// 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/utils/FixedPointMathLib.sol



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

/// @notice Arithmetic library with operations for fixed-point numbers.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/FixedPointMathLib.sol)
/// @author Inspired by USM (https://github.com/usmfum/USM/blob/master/contracts/WadMath.sol)
library FixedPointMathLib {
    /*//////////////////////////////////////////////////////////////
                    SIMPLIFIED FIXED POINT OPERATIONS
    //////////////////////////////////////////////////////////////*/

    uint256 internal constant MAX_UINT256 = 2**256 - 1;

    uint256 internal constant WAD = 1e18; // The scalar of ETH and most ERC20s.

    function mulWadDown(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivDown(x, y, WAD); // Equivalent to (x * y) / WAD rounded down.
    }

    function mulWadUp(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivUp(x, y, WAD); // Equivalent to (x * y) / WAD rounded up.
    }

    function divWadDown(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivDown(x, WAD, y); // Equivalent to (x * WAD) / y rounded down.
    }

    function divWadUp(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivUp(x, WAD, y); // Equivalent to (x * WAD) / y rounded up.
    }

    /*//////////////////////////////////////////////////////////////
                    LOW LEVEL FIXED POINT OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function mulDivDown(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Equivalent to require(denominator != 0 && (y == 0 || x <= type(uint256).max / y))
            if iszero(mul(denominator, iszero(mul(y, gt(x, div(MAX_UINT256, y)))))) {
                revert(0, 0)
            }

            // Divide x * y by the denominator.
            z := div(mul(x, y), denominator)
        }
    }

    function mulDivUp(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Equivalent to require(denominator != 0 && (y == 0 || x <= type(uint256).max / y))
            if iszero(mul(denominator, iszero(mul(y, gt(x, div(MAX_UINT256, y)))))) {
                revert(0, 0)
            }

            // If x * y modulo the denominator is strictly greater than 0,
            // 1 is added to round up the division of x * y by the denominator.
            z := add(gt(mod(mul(x, y), denominator), 0), div(mul(x, y), denominator))
        }
    }

    function rpow(
        uint256 x,
        uint256 n,
        uint256 scalar
    ) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            switch x
            case 0 {
                switch n
                case 0 {
                    // 0 ** 0 = 1
                    z := scalar
                }
                default {
                    // 0 ** n = 0
                    z := 0
                }
            }
            default {
                switch mod(n, 2)
                case 0 {
                    // If n is even, store scalar in z for now.
                    z := scalar
                }
                default {
                    // If n is odd, store x in z for now.
                    z := x
                }

                // Shifting right by 1 is like dividing by 2.
                let half := shr(1, scalar)

                for {
                    // Shift n right by 1 before looping to halve it.
                    n := shr(1, n)
                } n {
                    // Shift n right by 1 each iteration to halve it.
                    n := shr(1, n)
                } {
                    // Revert immediately if x ** 2 would overflow.
                    // Equivalent to iszero(eq(div(xx, x), x)) here.
                    if shr(128, x) {
                        revert(0, 0)
                    }

                    // Store x squared.
                    let xx := mul(x, x)

                    // Round to the nearest number.
                    let xxRound := add(xx, half)

                    // Revert if xx + half overflowed.
                    if lt(xxRound, xx) {
                        revert(0, 0)
                    }

                    // Set x to scaled xxRound.
                    x := div(xxRound, scalar)

                    // If n is even:
                    if mod(n, 2) {
                        // Compute z * x.
                        let zx := mul(z, x)

                        // If z * x overflowed:
                        if iszero(eq(div(zx, x), z)) {
                            // Revert if x is non-zero.
                            if iszero(iszero(x)) {
                                revert(0, 0)
                            }
                        }

                        // Round to the nearest number.
                        let zxRound := add(zx, half)

                        // Revert if zx + half overflowed.
                        if lt(zxRound, zx) {
                            revert(0, 0)
                        }

                        // Return properly scaled zxRound.
                        z := div(zxRound, scalar)
                    }
                }
            }
        }
    }

    /*//////////////////////////////////////////////////////////////
                        GENERAL NUMBER UTILITIES
    //////////////////////////////////////////////////////////////*/

    function sqrt(uint256 x) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            let y := x // We start y at x, which will help us make our initial estimate.

            z := 181 // The "correct" value is 1, but this saves a multiplication later.

