// File: contracts/lend.sol



// SPDX-License-Identifier: MIT

/**

Twitter:   https://x.com/LendXYZ
Telegram:  https://t.me/LendPortal
Site:      https://lendprotocol.xyz
 
*/

pragma solidity 0.8.17;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        this;
        return msg.data;
    }
}

library Address {
    function isContract(address account) internal view returns (bool) {
        return account.code.length > 0;
    }

    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
            functionCallWithValue(
                target,
                data,
                0,
                "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);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    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"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    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"
        );
        (bool success, bytes memory returndata) = target.call{value: value}(
            data
        );
        return
            verifyCallResultFromTarget(
                target,
                success,
                returndata,
                errorMessage
            );
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data
    ) internal view returns (bytes memory) {
        return
            functionStaticCall(
                target,
                data,
                "Address: low-level static call failed"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return
            verifyCallResultFromTarget(
                target,
                success,
                returndata,
                errorMessage
            );
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data
    ) internal returns (bytes memory) {
        return
            functionDelegateCall(
                target,
                data,
                "Address: low-level delegate call failed"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return
            verifyCallResultFromTarget(
                target,
                success,
                returndata,
                errorMessage
            );
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(
        bytes memory returndata,
        string memory errorMessage
    ) private pure {
        if (returndata.length > 0) {
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

library SafeERC20 {
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transfer.selector, to, value)
        );
    }

    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        bytes memory returndata = address(token).functionCall(
            data,
            "SafeERC20: low-level call failed"
        );
        if (returndata.length > 0) {
            require(
                abi.decode(returndata, (bool)),
                "SafeERC20: ERC20 operation did not succeed"
            );
        }
    }
}

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 IERC20Metadata is IERC20 {
    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);
}

contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    function name() public view virtual override returns (string memory) {
        return _name;
    }

    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(
        address account
    ) public view virtual override returns (uint256) {
        return _balances[account];
    }

    function transfer(
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(
        address owner,
        address spender
    ) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(
        address spender,
        uint256 amount
    ) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(
            currentAllowance >= amount,
            "ERC20: transfer amount exceeds allowance"
        );
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

    function increaseAllowance(
        address spender,
        uint256 addedValue
    ) public virtual returns (bool) {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][spender] + addedValue
        );
        return true;
    }

    function decreaseAllowance(
        address spender,
        uint256 subtractedValue
    ) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(
            currentAllowance >= subtractedValue,
            "ERC20: decreased allowance below zero"
        );
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        uint256 senderBalance = _balances[sender];
        require(
            senderBalance >= amount,
            "ERC20: transfer amount exceeds balance"
        );
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);
    }

    function _createInitialSupply(
        address account,
        uint256 amount
    ) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);
    }

    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        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);
    }
}

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() external 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;
    }
}

interface ILpPair {
    function sync() external;
}

interface IDexRouter {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);

    function getAmountsOut(
        uint amountIn,
        address[] calldata path
    ) external view returns (uint[] memory amounts);
}

interface IDexFactory {
    function createPair(
        address tokenA,
        address tokenB
    ) external returns (address pair);
}

contract LEND is ERC20, Ownable {
    uint256 public maxBuyAmount;
    uint256 public maxHoldingAmount;

    IDexRouter public immutable dexRouter;
    address public immutable lpPair;

    IERC20 public immutable WETH;

    bool public tokenHoldingsRequiredToBuy;

    bool private swapping;
    uint256 public swapTokensAtAmount;

    address public taxAddress = 0xF5c30982487C6CdF501eb655040202c52e8770d7;
    address public lpWalletAddress = 0x6845F128a2D0c57c014EBF0da92DC61a8Cc5891a;

    uint256 public tradingActiveBlock = 0;

    bool public limitsInEffect = true;
    bool public tradingActive = false;
    bool public swapEnabled = false;

    mapping(address => uint256) private _holderLastTransferBlock;
    bool public transferDelayEnabled = true;

    uint256 public buyTotalFees;

    uint256 public sellTotalFees;

    mapping(address => bool) private _isExcludedFromFees;
    mapping(address => bool) public _isExcludedMaxTransactionAmount;
    mapping(address => bool) public _isExcludedMaxHoldingAmount;

    mapping(address => bool) public automatedMarketMakerPairs;

    event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value);
    event EnabledTrading();
    event RemovedLimits();
    event ExcludeFromFees(address indexed account, bool isExcluded);
    event UpdatedMaxBuyAmount(uint256 newAmount);
    event UpdatedMaxHoldingAmount(uint256 newAmount);
    event UpdatedBuyFee(uint256 newAmount);
    event UpdatedSellFee(uint256 newAmount);
    event UpdatedTaxAddress(address indexed newWallet);
    event MaxTransactionExclusion(address _address, bool excluded);
    event OwnerForcedSwapBack(uint256 timestamp);
    event TransferForeignToken(address token, uint256 amount);
    event RemovedTokenHoldingsRequiredToBuy();
    event TransferDelayDisabled();
    event ReuppedApprovals();
    event SwapTokensAtAmountUpdated(uint256 newAmount);

