// File: src/HODLToken.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;
// HODL is a decentralised reserve currency
// Telegram: https://t.me/StakerTechPortal
// Website: https://staker.tech
// Twitter: https://twitter.com/StakerTechHODL
// Docs: https://docs.staker.tech
//

import {ERC20} from "solmate/tokens/ERC20.sol";
import {WETH} from "solmate/tokens/WETH.sol";
import {Owned} from "solmate/auth/Owned.sol";
import {SafeTransferLib} from "solmate/utils/SafeTransferLib.sol";
import {IUniswapV2Factory} from "./interfaces/IUniswapV2Factory.sol";
import {IUniswapV2Router} from "./interfaces/IUniswapV2Router.sol";

contract HODLToken is ERC20, Owned {
    using SafeTransferLib for ERC20;
    struct User {
        bool isBlacklisted;
        bool isAutomatedMarketMaker;
        bool isExcludedFromFees;
        bool isExcludedFromMaxTransactionAmount;
    }

    struct Fees {
        uint8 buy;
        uint8 sell;
        uint8 liquidity;
        uint8 development;
        uint8 staking;
    }

    struct Settings {
        bool limitsInEffect;
        bool swapEnabled;
        bool blacklistRenounced;
        bool feeChangeRenounced;
        bool tradingActive;
        /// @dev Upon enabling trading, record the end block for bot protection fee
        /// @dev This fee is a 90% fee that is reduced by 5% every block for 18 blocks.
        uint216 endBlock;
    }

    uint256 public constant MAX_SUPPLY = 10_000_000 * 1e18;
    uint256 public constant MIN_SWAP_AMOUNT = MAX_SUPPLY / 100_000; // 0.001%
    uint256 public constant MAX_SWAP_AMOUNT = (MAX_SUPPLY * 5) / 1_000; // 0.5%
    uint256 public exitTaxRate;

    IUniswapV2Router public immutable uniswapV2Router;
    address public immutable uniswapV2Pair;
    address public immutable developmentWallet;
    address public stakingAddress;

    uint256 public maxTransactionAmount;
    uint256 public swapTokensAtAmount;
    uint256 public maxWallet;
    uint256 public tokensForBotProtection;

    Fees public feeAmounts;

    bool private _swapping;

    Settings private settings =
        Settings({
            limitsInEffect: true,
            swapEnabled: true,
            blacklistRenounced: false,
            feeChangeRenounced: false,
            tradingActive: false,
            endBlock: uint216(0)
        });

    mapping(address => User) private _users;
    mapping(address => uint256) private _lastBuyTimestamp;
    address private wethAddress;

    event ExcludeFromFees(address indexed account, bool isExcluded);
    event ExcludeFromMaxTransaction(address indexed account, bool isExcluded);
    event FailedSwapBackTransfer(address indexed destination, uint256 amount);
    event MaxTransactionAmountUpdated(uint256 newAmount, uint256 oldAmount);
    event SetAutomatedMarketMakerPair(address indexed pair, bool value);
    event SwapAndLiquify(uint256 tokensSwapped, uint256 ethReceived);
    event TransferToStaking(uint256 amount);
    event SwapTokensAtAmountUpdated(uint256 newAmount, uint256 oldAmount);

    error HODL__BlacklistModificationDisabled();
    error HODL__BuyAmountGreaterThanMax();
    error HODL__CannotBlacklistLPPair();
    error HODL__CannotBlacklistRouter();
    error HODL__CannotRemovePairFromAMMs();
    error HODL__CannotTransferFromAddressZero();
    error HODL__CannotTransferToAddressZero();
    error HODL__ErrorWithdrawingEth();
    error HODL__FeeChangeRenounced();
    error HODL__MaxFeeFivePercent();
    error HODL__MaxTransactionTooLow();
    error HODL__MaxWalletAmountExceeded();
    error HODL__MaxWalletAmountTooLow();
    error HODL__OnlyOwner();
    error HODL__ReceiverBlacklisted();
    error HODL__ReceiverCannotBeAddressZero();
    error HODL__SellAmountGreaterThanMax();
    error HODL__SenderBlacklisted();
    error HODL__StuckEthWithdrawError();
    error HODL__SwapAmountGreaterThanMaximum();
    error HODL__SwapAmountLowerThanMinimum();
    error HODL__TokenAddressCannotBeAddressZero();
    error HODL__TradingNotActive();

