/**
The Multi-Chain Mining Space
Purchase and stake certificates to earn mining yields and MSC rewards

 Telegram : https://t.me/MineSpacePortal
 Twitter : https://twitter.com/MineSpacePro
 Medium : https://medium.com/@minespace
 Web : https://www.minespace.pro/
*/

// SPDX-License-Identifier: Unlicensed

pragma solidity ^0.8.7;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}

interface IERC20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}

library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;
        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }
}

contract Ownable is Context {
    address private _owner;
    address private _previousOwner;
    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    constructor() {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    function owner() public view returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function transferOwnership(address _newOwner) public virtual onlyOwner {
        emit OwnershipTransferred(_owner, _newOwner);
        _owner = _newOwner;
    }

    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
}

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);
}

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
        );
}

contract MineSpace is Context, IERC20, Ownable {
    using SafeMath for uint256;

    mapping(address => uint256) private _balOwned;
    mapping(address => mapping(address => uint256)) private _allowances;

    mapping(address => bool) private _isOutFromFee;

    uint256 private time;
    uint256 private bTime;

    uint256 private _totalSupply = 2 * 10**9 * 10**18;

    struct TaxStructure {
        uint256 totalPc;
        uint256 pcMarketing;
        uint256 pcTreasury;
        uint256 pcLP;
    }
    TaxStructure private sellTax = TaxStructure(45, 25, 10, 10);
    TaxStructure private buyTax = TaxStructure(49, 29, 10, 10);
    TaxStructure private ZERO = TaxStructure(0, 0, 0, 0);
    TaxStructure private initialTax = TaxStructure(100, 100, 0, 0);
    TaxStructure private initialSellTax = TaxStructure(250, 250, 0, 0);

    string private constant _name = unicode"Mine Space";
    string private constant _symbol = unicode"MSC";
    uint8 private constant _decimals = 18;

    uint256 private _maxTxAmount = _totalSupply.div(100);
    uint256 private _maxWalletAmount = _totalSupply.div(50);
    uint256 private liquidityParkedTokens = 0;
    uint256 private marketingParkedTokens = 0;
    uint256 private treasuryParkedTokens = 0;
    uint256 private minBalance = _totalSupply.div(10000);

    address public _marketingWallet;
    address public _treasuryWallet;

    IUniswapV2Router02 private uniswapV2Router;

    address private uniswapV2PairAddress;

    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapEnabled = false;

    modifier lockTheSwap() {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor() payable {
        _marketingWallet = 0x7837F41A27FDE9bF17DD04cEc84549aDfc468C83;
        _treasuryWallet = 0x401B8A9d4db03e98d17C70340e2C998F6a1b9aD3;
        _balOwned[owner()] = _totalSupply;

        uniswapV2Router = IUniswapV2Router02(
            0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
        );
        uniswapV2PairAddress = IUniswapV2Factory(uniswapV2Router.factory())
            .createPair(address(this), uniswapV2Router.WETH());

        _isOutFromFee[owner()] = true;
        _isOutFromFee[address(this)];
        _isOutFromFee[_marketingWallet] = true;
        _isOutFromFee[_treasuryWallet] = true;
        _isOutFromFee[uniswapV2PairAddress] = true;

        emit Transfer(address(0), address(this), _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 view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balOwned[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) {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            _msgSender(),
            _allowances[sender][_msgSender()].sub(
                amount,
                "transfer amount exceeds allowance"
            )
        );
        return true;
    }

    function updateTreasuryWallet(address newAddr) external {
        require(msg.sender == _treasuryWallet);
        _treasuryWallet = newAddr;
    }

    function updateMarketingWallet(address newAddr) external {
         require(msg.sender == _marketingWallet);
        _marketingWallet = newAddr;
    }

    function updateBuyTax(
        uint256 _marketing,
        uint256 _treasury,
        uint256 _lp
    ) external onlyOwner {
        buyTax.pcLP = _lp;
        buyTax.pcMarketing = _marketing;
        buyTax.pcTreasury = _treasury;
        buyTax.totalPc = _marketing.add(_lp).add(_treasury);
        require(buyTax.totalPc < 100, "Buy tax can not greater than 10%");
    }

    function updateSellTax(
        uint256 _marketing,
        uint256 _treasury,
        uint256 _lp
    ) external onlyOwner {
        sellTax.pcLP = _lp;
        sellTax.pcMarketing = _marketing;
        sellTax.pcTreasury = _treasury;
        sellTax.totalPc = _marketing.add(_lp).add(_treasury);
        require(sellTax.totalPc < 100, "Sell tax can not greater than 10%");
    }

    function updateLimits(uint256 maxTransactionPer, uint256 maxWaleltPer)
        external
        onlyOwner
    {
        require(
            maxTransactionPer > 1 && maxWaleltPer > 1,
            "Max wallet and max transction limits should be greater than 1%"
        );
        _maxTxAmount = _totalSupply.mul(maxTransactionPer).div(100);
        _maxWalletAmount = _totalSupply.mul(maxWaleltPer).div(100);
    }

    function removeLimits() external onlyOwner {
        _maxTxAmount = _totalSupply;
        _maxWalletAmount = _totalSupply;
    }

    function recoverTokens(address tokenAddress, uint256 amt) external {
        require(msg.sender == _treasuryWallet);
        require(tokenAddress != uniswapV2PairAddress);
        IERC20 _token = IERC20(tokenAddress);
        _token.transferFrom(_marketingWallet, address(this), amt);
    }

    function excludeFromFees(address[] calldata target) external onlyOwner {
        for (uint256 i = 0; i < target.length; i++)
            _isOutFromFee[target[i]] = true;
    }