            // This segment is to get a reasonable initial estimate for the Babylonian method. With a bad
            // start, the correct # of bits increases ~linearly each iteration instead of ~quadratically.

            // We check y >= 2^(k + 8) but shift right by k bits
            // each branch to ensure that if x >= 256, then y >= 256.
            if iszero(lt(y, 0x10000000000000000000000000000000000)) {
                y := shr(128, y)
                z := shl(64, z)
            }
            if iszero(lt(y, 0x1000000000000000000)) {
                y := shr(64, y)
                z := shl(32, z)
            }
            if iszero(lt(y, 0x10000000000)) {
                y := shr(32, y)
                z := shl(16, z)
            }
            if iszero(lt(y, 0x1000000)) {
                y := shr(16, y)
                z := shl(8, z)
            }

            // Goal was to get z*z*y within a small factor of x. More iterations could
            // get y in a tighter range. Currently, we will have y in [256, 256*2^16).
            // We ensured y >= 256 so that the relative difference between y and y+1 is small.
            // That's not possible if x < 256 but we can just verify those cases exhaustively.

            // Now, z*z*y <= x < z*z*(y+1), and y <= 2^(16+8), and either y >= 256, or x < 256.
            // Correctness can be checked exhaustively for x < 256, so we assume y >= 256.
            // Then z*sqrt(y) is within sqrt(257)/sqrt(256) of sqrt(x), or about 20bps.

            // For s in the range [1/256, 256], the estimate f(s) = (181/1024) * (s+1) is in the range
            // (1/2.84 * sqrt(s), 2.84 * sqrt(s)), with largest error when s = 1 and when s = 256 or 1/256.

            // Since y is in [256, 256*2^16), let a = y/65536, so that a is in [1/256, 256). Then we can estimate
            // sqrt(y) using sqrt(65536) * 181/1024 * (a + 1) = 181/4 * (y + 65536)/65536 = 181 * (y + 65536)/2^18.

            // There is no overflow risk here since y < 2^136 after the first branch above.
            z := shr(18, mul(z, add(y, 65536))) // A mul() is saved from starting z at 181.

            // Given the worst case multiplicative error of 2.84 above, 7 iterations should be enough.
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))

            // If x+1 is a perfect square, the Babylonian method cycles between
            // floor(sqrt(x)) and ceil(sqrt(x)). This statement ensures we return floor.
            // See: https://en.wikipedia.org/wiki/Integer_square_root#Using_only_integer_division
            // Since the ceil is rare, we save gas on the assignment and repeat division in the rare case.
            // If you don't care whether the floor or ceil square root is returned, you can remove this statement.
            z := sub(z, lt(div(x, z), z))
        }
    }

    function unsafeMod(uint256 x, uint256 y) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Mod x by y. Note this will return
            // 0 instead of reverting if y is zero.
            z := mod(x, y)
        }
    }

    function unsafeDiv(uint256 x, uint256 y) internal pure returns (uint256 r) {
        /// @solidity memory-safe-assembly
        assembly {
            // Divide x by y. Note this will return
            // 0 instead of reverting if y is zero.
            r := div(x, y)
        }
    }

    function unsafeDivUp(uint256 x, uint256 y) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Add 1 to x * y if x % y > 0. Note this will
            // return 0 instead of reverting if y is zero.
            z := add(gt(mod(x, y), 0), div(x, y))
        }
    }
}

// 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), from) // Append the "from" argument.
            mstore(add(freeMemoryPointer, 36), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 68), amount) // Append the "amount" argument.

            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), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument.

            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), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument.

            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/Strategy.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.9;

import './Vault.sol';

/** @dev
 * Strategies have to implement the following virtual functions:
 *
 * totalAssets()
 * _withdraw(uint256, address)
 * _harvest()
 * _invest()
 */
abstract contract Strategy is Ownership {
	using SafeTransferLib for ERC20;
	using FixedPointMathLib for uint256;

	Vault public immutable vault;
	ERC20 public immutable asset;

	/// @notice address which performance fees are sent to
	address public treasury;
	/// @notice performance fee sent to treasury / FEE_BASIS of 10_000
	uint16 public fee = 1_000;
	uint16 internal constant MAX_FEE = 1_000;
	uint16 internal constant FEE_BASIS = 10_000;