    constructor(
        address routerAddress,
        address devWallet,
        uint256 _exitTaxRate
    ) ERC20("HODL", "HODL", 18) Owned(msg.sender) {
        developmentWallet = devWallet;
        exitTaxRate = _exitTaxRate;
        IUniswapV2Router _uniswapV2Router = IUniswapV2Router(routerAddress);
        uniswapV2Router = _uniswapV2Router;
        wethAddress = uniswapV2Router.WETH();
        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());

        maxTransactionAmount = MAX_SUPPLY / 200; // 0.5%
        maxWallet = MAX_SUPPLY / 100; // 1%
        swapTokensAtAmount = (MAX_SUPPLY * 5) / 10_000; // 0.05%
        feeAmounts = Fees({
            buy: 5,
            sell: 5,
            liquidity: 20,
            development: 30,
            staking: 50
        });

        _users[msg.sender] = User({
            isExcludedFromFees: true,
            isExcludedFromMaxTransactionAmount: true,
            isAutomatedMarketMaker: false,
            isBlacklisted: false
        });

        _users[address(this)] = User({
            isExcludedFromFees: true,
            isExcludedFromMaxTransactionAmount: true,
            isAutomatedMarketMaker: false,
            isBlacklisted: false
        });

        _users[address(uniswapV2Router)] = User({
            isExcludedFromMaxTransactionAmount: true,
            isAutomatedMarketMaker: false,
            isExcludedFromFees: false,
            isBlacklisted: false
        });

        _users[address(uniswapV2Pair)] = User({
            isExcludedFromMaxTransactionAmount: true,
            isAutomatedMarketMaker: true,
            isExcludedFromFees: false,
            isBlacklisted: false
        });

        _mint(msg.sender, MAX_SUPPLY);
        _approve(address(uniswapV2Router), type(uint256).max);
        _lastBuyTimestamp[devWallet] = block.timestamp;
    }

    receive() external payable {}

    function _requireIsOwner() internal view {
        require(msg.sender == owner, "!owner");
    }

    function burn(address from, uint256 amount) external {
        _burn(from, amount);
    }

    function setStakingAddress(address _staking) external {
        _requireIsOwner();
        stakingAddress = _staking;
    }

    function updateExitTaxRate(uint256 _exitTaxRate) external {
        _requireIsOwner();
        exitTaxRate = _exitTaxRate;
    }

    function updateFees(Fees memory newFees) external {
        _requireIsOwner();
        feeAmounts = newFees;
    }

    function enableTrading() external {
        _requireIsOwner();
        settings.endBlock = uint216(block.number) + 20;
        settings.tradingActive = true;
    }

    function removeLimits() external {
        _requireIsOwner();
        settings.limitsInEffect = false;
    }

    // change the minimum amount of tokens to sell from fees
    function updateSwapTokensAtAmount(uint256 newAmount) external {
        _requireIsOwner();
        if (newAmount < MIN_SWAP_AMOUNT) {
            revert HODL__SwapAmountLowerThanMinimum();
        }
        if (newAmount > MAX_SWAP_AMOUNT) {
            revert HODL__SwapAmountGreaterThanMaximum();
        }
        uint256 oldSwapAmount = swapTokensAtAmount;
        swapTokensAtAmount = newAmount;
        emit SwapTokensAtAmountUpdated(newAmount, oldSwapAmount);
    }

    function updateMaxTransactionAmount(uint256 newAmount) external {
        _requireIsOwner();
        if (newAmount < (MAX_SUPPLY * 5) / 1000) {
            revert HODL__MaxTransactionTooLow();
        }
        uint256 oldMaxTransactionAmount = maxTransactionAmount;
        maxTransactionAmount = newAmount;
        emit MaxTransactionAmountUpdated(newAmount, oldMaxTransactionAmount);
    }

    function excludeFromFees(address account, bool excluded) external {
        _requireIsOwner();
        _users[account].isExcludedFromFees = excluded;
        emit ExcludeFromFees(account, excluded);
    }

    function excludeFromMaxTransaction(
        address account,
        bool isExcluded
    ) external {
        _requireIsOwner();
        _users[account].isExcludedFromMaxTransactionAmount = isExcluded;
        emit ExcludeFromMaxTransaction(account, isExcluded);
    }

    function setAutomatedMarketMakerPair(address pair, bool value) external {
        _requireIsOwner();
        if (pair == uniswapV2Pair) {
            revert HODL__CannotRemovePairFromAMMs();
        }

