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// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

import {IERC20} from "@openzeppelin-4/contracts/interfaces/IERC20.sol";
import {IERC20Metadata} from "@openzeppelin-4/contracts/interfaces/IERC20Metadata.sol";
import {SafeERC20} from "@openzeppelin-4/contracts/token/ERC20/utils/SafeERC20.sol";
import {IRouter} from "../interfaces/velodrome-v2/IRouter.sol";
import {IPool} from "../interfaces/velodrome-v2/IPool.sol";
import {IBeefyVault} from "./zapInterfaces/IBeefyVault.sol";
import {IWETH} from "./zapInterfaces/IWETH.sol";
import {Babylonian} from "./libs/Babylonian.sol";
import {ZapErrors} from "./errors/ZapErrors.sol";

contract BeefyVelodromeV2Zap is ZapErrors {
    using SafeERC20 for IERC20;
    using SafeERC20 for IBeefyVault;

    IRouter public immutable router;
    address public immutable WETH;
    uint256 private constant minimumAmount = 1000;

    constructor(address _router, address _WETH) {
        router = IRouter(_router);
        WETH = _WETH;

        if(WETH != router.weth()) revert NotWETH();
    }

    receive() external payable {
        assert(msg.sender == WETH);
    }

    function beefInETH(address beefyVault, uint256 tokenAmountOutMin) external payable {
        if(msg.value < minimumAmount) revert InsignificantAmount();

        IWETH(WETH).deposit{value: msg.value}();

        _swapAndStake(beefyVault, tokenAmountOutMin, WETH);
    }

    function beefIn(address beefyVault, uint256 tokenAmountOutMin, address tokenIn, uint256 tokenInAmount) external {
        if(tokenInAmount < minimumAmount) revert InsignificantAmount();

        IERC20(tokenIn).safeTransferFrom(msg.sender, address(this), tokenInAmount);

        _swapAndStake(beefyVault, tokenAmountOutMin, tokenIn);
    }

    function beefOut(address beefyVault, uint256 withdrawAmount) external {
        (IBeefyVault vault, IPool pair) = _getVaultPair(beefyVault);

        IERC20(beefyVault).safeTransferFrom(msg.sender, address(this), withdrawAmount);
        vault.withdraw(withdrawAmount);

        if (pair.token0() != WETH && pair.token1() != WETH) {
            return _removeLiquidity(address(pair), msg.sender);
        }

        _removeLiquidity(address(pair), address(this));

        address[] memory tokens = new address[](2);
        tokens[0] = pair.token0();
        tokens[1] = pair.token1();

        _returnAssets(tokens);
    }

    function beefOutAndSwap(address beefyVault, uint256 withdrawAmount, address desiredToken, uint256 desiredTokenOutMin) external {
        (IBeefyVault vault, IPool pair) = _getVaultPair(beefyVault);
        address token0 = pair.token0();
        address token1 = pair.token1();
        if(token0 != desiredToken && token1 != desiredToken) revert WrongToken();

        vault.safeTransferFrom(msg.sender, address(this), withdrawAmount);
        vault.withdraw(withdrawAmount);
        _removeLiquidity(address(pair), address(this));

        address swapToken = token1 == desiredToken ? token0 : token1;
        address[] memory path = new address[](2);
        path[0] = swapToken;
        path[1] = desiredToken;

        _approveTokenIfNeeded(path[0], address(router));
        _swapExactTokensForTokensSimple(IERC20(swapToken).balanceOf(address(this)), desiredTokenOutMin, path[0], path[1], pair.stable(), pair.factory(), address(this), block.timestamp);

