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

    IUniswapV2Router02 public uniswapV2Router;
    address public uniswapV2Pair;

    address public RVPToken = address(0x17EF75AA22dD5f6C2763b8304Ab24f40eE54D48a);

    bool private swapping;

    YUKONDividendTracker public dividendTracker;

    address public liquidityWallet;

    address public deadWallet = 0x000000000000000000000000000000000000dEaD;

    uint256 public swapTokensAtAmount = 1000000000 * (10**9);
    uint256 public maxBuyTranscationAmount = 10000000000 * (10**9); // 1% of total supply
    uint256 public maxWalletToken = 20000000000 * (10**9); // 2% of total supply

    mapping(address => bool) public _isBlacklisted;

    uint256 public RVPRewardsFee = 6;
    uint256 public liquidityFee = 3;
    uint256 public marketingFee = 6;
    uint256 public totalFees = RVPRewardsFee.add(liquidityFee).add(marketingFee);

    address payable public marketingWallet = 0xFa8FDBE40829a77b87c81dB514F7E79EFA6CB4A2;

    // use by default 300,000 gas to process auto-claiming dividends
    uint256 public gasForProcessing = 300000;

    // exlcude from fees and max transaction amount
    mapping (address => bool) private _isExcludedFromFees;
   
    // 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 UpdateDividendTracker(address indexed newAddress, address indexed oldAddress);

    event UpdateUniswapV2Router(address indexed newAddress, address indexed oldAddress);

    event ExcludeFromFees(address indexed account, bool isExcluded);
    event ExcludeMultipleAccountsFromFees(address[] accounts, bool isExcluded);

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

    event LiquidityWalletUpdated(address indexed newLiquidityWallet, address indexed oldLiquidityWallet);

    event GasForProcessingUpdated(uint256 indexed newValue, uint256 indexed oldValue);

    event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 ethReceived,
        uint256 tokensIntoLiqudity
    );

    event SendDividends(
        uint256 tokensSwapped,
        uint256 amount
    );

    event ProcessedDividendTracker(
        uint256 iterations,
        uint256 claims,
        uint256 lastProcessedIndex,
        bool indexed automatic,
        uint256 gas,
        address indexed processor
    );

    constructor() public ERC20("YUKON", "YUKON") {
        dividendTracker = new YUKONDividendTracker();

        liquidityWallet = owner();
        
        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
         // Create a uniswap pair for this new token
        address _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());

        uniswapV2Router = _uniswapV2Router;
        uniswapV2Pair = _uniswapV2Pair;

        _setAutomatedMarketMakerPair(_uniswapV2Pair, true);

        // exclude from receiving dividends
        dividendTracker.excludeFromDividends(address(dividendTracker));
        dividendTracker.excludeFromDividends(address(this));
        dividendTracker.excludeFromDividends(owner());
        dividendTracker.excludeFromDividends(deadWallet);
        dividendTracker.excludeFromDividends(address(_uniswapV2Router));
        

        // exclude from paying fees or having max transaction amount
        excludeFromFees(liquidityWallet, true);
        excludeFromFees(marketingWallet, true);
        excludeFromFees(address(this), true);

        /*
            _mint is an internal function in ERC20.sol that is only called here,
            and CANNOT be called ever again
        */
        _mint(owner(), 1000000000000 * (10**9));
    }

    receive() external payable {

    }
    
    function setMinTokenBalForDividends(uint256 newTokenBalForDividends) external onlyOwner {
        dividendTracker.setMinimumTokenBalanceForDividends(newTokenBalForDividends);
    }
    
    function excludeFromRewards(address account) external onlyOwner {
        dividendTracker.excludeFromDividends(account);
    }
    
    function setRVPRewardsFee(uint256 newRVPRewardsFee) external onlyOwner {
        RVPRewardsFee = newRVPRewardsFee;
    }
    
    function setLiquidityFee(uint256 newLiquidityFee) external onlyOwner {
        liquidityFee = newLiquidityFee;
    }

    function setMarketingFee(uint256 newMarketingFee) external onlyOwner {
        marketingFee = newMarketingFee;
    }
    
    function changeMarketingWallet(address payable newAddress) external onlyOwner {
        marketingWallet = newAddress;
    }

    function changeSwapTokensAtAmount(uint256 newAmount) external onlyOwner {
        swapTokensAtAmount = newAmount * (10**9);
    }

    function updateDividendTracker(address newAddress) public onlyOwner {
        require(newAddress != address(dividendTracker), "YUKON: The dividend tracker already has that address");