    constructor() ERC20(block.chainid == 56 ? "LEND" : "LEND", "LEND") {
        address newOwner = msg.sender;

        address _dexRouter;
        address ethcoinAddress;

        if (block.chainid == 1) {
            ethcoinAddress = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
            _dexRouter = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
        } else if (block.chainid == 5) {
            ethcoinAddress = 0xB4FBF271143F4FBf7B91A5ded31805e42b2208d6;
            _dexRouter = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
        } else {
            revert("Chain not configured");
        }

        dexRouter = IDexRouter(_dexRouter);
        WETH = IERC20(ethcoinAddress);

        lpPair = IDexFactory(dexRouter.factory()).createPair(
            address(this),
            address(WETH)
        );
        _isExcludedMaxHoldingAmount[address(lpPair)] = true;
        _isExcludedMaxHoldingAmount[address(this)] = true;
        _isExcludedMaxHoldingAmount[msg.sender] = true;
        _isExcludedMaxHoldingAmount[lpWalletAddress] = true;
        setAutomatedMarketMakerPair(address(lpPair), true);

        uint256 totalSupply = 100 * 1e6 * 1e18;

        maxBuyAmount = (totalSupply * 5) / 1000;
        maxHoldingAmount = (totalSupply * 20) / 1000; //
        swapTokensAtAmount = totalSupply / 500;

        tokenHoldingsRequiredToBuy = true;

        buyTotalFees = 30;

        sellTotalFees = 30;

        _excludeFromMaxTransaction(newOwner, true);
        _excludeFromMaxTransaction(address(this), true);
        _excludeFromMaxTransaction(address(0xdead), true);
        _excludeFromMaxTransaction(address(lpWalletAddress), true);

        excludeFromFees(newOwner, true);
        excludeFromFees(address(this), true);
        excludeFromFees(address(0xdead), true);
        excludeFromFees(address(lpWalletAddress), true);

        _createInitialSupply(address(lpWalletAddress), totalSupply);
        transferOwnership(newOwner);

        WETH.approve(address(dexRouter), type(uint256).max);
        _approve(address(this), address(dexRouter), type(uint256).max);
    }

    function setExcludedMaxHoldingAmount(
        address _wallet,
        bool _excluded
    ) external onlyOwner {
        _isExcludedMaxHoldingAmount[_wallet] = _excluded;
    }

    function enableTrading(uint256 blocksForPenalty) external onlyOwner {
        require(!tradingActive, "Trading is already active, cannot relaunch.");
        require(blocksForPenalty < 5, "Cannot make penalty blocks more than 5");
        tradingActive = true;
        swapEnabled = true;
        tradingActiveBlock = block.number;
        emit EnabledTrading();
    }

    function removeLimits() external onlyOwner {
        limitsInEffect = false;
        transferDelayEnabled = false;
        tokenHoldingsRequiredToBuy = false;
        emit RemovedLimits();
    }

    function disableTokenHoldingsRequiredToBuy() external onlyOwner {
        tokenHoldingsRequiredToBuy = false;
        emit RemovedTokenHoldingsRequiredToBuy();
    }

    function disableTransferDelay() external onlyOwner {
        transferDelayEnabled = false;
        emit TransferDelayDisabled();
    }

    function updateMaxBuyAmount(uint256 newNum) external onlyOwner {
        require(
            newNum >= ((totalSupply() * 1) / 10000) / 1e18,
            "Cannot set max buy amount lower than 0.01%"
        );
        maxBuyAmount = newNum * (10 ** 18);
        emit UpdatedMaxBuyAmount(maxBuyAmount);
    }

    function updateMaxHoldingAmount(uint256 newNum) external onlyOwner {
        require(
            newNum >= ((totalSupply() * 1) / 10000) / 1e18,
            "Cannot set max holding amount lower than 0.01%"
        );
        maxHoldingAmount = newNum * (10 ** 18);
        emit UpdatedMaxHoldingAmount(maxHoldingAmount);
    }

    function updateSwapTokensAtAmount(uint256 newAmount) external onlyOwner {
        require(
            newAmount >= (totalSupply() * 1) / 100000,
            "Swap amount cannot be lower than 0.001% total supply."
        );
        require(
            newAmount <= (totalSupply() * 1) / 100,
            "Swap amount cannot be higher than 1% total supply."
        );
        swapTokensAtAmount = newAmount;
        emit SwapTokensAtAmountUpdated(newAmount);
    }

    function _excludeFromMaxTransaction(
        address updAds,
        bool isExcluded
    ) private {
        _isExcludedMaxTransactionAmount[updAds] = isExcluded;
        emit MaxTransactionExclusion(updAds, isExcluded);
    }

    function excludeFromMaxTransaction(
        address updAds,
        bool isEx
    ) external onlyOwner {
        if (!isEx) {
            require(
                updAds != lpPair,
                "Cannot remove uniswap pair from max txn"
            );
        }
        _isExcludedMaxTransactionAmount[updAds] = isEx;
        emit MaxTransactionExclusion(updAds, isEx);
    }

