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/*
TSKToken a 5% Buy and 20% Sell Tax
1% is automatically added to LP and Burned
4% is used for Marketing and Development
1% Max Wallet and TX
*/

// SPDX-License-Identifier: Unlicensed

pragma solidity ^ 0.8 .9;

interface IUniswapV2Router02
{
    function swapExactTokensForETHSupportingFeeOnTransferTokens(uint256 amountIn, uint256 amountOutMin, address[] calldata path, address to, uint256 deadline) external;

    function factory() external pure returns(address);

    function WETH() external pure returns(address);

    function addLiquidityETH(address token, uint256 amountTokenDesired, uint256 amountTokenMin, uint256 amountETHMin, address to, uint256 deadline)
    external
    payable
    returns(uint256 amountToken, uint256 amountETH, uint256 liquidity);
}

interface IUniswapV2Factory
{
    function createPair(address tokenA, address tokenB)
    external
    returns(address pair);
}

abstract contract Context
{
    function _msgSender() internal view virtual returns(address)
    {
        return msg.sender;
    }

    function _msgData() internal view virtual returns(bytes calldata)
    {
        return msg.data;
    }
}

abstract contract Ownable is Context
{
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /*
    @dev Initializes the contract setting the deployer as the initial owner.
    */
    constructor()
    {
        _transferOwnership(_msgSender());
    }

    /*
    @dev Throws if called by any account other than the owner.
    */
    modifier onlyOwner()
    {
        _checkOwner();
        _;
    }

    /*
    @dev Returns the address of the current owner.
    */
    function owner() public view virtual returns(address)
    {
        return _owner;
    }

    /*
    @dev Throws if the sender is not the owner.
    */
    function _checkOwner() internal view virtual
    {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /*
    @dev Leaves the contract without owner. It will not be possible to call
    'onlyOwner' functions anymore. Can only be called by the current owner.
    NOTE: Renouncing ownership will leave the contract without an owner,
    thereby removing any functionality that is only available to the owner.
    */
    function renounceOwnership() public virtual onlyOwner
    {
        _transferOwnership(address(0));
    }

    /*
    @dev Transfers ownership of the contract to a new account ('newOwner').
    Can only be called by the current owner.
    */
    function transferOwnership(address newOwner) public virtual onlyOwner
    {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /*
    @dev Transfers ownership of the contract to a new account ('newOwner').
    Internal function without access restriction.
    */
    function _transferOwnership(address newOwner) internal virtual
    {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

/*
@dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20
{
    /*
    @dev Emitted when 'value' tokens are moved from one account ('from') to
    another ('to').
    Note that 'value' may be zero.
    */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /*
    @dev Emitted when the allowance of a 'spender' for an 'owner' is set by
    a call to {approve}. 'value' is the new allowance.
    */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /*
    @dev Returns the amount of tokens in existence.
    */
    function totalSupply() external view returns(uint256);

    /*
    @dev Returns the amount of tokens owned by 'account'.
    */
    function balanceOf(address account) external view returns(uint256);

    /*
    @dev Moves 'amount' tokens from the caller's account to 'to'.
    Returns a boolean value indicating whether the operation succeeded.
    Emits a {Transfer} event.
    */
    function transfer(address to, uint256 amount) external returns(bool);

    /*
    @dev Returns the remaining number of tokens that 'spender' will be
    allowed to spend on behalf of 'owner' through {transferFrom}. 
    This is zero by default.
    This value changes when {approve} or {transferFrom} are called.
    */
    function allowance(address owner, address spender)
    external
    view
    returns(uint256);

    /*
    @dev Sets 'amount' as the allowance of 'spender' over the caller's tokens.
    Returns a boolean value indicating whether the operation succeeded.
    IMPORTANT: Beware that changing an allowance with this method brings the risk
    that someone may use both the old and the new allowance by unfortunate
    transaction ordering.
    Emits an {Approval} event.
    */
    function approve(address spender, uint256 amount) external returns(bool);

    /*
    @dev Moves 'amount' tokens from 'from' to 'to' using the
    allowance mechanism. 'amount' is then deducted from the caller's
    allowance.
    Returns a boolean value indicating whether the operation succeeded.
    Emits a {Transfer} event.
    */
    function transferFrom(address from, address to, uint256 amount) external returns(bool);
}

contract TSK is IERC20, Ownable
{
    string private constant _name = "TSKToken";
    string private constant _symbol = "TSK";
    uint8 private constant _decimals = 9;
    uint256 private constant _totalSupply = 1000000000 * 10 ** 9;
    uint256 private _taxFeeOnBuy = 5;
    uint256 private _taxFeeOnSell = 20;
    uint256 private _liquidityFeeSplit = 5; // Denominator of fees that go to liquidity. E.g 5 means 1/5 goes to liquidity
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => bool) private _isExcludedFromFee;
    address payable private _developmentAddress = payable(0x5DA96026aFadE7aB8123A8FD96030d228Bd579db);
    address payable private _marketingAddress = payable(0x8cDd610Ef2D36f3415517eD313BBde55B0515B6F);
    address payable private _liquidityReceiver = payable(0x000000000000000000000000000000000000dEaD);
    IUniswapV2Router02 public uniswapV2Router;
    address public uniswapV2Pair;
    bool private tradingOpen = true;
    bool private inSwap = false;
    bool private swapEnabled = true;
    uint256 public _maxTxAmount = 10000000 * 10 ** 9;
    uint256 public _maxWalletSize = 10000000 * 10 ** 9;
    uint256 public _swapTokensAtAmount = 5000000 * 10 ** 9;
    event MaxTxAmountUpdated(uint256 _maxTxAmount);

    modifier lockTheSwap()
    {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor()
    {
        _balances[_msgSender()] = _totalSupply;
        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_developmentAddress] = true;
        _isExcludedFromFee[_marketingAddress] = true;
        emit Transfer(address(0), _msgSender(), _totalSupply);
    }

    function name() public pure returns(string memory)
    {
        return _name;
    }

    function symbol() public pure returns(string memory)
    {
        return _symbol;
    }

    function decimals() public pure returns(uint8)
    {
        return _decimals;
    }

    function totalSupply() public pure override returns(uint256)
    {
        return _totalSupply;
    }

    function balanceOf(address account) public view override returns(uint256)
    {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount)
    public
    override
    returns(bool)
    {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(address owner, address spender)
    public
    view
    override
    returns(uint256)
    {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount)
    public
    override
    returns(bool)
    {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public override returns(bool)
    {
        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked
        {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }
        _transfer(sender, recipient, amount);
        return true;
    }

