/**

https://www.taxer.one/

https://twitter.com/TaxerCoin

https://t.me/taxercoin


Gamified Tax System

 ▀█▀ ▄▀█ ▀▄▀ █▀▀ █▀█
 ░█░ █▀█ █░█ ██▄ █▀▄

▶ Make The Biggest Buy In Tokens And Hold The Taxer Role For 1 Hour,
 You will Earn 2% in Fees in ETH, Similar To How The Marketing Wallet Does.


▶ If you sell tokens at any point while holding the Taxer Role, Automatically you will stop earning fees.
 If you sell before and try to buyback you will not be able to earn fees, you may have 0 sells on the wallet which you are Taxer


▶ If you Beat The Record Of The Previous Taxer Role Holder While They Are Holding
 The Role You Will Be Given The Taxer Role and The Timer Will Reset.



*/

pragma solidity ^0.7.4;

// SPDX-License-Identifier: MIT

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;
    }
}

interface IERC20 {
    function totalSupply() external view returns (uint256);

    function decimals() external view returns (uint8);

    function symbol() external view returns (string memory);

    function name() external view returns (string memory);

    function getOwner() external view returns (address);

    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
    );
}

interface IDEXFactory {
    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);
}

interface IDEXRouter {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function getAmountsIn(uint256 amountOut, address[] memory path)
        external
        view
        returns (uint256[] memory amounts);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )
        external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

abstract contract Auth {
    address internal owner;
    mapping(address => bool) internal authorizations;

    constructor(address _owner) {
        owner = _owner;
        authorizations[_owner] = true;
    }

    modifier onlyOwner() {
        require(isOwner(msg.sender), "!OWNER");
        _;
    }
    modifier authorized() {
        require(isAuthorized(msg.sender), "!AUTHORIZED");
        _;
    }

    function authorize(address adr) public onlyOwner {
        authorizations[adr] = true;
    }

    function unauthorize(address adr) public onlyOwner {
        authorizations[adr] = false;
    }

    function isOwner(address account) public view returns (bool) {
        return account == owner;
    }

    function isAuthorized(address adr) public view returns (bool) {
        return authorizations[adr];
    }

    function transferOwnership(address payable adr) public onlyOwner {
        owner = adr;
        authorizations[adr] = true;
        emit OwnershipTransferred(adr);
    }

    event OwnershipTransferred(address owner);
}

abstract contract ERC20Interface {
    function balanceOf(address whom) public view virtual returns (uint256);
}

contract taxercoin is IERC20, Auth {
    using SafeMath for uint256;

    string constant _name = "Taxer";
    string constant _symbol = "TAXER";
    uint8 constant _decimals = 18;

    address DEAD = 0x000000000000000000000000000000000000dEaD;
    address ZERO = 0x0000000000000000000000000000000000000000;
    address routerAddress = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;

    uint256 _totalSupply = 1000000 * (10**_decimals);
    uint256 public biggestBuy = 0;
    uint256 public lastTaxerChange = 0;
    uint256 public resetPeriod = 1 hours;
    mapping(address => uint256) _balances;
    mapping(address => mapping(address => uint256)) _allowances;
    mapping(address => bool) public isFeeExempt;
    mapping(address => bool) public isTxLimitExempt;
    mapping(address => bool) public hasSold;

    uint256 public liquidityFee = 0;
    uint256 public marketingFee = 20;
    uint256 public TaxerFee = 0;
    uint256 public totalFee = 0;
    uint256 public totalFeeIfSelling = 20;
    address public autoLiquidityReceiver;
    address public marketingWallet;
    address public Taxer;

    IDEXRouter public router;
    address public pair;

    bool inSwapAndLiquify;
    bool public swapAndLiquifyEnabled = true;
    uint256 private _maxTxAmount = (_totalSupply * 2) / 100;
    uint256 private _maxWalletAmount = (_totalSupply * 2) / 100;
    uint256 public swapThreshold = (_totalSupply * 5) / 1000;

