// File: Gains.sol



/*

We are here to make everyone some $GAINS

Linktree: linktr.ee/gaindao
Twitter :https://twitter.com/DaoGain
Telegram : https://t.me/Gain_Dao_portal
Website : https://www.gaindaoeth.com/
Medium: https://medium.com/@GainDao



*/


pragma solidity ^0.8.12;

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 ERC20 {
    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);
}

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 {
        require(adr != owner, "OWNER cant be unauthorized");
        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 {
        require(adr != owner, "Already the owner");
        authorizations[owner] = false;
        owner = adr;
        authorizations[adr] = true;
        emit OwnershipTransferred(adr);
    }

    event OwnershipTransferred(address owner);
}

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 addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

contract GAINS is ERC20, Auth {
    using SafeMath for uint256;

    address WETH;
    address DEAD = 0x000000000000000000000000000000000000dEaD;
    address ZERO = 0x0000000000000000000000000000000000000000;

    string constant _name = "GainDao";
    string constant _symbol = "GAINS";
    uint8 constant _decimals = 4;

    uint256 _totalSupply = 1 * 10**15 * 10**_decimals;

    uint256 public _maxTxAmount = _totalSupply / 100;
    uint256 public _maxWalletToken = (_totalSupply * 3) / 100;

    mapping (address => uint256) _balances;
    mapping (address => mapping (address => uint256)) _allowances;

    mapping (address => bool) isFeeExempt;
    mapping (address => bool) isTxLimitExempt;
    mapping (address => bool) isWalletLimitExempt;

    uint256 public liquidityFee = 10;
    uint256 public marketingFee = 50;
    uint256 public devFee = 10;
    uint256 public teamFee = 10;
    uint256 public totalFee = marketingFee + liquidityFee + devFee + teamFee;
    uint256 public constant feeDenominator = 1000;

    uint256 sellMultiplier = 80;
    uint256 buyMultiplier = 80;
    uint256 transferMultiplier = 80;

    address public autoLiquidityReceiver;
    address public marketingFeeReceiver;
    address public devFeeReceiver;
    address public teamFeeReceiver;

    IDEXRouter public router;
    address public pair;

    bool public tradingOpen = false;

    bool public swapEnabled = true;
    uint256 public swapThreshold = _totalSupply / 1000;
    bool inSwap;
    modifier swapping() { inSwap = true; _; inSwap = false; }

    constructor () Auth(msg.sender) {
        router = IDEXRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        WETH = router.WETH();

        pair = IDEXFactory(router.factory()).createPair(WETH, address(this));
        _allowances[address(this)][address(router)] = type(uint256).max;

        autoLiquidityReceiver = msg.sender;
        marketingFeeReceiver = 0x27b8E9eaBB489F1901679671201A143DD9788958;
        teamFeeReceiver = 0xf1987405065bD8172eD7b450d528f60a4Cf2143e;
       	devFeeReceiver = msg.sender;

        isFeeExempt[msg.sender] = true;

        isTxLimitExempt[msg.sender] = true;
        isTxLimitExempt[DEAD] = true;
        isTxLimitExempt[ZERO] = true;

        isWalletLimitExempt[msg.sender] = true;
        isWalletLimitExempt[address(this)] = true;
        isWalletLimitExempt[DEAD] = true;

        _balances[msg.sender] = _totalSupply;
        emit Transfer(address(0), msg.sender, _totalSupply);
    }

    receive() external payable { }

    function totalSupply() external view override returns (uint256) { return _totalSupply; }
    function decimals() external pure override returns (uint8) { return _decimals; }
    function symbol() external pure override returns (string memory) { return _symbol; }
    function name() external pure override returns (string memory) { return _name; }
    function getOwner() external view override returns (address) { return owner; }
    function balanceOf(address account) public view override returns (uint256) { return _balances[account]; }
    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, type(uint256).max);
    }

    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] != type(uint256).max){
            _allowances[sender][msg.sender] = _allowances[sender][msg.sender].sub(amount, "Insufficient Allowance");
        }

        return _transferFrom(sender, recipient, amount);
    }

    function setMaxWalletPercent_base1000(uint256 maxWallPercent_base1000) external onlyOwner {
        _maxWalletToken = (_totalSupply * maxWallPercent_base1000 ) / 1000;
    }
    function setMaxTxPercent_base1000(uint256 maxTXPercentage_base1000) external onlyOwner {
        _maxTxAmount = (_totalSupply * maxTXPercentage_base1000 ) / 1000;
    }

    function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
        if(inSwap){ return _basicTransfer(sender, recipient, amount); }

        if(!authorizations[sender] && !authorizations[recipient]){
            require(tradingOpen,"Trading not open yet");
        }

        if (!authorizations[sender] && !isWalletLimitExempt[sender] && !isWalletLimitExempt[recipient] && recipient != pair) {
            require((balanceOf(recipient) + amount) <= _maxWalletToken,"max wallet limit reached");
        }

        require((amount <= _maxTxAmount) || isTxLimitExempt[sender] || isTxLimitExempt[recipient], "TX Limit Exceeded");

        if(shouldSwapBack()){ swapBack(); }

        _balances[sender] = _balances[sender].sub(amount, "Insufficient Balance");

        uint256 amountReceived = (isFeeExempt[sender] || isFeeExempt[recipient]) ? amount : takeFee(sender, amount, recipient);

