// Contract: LondonGold
// Target function: function setBaseFeesOnBuy(uint8 _liquidityFeeOnBuy,uint8 _operationsFeeOnBuy,uint8 _buyBackFeeOnBuy, uint8 _holdersFeeOnBuy) external onlyOwner
 amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _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;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _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;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _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 {}
}

contract DividendPayingToken is ERC20, Ownable, DividendPayingTokenInterface,  DividendPayingTokenOptionalInterface {
    using SafeMath for uint256;
    using SafeMathUint for uint256;
    using SafeMathInt for int256;

    uint256 internal constant magnitude = 2**128;
    uint256 internal magnifiedDividendPerShare;
    uint256 public totalDividendsDistributed;
    address public rewardToken;
    IRouter public uniswapV2Router;

    mapping(address => int256) internal magnifiedDividendCorrections;
    mapping(address => uint256) internal withdrawnDividends;

    constructor(string memory _name, string memory _symbol) ERC20(_name, _symbol) {}

    receive() external payable {
        distributeDividends();
    }
    function distributeDividends() public payable override onlyOwner {
        require(totalSupply() > 0);
        if (msg.value > 0) {
            magnifiedDividendPerShare = magnifiedDividendPerShare.add(
                (msg.value).mul(magnitude) / totalSupply()
            );
            emit DividendsDistributed(msg.sender, msg.value);
            totalDividendsDistributed = totalDividendsDistributed.add(msg.value);
        }
    }
    function withdrawDividend() public virtual override onlyOwner {
        _withdrawDividendOfUser(payable(msg.sender));
    }
    function _withdrawDividendOfUser(address payable user) internal returns (uint256) {
        uint256 _withdrawableDividend = withdrawableDividendOf(user);
        if (_withdrawableDividend > 0) {
            withdrawnDividends[user] = withdrawnDividends[user].add(_withdrawableDividend);
            emit DividendWithdrawn(user, _withdrawableDividend);
            return swapETHForTokensAndWithdrawDividend(user, _withdrawableDividend);
        }
        return 0;
    }
    function swapETHForTokensAndWithdrawDividend(address holder, uint256 ethAmount)
        private
        returns (uint256)
    {
        address[] memory path = new address[](2);
        path[0] = uniswapV2Router.WETH();
        path[1] = address(rewardToken);

        try
            uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{ value: ethAmount }(
                0, // accept any amount of tokens
                path,
                address(holder),
                block.timestamp
            )
        {
            return ethAmount;
        } catch {
            withdrawnDividends[holder] = withdrawnDividends[holder].sub(ethAmount);
            return 0;
        }
    }
    function dividendOf(address _owner) public view override returns (uint256) {
        return withdrawableDividendOf(_owner);
    }
    function withdrawableDividendOf(address _owner) public view override returns (uint256) {
        return accumulativeDividendOf(_owner).sub(withdrawnDividends[_owner]);
    }
    function withdrawnDividendOf(address _owner) public view override returns (uint256) {
        return withdrawnDividends[_owner];
    }
    function accumulativeDividendOf(address _owner) public view override returns (uint256) {
        return
            magnifiedDividendPerShare
                .mul(balanceOf(_owner))
                .toInt256Safe()
                .add(magnifiedDividendCorrections[_owner])
                .toUint256Safe() / magnitude;
    }
    function _transfer(
        address from,
        address to,
        uint256 value
    ) internal virtual override {
        require(false);
        int256 _magCorrection = magnifiedDividendPerShare.mul(value).toInt256Safe();
        magnifiedDividendCorrections[from] = magnifiedDividendCorrections[from].add(_magCorrection);
        magnifiedDividendCorrections[to] = magnifiedDividendCorrections[to].sub(_magCorrection);
    }
    function _mint(address account, uint256 value) internal override {
        super._mint(account, value);
        magnifiedDividendCorrections[account] = magnifiedDividendCorrections[account].sub(
            (magnifiedDividendPerShare.mul(value)).toInt256Safe()
        );
    }
    function _burn(address account, uint256 value) internal override {
        super._burn(account, value);
        magnifiedDividendCorrections[account] = magnifiedDividendCorrections[account].add(
            (magnifiedDividendPerShare.mul(value)).toInt256Safe()
        );
    }
    function _setBalance(address account, uint256 newBalance) internal {
        uint256 currentBalance = balanceOf(account);
        if (newBalance > currentBalance) {
            uint256 mintAmount = newBalance.sub(currentBalance);
            _mint(account, mintAmount);
        } else if (newBalance < currentBalance) {
            uint256 burnAmount = currentBalance.sub(newBalance);
            _burn(account, burnAmount);
        }
    }
    function _setRewardToken(address token) internal onlyOwner {
        rewardToken = token;
    }
    function _setUniswapRouter(address router) internal onlyOwner {
        uniswapV2Router = IRouter(router);
    }
}

contract LondonGold is Ownable, ERC20 {
    using Address for address;