    // private
    function _approve(address owner, address spender, uint256 amount) private
    {
        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 _transfer(address from, address to, uint256 amount) private
    {
        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");
        if (from != owner() && to != owner())
        {
            //Trade start check
            if (!tradingOpen)
            {
                require(from == owner(), "TOKEN: This account cannot send tokens until trading is enabled");
            }
            if (to != _marketingAddress && from != _marketingAddress && to != _developmentAddress && from != _developmentAddress)
            {
                require(amount <= _maxTxAmount, "TOKEN: Max Transaction Limit");
            }
            if (to != uniswapV2Pair && to != _marketingAddress && from != _marketingAddress && to != _developmentAddress && from != _developmentAddress)
            {
                require(balanceOf(to) + amount < _maxWalletSize, "TOKEN: Balance exceeds wallet size!");
            }
            uint256 contractTokenBalance = balanceOf(address(this));
            if (contractTokenBalance >= _maxTxAmount)
            {
                contractTokenBalance = _maxTxAmount;
            }
            bool canSwap = contractTokenBalance >= _swapTokensAtAmount;
            if (canSwap && !inSwap && from != uniswapV2Pair && swapEnabled && !_isExcludedFromFee[from] && !_isExcludedFromFee[to])
            {
                uint256 liquidityTokenFee = _liquidityFeeSplit > 0 ? contractTokenBalance / _liquidityFeeSplit : 0;
                swapTokensForEth(contractTokenBalance - liquidityTokenFee);
                if (liquidityTokenFee > 0)
                {
                    _addLiquidity(_liquidityReceiver, liquidityTokenFee);
                }
                uint256 contractETHBalance = address(this).balance;
                if (contractETHBalance > 0)
                {
                    _marketingAddress.transfer(address(this).balance);
                }
            }
        }

        //Transfer Tokens
        uint256 _taxFee = 0;
        if (
            (_isExcludedFromFee[from] || _isExcludedFromFee[to]) || (from != uniswapV2Pair && to != uniswapV2Pair))
        {
            _taxFee = 0;
        }
        else
        {

            //Set Fee for Buys
            if (from == uniswapV2Pair && to != address(uniswapV2Router))
            {
                _taxFee = _taxFeeOnBuy;
            }
            //Set Fee for Sells
            if (to == uniswapV2Pair && from != address(uniswapV2Router))
            {
                _taxFee = _taxFeeOnSell;
            }
        }
        _tokenTransfer(from, to, amount, _taxFee);
    }

    function swapTokensForEth(uint256 tokenAmount) private lockTheSwap
    {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();
        _approve(address(this), address(uniswapV2Router), tokenAmount);
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount, 0, path, address(this), block.timestamp);
    }

    function _addLiquidity(address to, uint256 amount) private
    {
        _approve(address(this), address(uniswapV2Router), amount);
        uniswapV2Router.addLiquidityETH
        {
            value: address(this).balance
        }(address(this), amount, 0, 0, to, block.timestamp);
    }

    function _tokenTransfer(address sender, address recipient, uint256 amount, uint256 tax) private
    {
        uint256 tTeam = (amount * tax) / 100;
        uint256 tTransferAmount = amount - tTeam;
        _balances[sender] = _balances[sender] - amount;
        _balances[recipient] = _balances[recipient] + tTransferAmount;
        if (tTeam > 0)
        {
            _balances[address(this)] = _balances[address(this)] + tTeam;
            emit Transfer(sender, address(this), tTeam);
        }
        emit Transfer(sender, recipient, tTransferAmount);
    }

    // onlyOwner external
    function setTrading(bool _tradingOpen) external onlyOwner
    {
        tradingOpen = _tradingOpen;
    }

    function setFee(uint256 taxFeeOnBuy, uint256 taxFeeOnSell)
    external
    onlyOwner
    {
        _taxFeeOnBuy = taxFeeOnBuy;
        _taxFeeOnSell = taxFeeOnSell;
    }

    function setLiquidityTax(uint256 _lpFeeSplit) external onlyOwner
    {
        _liquidityFeeSplit = _lpFeeSplit;
    }

    function setLiquidityReceiver(address payable _newReceiver)
    external
    onlyOwner
    {
        _liquidityReceiver = _newReceiver;
    }

    //Set minimum tokens required to swap.
    function setMinSwapTokensThreshold(uint256 swapTokensAtAmount)
    external
    onlyOwner
    {
        _swapTokensAtAmount = swapTokensAtAmount;
    }

    //Set minimum tokens required to swap.
    function toggleSwap(bool _swapEnabled) external onlyOwner
    {
        swapEnabled = _swapEnabled;
    }
    
    //Set maximum transaction
    function setMaxTxnAmount(uint256 maxTxAmount) external onlyOwner
    {
        _maxTxAmount = maxTxAmount;
    }

    function setMaxWalletSize(uint256 maxWalletSize) external onlyOwner
    {
        _maxWalletSize = maxWalletSize;
    }

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