        _users[pair].isAutomatedMarketMaker = value;
        emit SetAutomatedMarketMakerPair(pair, value);
    }

    function renounceBlacklist() external {
        _requireIsOwner();
        settings.blacklistRenounced = true;
    }

    function blacklist(address account) external {
        _requireIsOwner();
        if (settings.blacklistRenounced) {
            revert HODL__BlacklistModificationDisabled();
        }
        if (account == uniswapV2Pair) {
            revert HODL__CannotBlacklistLPPair();
        }
        if (account == address(uniswapV2Router)) {
            revert HODL__CannotBlacklistRouter();
        }
        _users[account].isBlacklisted = true;
    }

    // @dev unblacklist address; not affected by blacklistRenounced incase team wants to unblacklist v3 pools down the
    function unblacklist(address account) external {
        _requireIsOwner();
        _users[account].isBlacklisted = false;
    }

    function isExcludedFromFees(address account) external view returns (bool) {
        return _users[account].isExcludedFromFees;
    }

    function isExcludedFromMaxTransactionAmount(
        address account
    ) external view returns (bool) {
        return _users[account].isExcludedFromMaxTransactionAmount;
    }

    function isAutomatedMarketMakerPair(
        address pair
    ) external view returns (bool) {
        return _users[pair].isAutomatedMarketMaker;
    }

    function isBlacklisted(address account) external view returns (bool) {
        return _users[account].isBlacklisted;
    }

    function isSwapEnabled() external view returns (bool) {
        return settings.swapEnabled;
    }

    function isBlacklistRenounced() external view returns (bool) {
        return settings.blacklistRenounced;
    }

    function isFeeChangeRenounced() external view returns (bool) {
        return settings.feeChangeRenounced;
    }

    function isTradingActive() external view returns (bool) {
        return settings.tradingActive;
    }

    function isLimitInEffect() external view returns (bool) {
        return settings.limitsInEffect;
    }

    function transfer(
        address to,
        uint256 amount
    ) public override returns (bool) {
        _transfer(msg.sender, to, amount);
        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public override returns (bool) {
        uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.
        if (allowed != type(uint256).max) {
            allowance[from][msg.sender] = allowed - amount;
        }
        _transfer(from, to, amount);
        return true;
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal returns (bool) {
        User memory fromData = _users[from];
        User memory toData = _users[to];
        Settings memory settingCache = settings;

        if (!settingCache.tradingActive) {
            if (!fromData.isExcludedFromFees) {
                if (!toData.isExcludedFromFees) {
                    revert HODL__TradingNotActive();
                }
            }
        }

        // Apply blacklist protection
        if (fromData.isBlacklisted) {
            revert HODL__SenderBlacklisted();
        }
        if (toData.isBlacklisted) {
            revert HODL__ReceiverBlacklisted();
        }

        // If zero amount, continue
        if (amount == 0) {
            return true;
        }

        bool excludedFromFees = fromData.isExcludedFromFees ||
            toData.isExcludedFromFees;

        // Cache transaction type for reference.
        // 1 = Buy
        // 2 = Sell
        // 3 = Transfer
        uint8 txType = 3;

        if (fromData.isAutomatedMarketMaker) {
            // Buys originate from the AMM pair
            txType = 1;
        } else if (toData.isAutomatedMarketMaker) {
            // Sells send funds to AMM pair
            txType = 2;
        }

        if (!_swapping) {
            if (settingCache.limitsInEffect) {
                //when buy
                if (txType == 1 && !toData.isExcludedFromMaxTransactionAmount) {
                    if (amount > maxTransactionAmount) {
                        revert HODL__BuyAmountGreaterThanMax();
                    }
                    if (amount + this.balanceOf(to) > maxWallet) {
                        revert HODL__MaxWalletAmountExceeded();
                    }
                }
                //when sell
                else if (
                    txType == 2 && !fromData.isExcludedFromMaxTransactionAmount
                ) {
                    if (amount > maxTransactionAmount) {
                        revert HODL__SellAmountGreaterThanMax();
                    }
                } else if (!toData.isExcludedFromMaxTransactionAmount) {
                    if (amount + this.balanceOf(to) > maxWallet) {
                        revert HODL__MaxWalletAmountExceeded();
                    }
                }
            }