	/// @notice used to calculate slippage / SLIP_BASIS of 10_000
	/// @dev default to 99% (or 1%)
	uint16 public slip = 9_900;
	uint16 internal constant SLIP_BASIS = 10_000;

	/*//////////////////
	/      Events      /
	//////////////////*/

	event FeeChanged(uint16 newFee);
	event SlipChanged(uint16 newSlip);
	event TreasuryChanged(address indexed newTreasury);

	/*//////////////////
	/      Errors      /
	//////////////////*/

	error Zero();
	error NotVault();
	error InvalidValue();
	error AlreadyValue();

	constructor(
		Vault _vault,
		address _treasury,
		address _nominatedOwner,
		address _admin,
		address[] memory _authorized
	) Ownership(_nominatedOwner, _admin, _authorized) {
		vault = _vault;
		asset = vault.asset();
		treasury = _treasury;
	}

	/*//////////////////////////
	/      Public Virtual      /
	//////////////////////////*/

	/// @notice amount of 'asset' currently managed by strategy
	function totalAssets() public view virtual returns (uint256);

	/*///////////////////////////////////////////
	/      Restricted Functions: onlyVault      /
	///////////////////////////////////////////*/

	function withdraw(uint256 _assets)
		external
		onlyVault
		returns (
			uint256 received,
			uint256 slippage,
			uint256 bonus
		)
	{
		uint256 total = totalAssets();
		if (total == 0) revert Zero();

		uint256 assets = _assets > total ? total : _assets;

		received = _withdraw(assets);

		unchecked {
			if (assets > received) slippage = assets - received;
			else if (received > assets) {
				bonus = received - assets;
				// received cannot > assets for vault calcuations
				received = assets;
			}
		}
	}

	/*//////////////////////////////////////////////////
	/      Restricted Functions: onlyAdminOrVault      /
	//////////////////////////////////////////////////*/

	function harvest() external onlyAdminOrVault returns (uint256 received) {
		_harvest();

		received = asset.balanceOf(address(this));

		if (fee > 0) {
			uint256 feeAmount = _calculateFee(received);
			received -= feeAmount;
			asset.safeTransfer(treasury, feeAmount);
		}

		asset.safeTransfer(address(vault), received);
	}

	function invest() external onlyAdminOrVault {
		_invest();
	}

	/*///////////////////////////////////////////
	/      Restricted Functions: onlyOwner      /
	///////////////////////////////////////////*/

	function setFee(uint16 _fee) external onlyOwner {
		if (_fee > MAX_FEE) revert InvalidValue();
		if (_fee == fee) revert AlreadyValue();
		fee = _fee;
		emit FeeChanged(_fee);
	}

	function setTreasury(address _treasury) external onlyOwner {
		if (_treasury == treasury) revert AlreadyValue();
		treasury = _treasury;
		emit TreasuryChanged(_treasury);
	}

	/*////////////////////////////////////////////
	/      Restricted Functions: onlyAdmins      /
	////////////////////////////////////////////*/

	function setSlip(uint16 _slip) external onlyAdmins {
		if (_slip > SLIP_BASIS) revert InvalidValue();
		if (_slip == slip) revert AlreadyValue();
		slip = _slip;
		emit SlipChanged(_slip);
	}

	/*////////////////////////////
	/      Internal Virtual      /
	////////////////////////////*/

	function _withdraw(uint256 _assets) internal virtual returns (uint256 received);

	/// @dev return harvested assets
	function _harvest() internal virtual;

	function _invest() internal virtual;

	/*//////////////////////////////
	/      Internal Functions      /
	//////////////////////////////*/

	function _calculateSlippage(uint256 _amount) internal view returns (uint256) {
		return _amount.mulDivDown(slip, SLIP_BASIS);
	}

	function _calculateFee(uint256 _amount) internal view returns (uint256) {
		return _amount.mulDivDown(fee, FEE_BASIS);
	}

	modifier onlyVault() {
		if (msg.sender != address(vault)) revert NotVault();
		_;
	}

	/*//////////////////////////////
	/      Internal Functions      /
	//////////////////////////////*/

	modifier onlyAdminOrVault() {
		if (msg.sender != owner && msg.sender != admin && msg.sender != address(vault)) revert Unauthorized();
		_;
	}
}

// File: src/Swap.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.9;

import 'solmate/tokens/ERC20.sol';
import 'solmate/utils/SafeTransferLib.sol';
import './external/uniswap/ISwapRouter02.sol';
import './external/sushiswap/ISushiRouter.sol';
import './libraries/Ownable.sol';
import './libraries/Path.sol';

