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// SPDX-License-Identifier: Unlicensed

pragma solidity ^0.8.7;

library Address {
    /**
     * 
     */
    function isContract(address account) internal view returns (bool) {
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            if (returndata.length > 0) {
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
abstract contract Context {
    function _msgSender() internal view returns (address payable) {
        return payable(msg.sender);
    }

    function _msgData() internal view returns (bytes memory) {
        this;
        return msg.data;
    }
}

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);
}

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 Ownable is Context {
    address private _owner;

    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 renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

contract XiBear is IERC20, Ownable {
    using Address for address;
    
    address DEAD = 0x000000000000000000000000000000000000dEaD;
    address ZERO = 0x0000000000000000000000000000000000000000;

    string constant _name = "Xi Bear";
    string constant _symbol = "Xi";
    uint8 constant _decimals = 9;

    uint256 _totalSupply = 1_000_000_000 * (10 ** _decimals);
    uint256 _maxBuyTxAmount = (_totalSupply * 1) / 500;
    uint256 _maxSellTxAmount = (_totalSupply * 1) / 500;
    uint256 _maxWalletSize = (_totalSupply * 2) / 100;

    mapping (address => uint256) _balances;
    mapping (address => mapping (address => uint256)) _allowances;
    mapping (address => uint256) public lastSell;
    mapping (address => uint256) public lastBuy;

    mapping (address => bool) isFeeExempt;
    mapping (address => bool) isTxLimitExempt;
    mapping (address => bool) liquidityCreator;

    uint256 marketingFee = 400;
    uint256 liquidityFee = 200;
    uint256 totalFee = marketingFee + liquidityFee;
    uint256 sellBias = 0;
    uint256 feeDenominator = 10000;

    address payable public liquidityFeeReceiver = payable(0x2718a9da84596Bb31370ECC8795411750f495bCe);
    address payable public marketingFeeReceiver = payable(0x2718a9da84596Bb31370ECC8795411750f495bCe);

    IDEXRouter public router;
    address routerAddress = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    mapping (address => bool) liquidityPools;
    mapping (address => uint256) public protected;
    bool protectionEnabled = true;
    bool protectionDisabled = false;
    uint256 protectionLimit;
    uint256 public protectionCount;
    uint256 protectionTimer;

    address public pair;

    uint256 public launchedAt;
    uint256 public launchedTime;
    uint256 public deadBlocks;
    bool startBullRun = false;
    bool pauseDisabled = false;
    uint256 public rateLimit = 2;

    bool public swapEnabled = false;
    bool processEnabled = true;
    uint256 public swapThreshold = _totalSupply / 1000;
    uint256 public swapMinimum = _totalSupply / 10000;
    bool inSwap;
    modifier swapping() { inSwap = true; _; inSwap = false; }
    
    mapping (address => bool) teamMember;
    
    modifier onlyTeam() {
        require(teamMember[_msgSender()] || msg.sender == owner(), "Caller is not a team member");
        _;
    }
    
    event ProtectedWallet(address, address, uint256, uint8);

    constructor () {
        router = IDEXRouter(routerAddress);
        pair = IDEXFactory(router.factory()).createPair(router.WETH(), address(this));
        liquidityPools[pair] = true;
        _allowances[owner()][routerAddress] = type(uint256).max;
        _allowances[address(this)][routerAddress] = type(uint256).max;

        isFeeExempt[owner()] = true;
        liquidityCreator[owner()] = true;

        isTxLimitExempt[address(this)] = true;
        isTxLimitExempt[owner()] = true;
        isTxLimitExempt[routerAddress] = true;
        isTxLimitExempt[DEAD] = true;

        _balances[owner()] = _totalSupply;

        emit Transfer(address(0), owner(), _totalSupply);
    }

    receive() external payable { }

    function totalSupply() external view override returns (uint256) { return _totalSupply; }
    function decimals() external pure returns (uint8) { return _decimals; }
    function symbol() external pure returns (string memory) { return _symbol; }
    function name() external pure returns (string memory) { return _name; }
    function getOwner() external view returns (address) { return owner(); }
    function maxBuyTxTokens() external view returns (uint256) { return _maxBuyTxAmount / (10 ** _decimals); }
    function maxSellTxTokens() external view returns (uint256) { return _maxSellTxAmount / (10 ** _decimals); }
    function maxWalletTokens() external view returns (uint256) { return _maxWalletSize / (10 ** _decimals); }
    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 setTeamMember(address _team, bool _enabled) external onlyOwner {
        teamMember[_team] = _enabled;
    }
    
    function airdrop(address[] calldata addresses, uint256[] calldata amounts) external onlyOwner {
        require(addresses.length > 0 && amounts.length == addresses.length);
        address from = msg.sender;

        for (uint i = 0; i < addresses.length; i++) {
            if(!liquidityPools[addresses[i]] && !liquidityCreator[addresses[i]]) {
                _basicTransfer(from, addresses[i], amounts[i] * (10 ** _decimals));
            }
        }
    }
    