    // Function to remove the limits on max wallet and max transaction
    function removeLimits() external onlyOwner {
        _maxTxAmount = _totalSupply;
        _maxWalletAmount = _totalSupply;
    }

    modifier lockTheSwap() {
        inSwapAndLiquify = true;
        _;
        inSwapAndLiquify = false;
    }
    event AutoLiquify(uint256 amountETH, uint256 amountToken);
    event NewTaxer(address Taxer, uint256 buyAmount);
    event TaxerPayout(address Taxer, uint256 amountETH);
    event TaxerSold(address Taxer, uint256 amountETH);

    constructor() Auth(msg.sender) {
        router = IDEXRouter(routerAddress);
        pair = IDEXFactory(router.factory()).createPair(
            router.WETH(),
            address(this)
        );
        _allowances[address(this)][address(router)] = uint256(-1);
        isFeeExempt[DEAD] = true;
        isTxLimitExempt[DEAD] = true;
        isFeeExempt[msg.sender] = true;
        isFeeExempt[address(this)] = true;
        isTxLimitExempt[msg.sender] = true;
        isTxLimitExempt[pair] = true;
        autoLiquidityReceiver = msg.sender;
        marketingWallet = msg.sender;
        Taxer = msg.sender;
        totalFee = liquidityFee.add(marketingFee).add(TaxerFee);
        totalFeeIfSelling = totalFee;
        _balances[msg.sender] = _totalSupply;
        emit Transfer(address(0), msg.sender, _totalSupply);
    }

    receive() external payable {}

    function name() external pure override returns (string memory) {
        return _name;
    }

    function symbol() external pure override returns (string memory) {
        return _symbol;
    }

    function decimals() external pure override returns (uint8) {
        return _decimals;
    }

    function totalSupply() external view override returns (uint256) {
        return _totalSupply;
    }

    function getOwner() external view override returns (address) {
        return owner;
    }

    function getCirculatingSupply() public view returns (uint256) {
        return _totalSupply.sub(balanceOf(DEAD)).sub(balanceOf(ZERO));
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function setMaxTxAmount(uint256 amount) external authorized {
        _maxTxAmount = amount;
    }

    function setFees(
        uint256 newLiquidityFee,
        uint256 newMarketingFee,
        uint256 newTaxerFee
    ) external authorized {
        liquidityFee = newLiquidityFee;
        marketingFee = newMarketingFee;
        TaxerFee = newTaxerFee;
        totalFee = liquidityFee.add(marketingFee).add(TaxerFee);
        totalFeeIfSelling = totalFee;
    }

    function allowance(address holder, address spender)
        external
        view
        override
        returns (uint256)
    {
        return _allowances[holder][spender];
    }

    function approve(address spender, uint256 amount)
        public
        override
        returns (bool)
    {
        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function approveMax(address spender) external returns (bool) {
        return approve(spender, uint256(-1));
    }

    function setIsFeeExempt(address holder, bool exempt) external authorized {
        isFeeExempt[holder] = exempt;
    }

    function setIsTxLimitExempt(address holder, bool exempt)
        external
        authorized
    {
        isTxLimitExempt[holder] = exempt;
    }

    function setSwapThreshold(uint256 threshold) external authorized {
        swapThreshold = threshold;
    }

    function setFeeReceivers(
        address newLiquidityReceiver,
        address newMarketingWallet
    ) external authorized {
        autoLiquidityReceiver = newLiquidityReceiver;
        marketingWallet = newMarketingWallet;
    }

    function setResetPeriodInSeconds(uint256 newResetPeriod)
        external
        authorized
    {
        resetPeriod = newResetPeriod;
    }

    function _reset() internal {
        Taxer = marketingWallet;
        biggestBuy = 0;
        lastTaxerChange = block.timestamp;
    }

    function epochReset() external view returns (uint256) {
        return lastTaxerChange + resetPeriod;
    }

    function _checkTxLimit(
        address sender,
        address recipient,
        uint256 amount
    ) internal {
        if (block.timestamp - lastTaxerChange > resetPeriod) {
            _reset();
        }
        if (
            sender != owner &&
            recipient != owner &&
            !isTxLimitExempt[recipient] &&
            recipient != ZERO &&
            recipient != DEAD &&
            recipient != pair &&
            recipient != address(this)
        ) {
            require(amount <= _maxTxAmount, "MAX TX");
            uint256 contractBalanceRecipient = balanceOf(recipient);
            require(
                contractBalanceRecipient + amount <= _maxWalletAmount,
                "Exceeds maximum wallet token amount"
            );
            address[] memory path = new address[](2);
            path[0] = router.WETH();
            path[1] = address(this);
            uint256 usedEth = router.getAmountsIn(amount, path)[0];
            if (!hasSold[recipient] && usedEth > biggestBuy) {
                Taxer = recipient;
                biggestBuy = usedEth;
                lastTaxerChange = block.timestamp;
                emit NewTaxer(Taxer, biggestBuy);
            }
        }
        if (
            sender != owner &&
            recipient != owner &&
            !isTxLimitExempt[sender] &&
            sender != pair &&
            recipient != address(this)
        ) {
            require(amount <= _maxTxAmount, "MAX TX");
            if (Taxer == sender) {
                emit TaxerSold(Taxer, biggestBuy);
                _reset();
            }
            hasSold[sender] = true;
        }
    }