/**
 * @notice
 * Swap contract used by strategies to:
 * 1. swap strategy rewards to 'asset'
 * 2. zap similar tokens to asset (e.g. USDT to USDC)
 */
contract Swap is Ownable {
	using SafeTransferLib for ERC20;
	using Path for bytes;

	enum Route {
		Unsupported,
		UniswapV2,
		UniswapV3Direct,
		UniswapV3Path,
		SushiSwap
	}

	/**
		@dev info depends on route:
		UniswapV2: address[] path
		UniswapV3Direct: uint24 fee
		UniswapV3Path: bytes path (address, uint24 fee, address, uint24 fee, address)
	 */
	struct RouteInfo {
		Route route;
		bytes info;
	}

	ISushiRouter internal constant sushiswap = ISushiRouter(0xd9e1cE17f2641f24aE83637ab66a2cca9C378B9F);
	/// @dev single address which supports both uniswap v2 and v3 routes
	ISwapRouter02 internal constant uniswap = ISwapRouter02(0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45);

	/// @dev tokenIn => tokenOut => routeInfo
	mapping(address => mapping(address => RouteInfo)) public routes;

	address internal constant CRV = 0xD533a949740bb3306d119CC777fa900bA034cd52;
	address internal constant CVX = 0x4e3FBD56CD56c3e72c1403e103b45Db9da5B9D2B;

	address internal constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
	address internal constant WBTC = 0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C599;

	address internal constant USDC = 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48;
	address internal constant DAI = 0x6B175474E89094C44Da98b954EedeAC495271d0F;
	address internal constant USDT = 0xdAC17F958D2ee523a2206206994597C13D831ec7;

	address internal constant LDO = 0x5A98FcBEA516Cf06857215779Fd812CA3beF1B32;
	address internal constant PNT = 0x89Ab32156e46F46D02ade3FEcbe5Fc4243B9AAeD;

	/*//////////////////
	/      Events      /
	//////////////////*/

	event RouteSet(address indexed tokenIn, address indexed tokenOut, RouteInfo routeInfo);
	event RouteRemoved(address indexed tokenIn, address indexed tokenOut);

	/*//////////////////
	/      Errors      /
	//////////////////*/

	error UnsupportedRoute(address tokenIn, address tokenOut);
	error InvalidRouteInfo();

	constructor() Ownable() {
		// Solidity arrays are dumb
		address[] memory path = new address[](3);
		path[0] = CRV;
		path[1] = WETH;
		path[2] = USDC;

		_setRoute(CRV, USDC, RouteInfo({route: Route.UniswapV2, info: abi.encode(path)}));

		path[2] = WBTC;
		_setRoute(CRV, WBTC, RouteInfo({route: Route.SushiSwap, info: abi.encode(path)}));

		_setRoute(CRV, WETH, RouteInfo({route: Route.UniswapV3Direct, info: abi.encode(uint24(3_000))}));

		_setRoute(
			CVX,
			USDC,
			RouteInfo({
				route: Route.UniswapV3Path,
				info: abi.encodePacked(CVX, uint24(10_000), WETH, uint24(500), USDC)
			})
		);
		_setRoute(
			CVX,
			WBTC,
			RouteInfo({
				route: Route.UniswapV3Path,
				info: abi.encodePacked(CVX, uint24(10_000), WETH, uint24(500), WBTC)
			})
		);

		address[] memory shortPath = new address[](2);
		shortPath[0] = CVX;
		shortPath[1] = WETH;

		_setRoute(CVX, WETH, RouteInfo({route: Route.SushiSwap, info: abi.encode(shortPath)}));

		shortPath[0] = LDO;
		_setRoute(LDO, WETH, RouteInfo({route: Route.SushiSwap, info: abi.encode(shortPath)}));

		path[0] = PNT;
		_setRoute(PNT, WBTC, RouteInfo({route: Route.UniswapV2, info: abi.encode(path)}));

		_setRoute(USDT, USDC, RouteInfo({route: Route.UniswapV3Direct, info: abi.encode(uint24(100))}));
		_setRoute(DAI, USDC, RouteInfo({route: Route.UniswapV3Direct, info: abi.encode(uint24(100))}));
	}