        _returnAssets(path);
    }

    function _swapExactTokensForTokensSimple(
        uint amountIn,
        uint amountOutMin,
        address tokenFrom,
        address tokenTo,
        bool stable,
        address factory,
        address to,
        uint deadline
    ) private returns (uint256[] memory amounts) {
        IRouter.Route[] memory routes = new IRouter.Route[](1);
        routes[0] = IRouter.Route({
            from: tokenFrom,
            to: tokenTo,
            stable: stable,
            factory: factory
        });
        amounts = router.swapExactTokensForTokens(amountIn, amountOutMin, routes, to, deadline);
    }

    function _removeLiquidity(address pair, address to) private {
        IERC20(pair).safeTransfer(pair, IERC20(pair).balanceOf(address(this)));
        (uint256 amount0, uint256 amount1) = IPool(pair).burn(to);

        if (amount0 < minimumAmount) revert InsufficientAmount();
        if (amount1 < minimumAmount) revert InsufficientAmount();
    }

    function _getVaultPair(address beefyVault) private pure returns (IBeefyVault vault, IPool pair) {
        vault = IBeefyVault(beefyVault);
        pair = IPool(vault.want());
    }

    function _swapAndStake(address beefyVault, uint256 tokenAmountOutMin, address tokenIn) private {
        (IBeefyVault vault, IPool pair) = _getVaultPair(beefyVault);
        if(pair.factory() != router.defaultFactory()) revert IncompatiblePair(); // router.addLiquidity adds to pair from router.defaultFactory()

        (uint256 reserveA, uint256 reserveB,) = pair.getReserves();
        if (reserveA < minimumAmount || reserveB < minimumAmount) revert ReservesTooLow();

        bool isInputA = pair.token0() == tokenIn;
        if(!isInputA && pair.token1() != tokenIn) revert WrongToken();

        address[] memory path = new address[](2);
        path[0] = tokenIn;
        path[1] = isInputA ? pair.token1() : pair.token0();

        uint256 fullInvestment = IERC20(tokenIn).balanceOf(address(this));
        uint256 swapAmountIn;
        if (isInputA) {
            swapAmountIn = _getSwapAmount(pair, fullInvestment, reserveA, reserveB, path[0], path[1]);
        } else {
            swapAmountIn = _getSwapAmount(pair, fullInvestment, reserveB, reserveA, path[0], path[1]);
        }

        _approveTokenIfNeeded(path[0], address(router));
        uint256[] memory swappedAmounts = _swapExactTokensForTokensSimple(swapAmountIn, tokenAmountOutMin, path[0], path[1], pair.stable(), pair.factory(), address(this), block.timestamp);

        _approveTokenIfNeeded(path[1], address(router));
        (,, uint256 amountLiquidity) = router
        .addLiquidity(path[0], path[1], pair.stable(), fullInvestment - swappedAmounts[0], swappedAmounts[1], 1, 1, address(this), block.timestamp);

        _approveTokenIfNeeded(address(pair), address(vault));
        vault.deposit(amountLiquidity);

        vault.safeTransfer(msg.sender, vault.balanceOf(address(this)));
        _returnAssets(path);
    }

    function _returnAssets(address[] memory tokens) private {
        uint256 balance;
        for (uint256 i; i < tokens.length; ++i) {
            balance = IERC20(tokens[i]).balanceOf(address(this));
            if (balance > 0) {
                if (tokens[i] == WETH) {
                    IWETH(WETH).withdraw(balance);
                    (bool success,) = msg.sender.call{value: balance}(new bytes(0));
                    if(!success) revert TransferFail();
                } else {
                    IERC20(tokens[i]).safeTransfer(msg.sender, balance);
                }
            }
        }
    }

    function _getSwapAmount(IPool pair, uint256 investmentA, uint256 reserveA, uint256 reserveB, address tokenA, address tokenB) private view returns (uint256 swapAmount) {
        uint256 halfInvestment = investmentA / 2;

        if (pair.stable()) {
            swapAmount = _getStableSwap(pair, investmentA, halfInvestment, tokenA, tokenB);
        } else {
            uint256 nominator = pair.getAmountOut(halfInvestment, tokenA);
            uint256 denominator = halfInvestment * (reserveB - nominator) / (reserveA + halfInvestment);
            swapAmount = investmentA - (Babylonian.sqrt(halfInvestment * halfInvestment * nominator / denominator));
        }
    }

    function _getStableSwap(IPool pair, uint256 investmentA, uint256 halfInvestment, address tokenA, address tokenB) private view returns (uint256 swapAmount) {
        uint out = pair.getAmountOut(halfInvestment, tokenA);
        (uint amountA, uint amountB,) = router.quoteAddLiquidity(tokenA, tokenB, pair.stable(), pair.factory(), halfInvestment, out);