    IRouter public uniswapV2Router;
    address public immutable uniswapV2Pair;

    string private constant _name = "London Gold";
    string private constant _symbol = "XUA2";

    LondonGoldDividendTracker public dividendTracker;

    bool public isTradingEnabled;

    uint256 public initialSupply = 1000000000 * (10**18);

    // max tx is 0.5% of initialSupply
    uint256 public maxTxAmount = initialSupply * 50 / 10000;

    // max wallet is 2% of initialSupply
    uint256 public maxWalletAmount = initialSupply * 200 / 10000;

    bool private _swapping;
    address public dividendToken = 0x45804880De22913dAFE09f4980848ECE6EcbAf78;
    uint256 public minimumTokensBeforeSwap = initialSupply * 25 / 100000;

    address public liquidityWallet;
    address public operationsWallet;
    address public buyBackWallet;

    struct CustomTaxPeriod {
        bytes23 periodName;
        uint8 liquidityFeeOnBuy;
        uint8 liquidityFeeOnSell;
        uint8 operationsFeeOnBuy;
        uint8 operationsFeeOnSell;
        uint8 buyBackFeeOnBuy;
        uint8 buyBackFeeOnSell;
        uint8 holdersFeeOnBuy;
        uint8 holdersFeeOnSell;
    }

    // Base taxes
    CustomTaxPeriod private _base = CustomTaxPeriod("base", 1, 1, 4, 4, 4, 4, 3, 3);

    bool private _isLaunched;
    uint256 private _launchStartTimestamp;
    uint256 private _launchBlockNumber;

    mapping (address => bool) private _isBlocked;
    mapping(address => bool) private _isAllowedToTradeWhenDisabled;
    mapping(address => bool) private _feeOnSelectedWalletTransfers;
    mapping(address => bool) private _isExcludedFromFee;
    mapping(address => bool) private _isExcludedFromMaxTransactionLimit;
    mapping(address => bool) private _isExcludedFromMaxWalletLimit;
    mapping(address => bool) public automatedMarketMakerPairs;

    uint8 private _liquidityFee;
    uint8 private _operationsFee;
    uint8 private _buyBackFee;
    uint8 private _holdersFee;
    uint8 private _totalFee;

    event AutomatedMarketMakerPairChange(address indexed pair, bool indexed value);
    event BlockedAccountChange(address indexed holder, bool indexed status);
    event UniswapV2RouterChange(address indexed newAddress, address indexed oldAddress);
    event WalletChange(string indexed indentifier,address indexed newWallet,address indexed oldWallet);
    event FeeChange(string indexed identifier,uint8 liquidityFee,uint8 operationsFee,uint8 buyBackFee, uint8 holdersFee);
    event CustomTaxPeriodChange(uint256 indexed newValue,uint256 indexed oldValue,string indexed taxType,bytes23 period);
    event MaxTransactionAmountChange(uint256 indexed newValue, uint256 indexed oldValue);
    event MaxWalletAmountChange(uint256 indexed newValue, uint256 indexed oldValue);
    event ExcludeFromFeesChange(address indexed account, bool isExcluded);
    event ExcludeFromMaxTransferChange(address indexed account, bool isExcluded);
    event ExcludeFromMaxWalletChange(address indexed account, bool isExcluded);
    event AllowedWhenTradingDisabledChange(address indexed account, bool isExcluded);
    event MinTokenAmountBeforeSwapChange(uint256 indexed newValue, uint256 indexed oldValue);
    event DividendsSent(uint256 tokensSwapped);
    event FeeOnSelectedWalletTransfersChange(address indexed account, bool newValue);
    event ClaimOverflow(address token, uint256 amount);
    event TradingStatusChange(bool indexed newValue, bool indexed oldValue);
    event SwapAndLiquify(uint256 tokensSwapped, uint256 ethReceived, uint256 tokensIntoLiqudity);
    event FeesApplied(uint8 liquidityFee,uint8 operationsFee,uint8 buyBackFee, uint8 holdersFee, uint8 totalFee);

    constructor() ERC20(_name, _symbol) {
        dividendTracker = new LondonGoldDividendTracker();
        dividendTracker.setUniswapRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        dividendTracker.setRewardToken(dividendToken);

        liquidityWallet = owner();
        operationsWallet = owner();
        buyBackWallet = owner();

        IRouter _uniswapV2Router = IRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        address _uniswapV2Pair = IFactory(_uniswapV2Router.factory()).createPair(address(this),_uniswapV2Router.WETH());
        uniswapV2Router = _uniswapV2Router;
        uniswapV2Pair = _uniswapV2Pair;
        _setAutomatedMarketMakerPair(_uniswapV2Pair, true);

        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;

        _isAllowedToTradeWhenDisabled[owner()] = true;
        _isAllowedToTradeWhenDisabled[address(this)] = true;