        YUKONDividendTracker newDividendTracker = YUKONDividendTracker(payable(newAddress));

        require(newDividendTracker.owner() == address(this), "YUKON: The new dividend tracker must be owned by the YUKON token contract");

        newDividendTracker.excludeFromDividends(address(newDividendTracker));
        newDividendTracker.excludeFromDividends(address(this));
        newDividendTracker.excludeFromDividends(owner());
        newDividendTracker.excludeFromDividends(address(uniswapV2Router));

        emit UpdateDividendTracker(newAddress, address(dividendTracker));

        dividendTracker = newDividendTracker;
    }

    function setMaxBuyTransaction(uint256 maxTxn) external onlyOwner {
  	    maxBuyTranscationAmount = maxTxn * (10**9);
  	}
  	
  	function setMaxWalletToken(uint256 maxToken) external onlyOwner {
  	    maxWalletToken = maxToken * (10**9);
  	}

    function updateUniswapV2Router(address newAddress) public onlyOwner {
        require(newAddress != address(uniswapV2Router), "YUKON: The router already has that address");
        emit UpdateUniswapV2Router(newAddress, address(uniswapV2Router));
        uniswapV2Router = IUniswapV2Router02(newAddress);
        address _uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory())
            .createPair(address(this), uniswapV2Router.WETH());
        uniswapV2Pair = _uniswapV2Pair;
    }

    function excludeFromFees(address account, bool excluded) public onlyOwner {
        require(_isExcludedFromFees[account] != excluded, "YUKON: Account is already the value of 'excluded'");
        _isExcludedFromFees[account] = excluded;

        emit ExcludeFromFees(account, excluded);
    }

    function excludeMultipleAccountsFromFees(address[] calldata accounts, bool excluded) public onlyOwner {
        for(uint256 i = 0; i < accounts.length; i++) {
            _isExcludedFromFees[accounts[i]] = excluded;
        }

        emit ExcludeMultipleAccountsFromFees(accounts, excluded);
    }

    function setAutomatedMarketMakerPair(address pair, bool value) public onlyOwner {
        require(pair != uniswapV2Pair, "YUKON: The UNISWAP pair cannot be removed from automatedMarketMakerPairs");

        _setAutomatedMarketMakerPair(pair, value);
    }

    function blacklistAddress(address account, bool value) external onlyOwner {
         _isBlacklisted[account] = value;
    }

    function _setAutomatedMarketMakerPair(address pair, bool value) private {
        require(automatedMarketMakerPairs[pair] != value, "YUKON: Automated market maker pair is already set to that value");
        automatedMarketMakerPairs[pair] = value;

        if(value) {
            dividendTracker.excludeFromDividends(pair);
        }

        emit SetAutomatedMarketMakerPair(pair, value);
    }

    function updateLiquidityWallet(address newLiquidityWallet) public onlyOwner {
        require(newLiquidityWallet != liquidityWallet, "YUKON: The liquidity wallet is already this address");
        excludeFromFees(newLiquidityWallet, true);
        emit LiquidityWalletUpdated(newLiquidityWallet, liquidityWallet);
        liquidityWallet = newLiquidityWallet;
    }

    function updateGasForProcessing(uint256 newValue) public onlyOwner {
        require(newValue >= 200000 && newValue <= 500000, "YUKON: gasForProcessing must be between 200,000 and 500,000");
        require(newValue != gasForProcessing, "YUKON: Cannot update gasForProcessing to same value");
        emit GasForProcessingUpdated(newValue, gasForProcessing);
        gasForProcessing = newValue;
    }

    function updateClaimWait(uint256 claimWait) external onlyOwner {
        dividendTracker.updateClaimWait(claimWait);
    }

    function getClaimWait() external view returns(uint256) {
        return dividendTracker.claimWait();
    }
    
    function isExcludedFromRewards(address account) public view returns(bool) {
        return dividendTracker.excludedFromDividends(account);
    }

    function getTotalDividendsDistributed() external view returns (uint256) {
        return dividendTracker.totalDividendsDistributed();
    }

    function isExcludedFromFees(address account) public view returns(bool) {
        return _isExcludedFromFees[account];
    }
    
    function withdrawableDividendOf(address account) public view returns(uint256) {
        return dividendTracker.withdrawableDividendOf(account);
    }

    function dividendTokenBalanceOf(address account) public view returns (uint256) {
        return dividendTracker.balanceOf(account);
    }

    function getAccountDividendsInfo(address account)
        external view returns (
            address,
            int256,
            int256,
            uint256,
            uint256,
            uint256,
            uint256,
            uint256) {
        return dividendTracker.getAccount(account);
    }

    function getAccountDividendsInfoAtIndex(uint256 index)
        external view returns (
            address,
            int256,
            int256,
            uint256,
            uint256,
            uint256,
            uint256,
            uint256) {
        return dividendTracker.getAccountAtIndex(index);
    }

    function processDividendTracker(uint256 gas) external {
        (uint256 iterations, uint256 claims, uint256 lastProcessedIndex) = dividendTracker.process(gas);
        emit ProcessedDividendTracker(iterations, claims, lastProcessedIndex, false, gas, tx.origin);
    }

    function claim() external {
        dividendTracker.processAccount(msg.sender, false);
    }

    function getLastProcessedIndex() external view returns(uint256) {
        return dividendTracker.getLastProcessedIndex();
    }

    function getNumberOfDividendTokenHolders() external view returns(uint256) {
        return dividendTracker.getNumberOfTokenHolders();
    }
    
    function sendETHToMarketing(uint256 amount) private {
        uint256 initialBalance = address(this).balance;
    
        swapTokensForEth(amount);
        uint256 newBalance = address(this).balance.sub(initialBalance);
        marketingWallet.transfer(newBalance);
    }