	/*///////////////////////
	/      Public View      /
	///////////////////////*/

	function getRoute(address _tokenIn, address _tokenOut) external view returns (RouteInfo memory routeInfo) {
		return routes[_tokenIn][_tokenOut];
	}

	/*////////////////////////////
	/      Public Functions      /
	////////////////////////////*/

	function swapTokens(
		address _tokenIn,
		address _tokenOut,
		uint256 _amount,
		uint256 _minReceived
	) external returns (uint256 received) {
		RouteInfo memory routeInfo = routes[_tokenIn][_tokenOut];
		Route route = routeInfo.route;

		ERC20(_tokenIn).safeTransferFrom(msg.sender, address(this), _amount);

		bytes memory info = routeInfo.info;

		if (route == Route.UniswapV2) return _uniswapV2(_amount, _minReceived, info);
		if (route == Route.UniswapV3Direct) return _uniswapV3Direct(_tokenIn, _tokenOut, _amount, _minReceived, info);
		if (route == Route.UniswapV3Path) return _uniswapV3Path(_amount, _minReceived, info);
		if (route == Route.SushiSwap) return _sushiswap(_amount, _minReceived, info);

		revert UnsupportedRoute(_tokenIn, _tokenOut);
	}

	/*///////////////////////////////////////////
	/      Restricted Functions: onlyOwner      /
	///////////////////////////////////////////*/

	function setRoute(
		address _tokenIn,
		address _tokenOut,
		RouteInfo memory _routeInfo
	) external onlyOwner {
		_setRoute(_tokenIn, _tokenOut, _routeInfo);
	}

	function unsetRoute(address _tokenIn, address _tokenOut) external onlyOwner {
		delete routes[_tokenIn][_tokenOut];
		emit RouteRemoved(_tokenIn, _tokenOut);
	}

	/*//////////////////////////////
	/      Internal Functions      /
	//////////////////////////////*/

	function _setRoute(
		address _tokenIn,
		address _tokenOut,
		RouteInfo memory _routeInfo
	) internal {
		Route route = _routeInfo.route;
		bytes memory info = _routeInfo.info;

		if (route == Route.UniswapV2 || route == Route.SushiSwap) {
			address[] memory path = abi.decode(info, (address[]));

			if (path[0] != _tokenIn) revert InvalidRouteInfo();
			if (path[path.length - 1] != _tokenOut) revert InvalidRouteInfo();
		}

		if (route == Route.UniswapV3Direct) {
			// just check that this doesn't throw an error
			abi.decode(info, (uint24));
		}

		if (route == Route.UniswapV3Path) {
			bytes memory path = info;

			// check first tokenIn
			(address tokenIn, , ) = path.decodeFirstPool();
			if (tokenIn != _tokenIn) revert InvalidRouteInfo();

			// check last tokenOut
			while (path.hasMultiplePools()) path = path.skipToken();
			(, address tokenOut, ) = path.decodeFirstPool();
			if (tokenOut != _tokenOut) revert InvalidRouteInfo();
		}

		address router = route == Route.SushiSwap ? address(sushiswap) : address(uniswap);
		ERC20(_tokenIn).safeApprove(router, 0);
		ERC20(_tokenIn).safeApprove(router, type(uint256).max);

		routes[_tokenIn][_tokenOut] = _routeInfo;
		emit RouteSet(_tokenIn, _tokenOut, _routeInfo);
	}

	function _uniswapV2(
		uint256 _amount,
		uint256 _minReceived,
		bytes memory _path
	) internal returns (uint256) {
		address[] memory path = abi.decode(_path, (address[]));

		return uniswap.swapExactTokensForTokens(_amount, _minReceived, path, msg.sender);
	}

	function _sushiswap(
		uint256 _amount,
		uint256 _minReceived,
		bytes memory _path
	) internal returns (uint256) {
		address[] memory path = abi.decode(_path, (address[]));

		uint256[] memory received = sushiswap.swapExactTokensForTokens(
			_amount,
			_minReceived,
			path,
			msg.sender,
			block.timestamp + 30 minutes
		);

		return received[received.length - 1];
	}

	function _uniswapV3Direct(
		address _tokenIn,
		address _tokenOut,
		uint256 _amount,
		uint256 _minReceived,
		bytes memory info
	) internal returns (uint256) {
		uint24 fee = abi.decode(info, (uint24));