        _isExcludedFromMaxTransactionLimit[address(this)] = true;
        _isExcludedFromMaxTransactionLimit[_uniswapV2Pair] = true;

        dividendTracker.excludeFromDividends(address(dividendTracker));
        dividendTracker.excludeFromDividends(address(this));
        dividendTracker.excludeFromDividends(address(0x000000000000000000000000000000000000dEaD));
        dividendTracker.excludeFromDividends(owner());
        dividendTracker.excludeFromDividends(address(_uniswapV2Router));

        _isExcludedFromMaxWalletLimit[_uniswapV2Pair] = true;
        _isExcludedFromMaxWalletLimit[address(uniswapV2Router)] = true;
        _isExcludedFromMaxWalletLimit[address(this)] = true;
        _isExcludedFromMaxWalletLimit[owner()] = true;

        _mint(owner(), initialSupply);
    }

    receive() external payable {}

    function activateTrading() external onlyOwner {
        isTradingEnabled = true;
        if(_launchBlockNumber == 0) {
            _launchBlockNumber = block.number;
            _launchStartTimestamp = block.timestamp;
            _isLaunched = true;
        }
        emit TradingStatusChange(true, false);
    }
    function deactivateTrading() external onlyOwner {
        isTradingEnabled = false;
        emit TradingStatusChange(false, true);
    }
    function _setAutomatedMarketMakerPair(address pair, bool value) private {
        require(automatedMarketMakerPairs[pair] != value,"LondonGold: Automated market maker pair is already set to that value");
        automatedMarketMakerPairs[pair] = value;
        if (value) {
            dividendTracker.excludeFromDividends(pair);
        }
        emit AutomatedMarketMakerPairChange(pair, value);
    }
    function allowTradingWhenDisabled(address account, bool allowed) external onlyOwner {
        _isAllowedToTradeWhenDisabled[account] = allowed;
        emit AllowedWhenTradingDisabledChange(account, allowed);
    }
    function blockAccount(address account) external onlyOwner {
        require(!_isBlocked[account], "LondonGold: Account is already blocked");
        if (_isLaunched) {
            require((block.timestamp - _launchStartTimestamp) < 172800, "LondonGold: Time to block accounts has expired");
        }
        _isBlocked[account] = true;
        emit BlockedAccountChange(account, true);
    }
    function unblockAccount(address account) external onlyOwner {
        require(_isBlocked[account], "LondonGold: Account is not blcoked");
        _isBlocked[account] = false;
        emit BlockedAccountChange(account, false);
    }
    function setFeeOnSelectedWalletTransfers(address account, bool value) external onlyOwner {
        require(_feeOnSelectedWalletTransfers[account] != value,"LondonGold: The selected wallet is already set to the value ");
        _feeOnSelectedWalletTransfers[account] = value;
        emit FeeOnSelectedWalletTransfersChange(account, value);
    }
    function excludeFromDividends(address account) external onlyOwner {
        dividendTracker.excludeFromDividends(account);
    }
    function excludeFromFees(address account, bool excluded) external onlyOwner {
        require(_isExcludedFromFee[account] != excluded,"LondonGold: Account is already the value of 'excluded'");
        _isExcludedFromFee[account] = excluded;
        emit ExcludeFromFeesChange(account, excluded);
    }
    function excludeFromMaxTransactionLimit(address account, bool excluded) external onlyOwner {
        require(_isExcludedFromMaxTransactionLimit[account] != excluded,"LondonGold: Account is already the value of 'excluded'");
        _isExcludedFromMaxTransactionLimit[account] = excluded;
        emit ExcludeFromMaxTransferChange(account, excluded);
    }
    function excludeFromMaxWalletLimit(address account, bool excluded) external onlyOwner {
        require(_isExcludedFromMaxWalletLimit[account] != excluded,"LondonGold: Account is already the value of 'excluded'");
        _isExcludedFromMaxWalletLimit[account] = excluded;
        emit ExcludeFromMaxWalletChange(account, excluded);
    }
    function setWallets(address newLiquidityWallet,address newOperationsWallet,address newBuyBackWallet) external onlyOwner {
        if (liquidityWallet != newLiquidityWallet) {
            require(newLiquidityWallet != address(0), "LondonGold: The liquidityWallet cannot be 0");
            emit WalletChange("liquidityWallet", newLiquidityWallet, liquidityWallet);
            liquidityWallet = newLiquidityWallet;
        }
        if (operationsWallet != newOperationsWallet) {
            require(newOperationsWallet != address(0), "LondonGold: The operationsWallet cannot be 0");
            emit WalletChange("operationsWallet", newOperationsWallet, operationsWallet);
            operationsWallet = newOperationsWallet;
        }
        if (buyBackWallet != newBuyBackWallet) {
            require(newBuyBackWallet != address(0), "LondonGold: The buyBackWallet cannot be 0");
            emit WalletChange("buyBackWallet", newBuyBackWallet, buyBackWallet);
            buyBackWallet = newBuyBackWallet;
        }
    }