        amountA = amountA * 1e18 / 10**IERC20Metadata(tokenA).decimals();
        amountB = amountB * 1e18 / 10**IERC20Metadata(tokenB).decimals();
        out = out * 1e18 / 10**IERC20Metadata(tokenB).decimals();
        halfInvestment = halfInvestment * 1e18 / 10**IERC20Metadata(tokenA).decimals();

        uint ratio = out * 1e18 / halfInvestment * amountA / amountB;

        return investmentA * 1e18 / (ratio + 1e18);
    }

    function estimateSwap(address beefyVault, address tokenIn, uint256 fullInvestmentIn) external view returns (uint256 swapAmountIn, uint256 swapAmountOut, address swapTokenOut) {
        (, IPool pair) = _getVaultPair(beefyVault);
        if(pair.factory() != router.defaultFactory()) revert IncompatiblePair(); // router.addLiquidity adds to pair from router.defaultFactory()

        bool isInputA = pair.token0() == tokenIn;
        if(!isInputA && pair.token1() != tokenIn) revert WrongToken(); // 'Beefy: Input token not present in liquidity pair';

        (uint256 reserveA, uint256 reserveB,) = pair.getReserves();
        (reserveA, reserveB) = isInputA ? (reserveA, reserveB) : (reserveB, reserveA);

        swapTokenOut = isInputA ? pair.token1() : pair.token0();
        swapAmountIn = _getSwapAmount(pair, fullInvestmentIn, reserveA, reserveB, tokenIn, swapTokenOut);
        swapAmountOut = pair.getAmountOut(swapAmountIn, tokenIn);
    }

    function _approveTokenIfNeeded(address token, address spender) private {
        if (IERC20(token).allowance(address(this), spender) == 0) {
            IERC20(token).safeApprove(spender, type(uint256).max);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC20.sol)

pragma solidity ^0.8.0;

import "../token/ERC20/IERC20.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../token/ERC20/extensions/IERC20Metadata.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
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;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    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);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
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 safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    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");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    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");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IPool {
    error DepositsNotEqual();
    error BelowMinimumK();
    error FactoryAlreadySet();
    error InsufficientLiquidity();
    error InsufficientLiquidityMinted();
    error InsufficientLiquidityBurned();
    error InsufficientOutputAmount();
    error InsufficientInputAmount();
    error IsPaused();
    error InvalidTo();
    error K();
    error NotEmergencyCouncil();

    event Fees(address indexed sender, uint256 amount0, uint256 amount1);
    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(address indexed sender, address indexed to, uint256 amount0, uint256 amount1);
    event Swap(
        address indexed sender,
        address indexed to,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out
    );
    event Sync(uint256 reserve0, uint256 reserve1);
    event Claim(address indexed sender, address indexed recipient, uint256 amount0, uint256 amount1);

    function metadata()
    external
    view
    returns (uint256 dec0, uint256 dec1, uint256 r0, uint256 r1, bool st, address t0, address t1);

    function claimFees() external returns (uint256, uint256);

    function factory() external view returns (address);

    function tokens() external view returns (address, address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function stable() external view returns (bool);

    function swap(uint256 amount0Out, uint256 amount1Out, address to, bytes calldata data) external;

    function burn(address to) external returns (uint256 amount0, uint256 amount1);

    function mint(address to) external returns (uint256 liquidity);

    function getReserves() external view returns (uint256 _reserve0, uint256 _reserve1, uint256 _blockTimestampLast);

    function getAmountOut(uint256, address) external view returns (uint256);

    function skim(address to) external;

    function initialize(address _token0, address _token1, bool _stable) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IRouter {
    struct Route {
        address from;
        address to;
        bool stable;
        address factory;
    }

    error ConversionFromV2ToV1VeloProhibited();
    error ETHTransferFailed();
    error Expired();
    error InsufficientAmount();
    error InsufficientAmountA();
    error InsufficientAmountB();
    error InsufficientAmountADesired();
    error InsufficientAmountBDesired();
    error InsufficientAmountAOptimal();
    error InsufficientLiquidity();
    error InsufficientOutputAmount();
    error InvalidAmountInForETHDeposit();
    error InvalidTokenInForETHDeposit();
    error InvalidPath();
    error InvalidRouteA();
    error InvalidRouteB();
    error OnlyWETH();
    error PoolDoesNotExist();
    error PoolFactoryDoesNotExist();
    error SameAddresses();
    error ZeroAddress();