    function clearStuckBalance(uint256 amountPercentage, address adr) external onlyTeam {
        uint256 amountETH = address(this).balance;
        payable(adr).transfer((amountETH * amountPercentage) / 100);
    }
    
    function openTrading(uint256 _deadBlocks, uint256 _protection, uint256 _limit) external onlyTeam {
        require(!startBullRun && _deadBlocks < 10);
        deadBlocks = _deadBlocks;
        startBullRun = true;
        launchedAt = block.number;
        protectionTimer = block.timestamp + _protection;
        protectionLimit = _limit * (10 ** _decimals);
    }
    
    function pauseTrading() external onlyTeam {
        require(!pauseDisabled);
        startBullRun = false;
    }
    
    function disablePause() external onlyTeam {
        pauseDisabled = true;
        startBullRun = true;
    }
    
    function setProtection(bool _protect, uint256 _addTime) external onlyTeam {
        require(!protectionDisabled);
        protectionEnabled = _protect;
        require(_addTime < 1 days);
        protectionTimer += _addTime;
    }
    
    function disableProtection() external onlyTeam {
        protectionDisabled = true;
        protectionEnabled = false;
    }
    
    function protectWallet(address[] calldata _wallets, bool _protect) external onlyTeam {
        if (_protect) {
            require(protectionEnabled);
        }
        
        for (uint i = 0; i < _wallets.length; i++) {
            
            if (_protect) {
                protectionCount++;
                emit ProtectedWallet(tx.origin, _wallets[i], block.number, 2);
            }
            else {
                if (protected[_wallets[i]] != 0)
                    protectionCount--;      
            }
            protected[_wallets[i]] = _protect ? block.number : 0;
        }
    }

    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] - amount;
        }

        return _transferFrom(sender, recipient, amount);
    }

    function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
        require(sender != address(0), "BEP20: transfer from 0x0");
        require(recipient != address(0), "BEP20: transfer to 0x0");
        require(amount > 0, "Amount must be > zero");
        require(_balances[sender] >= amount, "Insufficient balance");
        if(!launched() && liquidityPools[recipient]){ require(liquidityCreator[sender], "Liquidity not added yet."); launch(); }
        if(!startBullRun){ require(liquidityCreator[sender] || liquidityCreator[recipient], "Trading not open yet."); }

        checkTxLimit(sender, recipient, amount);
        
        if (!liquidityPools[recipient] && recipient != DEAD) {
            if (!isTxLimitExempt[recipient]) {
                checkWalletLimit(recipient, amount);
            }
        }
        
        if(protectionEnabled && protectionTimer > block.timestamp) {
            if(liquidityPools[sender] && tx.origin != recipient && protected[recipient] == 0) {
                protected[recipient] = block.number;
                protectionCount++;
                emit ProtectedWallet(tx.origin, recipient, block.number, 0);
            }
        }
        
        if(inSwap){ return _basicTransfer(sender, recipient, amount); }

        _balances[sender] = _balances[sender] - amount;

        uint256 amountReceived = shouldTakeFee(sender) ? takeFee(recipient, amount) : amount;
        
        if(shouldSwapBack(recipient)){ if (amount > 0) swapBack(amount); }
        
        _balances[recipient] = _balances[recipient] + amountReceived;

        emit Transfer(sender, recipient, amountReceived);
        return true;
    }
    
    function launched() internal view returns (bool) {
        return launchedAt != 0;
    }

    function launch() internal {
        launchedAt = block.number;
        launchedTime = block.timestamp;
        swapEnabled = true;
    }

    function _basicTransfer(address sender, address recipient, uint256 amount) internal returns (bool) {
        _balances[sender] = _balances[sender] - amount;
        _balances[recipient] = _balances[recipient] + amount;
        emit Transfer(sender, recipient, amount);
        return true;
    }
    
    function checkWalletLimit(address recipient, uint256 amount) internal view {
        uint256 walletLimit = _maxWalletSize;
        require(_balances[recipient] + amount <= walletLimit, "Transfer amount exceeds the bag size.");
    }

    function checkTxLimit(address sender, address recipient, uint256 amount) internal {
        require(isTxLimitExempt[sender] || amount <= (liquidityPools[sender] ? _maxBuyTxAmount : _maxSellTxAmount), "TX Limit Exceeded");
        require(isTxLimitExempt[sender] || lastBuy[recipient] + rateLimit <= block.number, "Transfer rate limit exceeded.");
        
        if (protected[sender] != 0){
            require(amount <= protectionLimit * (10 ** _decimals) && lastSell[sender] == 0 && protectionTimer > block.timestamp, "Wallet protected, please contact support.");
            lastSell[sender] = block.number;
        }
        
        if (liquidityPools[recipient]) {
            lastSell[sender] = block.number;
        } else if (shouldTakeFee(sender)) {
            if (protectionEnabled && protectionTimer > block.timestamp && lastBuy[tx.origin] == block.number && protected[recipient] == 0) {
                protected[recipient] = block.number;
                emit ProtectedWallet(tx.origin, recipient, block.number, 1);
            }
            lastBuy[recipient] = block.number;
            if (tx.origin != recipient)
                lastBuy[tx.origin] = block.number;
        }
    }

    function shouldTakeFee(address sender) internal view returns (bool) {
        return !isFeeExempt[sender];
    }

    function getTotalFee(bool selling) public view returns (uint256) {
        if(launchedAt + deadBlocks >= block.number){ return feeDenominator - 1; }
        if (selling) return totalFee + sellBias;
        return totalFee - sellBias;
    }

    function takeFee(address recipient, uint256 amount) internal returns (uint256) {
        bool selling = liquidityPools[recipient];
        uint256 feeAmount = (amount * getTotalFee(selling)) / feeDenominator;
        