            if (settingCache.swapEnabled) {
                // Only sells will trigger the fee swap
                if (txType == 2) {
                    if (this.balanceOf(address(this)) >= swapTokensAtAmount) {
                        _swapping = true;
                        _swapBack();
                        _swapping = false;
                    }
                }
            }
        }

        if (txType < 3) {
            bool takeFee = !_swapping;

            // if any account belongs to _isExcludedFromFee account then remove the fee
            if (excludedFromFees) {
                takeFee = false;
            }
            uint256 fees = 0;
            // only take fees on buys/sells, do not take on wallet transfers
            if (takeFee) {
                Fees memory feeCache = feeAmounts;
                // on sell

                if (block.number < settingCache.endBlock) {
                    uint256 blocksLeft = settingCache.endBlock - block.number;
                    uint256 botFeeMultiplier = 95;

                    // Apply sniper protection - first 18 blocks have a fee reduced 5% each block.
                    if (blocksLeft < 19) {
                        botFeeMultiplier -= (5 * (19 - blocksLeft));
                    }
                    uint256 botFee = (amount * botFeeMultiplier) / 100;
                    _doTransfer(from, owner, fees);
                    amount -= botFee;
                    tokensForBotProtection += botFee;
                } else {
                    if (txType == 2) {
                        if (feeCache.sell > 0) {
                            uint256 feePercentage = getExitTax(from);
                            fees = (amount * feePercentage) / 100;
                        }
                    } else if (txType == 1) {
                        if (feeCache.buy > 0) {
                            fees = (amount * feeCache.buy) / 100;
                            _lastBuyTimestamp[from] = block.timestamp;
                        }
                    }
                }

                amount -= fees;

                if (fees > 0) {
                    _doTransfer(from, address(this), fees);
                }
            }
        }

        // Update last buy timestamp when to anotheraddress
        if (txType == 3) {
            if (_lastBuyTimestamp[from] > _lastBuyTimestamp[to]) {
                _lastBuyTimestamp[to] = _lastBuyTimestamp[from];
            }
        }

        _doTransfer(from, to, amount);

        return true;
    }

    function getExitTax(address from) public view returns (uint256) {
        // Scale exit tax liearly from exitTaxRate% to 5%
        uint256 lastBuy = _lastBuyTimestamp[from];
        if (lastBuy == 0) {
            return exitTaxRate;
        }
        uint256 timeSinceLastBuy = block.timestamp - lastBuy;
        uint256 percentageOfDay = (timeSinceLastBuy * 1000) / 8 hours;
        if (percentageOfDay >= 1000) {
            return 5;
        }
        uint256 exitTax = exitTaxRate -
            ((exitTaxRate * percentageOfDay) / 1000);
        return exitTax;
    }

    function getLastBuyTimestamp(address from) public view returns (uint256) {
        return _lastBuyTimestamp[from];
    }

    function _swapTokensForEth(uint256 tokenAmount) internal {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();

        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }

    function _addLiquidity(uint256 tokenAmount, uint256 ethAmount) internal {
        uniswapV2Router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0, // slippage is unavoidable
            0, // slippage is unavoidable
            developmentWallet,
            block.timestamp
        );
    }

    function _doTransfer(
        address from,
        address to,
        uint256 amount
    ) internal returns (bool) {
        balanceOf[from] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(from, to, amount);

        return true;
    }

    function _swapBack() internal {
        // Cache values
        uint256 contractBalance = this.balanceOf(address(this));
        Fees memory feeCache = feeAmounts;

        if (contractBalance == 0) {
            return;
        }

        // Prevent too many tokens from being swapped
        uint256 maxAmount = swapTokensAtAmount * 20;
        if (contractBalance > maxAmount) {
            contractBalance = maxAmount;
        }

        uint256 liquidityAmount = (contractBalance * feeCache.liquidity) / 100;