    /// @dev Struct containing information necessary to zap in and out of pools
    /// @param tokenA           .
    /// @param tokenB           .
    /// @param stable           Stable or volatile pool
    /// @param factory          factory of pool
    /// @param amountOutMinA    Minimum amount expected from swap leg of zap via routesA
    /// @param amountOutMinB    Minimum amount expected from swap leg of zap via routesB
    /// @param amountAMin       Minimum amount of tokenA expected from liquidity leg of zap
    /// @param amountBMin       Minimum amount of tokenB expected from liquidity leg of zap
    struct Zap {
        address tokenA;
        address tokenB;
        bool stable;
        address factory;
        uint256 amountOutMinA;
        uint256 amountOutMinB;
        uint256 amountAMin;
        uint256 amountBMin;
    }

    /// @notice Sort two tokens by which address value is less than the other
    /// @param tokenA   Address of token to sort
    /// @param tokenB   Address of token to sort
    /// @return token0  Lower address value between tokenA and tokenB
    /// @return token1  Higher address value between tokenA and tokenB
    function sortTokens(address tokenA, address tokenB) external pure returns (address token0, address token1);

    /// @notice Calculate the address of a pool by its' factory.
    ///         Used by all Router functions containing a `Route[]` or `_factory` argument.
    ///         Reverts if _factory is not approved by the FactoryRegistry
    /// @dev Returns a randomly generated address for a nonexistent pool
    /// @param tokenA   Address of token to query
    /// @param tokenB   Address of token to query
    /// @param stable   True if pool is stable, false if volatile
    /// @param _factory Address of factory which created the pool
    function poolFor(
        address tokenA,
        address tokenB,
        bool stable,
        address _factory
    ) external view returns (address pool);

    /// @notice Wraps around poolFor(tokenA,tokenB,stable,_factory) for backwards compatibility to Velodrome v1
    function pairFor(
        address tokenA,
        address tokenB,
        bool stable,
        address _factory
    ) external view returns (address pool);

    /// @notice Fetch and sort the reserves for a pool
    /// @param tokenA       .
    /// @param tokenB       .
    /// @param stable       True if pool is stable, false if volatile
    /// @param _factory     Address of PoolFactory for tokenA and tokenB
    /// @return reserveA    Amount of reserves of the sorted token A
    /// @return reserveB    Amount of reserves of the sorted token B
    function getReserves(
        address tokenA,
        address tokenB,
        bool stable,
        address _factory
    ) external view returns (uint256 reserveA, uint256 reserveB);

    /// @notice Perform chained getAmountOut calculations on any number of pools
    function getAmountsOut(uint256 amountIn, Route[] memory routes) external view returns (uint256[] memory amounts);

    // **** ADD LIQUIDITY ****

    /// @notice Quote the amount deposited into a Pool
    /// @param tokenA           .
    /// @param tokenB           .
    /// @param stable           True if pool is stable, false if volatile
    /// @param _factory         Address of PoolFactory for tokenA and tokenB
    /// @param amountADesired   Amount of tokenA desired to deposit
    /// @param amountBDesired   Amount of tokenB desired to deposit
    /// @return amountA         Amount of tokenA to actually deposit
    /// @return amountB         Amount of tokenB to actually deposit
    /// @return liquidity       Amount of liquidity token returned from deposit
    function quoteAddLiquidity(
        address tokenA,
        address tokenB,
        bool stable,
        address _factory,
        uint256 amountADesired,
        uint256 amountBDesired
    ) external view returns (uint256 amountA, uint256 amountB, uint256 liquidity);

    /// @notice Quote the amount of liquidity removed from a Pool
    /// @param tokenA       .
    /// @param tokenB       .
    /// @param stable       True if pool is stable, false if volatile
    /// @param _factory     Address of PoolFactory for tokenA and tokenB
    /// @param liquidity    Amount of liquidity to remove
    /// @return amountA     Amount of tokenA received
    /// @return amountB     Amount of tokenB received
    function quoteRemoveLiquidity(
        address tokenA,
        address tokenB,
        bool stable,
        address _factory,
        uint256 liquidity
    ) external view returns (uint256 amountA, uint256 amountB);