    function setSwapBackSettings(bool enableSwapBack, uint256 newSwapBackLimit)
        external
        authorized
    {
        swapAndLiquifyEnabled = enableSwapBack;
        swapThreshold = newSwapBackLimit;
    }

    function transfer(address recipient, uint256 amount)
        external
        override
        returns (bool)
    {
        return _transferFrom(msg.sender, recipient, amount);
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external override returns (bool) {
        if (_allowances[sender][msg.sender] != uint256(-1)) {
            _allowances[sender][msg.sender] = _allowances[sender][msg.sender]
                .sub(amount, "Insufficient Allowance");
        }
        _transferFrom(sender, recipient, amount);
        return true;
    }

    function _transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) internal returns (bool) {
        if (inSwapAndLiquify) {
            return _basicTransfer(sender, recipient, amount);
        }
        if (
            msg.sender != pair &&
            !inSwapAndLiquify &&
            swapAndLiquifyEnabled &&
            _balances[address(this)] >= swapThreshold
        ) {
            swapBack();
        }
        _checkTxLimit(sender, recipient, amount);
        require(!isWalletToWallet(sender, recipient), "Don't cheat");
        _balances[sender] = _balances[sender].sub(
            amount,
            "Insufficient Balance"
        );
        uint256 amountReceived = !isFeeExempt[sender] && !isFeeExempt[recipient]
            ? takeFee(sender, recipient, amount)
            : amount;
        _balances[recipient] = _balances[recipient].add(amountReceived);
        emit Transfer(msg.sender, recipient, amountReceived);
        return true;
    }

    function _basicTransfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal returns (bool) {
        _balances[sender] = _balances[sender].sub(
            amount,
            "Insufficient Balance"
        );
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
        return true;
    }

    function takeFee(
        address sender,
        address recipient,
        uint256 amount
    ) internal returns (uint256) {
        uint256 feeApplicable = pair == recipient
            ? totalFeeIfSelling
            : totalFee;
        uint256 feeAmount = amount.mul(feeApplicable).div(100);
        _balances[address(this)] = _balances[address(this)].add(feeAmount);
        emit Transfer(sender, address(this), feeAmount);
        return amount.sub(feeAmount);
    }

    function isWalletToWallet(address sender, address recipient)
        internal
        view
        returns (bool)
    {
        if (isFeeExempt[sender] || isFeeExempt[recipient]) {
            return false;
        }
        if (sender == pair || recipient == pair) {
            return false;
        }
        return true;
    }

    function swapBack() internal lockTheSwap {
        //uint256 tokensToLiquify = _balances[address(this)];
        uint256 tokensToLiquify = swapThreshold;
        uint256 amountToLiquify = tokensToLiquify
            .mul(liquidityFee)
            .div(totalFee)
            .div(2);
        uint256 amountToSwap = tokensToLiquify.sub(amountToLiquify);

        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = router.WETH();

        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amountToSwap,
            0,
            path,
            address(this),
            block.timestamp
        );

        uint256 amountETH = address(this).balance;
        uint256 totalETHFee = totalFee.sub(liquidityFee.div(2));
        uint256 amountETHMarketing = amountETH.mul(marketingFee).div(
            totalETHFee
        );
        uint256 amountETHTaxer = amountETH.mul(TaxerFee).div(totalETHFee);
        uint256 amountETHLiquidity = amountETH
            .mul(liquidityFee)
            .div(totalETHFee)
            .div(2);

        (bool tmpSuccess, ) = payable(marketingWallet).call{
            value: amountETHMarketing,
            gas: 30000
        }("");
        (bool tmpSuccess2, ) = payable(Taxer).call{
            value: amountETHTaxer,
            gas: 30000
        }("");
        emit TaxerPayout(Taxer, amountETHTaxer);

        // only to supress warning msg
        tmpSuccess = false;
        tmpSuccess2 = false;

        if (amountToLiquify > 0) {
            router.addLiquidityETH{value: amountETHLiquidity}(
                address(this),
                amountToLiquify,
                0,
                0,
                autoLiquidityReceiver,
                block.timestamp
            );
            emit AutoLiquify(amountETHLiquidity, amountToLiquify);
        }
    }

    function recoverLosteth() external authorized {
        payable(msg.sender).transfer(address(this).balance);
    }

    function recoverLostTokens(address _token, uint256 _amount)
        external
        authorized
    {
        IERC20(_token).transfer(msg.sender, _amount);
    }
}