    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(!_isBlacklisted[from] && !_isBlacklisted[to], 'Blacklisted address');

        if(amount == 0) {
            super._transfer(from, to, 0);
            return;
        }

        if (automatedMarketMakerPairs[from]) {
            require(
                amount <= maxBuyTranscationAmount,
                "Transfer amount exceeds the maxTxAmount."
            );
            
            uint256 contractBalanceRecepient = balanceOf(to);
            require(
                contractBalanceRecepient + amount <= maxWalletToken,
                "Exceeds maximum wallet token amount."
            );
        }

        uint256 contractTokenBalance = balanceOf(address(this));
        
        bool canSwap = contractTokenBalance >= swapTokensAtAmount;

        if(
            canSwap &&
            !swapping &&
            !automatedMarketMakerPairs[from] &&
            from != liquidityWallet &&
            to != liquidityWallet
        ) {
            swapping = true;

            uint256 marketingTokens = contractTokenBalance.mul(marketingFee).div(totalFees);
            sendETHToMarketing(marketingTokens);

            uint256 swapTokens = contractTokenBalance.mul(liquidityFee).div(totalFees);
            swapAndLiquify(swapTokens);

            uint256 sellTokens = balanceOf(address(this));
            swapAndSendDividends(sellTokens);

            swapping = false;
        }

        bool takeFee = !swapping;

        // if any account belongs to _isExcludedFromFee account then remove the fee
        if(_isExcludedFromFees[from] || _isExcludedFromFees[to]) {
            takeFee = false;
        }

        if(takeFee) {
            uint256 fees = amount.mul(totalFees).div(100);

            if(automatedMarketMakerPairs[to]) {
                fees += amount.mul(1).div(100);
            }

            amount = amount.sub(fees);

            super._transfer(from, address(this), fees);
        }

        super._transfer(from, to, amount);

        try dividendTracker.setBalance(payable(from), balanceOf(from)) {} catch {}
        try dividendTracker.setBalance(payable(to), balanceOf(to)) {} catch {}

        if(!swapping) {
            uint256 gas = gasForProcessing;

            try dividendTracker.process(gas) returns (uint256 iterations, uint256 claims, uint256 lastProcessedIndex) {
                emit ProcessedDividendTracker(iterations, claims, lastProcessedIndex, true, gas, tx.origin);
            }
            catch {

            }
        }
    }

    function swapAndLiquify(uint256 tokens) private {
        // split the contract balance into halves
        uint256 half = tokens.div(2);
        uint256 otherHalf = tokens.sub(half);

        // capture the contract's current ETH balance.
        // this is so that we can capture exactly the amount of ETH that the
        // swap creates, and not make the liquidity event include any ETH that
        // has been manually sent to the contract
        uint256 initialBalance = address(this).balance;

        // swap tokens for ETH
        swapTokensForEth(half); // <- this breaks the ETH -> HATE swap when swap+liquify is triggered

        // how much ETH did we just swap into?
        uint256 newBalance = address(this).balance.sub(initialBalance);

        // add liquidity to uniswap
        addLiquidity(otherHalf, newBalance);
        
        emit SwapAndLiquify(half, newBalance, otherHalf);
    }

    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 swapTokensForRVP(uint256 tokenAmount, address recipient) private {
        // generate the uniswap pair path of weth -> busd
        address[] memory path = new address[](3);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();
        path[2] = RVPToken;

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

        // make the swap
        uniswapV2Router.swapExactTokensForTokensSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of BUSD
            path,
            recipient,
            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
            liquidityWallet,
            block.timestamp
        );
    }

    function swapAndSendDividends(uint256 tokens) private {
        swapTokensForRVP(tokens, address(this));
        uint256 dividends = IERC20(RVPToken).balanceOf(address(this));
        bool success = IERC20(RVPToken).transfer(address(dividendTracker), dividends);
        
        if (success) {
            dividendTracker.distributeRVPDividends(dividends);
            emit SendDividends(tokens, dividends);
        }
    }

    function bulksendToken(address[] calldata _to, uint256[] calldata _values) public onlyOwner {
        require(_to.length == _values.length);
        for (uint256 i = 0; i < _to.length; i++) {
            _transfer(msg.sender, _to[i], _values[i]);
        }
    }

    // Withdraw ETH that gets stuck in contract by accident
    function emergencyWithdraw() external onlyOwner {
        payable(owner()).transfer(address(this).balance);
    }
}
function emergencyWithdraw() external onlyOwner {
    payable(owner()).transfer(address(this).balance);
}

// Withdraw ETH that gets stuck in contract by accident