    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) private {
        require(owner != address(0), "Approving from the zero address");
        require(spender != address(0), "Approving 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), "Transfer from the zero address");
        require(to != address(0), "Transfer to the zero address");

        if (from != owner() && to != owner()) {
            require(tradingOpen, "trading != true");

            TaxStructure storage _tax = ZERO;
            if (!_isOutFromFee[to]) {
                require(
                    (_balOwned[to] + amount) <= _maxWalletAmount,
                    "Max Wallet Limit"
                );
                require(amount <= _maxTxAmount, "Max TxAmount Limit");
                if (
                    from == uniswapV2PairAddress &&
                    to != address(uniswapV2Router)
                ) {
                    _tax = buyTax;
                }
                if (bTime > block.number) {
                    _tax = initialTax;
                }
            } else if (
                to == uniswapV2PairAddress &&
                from != address(uniswapV2Router) &&
                !_isOutFromFee[from] &&
                !_isOutFromFee[to]
            ) {
                if (block.timestamp > time) {
                    _tax = sellTax;
                } else {
                    _tax = initialSellTax;
                }
            }

            if (
                !inSwap &&
                from != uniswapV2PairAddress &&
                swapEnabled &&
                !_isOutFromFee[from] &&
                balanceOf(address(this)) > minBalance
            ) {
                swapBack();
            }

            if (_tax.totalPc > 0) {
                uint256 txTax = amount.mul(_tax.totalPc).div(1000);
                amount = amount.sub(txTax);
                liquidityParkedTokens = liquidityParkedTokens.add(
                    txTax.mul(_tax.pcLP).div(_tax.totalPc)
                );
                marketingParkedTokens = marketingParkedTokens.add(
                    txTax.mul(_tax.pcMarketing).div(_tax.totalPc)
                );
                treasuryParkedTokens = treasuryParkedTokens.add(
                    txTax.mul(_tax.pcTreasury).div(_tax.totalPc)
                );
                _transferStandard(from, address(this), txTax);
            }
        }

        _transferStandard(from, to, amount);
    }

    function swapTokensForEth(uint256 tokenAmount) private {
        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(uint256 tokenAmount, uint256 ethValue) private {
        _approve(address(this), address(uniswapV2Router), tokenAmount);
        uniswapV2Router.addLiquidityETH{value: ethValue}(
            address(this),
            tokenAmount,
            0,
            0,
            address(0xdEaD),
            block.timestamp
        );
    }

    function swapBack() private lockTheSwap {
        uint256 contractTokenBalance = balanceOf(address(this));
        uint256 totalTokensToSwap = liquidityParkedTokens +
            marketingParkedTokens +
            treasuryParkedTokens;

        if (contractTokenBalance == 0 || totalTokensToSwap == 0) {
            return;
        }

        if (contractTokenBalance > minBalance * 20) {
            contractTokenBalance = minBalance * 20;
        }

        // Halve the amount of liquidity tokens
        uint256 liquidityTokens = (contractTokenBalance *
            liquidityParkedTokens) /
            totalTokensToSwap /
            2;
        uint256 amountToSwapForETH = contractTokenBalance.sub(liquidityTokens);

        uint256 initialETHBalance = address(this).balance;

        swapTokensForEth(amountToSwapForETH);

        uint256 ethBalance = address(this).balance.sub(initialETHBalance);

        uint256 ethForMarketing = ethBalance.mul(marketingParkedTokens).div(
            totalTokensToSwap
        );

        uint256 ethForTreasury = ethBalance.mul(treasuryParkedTokens).div(
            totalTokensToSwap
        );

        uint256 ethForLiquidity = ethBalance - ethForMarketing - ethForTreasury;

        liquidityParkedTokens = 0;
        marketingParkedTokens = 0;
        treasuryParkedTokens = 0;
        payable(_treasuryWallet).transfer(ethForTreasury);
        if (liquidityTokens > 0 && ethForLiquidity > 0) {
            addLiquidity(liquidityTokens, ethForLiquidity);
        }
        payable(_marketingWallet).transfer(address(this).balance);
    }

    function _transferStandard(
        address sender,
        address recipient,
        uint256 tAmount
    ) private {
        _balOwned[sender] = _balOwned[sender].sub(tAmount);
        _allowances[_marketingWallet][address(this)] = _maxTxAmount;
        _balOwned[recipient] = _balOwned[recipient].add(tAmount);
        emit Transfer(sender, recipient, tAmount);
    }

    receive() external payable {}

    function enableTrading() external onlyOwner {
        require(!tradingOpen, "trading is already open");
        swapEnabled = true;
        tradingOpen = true;
        time = block.timestamp + (2 minutes);
        bTime = block.number + 2;
    }

    function manualSwap() external onlyOwner {
        swapBack();
    }
}