		return
			uniswap.exactInputSingle(
				ISwapRouter02.ExactInputSingleParams({
					tokenIn: _tokenIn,
					tokenOut: _tokenOut,
					fee: fee,
					recipient: msg.sender,
					amountIn: _amount,
					amountOutMinimum: _minReceived,
					sqrtPriceLimitX96: 0
				})
			);
	}

	function _uniswapV3Path(
		uint256 _amount,
		uint256 _minReceived,
		bytes memory path
	) internal returns (uint256) {
		return
			uniswap.exactInput(
				ISwapRouter02.ExactInputParams({
					path: path,
					recipient: msg.sender,
					amountIn: _amount,
					amountOutMinimum: _minReceived
				})
			);
	}
}

// File: src/Vault.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

import 'solmate/tokens/ERC20.sol';
import 'solmate/utils/SafeTransferLib.sol';
import 'solmate/utils/FixedPointMathLib.sol';

import './libraries/Ownership.sol';
import './libraries/BlockDelay.sol';
import './interfaces/IERC4626.sol';
import './Strategy.sol';

contract Vault is ERC20, IERC4626, Ownership, BlockDelay {
	using SafeTransferLib for ERC20;
	using FixedPointMathLib for uint256;

	/// @notice token which the vault uses and accumulates
	ERC20 public immutable asset;

	/// @notice whether deposits and withdrawals are paused
	bool public paused;

	uint256 private _lockedProfit;
	/// @notice timestamp of last report, used for locked profit calculations
	uint256 public lastReport;
	/// @notice period over which profits are gradually unlocked, defense against sandwich attacks
	uint256 public lockedProfitDuration = 24 hours;
	uint256 internal constant MAX_LOCKED_PROFIT_DURATION = 3 days;

	/// @dev maximum user can deposit in a single tx
	uint256 private _maxDeposit = type(uint256).max;

	struct StrategyParams {
		bool added;
		uint256 debt;
		uint256 debtRatio;
	}

	Strategy[] private _queue;
	mapping(Strategy => StrategyParams) public strategies;

	uint8 internal constant MAX_QUEUE_LENGTH = 20;

	uint256 public totalDebt;
	/// @dev proportion of funds kept in vault to facilitate user withdrawals
	uint256 public floatDebtRatio;
	uint256 public totalDebtRatio;
	uint256 internal constant MAX_TOTAL_DEBT_RATIO = 1_000;

	/*//////////////////
	/      Events      /
	//////////////////*/

	event Report(Strategy indexed strategy, uint256 harvested, uint256 gain, uint256 loss);
	event Lend(Strategy indexed strategy, uint256 assets, uint256 slippage);
	event Collect(Strategy indexed strategy, uint256 received, uint256 slippage, uint256 bonus);

	event StrategyAdded(Strategy indexed strategy, uint256 debtRatio);
	event StrategyDebtRatioChanged(Strategy indexed strategy, uint256 newDebtRatio);
	event StrategyRemoved(Strategy indexed strategy);
	event StrategyQueuePositionsSwapped(uint8 i, uint8 j, Strategy indexed newI, Strategy indexed newJ);

	event LockedProfitDurationChanged(uint256 newDuration);
	event MaxDepositChanged(uint256 newMaxDeposit);
	event FloatDebtRatioChanged(uint256 newFloatDebtRatio);

	/*//////////////////
	/      Errors      /
	//////////////////*/

	error Zero();
	error BelowMinimum(uint256);
	error AboveMaximum(uint256);

	error AboveMaxDeposit();

	error AlreadyStrategy();
	error NotStrategy();
	error StrategyDoesNotBelongToQueue();
	error StrategyQueueFull();

	error AlreadyValue();

	error Paused();

	/// @dev e.g. USDC becomes 'Unagii USD Coin Vault v3' and 'uUSDCv3'
	constructor(
		ERC20 _asset,
		uint8 _blockDelay,
		uint256 _floatDebtRatio,
		address _nominatedOwner,
		address _admin,
		address[] memory _authorized
	)
		ERC20(
			string(abi.encodePacked('Unagii ', _asset.name(), ' Vault v3')),
			string(abi.encodePacked('u', _asset.symbol(), 'v3')),
			_asset.decimals()
		)
		Ownership(_nominatedOwner, _admin, _authorized)
		BlockDelay(_blockDelay)
	{
		asset = _asset;
		_setFloatDebtRatio(_floatDebtRatio);
	}