    /// @notice Add liquidity of two tokens to a Pool
    /// @param tokenA           .
    /// @param tokenB           .
    /// @param stable           True if pool is stable, false if volatile
    /// @param amountADesired   Amount of tokenA desired to deposit
    /// @param amountBDesired   Amount of tokenB desired to deposit
    /// @param amountAMin       Minimum amount of tokenA to deposit
    /// @param amountBMin       Minimum amount of tokenB to deposit
    /// @param to               Recipient of liquidity token
    /// @param deadline         Deadline to receive liquidity
    /// @return amountA         Amount of tokenA to actually deposit
    /// @return amountB         Amount of tokenB to actually deposit
    /// @return liquidity       Amount of liquidity token returned from deposit
    function addLiquidity(
        address tokenA,
        address tokenB,
        bool stable,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB, uint256 liquidity);

    /// @notice Add liquidity of a token and WETH (transferred as ETH) to a Pool
    /// @param token                .
    /// @param stable               True if pool is stable, false if volatile
    /// @param amountTokenDesired   Amount of token desired to deposit
    /// @param amountTokenMin       Minimum amount of token to deposit
    /// @param amountETHMin         Minimum amount of ETH to deposit
    /// @param to                   Recipient of liquidity token
    /// @param deadline             Deadline to add liquidity
    /// @return amountToken         Amount of token to actually deposit
    /// @return amountETH           Amount of tokenETH to actually deposit
    /// @return liquidity           Amount of liquidity token returned from deposit
    function addLiquidityETH(
        address token,
        bool stable,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external payable returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);

    // **** REMOVE LIQUIDITY ****

    /// @notice Remove liquidity of two tokens from a Pool
    /// @param tokenA       .
    /// @param tokenB       .
    /// @param stable       True if pool is stable, false if volatile
    /// @param liquidity    Amount of liquidity to remove
    /// @param amountAMin   Minimum amount of tokenA to receive
    /// @param amountBMin   Minimum amount of tokenB to receive
    /// @param to           Recipient of tokens received
    /// @param deadline     Deadline to remove liquidity
    /// @return amountA     Amount of tokenA received
    /// @return amountB     Amount of tokenB received
    function removeLiquidity(
        address tokenA,
        address tokenB,
        bool stable,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB);

    /// @notice Remove liquidity of a token and WETH (returned as ETH) from a Pool
    /// @param token            .
    /// @param stable           True if pool is stable, false if volatile
    /// @param liquidity        Amount of liquidity to remove
    /// @param amountTokenMin   Minimum amount of token to receive
    /// @param amountETHMin     Minimum amount of ETH to receive
    /// @param to               Recipient of liquidity token
    /// @param deadline         Deadline to receive liquidity
    /// @return amountToken     Amount of token received
    /// @return amountETH       Amount of ETH received
    function removeLiquidityETH(
        address token,
        bool stable,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountToken, uint256 amountETH);

    /// @notice Remove liquidity of a fee-on-transfer token and WETH (returned as ETH) from a Pool
    /// @param token            .
    /// @param stable           True if pool is stable, false if volatile
    /// @param liquidity        Amount of liquidity to remove
    /// @param amountTokenMin   Minimum amount of token to receive
    /// @param amountETHMin     Minimum amount of ETH to receive
    /// @param to               Recipient of liquidity token
    /// @param deadline         Deadline to receive liquidity
    /// @return amountETH       Amount of ETH received
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        bool stable,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountETH);