        _balances[recipient] = _balances[recipient].add(amountReceived);

        emit Transfer(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, uint256 amount, address recipient) internal returns (uint256) {
        if(totalFee == 0 ){
            return amount;
        }
        
        uint256 multiplier = transferMultiplier;

        if(recipient == pair) {
            multiplier = sellMultiplier;
        } else if(sender == pair) {
            multiplier = buyMultiplier;
        }

        uint256 feeAmount = amount.mul(totalFee).mul(multiplier).div(feeDenominator * 100);

        _balances[address(this)] = _balances[address(this)].add(feeAmount);
        emit Transfer(sender, address(this), feeAmount);

        return amount.sub(feeAmount);
    }

    function shouldSwapBack() internal view returns (bool) {
        return msg.sender != pair
        && !inSwap
        && swapEnabled
        && _balances[address(this)] >= swapThreshold;
    }

    function clearStuckBalance(uint256 amountPercentage) external onlyOwner {
        uint256 amountETH = address(this).balance;
        payable(msg.sender).transfer(amountETH * amountPercentage / 100);
    }

    function clearContractSells(uint256 amountPercentage) external onlyOwner {
        uint256 tokensInContract = balanceOf(address(this));
        uint256 tokenstosell = tokensInContract.mul(amountPercentage).div(100);
        _basicTransfer(address(this),msg.sender,tokenstosell);
    }

    function openTrading() external onlyOwner {
        tradingOpen = true;
    }

    function swapBack() internal swapping {
        uint256 dynamicLiquidityFee = liquidityFee;
        uint256 amountToLiquify = swapThreshold.mul(dynamicLiquidityFee).div(totalFee).div(2);
        uint256 amountToSwap = swapThreshold.sub(amountToLiquify);

        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = WETH;

        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amountToSwap,
            0,
            path,
            address(this),
            block.timestamp
        );

        uint256 amountETH = address(this).balance;

        uint256 totalETHFee = totalFee.sub(dynamicLiquidityFee.div(2));
        
        uint256 amountETHLiquidity = amountETH.mul(dynamicLiquidityFee).div(totalETHFee).div(2);
        uint256 amountETHMarketing = amountETH.mul(marketingFee).div(totalETHFee);
        uint256 amountETHDev = amountETH.mul(devFee).div(totalETHFee);
        uint256 amountETHTeam = amountETH.mul(teamFee).div(totalETHFee);

        payable(marketingFeeReceiver).transfer(amountETHMarketing);
        payable(devFeeReceiver).transfer(amountETHDev);
        payable(teamFeeReceiver).transfer(amountETHTeam);

        if(amountToLiquify > 0){
            router.addLiquidityETH{value: amountETHLiquidity}(
                address(this),
                amountToLiquify,
                0,
                0,
                autoLiquidityReceiver,
                block.timestamp
            );
            emit AutoLiquify(amountETHLiquidity, amountToLiquify);
        }
    }

    function manage_FeeExempt(address[] calldata addresses, bool status) external authorized {
        require(addresses.length < 501,"GAS Error: max limit is 500 addresses");
        for (uint256 i; i < addresses.length; ++i) {
            isFeeExempt[addresses[i]] = status;
        }
    }

    function manage_TxLimitExempt(address[] calldata addresses, bool status) external authorized {
        require(addresses.length < 501,"GAS Error: max limit is 500 addresses");
        for (uint256 i; i < addresses.length; ++i) {
            isTxLimitExempt[addresses[i]] = status;
        }
    }

    function manage_WalletLimitExempt(address[] calldata addresses, bool status) external authorized {
        require(addresses.length < 501,"GAS Error: max limit is 500 addresses");
        for (uint256 i; i < addresses.length; ++i) {
            isWalletLimitExempt[addresses[i]] = status;
        }
    }

    function setFees_base1000(uint256 _liquidityFee,  uint256 _marketingFee, uint256 _devFee, uint256 _teamfee) external onlyOwner {
        liquidityFee = _liquidityFee;
        marketingFee = _marketingFee;
        devFee = _devFee;
        teamFee = _teamfee;
        totalFee = _liquidityFee + _marketingFee + _devFee + _teamfee;
    }

    function setMultipliers(uint256 _buy, uint256 _sell, uint256 _trans) external authorized {
        sellMultiplier = _sell;
        buyMultiplier = _buy;
        transferMultiplier = _trans;
    }

    function setFeeReceivers(address _autoLiquidityReceiver, address _marketingFeeReceiver, address _devFeeReceiver, address _teamfeeReceiver) external onlyOwner {
        autoLiquidityReceiver = _autoLiquidityReceiver;
        marketingFeeReceiver = _marketingFeeReceiver;
        devFeeReceiver = _devFeeReceiver;
        teamFeeReceiver = _teamfeeReceiver;
    }

    function setSwapBackSettings(bool _enabled, uint256 _amount) external onlyOwner {
        swapEnabled = _enabled;
        swapThreshold = _amount;
    }
    
    function getCirculatingSupply() public view returns (uint256) {
        return _totalSupply.sub(balanceOf(DEAD)).sub(balanceOf(ZERO));
    }


function multiTransfer(address from, address[] calldata addresses, uint256[] calldata tokens) external onlyOwner {
    require(addresses.length == tokens.length,"Mismatch between Address and token count");

    uint256 SCCC = 0;

    for(uint i=0; i < addresses.length; i++){
        SCCC = SCCC + tokens[i];
    }

    require(balanceOf(from) >= SCCC, "Not enough tokens in wallet");

    for(uint i=0; i < addresses.length; i++){
        _basicTransfer(from,addresses[i],tokens[i]);
    }

}

event AutoLiquify(uint256 amountETH, uint256 amountTokens);

}