        // Halve the amount of liquidity tokens
        uint256 liquidityTokens = liquidityAmount - (liquidityAmount / 2);

        uint256 initialETHBalance = address(this).balance;
        _swapTokensForEth(liquidityTokens);
        uint256 ethForLiquidity = address(this).balance - initialETHBalance;

        if (liquidityTokens > 0 && ethForLiquidity > 0) {
            _addLiquidity(liquidityTokens, ethForLiquidity);
            emit SwapAndLiquify(liquidityTokens, ethForLiquidity);
        }

        uint256 amountToSwapForETH = contractBalance - liquidityAmount;
        _swapTokensForEth(amountToSwapForETH);

        uint256 contractEthAmount = address(this).balance;
        uint256 initialTotalEth = contractEthAmount + (ethForLiquidity * 2);

        uint256 developmentEthAmount = (initialTotalEth *
            feeCache.development) / 100;
        (bool success, ) = address(developmentWallet).call{
            value: developmentEthAmount
        }("");
        require(success);

        uint256 stakingAmount = contractEthAmount - developmentEthAmount;
        WETH(payable(wethAddress)).deposit{value: stakingAmount}();
        ERC20(wethAddress).safeTransfer(stakingAddress, stakingAmount);
        emit TransferToStaking(stakingAmount);
    }

    function _approve(address spender, uint256 amount) internal onlyOwner {
        allowance[address(this)][spender] = amount;
        emit Approval(address(this), spender, amount);
    }
}

// File: lib/solmate/src/tokens/ERC20.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Modern and gas efficient ERC20 + EIP-2612 implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol)
/// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it.
abstract contract ERC20 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event Transfer(address indexed from, address indexed to, uint256 amount);

    event Approval(address indexed owner, address indexed spender, uint256 amount);

    /*//////////////////////////////////////////////////////////////
                            METADATA STORAGE
    //////////////////////////////////////////////////////////////*/

    string public name;

    string public symbol;

    uint8 public immutable decimals;

    /*//////////////////////////////////////////////////////////////
                              ERC20 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 public totalSupply;

    mapping(address => uint256) public balanceOf;

    mapping(address => mapping(address => uint256)) public allowance;

    /*//////////////////////////////////////////////////////////////
                            EIP-2612 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 internal immutable INITIAL_CHAIN_ID;

    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;

    mapping(address => uint256) public nonces;

    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;

        INITIAL_CHAIN_ID = block.chainid;
        INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();
    }

    /*//////////////////////////////////////////////////////////////
                               ERC20 LOGIC
    //////////////////////////////////////////////////////////////*/

    function approve(address spender, uint256 amount) public virtual returns (bool) {
        allowance[msg.sender][spender] = amount;

        emit Approval(msg.sender, spender, amount);

        return true;
    }

    function transfer(address to, uint256 amount) public virtual returns (bool) {
        balanceOf[msg.sender] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(msg.sender, to, amount);

        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual returns (bool) {
        uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.

        if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;

        balanceOf[from] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(from, to, amount);

        return true;
    }

    /*//////////////////////////////////////////////////////////////
                             EIP-2612 LOGIC
    //////////////////////////////////////////////////////////////*/

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual {
        require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");

        // Unchecked because the only math done is incrementing
        // the owner's nonce which cannot realistically overflow.
        unchecked {
            address recoveredAddress = ecrecover(
                keccak256(
                    abi.encodePacked(
                        "\x19\x01",
                        DOMAIN_SEPARATOR(),
                        keccak256(
                            abi.encode(
                                keccak256(
                                    "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
                                ),
                                owner,
                                spender,
                                value,
                                nonces[owner]++,
                                deadline
                            )
                        )
                    )
                ),
                v,
                r,
                s
            );

            require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER");

            allowance[recoveredAddress][spender] = value;
        }

        emit Approval(owner, spender, value);
    }

    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator();
    }

    function computeDomainSeparator() internal view virtual returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                    keccak256(bytes(name)),
                    keccak256("1"),
                    block.chainid,
                    address(this)
                )
            );
    }

    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function _mint(address to, uint256 amount) internal virtual {
        totalSupply += amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(address(0), to, amount);
    }

    function _burn(address from, uint256 amount) internal virtual {
        balanceOf[from] -= amount;