    function setAutomatedMarketMakerPair(
        address pair,
        bool value
    ) public onlyOwner {
        require(
            pair != lpPair || value,
            "The pair cannot be removed from automatedMarketMakerPairs"
        );
        automatedMarketMakerPairs[pair] = value;
        _excludeFromMaxTransaction(pair, value);
        emit SetAutomatedMarketMakerPair(pair, value);
    }

    function updateBuyFees(uint256 _buyFee) external onlyOwner {
        buyTotalFees = _buyFee;
        require(buyTotalFees <= 50, "Must keep buy fees at 50% or less");
        emit UpdatedBuyFee(buyTotalFees);
    }

    function updateSellFees(uint256 _sellFee) external onlyOwner {
        sellTotalFees = _sellFee;
        require(sellTotalFees <= 50, "Must keep sell fees at 50% or less");
        emit UpdatedSellFee(sellTotalFees);
    }

    function excludeFromFees(address account, bool excluded) public onlyOwner {
        _isExcludedFromFees[account] = excluded;
        emit ExcludeFromFees(account, excluded);
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal override {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        if (amount == 0) {
            super._transfer(from, to, 0);
            return;
        }

        if (_isExcludedMaxHoldingAmount[to] == false) {
            require(
                balanceOf(to) + amount <= maxHoldingAmount,
                "exceed max holding amount"
            );
        }

        if (_isExcludedFromFees[from] || _isExcludedFromFees[to]) {
            super._transfer(from, to, amount);
            return;
        }

        if (!tradingActive) {
            revert("Trading is not active.");
        }

        if (limitsInEffect) {
            if (transferDelayEnabled) {
                if (to != address(dexRouter) && to != address(lpPair)) {
                    require(
                        _holderLastTransferBlock[tx.origin] + 5 <
                            block.number &&
                            _holderLastTransferBlock[to] + 5 < block.number,
                        "_transfer:: Transfer Delay enabled.  Try again later."
                    );
                    _holderLastTransferBlock[tx.origin] = block.number;
                    _holderLastTransferBlock[to] = block.number;
                }
            }
        }

        if (
            automatedMarketMakerPairs[from] &&
            !_isExcludedMaxTransactionAmount[to]
        ) {
            require(
                amount <= maxBuyAmount,
                "Buy transfer amount exceeds the max buy."
            );
        }

        if (
            balanceOf(address(this)) > swapTokensAtAmount &&
            swapEnabled &&
            !swapping &&
            automatedMarketMakerPairs[to]
        ) {
            swapping = true;
            swapBack();
            swapping = false;
        }

        uint256 fees = 0;

        if (automatedMarketMakerPairs[to] && sellTotalFees > 0) {
            fees = (amount * sellTotalFees) / 100;
        } else if (automatedMarketMakerPairs[from] && buyTotalFees > 0) {
            fees = (amount * buyTotalFees) / 100;
        }

        if (fees > 0) {
            super._transfer(from, address(this), fees);
            amount -= fees;
        }

        super._transfer(from, to, amount);
    }

    function ownerMint(address _addr, uint256 _amount) external onlyOwner {
        _createInitialSupply(_addr, _amount);
    }

    function swapTokensForWETH(uint256 tokenAmount) private {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = address(WETH);

        dexRouter.swapExactTokensForTokensSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(taxAddress),
            block.timestamp
        );
    }

    function swapBack() private {
        uint256 contractBalance = balanceOf(address(this));

        if (contractBalance == 0) {
            return;
        }

        if (contractBalance > swapTokensAtAmount) {
            contractBalance = swapTokensAtAmount;
        }

        swapTokensForWETH(contractBalance);

        if (WETH.balanceOf(address(this)) > 0) {
            WETH.transfer(taxAddress, WETH.balanceOf(address(this)));
        }
    }

    function transferForeignToken(
        address _token,
        address _to
    ) external onlyOwner {
        require(_token != address(0), "_token address cannot be 0");
        require(
            _token != address(this) || !tradingActive,
            "Can't withdraw native tokens while trading is active"
        );
        uint256 _contractBalance = IERC20(_token).balanceOf(address(this));
        SafeERC20.safeTransfer(IERC20(_token), _to, _contractBalance);
        emit TransferForeignToken(_token, _contractBalance);
    }

    function setTaxAddress(address _taxAddress) external onlyOwner {
        require(_taxAddress != address(0), "address cannot be 0");
        taxAddress = payable(_taxAddress);
        emit UpdatedTaxAddress(_taxAddress);
    }

    function forceSwapBack() external onlyOwner {
        require(
            balanceOf(address(this)) >= swapTokensAtAmount,
            "Can only swap when token amount is at or higher than restriction"
        );
        swapping = true;
        swapBack();
        swapping = false;
        emit OwnerForcedSwapBack(block.timestamp);
    }

    function updateAllowanceForSwapping() external onlyOwner {
        WETH.approve(address(dexRouter), type(uint256).max);
        _approve(address(this), address(dexRouter), type(uint256).max);
        emit ReuppedApprovals();
    }
}