    // **** SWAP ****

    /// @notice Swap one token for another
    /// @param amountIn     Amount of token in
    /// @param amountOutMin Minimum amount of desired token received
    /// @param routes       Array of trade routes used in the swap
    /// @param to           Recipient of the tokens received
    /// @param deadline     Deadline to receive tokens
    /// @return amounts     Array of amounts returned per route
    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        Route[] calldata routes,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    /// @notice Swap ETH for a token
    /// @param amountOutMin Minimum amount of desired token received
    /// @param routes       Array of trade routes used in the swap
    /// @param to           Recipient of the tokens received
    /// @param deadline     Deadline to receive tokens
    /// @return amounts     Array of amounts returned per route
    function swapExactETHForTokens(
        uint256 amountOutMin,
        Route[] calldata routes,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    /// @notice Swap a token for WETH (returned as ETH)
    /// @param amountIn     Amount of token in
    /// @param amountOutMin Minimum amount of desired ETH
    /// @param routes       Array of trade routes used in the swap
    /// @param to           Recipient of the tokens received
    /// @param deadline     Deadline to receive tokens
    /// @return amounts     Array of amounts returned per route
    function swapExactTokensForETH(
        uint256 amountIn,
        uint256 amountOutMin,
        Route[] calldata routes,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    /// @notice Swap one token for another without slippage protection
    /// @return amounts     Array of amounts to swap  per route
    /// @param routes       Array of trade routes used in the swap
    /// @param to           Recipient of the tokens received
    /// @param deadline     Deadline to receive tokens
    function UNSAFE_swapExactTokensForTokens(
        uint256[] memory amounts,
        Route[] calldata routes,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory);

    // **** SWAP (supporting fee-on-transfer tokens) ****

    /// @notice Swap one token for another supporting fee-on-transfer tokens
    /// @param amountIn     Amount of token in
    /// @param amountOutMin Minimum amount of desired token received
    /// @param routes       Array of trade routes used in the swap
    /// @param to           Recipient of the tokens received
    /// @param deadline     Deadline to receive tokens
    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        Route[] calldata routes,
        address to,
        uint256 deadline
    ) external;

    /// @notice Swap ETH for a token supporting fee-on-transfer tokens
    /// @param amountOutMin Minimum amount of desired token received
    /// @param routes       Array of trade routes used in the swap
    /// @param to           Recipient of the tokens received
    /// @param deadline     Deadline to receive tokens
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        Route[] calldata routes,
        address to,
        uint256 deadline
    ) external payable;

    /// @notice Swap a token for WETH (returned as ETH) supporting fee-on-transfer tokens
    /// @param amountIn     Amount of token in
    /// @param amountOutMin Minimum amount of desired ETH
    /// @param routes       Array of trade routes used in the swap
    /// @param to           Recipient of the tokens received
    /// @param deadline     Deadline to receive tokens
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        Route[] calldata routes,
        address to,
        uint256 deadline
    ) external;

    /// @notice Zap a token A into a pool (B, C). (A can be equal to B or C).
    ///         Supports standard ERC20 tokens only (i.e. not fee-on-transfer tokens etc).
    ///         Slippage is required for the initial swap.
    ///         Additional slippage may be required when adding liquidity as the
    ///         price of the token may have changed.
    /// @param tokenIn      Token you are zapping in from (i.e. input token).
    /// @param amountInA    Amount of input token you wish to send down routesA
    /// @param amountInB    Amount of input token you wish to send down routesB
    /// @param zapInPool    Contains zap struct information. See Zap struct.
    /// @param routesA      Route used to convert input token to tokenA
    /// @param routesB      Route used to convert input token to tokenB
    /// @param to           Address you wish to mint liquidity to.
    /// @param stake        Auto-stake liquidity in corresponding gauge.
    /// @return liquidity   Amount of LP tokens created from zapping in.
    function zapIn(
        address tokenIn,
        uint256 amountInA,
        uint256 amountInB,
        Zap calldata zapInPool,
        Route[] calldata routesA,
        Route[] calldata routesB,
        address to,
        bool stake
    ) external payable returns (uint256 liquidity);

    /// @notice Zap out a pool (B, C) into A.
    ///         Supports standard ERC20 tokens only (i.e. not fee-on-transfer tokens etc).
    ///         Slippage is required for the removal of liquidity.
    ///         Additional slippage may be required on the swap as the
    ///         price of the token may have changed.
    /// @param tokenOut     Token you are zapping out to (i.e. output token).
    /// @param liquidity    Amount of liquidity you wish to remove.
    /// @param zapOutPool   Contains zap struct information. See Zap struct.
    /// @param routesA      Route used to convert tokenA into output token.
    /// @param routesB      Route used to convert tokenB into output token.
    function zapOut(
        address tokenOut,
        uint256 liquidity,
        Zap calldata zapOutPool,
        Route[] calldata routesA,
        Route[] calldata routesB
    ) external;