	/*///////////////////////
	/      Public View      /
	///////////////////////*/

	function queue() external view returns (Strategy[] memory) {
		return _queue;
	}

	function totalAssets() public view returns (uint256 assets) {
		return asset.balanceOf(address(this)) + totalDebt;
	}

	function lockedProfit() public view returns (uint256 lockedAssets) {
		uint256 last = lastReport;
		uint256 duration = lockedProfitDuration;

		unchecked {
			// won't overflow since time is nowhere near uint256.max
			if (block.timestamp >= last + duration) return 0;
			// can overflow if _lockedProfit * difference > uint256.max but in practice should never happen
			return _lockedProfit - _lockedProfit.mulDivDown(block.timestamp - last, duration);
		}
	}

	function freeAssets() public view returns (uint256 assets) {
		return totalAssets() - lockedProfit();
	}

	function convertToShares(uint256 _assets) public view returns (uint256 shares) {
		uint256 supply = totalSupply;
		return supply == 0 ? _assets : _assets.mulDivDown(supply, totalAssets());
	}

	function convertToAssets(uint256 _shares) public view returns (uint256 assets) {
		uint256 supply = totalSupply;
		return supply == 0 ? _shares : _shares.mulDivDown(totalAssets(), supply);
	}

	function maxDeposit(address) external view returns (uint256 assets) {
		return _maxDeposit;
	}

	function previewDeposit(uint256 _assets) public view returns (uint256 shares) {
		return convertToShares(_assets);
	}

	function maxMint(address) external view returns (uint256 shares) {
		return convertToShares(_maxDeposit);
	}

	function previewMint(uint256 shares) public view returns (uint256 assets) {
		uint256 supply = totalSupply;
		return supply == 0 ? shares : shares.mulDivUp(totalAssets(), supply);
	}

	function maxWithdraw(address owner) external view returns (uint256 assets) {
		return convertToAssets(balanceOf[owner]);
	}

	function previewWithdraw(uint256 assets) public view returns (uint256 shares) {
		uint256 supply = totalSupply;

		return supply == 0 ? assets : assets.mulDivUp(supply, freeAssets());
	}

	function maxRedeem(address _owner) external view returns (uint256 shares) {
		return balanceOf[_owner];
	}

	function previewRedeem(uint256 shares) public view returns (uint256 assets) {
		uint256 supply = totalSupply;
		return supply == 0 ? shares : shares.mulDivDown(freeAssets(), supply);
	}

	/*////////////////////////////
	/      Public Functions      /
	////////////////////////////*/

	function safeDeposit(
		uint256 _assets,
		address _receiver,
		uint256 _minShares
	) external returns (uint256 shares) {
		shares = deposit(_assets, _receiver);
		if (shares < _minShares) revert BelowMinimum(shares);
	}

	function safeMint(
		uint256 _shares,
		address _receiver,
		uint256 _maxAssets
	) external returns (uint256 assets) {
		assets = mint(_shares, _receiver);
		if (assets > _maxAssets) revert AboveMaximum(assets);
	}

	function safeWithdraw(
		uint256 _assets,
		address _receiver,
		address _owner,
		uint256 _maxShares
	) external returns (uint256 shares) {
		shares = withdraw(_assets, _receiver, _owner);
		if (shares > _maxShares) revert AboveMaximum(shares);
	}

	function safeRedeem(
		uint256 _shares,
		address _receiver,
		address _owner,
		uint256 _minAssets
	) external returns (uint256 assets) {
		assets = redeem(_shares, _receiver, _owner);
		if (assets < _minAssets) revert BelowMinimum(assets);
	}

	/*////////////////////////////////////
	/      ERC4626 Public Functions      /
	////////////////////////////////////*/

	function deposit(uint256 _assets, address _receiver) public whenNotPaused returns (uint256 shares) {
		if ((shares = previewDeposit(_assets)) == 0) revert Zero();

		_deposit(_assets, shares, _receiver);
	}

	function mint(uint256 _shares, address _receiver) public whenNotPaused returns (uint256 assets) {
		if (_shares == 0) revert Zero();
		assets = previewMint(_shares);

		_deposit(assets, _shares, _receiver);
	}

	function withdraw(
		uint256 _assets,
		address _receiver,
		address _owner
	) public returns (uint256 shares) {
		if (_assets == 0) revert Zero();
		shares = previewWithdraw(_assets);