        // Cannot underflow because a user's balance
        // will never be larger than the total supply.
        unchecked {
            totalSupply -= amount;
        }

        emit Transfer(from, address(0), amount);
    }
}

// File: lib/solmate/src/tokens/WETH.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

import {ERC20} from "./ERC20.sol";

import {SafeTransferLib} from "../utils/SafeTransferLib.sol";

/// @notice Minimalist and modern Wrapped Ether implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/WETH.sol)
/// @author Inspired by WETH9 (https://github.com/dapphub/ds-weth/blob/master/src/weth9.sol)
contract WETH is ERC20("Wrapped Ether", "WETH", 18) {
    using SafeTransferLib for address;

    event Deposit(address indexed from, uint256 amount);

    event Withdrawal(address indexed to, uint256 amount);

    function deposit() public payable virtual {
        _mint(msg.sender, msg.value);

        emit Deposit(msg.sender, msg.value);
    }

    function withdraw(uint256 amount) public virtual {
        _burn(msg.sender, amount);

        emit Withdrawal(msg.sender, amount);

        msg.sender.safeTransferETH(amount);
    }

    receive() external payable virtual {
        deposit();
    }
}

// File: lib/solmate/src/auth/Owned.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Simple single owner authorization mixin.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/auth/Owned.sol)
abstract contract Owned {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event OwnershipTransferred(address indexed user, address indexed newOwner);

    /*//////////////////////////////////////////////////////////////
                            OWNERSHIP STORAGE
    //////////////////////////////////////////////////////////////*/

    address public owner;

    modifier onlyOwner() virtual {
        require(msg.sender == owner, "UNAUTHORIZED");

        _;
    }

    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(address _owner) {
        owner = _owner;

        emit OwnershipTransferred(address(0), _owner);
    }

    /*//////////////////////////////////////////////////////////////
                             OWNERSHIP LOGIC
    //////////////////////////////////////////////////////////////*/

    function transferOwnership(address newOwner) public virtual onlyOwner {
        owner = newOwner;

        emit OwnershipTransferred(msg.sender, newOwner);
    }
}

// File: lib/solmate/src/utils/SafeTransferLib.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

import {ERC20} from "../tokens/ERC20.sol";

/// @notice Safe ETH and ERC20 transfer library that gracefully handles missing return values.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/SafeTransferLib.sol)
/// @dev Use with caution! Some functions in this library knowingly create dirty bits at the destination of the free memory pointer.
/// @dev Note that none of the functions in this library check that a token has code at all! That responsibility is delegated to the caller.
library SafeTransferLib {
    /*//////////////////////////////////////////////////////////////
                             ETH OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferETH(address to, uint256 amount) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Transfer the ETH and store if it succeeded or not.
            success := call(gas(), to, amount, 0, 0, 0, 0)
        }

        require(success, "ETH_TRANSFER_FAILED");
    }

    /*//////////////////////////////////////////////////////////////
                            ERC20 OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferFrom(
        ERC20 token,
        address from,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0x23b872dd00000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), and(from, 0xffffffffffffffffffffffffffffffffffffffff)) // Append and mask the "from" argument.
            mstore(add(freeMemoryPointer, 36), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Append and mask the "to" argument.
            mstore(add(freeMemoryPointer, 68), amount) // Append the "amount" argument. Masking not required as it's a full 32 byte type.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 100 because the length of our calldata totals up like so: 4 + 32 * 3.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 100, 0, 32)
            )
        }

        require(success, "TRANSFER_FROM_FAILED");
    }

    function safeTransfer(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0xa9059cbb00000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Append and mask the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument. Masking not required as it's a full 32 byte type.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "TRANSFER_FAILED");
    }

    function safeApprove(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0x095ea7b300000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Append and mask the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument. Masking not required as it's a full 32 byte type.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "APPROVE_FAILED");
    }
}

// File: src/interfaces/IUniswapV2Factory.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

interface IUniswapV2Factory {
    function createPair(
        address tokenA,
        address tokenB
    ) external returns (address pair);
}

// File: src/interfaces/IUniswapV2Router.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

interface IUniswapV2Router {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    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 removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);

    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;
}