    /// @notice Used to generate params required for zapping in.
    ///         Zap in => remove liquidity then swap.
    ///         Apply slippage to expected swap values to account for changes in reserves in between.
    /// @dev Output token refers to the token you want to zap in from.
    /// @param tokenA           .
    /// @param tokenB           .
    /// @param stable           .
    /// @param _factory         .
    /// @param amountInA        Amount of input token you wish to send down routesA
    /// @param amountInB        Amount of input token you wish to send down routesB
    /// @param routesA          Route used to convert input token to tokenA
    /// @param routesB          Route used to convert input token to tokenB
    /// @return amountOutMinA   Minimum output expected from swapping input token to tokenA.
    /// @return amountOutMinB   Minimum output expected from swapping input token to tokenB.
    /// @return amountAMin      Minimum amount of tokenA expected from depositing liquidity.
    /// @return amountBMin      Minimum amount of tokenB expected from depositing liquidity.
    function generateZapInParams(
        address tokenA,
        address tokenB,
        bool stable,
        address _factory,
        uint256 amountInA,
        uint256 amountInB,
        Route[] calldata routesA,
        Route[] calldata routesB
    ) external view returns (uint256 amountOutMinA, uint256 amountOutMinB, uint256 amountAMin, uint256 amountBMin);

    /// @notice Used to generate params required for zapping out.
    ///         Zap out => swap then add liquidity.
    ///         Apply slippage to expected liquidity values to account for changes in reserves in between.
    /// @dev Output token refers to the token you want to zap out of.
    /// @param tokenA           .
    /// @param tokenB           .
    /// @param stable           .
    /// @param _factory         .
    /// @param liquidity        Amount of liquidity being zapped out of into a given output token.
    /// @param routesA          Route used to convert tokenA into output token.
    /// @param routesB          Route used to convert tokenB into output token.
    /// @return amountOutMinA   Minimum output expected from swapping tokenA into output token.
    /// @return amountOutMinB   Minimum output expected from swapping tokenB into output token.
    /// @return amountAMin      Minimum amount of tokenA expected from withdrawing liquidity.
    /// @return amountBMin      Minimum amount of tokenB expected from withdrawing liquidity.
    function generateZapOutParams(
        address tokenA,
        address tokenB,
        bool stable,
        address _factory,
        uint256 liquidity,
        Route[] calldata routesA,
        Route[] calldata routesB
    ) external view returns (uint256 amountOutMinA, uint256 amountOutMinB, uint256 amountAMin, uint256 amountBMin);

    /// @notice Used by zapper to determine appropriate ratio of A to B to deposit liquidity. Assumes stable pool.
    /// @dev Returns stable liquidity ratio of B to (A + B).
    ///      E.g. if ratio is 0.4, it means there is more of A than there is of B.
    ///      Therefore you should deposit more of token A than B.
    /// @param tokenA   tokenA of stable pool you are zapping into.
    /// @param tokenB   tokenB of stable pool you are zapping into.
    /// @param factory  Factory that created stable pool.
    /// @return ratio   Ratio of token0 to token1 required to deposit into zap.
    function quoteStableLiquidityRatio(
        address tokenA,
        address tokenB,
        address factory
    ) external view returns (uint256 ratio);

    function weth() external view returns (address);
    function defaultFactory() external view returns (address);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

contract ZapErrors {
    error InsignificantAmount();
    error NotWETH();
    error WrongToken(); // Beefy: desired token not present in liquidity pair.
    error InsufficientAmount();
    error IncompatiblePair();
    error ReservesTooLow();
    error TransferFail();
}

// SPDX-License-Identifier: BSD-4-Clause

pragma solidity >=0.8.0;

