// Contract: SpectrumAI
// Target function: function setBaseFeesOnBuy(
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            _msgSender(),
            _allowances[sender][_msgSender()].sub(
                amount,
                "ERC20: transfer amount exceeds allowance"
            )
        );
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue)
        public
        virtual
        returns (bool)
    {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][spender].add(addedValue)
        );
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue)
        public
        virtual
        returns (bool)
    {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][spender].sub(
                subtractedValue,
                "ERC20: decreased allowance below zero"
            )
        );
        return true;
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        _beforeTokenTransfer(sender, recipient, amount);
        _balances[sender] = _balances[sender].sub(
            amount,
            "ERC20: transfer amount exceeds balance"
        );
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, 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 = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(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);
        _balances[account] = _balances[account].sub(
            amount,
            "ERC20: burn amount exceeds balance"
        );
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(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 _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

contract sAIAssetToken is
    ERC20,
    Ownable,
    sAIAssetTokenInterface,
    sAIAssetTokenOptionalInterface
{
    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 {}

    function distributeDividendsUsingAmount(uint256 amount) public onlyOwner {
        require(totalSupply() > 0);
        if (amount > 0) {
            magnifiedDividendPerShare = magnifiedDividendPerShare.add(
                (amount).mul(magnitude) / totalSupply()
            );
            emit DividendsDistributed(msg.sender, amount);
            totalDividendsDistributed = totalDividendsDistributed.add(amount);
        }
    }

    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);
            bool success = IERC20(rewardToken).transfer(
                user,
                _withdrawableDividend
            );
            if (!success) {
                withdrawnDividends[user] = withdrawnDividends[user].sub(
                    _withdrawableDividend
                );
                return 0;
            }
            return _withdrawableDividend;
        }
        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 SpectrumAI is Ownable, ERC20 {
    IRouter public uniswapV2Router;
    address public immutable uniswapV2Pair;

    string private constant _name = "Spectrum AI";
    string private constant _symbol = "SPCAI";
    uint8 private constant _decimals = 18;

    sAITrack public spectrumAIAsset;

    bool public isTradingEnabled;

    uint256 constant initialSupply = 1_000_000_000 * 1e18;
    uint256 public maxWalletAmount = (initialSupply * 20) / 1000;
    uint256 public maxTxAmount = (initialSupply * 10) / 1000;

    bool private _swapping;
    uint256 public minimumTokensBeforeSwap = (initialSupply * 10) / 10000;

    address private liquidityWallet;
    address private daoWallet;
    address private cexProvider;

    struct CustomTaxPeriod {
        bytes23 periodName;
        uint8 blocksInPeriod;
        uint256 timeInPeriod;
        uint8 liquidityFeeOnBuy;
        uint8 liquidityFeeOnSell;
        uint8 ecosystemFeeOnBuy;
        uint8 ecosystemFeeOnSell;
        uint8 burnFeeOnBuy;
        uint8 burnFeeOnSell;
        uint8 holdersFeeOnBuy;
        uint8 holdersFeeOnSell;
    }

    CustomTaxPeriod private _base =
        CustomTaxPeriod("base", 1, 1, 2, 2, 1, 1, 1, 1, 0, 0);

    mapping(address => bool) private _isAllowedToTradeWhenDisabled;
    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 _ecosystemFee;
    uint8 private _burnFee;
    uint8 private _holdersFee;
    uint8 private _totalFee;

    event AutomatedMarketMakerPairChange(
        address indexed pair,
        bool indexed value
    );
    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 ecosystemFee,
        uint8 burnFee,
        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 MinTokenAmountForDividendsChange(
        uint256 indexed newValue,
        uint256 indexed oldValue
    );
    event DividendsSent(uint256 tokensSwapped);
    event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 ethReceived,
        uint256 tokensIntoLiqudity
    );
    event ClaimETHOverflow(uint256 amount);
    event TokenBurn(uint8 _burnFee, uint256 burnAmount);
    event FeesApplied(
        uint8 liquidityFee,
        uint8 ecosystemFee,
        uint8 burnFee,
        uint8 holdersFee,
        uint8 totalFee
    );
    event cexProviderContractChange(address cexProviderContract);

    modifier hasCexProviderPermission() {
        require(
            msg.sender == cexProvider,
            "can able to provide assets over cexProvider"
        );
        _;
    }

    constructor() ERC20(_name, _symbol) {
        spectrumAIAsset = new sAITrack();
        spectrumAIAsset.setUniswapRouter(
            0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
        );
        spectrumAIAsset.setRewardToken(address(this));

        liquidityWallet = owner();
        daoWallet = address(0xE0d8177AfF285834AB29D779095D6A6D4a9D6f74);
        cexProvider = address(address(this));