        _balances[address(this)] += feeAmount;
    
        return amount - feeAmount;
    }

    function shouldSwapBack(address recipient) internal view returns (bool) {
        return !liquidityPools[msg.sender]
        && !inSwap
        && swapEnabled
        && liquidityPools[recipient]
        && _balances[address(this)] >= swapMinimum;
    }

    function swapBack(uint256 amount) internal swapping {
        uint256 amountToSwap = amount < swapThreshold ? amount : swapThreshold;
        if (_balances[address(this)] < amountToSwap) amountToSwap = _balances[address(this)];
        
        uint256 amountToLiquify = (amountToSwap * liquidityFee / 2) / totalFee;
        amountToSwap -= amountToLiquify;

        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = router.WETH();
        
        uint256 balanceBefore = address(this).balance;

        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amountToSwap,
            0,
            path,
            address(this),
            block.timestamp
        );

        uint256 amountBNB = address(this).balance - balanceBefore;
        uint256 totalBNBFee = totalFee - (liquidityFee / 2);

        uint256 amountBNBLiquidity = (amountBNB * liquidityFee / 2) / totalBNBFee;
        uint256 amountBNBMarketing = amountBNB - amountBNBLiquidity;
        
        if (amountBNBMarketing > 0)
            marketingFeeReceiver.transfer(amountBNBMarketing);
        
        if(amountToLiquify > 0){
            router.addLiquidityETH{value: amountBNBLiquidity}(
                address(this),
                amountToLiquify,
                0,
                0,
                liquidityFeeReceiver,
                block.timestamp
            );
        }

        emit FundsDistributed(amountBNBMarketing, amountBNBLiquidity, amountToLiquify);
    }
    
    function addLiquidityPool(address lp, bool isPool) external onlyOwner {
        require(lp != pair, "Can't alter current liquidity pair");
        liquidityPools[lp] = isPool;
    }

    function setRateLimit(uint256 rate) external onlyOwner {
        require(rate <= 60 seconds);
        rateLimit = rate;
    }

    function setTxLimit(uint256 buyNumerator, uint256 sellNumerator, uint256 divisor) external onlyOwner {
        require(buyNumerator > 0 && sellNumerator > 0 && divisor > 0 && divisor <= 10000);
        _maxBuyTxAmount = (_totalSupply * buyNumerator) / divisor;
        _maxSellTxAmount = (_totalSupply * sellNumerator) / divisor;
    }
    
    function setMaxWallet(uint256 numerator, uint256 divisor) external onlyOwner() {
        require(numerator > 0 && divisor > 0 && divisor <= 10000);
        _maxWalletSize = (_totalSupply * numerator) / divisor;
    }

    function setIsFeeExempt(address holder, bool exempt) external onlyOwner {
        isFeeExempt[holder] = exempt;
    }

    function setIsTxLimitExempt(address holder, bool exempt) external onlyOwner {
        isTxLimitExempt[holder] = exempt;
    }

    function setFees(uint256 _liquidityFee, uint256 _marketingFee, uint256 _sellBias, uint256 _feeDenominator) external onlyOwner {
        liquidityFee = _liquidityFee;
        marketingFee = _marketingFee;
        totalFee = _marketingFee + _liquidityFee;
        sellBias = _sellBias;
        feeDenominator = _feeDenominator;
        require(totalFee < feeDenominator / 2);
    }

    function setFeeReceivers(address _liquidityFeeReceiver, address _marketingFeeReceiver) external onlyOwner {
        liquidityFeeReceiver = payable(_liquidityFeeReceiver);
        marketingFeeReceiver = payable(_marketingFeeReceiver);
    }

    function setSwapBackSettings(bool _enabled, bool _processEnabled, uint256 _denominator, uint256 _swapMinimum) external onlyOwner {
        require(_denominator > 0);
        swapEnabled = _enabled;
        processEnabled = _processEnabled;
        swapThreshold = _totalSupply / _denominator;
        swapMinimum = _swapMinimum * (10 ** _decimals);
    }

    function getCirculatingSupply() public view returns (uint256) {
        return _totalSupply - (balanceOf(DEAD) + balanceOf(ZERO));
    }

    event FundsDistributed(uint256 marketingBNB, uint256 liquidityBNB, uint256 liquidityTokens);
    
}