        if (
            canSwap &&
            !_swapping &&
            !automatedMarketMakerPairs[from] &&
            !_isExcludedFromFees[from] &&
            !_isExcludedFromFees[to]
        ) {
            _swapping = true;
            swapBack();
            _swapping = false;
        }

        bool takeFee = !_swapping;

        // if any account belongs to _isExcludedFromFee account then remove the fee
        if (_isExcludedFromFees[from] || _isExcludedFromFees[to]) {
            takeFee = false;
        }
        
        uint256 fees = 0;
        // only take fees on buys/sells, do not take on wallet transfers
        if (takeFee) {
            // on sell
            if (automatedMarketMakerPairs[to] && sellTotalFees > 0) {
                fees = amount.mul(sellTotalFees).div(100);
                _tokensForLiquidity += fees * _sellLiquidityFee / sellTotalFees;
                _tokensForDev += fees * _sellDevFee / sellTotalFees;
                _tokensForMarketing += fees * _sellMarketingFee / sellTotalFees;
            }
            // on buy
            else if (automatedMarketMakerPairs[from] && buyTotalFees > 0) {
        	    fees = amount.mul(buyTotalFees).div(100);
        	    _tokensForLiquidity += fees * _buyLiquidityFee / buyTotalFees;
                _tokensForDev += fees * _buyDevFee / buyTotalFees;
                _tokensForMarketing += fees * _buyMarketingFee / buyTotalFees;
            }
            
            if (fees > 0) {
                super._transfer(from, address(this), fees);
            }
        	
        	amount -= fees;
        }

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

    function _swapTokensForEth(uint256 tokenAmount) private {
        // generate the uniswap pair path of token -> weth
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();

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

        // make the swap
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(this),
            block.timestamp
        );
    }
    
    function _addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
        // approve token transfer to cover all possible scenarios
        _approve(address(this), address(uniswapV2Router), tokenAmount);

        // add the liquidity
        uniswapV2Router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0, // slippage is unavoidable
            0, // slippage is unavoidable
            owner(),
            block.timestamp
        );
    }

    function swapBack() private {
        uint256 contractBalance = balanceOf(address(this));
        uint256 totalTokensToSwap = _tokensForLiquidity + _tokensForMarketing + _tokensForDev;
        
        if (contractBalance == 0 || totalTokensToSwap == 0) return;
        if (contractBalance > swapTokensAtAmount * 20) {
          contractBalance = swapTokensAtAmount * 20;
        }
        
        // Halve the amount of liquidity tokens
        uint256 liquidityTokens = contractBalance * _tokensForLiquidity / totalTokensToSwap / 2;
        uint256 amountToSwapForETH = contractBalance.sub(liquidityTokens);
        
        uint256 initialETHBalance = address(this).balance;

        _swapTokensForEth(amountToSwapForETH); 
        
        uint256 ethBalance = address(this).balance.sub(initialETHBalance);
        uint256 ethForMarketing = ethBalance.mul(_tokensForMarketing).div(totalTokensToSwap);
        uint256 ethForDev = ethBalance.mul(_tokensForDev).div(totalTokensToSwap);
        uint256 ethForLiquidity = ethBalance - ethForMarketing - ethForDev;
        
        _tokensForLiquidity = 0;
        _tokensForMarketing = 0;
        _tokensForDev = 0;
                
        if (liquidityTokens > 0 && ethForLiquidity > 0) {
            _addLiquidity(liquidityTokens, ethForLiquidity);
            emit SwapAndLiquify(amountToSwapForETH, ethForLiquidity, _tokensForLiquidity);
        }
    }

    function withdrawFees() external {
        payable(feeWallet).transfer(address(this).balance);
    }

    receive() external payable {}
}
function disableTransferDelay() external onlyOwner returns (bool) {
        transferDelayEnabled = false;
        return true;
    }
// disable Transfer delay - cannot be reenabled