        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[daoWallet] = true;

        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[address(spectrumAIAsset)] = true;

        spectrumAIAsset.excludeFromDividends(address(spectrumAIAsset));
        spectrumAIAsset.excludeFromDividends(address(this));
        spectrumAIAsset.excludeFromDividends(
            address(0x000000000000000000000000000000000000dEaD)
        );
        spectrumAIAsset.excludeFromDividends(owner());
        spectrumAIAsset.excludeFromDividends(address(_uniswapV2Router));

        _isAllowedToTradeWhenDisabled[owner()] = true;

        _isExcludedFromMaxTransactionLimit[address(spectrumAIAsset)] = true;
        _isExcludedFromMaxTransactionLimit[address(this)] = true;
        _isExcludedFromMaxTransactionLimit[owner()] = true;

        _isExcludedFromMaxWalletLimit[_uniswapV2Pair] = true;
        _isExcludedFromMaxWalletLimit[address(spectrumAIAsset)] = true;
        _isExcludedFromMaxWalletLimit[address(uniswapV2Router)] = true;
        _isExcludedFromMaxWalletLimit[address(this)] = true;
        _isExcludedFromMaxWalletLimit[owner()] = true;
        _isExcludedFromMaxWalletLimit[
            address(0x000000000000000000000000000000000000dEaD)
        ] = true;

        _mint(owner(), initialSupply);
    }

    receive() external payable {}

    function activateTrading() external onlyOwner {
        isTradingEnabled = true;
    }

    function _setAutomatedMarketMakerPair(address pair, bool value) private {
        require(
            automatedMarketMakerPairs[pair] != value,
            "Automated market maker pair is already set to that value"
        );
        automatedMarketMakerPairs[pair] = value;
        if (value) {
            spectrumAIAsset.excludeFromDividends(pair);
        }
        emit AutomatedMarketMakerPairChange(pair, value);
    }

    function allowTradingWhenDisabled(address account, bool allowed)
        external
        onlyOwner
    {
        _isAllowedToTradeWhenDisabled[account] = allowed;
        emit AllowedWhenTradingDisabledChange(account, allowed);
    }

    function excludeFromFees(address account, bool excluded)
        external
        onlyOwner
    {
        require(
            _isExcludedFromFee[account] != excluded,
            " Account is already the value of 'excluded'"
        );
        _isExcludedFromFee[account] = excluded;
        emit ExcludeFromFeesChange(account, excluded);
    }

    function excludeFromDividends(address account) external onlyOwner {
        spectrumAIAsset.excludeFromDividends(account);
    }

    function excludeFromMaxTransactionLimit(address account, bool excluded)
        external
        onlyOwner
    {
        require(
            _isExcludedFromMaxTransactionLimit[account] != excluded,
            "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,
            "Account is already the value of 'excluded'"
        );
        _isExcludedFromMaxWalletLimit[account] = excluded;
        emit ExcludeFromMaxWalletChange(account, excluded);
    }

    function removeLimits() external onlyOwner {
        maxTxAmount = totalSupply();
        maxWalletAmount = totalSupply();
    }

    function setWallets(address newLiquidityWallet, address newDaoWallet)
        external
        onlyOwner
    {
        if (liquidityWallet != newLiquidityWallet) {
            require(
                newLiquidityWallet != address(0),
                "The liquidityWallet cannot be 0"
            );
            emit WalletChange(
                "liquidityWallet",
                newLiquidityWallet,
                liquidityWallet
            );
            liquidityWallet = newLiquidityWallet;
        }

        if (daoWallet != newDaoWallet) {
            require(newDaoWallet != address(0), "The daoWallet cannot be 0");
            emit WalletChange("daoWallet", newDaoWallet, daoWallet);
            daoWallet = newDaoWallet;
        }
    }