// computes square roots using the babylonian method
// https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method
library Babylonian {
    // credit for this implementation goes to
    // https://github.com/abdk-consulting/abdk-libraries-solidity/blob/5e1e7c11b35f8313d3f7ce11c1b86320d7c0b554/ABDKMath64x64.sol#L725
    function sqrt(uint256 x) internal pure returns (uint256) {
        unchecked {
            if (x == 0) return 0;
            else {
                uint256 xx = x;
                uint256 r = 1;
                if (xx >= 0x100000000000000000000000000000000) { xx >>= 128; r <<= 64; }
                if (xx >= 0x10000000000000000) { xx >>= 64; r <<= 32; }
                if (xx >= 0x100000000) { xx >>= 32; r <<= 16; }
                if (xx >= 0x10000) { xx >>= 16; r <<= 8; }
                if (xx >= 0x100) { xx >>= 8; r <<= 4; }
                if (xx >= 0x10) { xx >>= 4; r <<= 2; }
                if (xx >= 0x4) { r <<= 1; }
                r = (r + x / r) >> 1;
                r = (r + x / r) >> 1;
                r = (r + x / r) >> 1;
                r = (r + x / r) >> 1;
                r = (r + x / r) >> 1;
                r = (r + x / r) >> 1;
                r = (r + x / r) >> 1; // Seven iterations should be enough
                uint256 r1 = x / r;
                return (r < r1 ? r : r1);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin-4/contracts/token/ERC20/ERC20.sol";

interface IBeefyVault is IERC20 {
    function deposit(uint256 amount) external;
    function withdraw(uint256 shares) external;
    function want() external pure returns (address); // Beefy Vault V6
    function token() external pure returns (address); // Beefy Vault V5
    function balance() external pure returns (uint256);
    function totalSupply() external pure returns (uint256);
    function strategy() external pure returns (address);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin-4/contracts/token/ERC20/ERC20.sol";

interface IWETH is IERC20 {
    function deposit() external payable;
    function withdraw(uint256 wad) external;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_router","type":"address"},{"internalType":"address","name":"_WETH","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"IncompatiblePair","type":"error"},{"inputs":[],"name":"InsignificantAmount","type":"error"},{"inputs":[],"name":"InsufficientAmount","type":"error"},{"inputs":[],"name":"NotWETH","type":"error"},{"inputs":[],"name":"ReservesTooLow","type":"error"},{"inputs":[],"name":"TransferFail","type":"error"},{"inputs":[],"name":"WrongToken","type":"error"},{"inputs":[],"name":"WETH","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"beefyVault","type":"address"},{"internalType":"uint256","name":"tokenAmountOutMin","type":"uint256"},{"internalType":"address","name":"tokenIn","type":"address"},{"internalType":"uint256","name":"tokenInAmount","type":"uint256"}],"name":"beefIn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"beefyVault","type":"address"},{"internalType":"uint256","name":"tokenAmountOutMin","type":"uint256"}],"name":"beefInETH","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"beefyVault","type":"address"},{"internalType":"uint256","name":"withdrawAmount","type":"uint256"}],"name":"beefOut","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"beefyVault","type":"address"},{"internalType":"uint256","name":"withdrawAmount","type":"uint256"},{"internalType":"address","name":"desiredToken","type":"address"},{"internalType":"uint256","name":"desiredTokenOutMin","type":"uint256"}],"name":"beefOutAndSwap","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"beefyVault","type":"address"},{"internalType":"address","name":"tokenIn","type":"address"},{"internalType":"uint256","name":"fullInvestmentIn","type":"uint256"}],"name":"estimateSwap","outputs":[{"internalType":"uint256","name":"swapAmountIn","type":"uint256"},{"internalType":"uint256","name":"swapAmountOut","type":"uint256"},{"internalType":"address","name":"swapTokenOut","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"router","outputs":[{"internalType":"contract IRouter","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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000000000000000000000000a062ae8a9c5e11aaa026fc2670b0d65ccc8b28580000000000000000000000004200000000000000000000000000000000000006

-----Decoded View---------------
Arg [0] : _router (address): 0xa062aE8A9c5e11aaA026fc2670B0D65cCc8B2858
Arg [1] : _WETH (address): 0x4200000000000000000000000000000000000006

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000a062ae8a9c5e11aaa026fc2670b0d65ccc8b2858
Arg [1] : 0000000000000000000000004200000000000000000000000000000000000006