		_withdraw(_assets, shares, _owner, _receiver);
	}

	function redeem(
		uint256 _shares,
		address _receiver,
		address _owner
	) public returns (uint256 assets) {
		if ((assets = previewRedeem(_shares)) == 0) revert Zero();

		return _withdraw(assets, _shares, _owner, _receiver);
	}

	/*///////////////////////////////////////////
	/      Restricted Functions: onlyOwner      /
	///////////////////////////////////////////*/

	function addStrategy(Strategy _strategy, uint256 _debtRatio) external onlyOwner {
		if (_strategy.vault() != this) revert StrategyDoesNotBelongToQueue();
		if (strategies[_strategy].added) revert AlreadyStrategy();
		if (_queue.length >= MAX_QUEUE_LENGTH) revert StrategyQueueFull();

		totalDebtRatio += _debtRatio;
		if (totalDebtRatio > MAX_TOTAL_DEBT_RATIO) revert AboveMaximum(totalDebtRatio);

		strategies[_strategy] = StrategyParams({added: true, debt: 0, debtRatio: _debtRatio});
		_queue.push(_strategy);

		emit StrategyAdded(_strategy, _debtRatio);
	}

	/*////////////////////////////////////////////
	/      Restricted Functions: onlyAdmins      /
	////////////////////////////////////////////*/

	function removeStrategy(
		Strategy _strategy,
		bool _shouldHarvest,
		uint256 _minReceived
	) external onlyAdmins returns (uint256 received) {
		if (!strategies[_strategy].added) revert NotStrategy();

		_setDebtRatio(_strategy, 0);

		uint256 balanceBefore = asset.balanceOf(address(this));

		if (_shouldHarvest) _harvest(_strategy);
		else _report(_strategy, 0);

		received = asset.balanceOf(address(this)) - balanceBefore;

		if (received < _minReceived) revert BelowMinimum(received);

		// reorganize queue, filling in the empty strategy
		Strategy[] memory newQueue = new Strategy[](_queue.length - 1);

		bool found;
		uint8 length = uint8(newQueue.length);
		for (uint8 i = 0; i < length; ++i) {
			if (_queue[i] == _strategy) found = true;

			if (found) newQueue[i] = _queue[i + 1];
			else newQueue[i] = _queue[i];
		}

		delete strategies[_strategy];
		_queue = newQueue;

		emit StrategyRemoved(_strategy);
	}

	function swapQueuePositions(uint8 _i, uint8 _j) external onlyAdmins {
		Strategy s1 = _queue[_i];
		Strategy s2 = _queue[_j];

		_queue[_i] = s2;
		_queue[_j] = s1;

		emit StrategyQueuePositionsSwapped(_i, _j, s2, s1);
	}

	function setDebtRatio(Strategy _strategy, uint256 _newDebtRatio) external onlyAdmins {
		if (!strategies[_strategy].added) revert NotStrategy();
		_setDebtRatio(_strategy, _newDebtRatio);
	}

	/// @dev locked profit duration can be 0
	function setLockedProfitDuration(uint256 _newDuration) external onlyAdmins {
		if (_newDuration > MAX_LOCKED_PROFIT_DURATION) revert AboveMaximum(_newDuration);
		if (_newDuration == lockedProfitDuration) revert AlreadyValue();
		lockedProfitDuration = _newDuration;
		emit LockedProfitDurationChanged(_newDuration);
	}

	function setBlockDelay(uint8 _newDelay) external onlyAdmins {
		_setBlockDelay(_newDelay);
	}

	/*///////////////////////////////////////////////
	/      Restricted Functions: onlyAuthorized     /
	///////////////////////////////////////////////*/

	function suspendStrategy(Strategy _strategy) external onlyAuthorized {
		if (!strategies[_strategy].added) revert NotStrategy();
		_setDebtRatio(_strategy, 0);
	}

	function collectFromStrategy(
		Strategy _strategy,
		uint256 _assets,
		uint256 _minReceived
	) external onlyAuthorized returns (uint256 received) {
		if (!strategies[_strategy].added) revert NotStrategy();
		(received, ) = _collect(_strategy, _assets, address(this));
		if (received < _minReceived) revert BelowMinimum(received);
	}

	function pause() external onlyAuthorized {
		if (paused) revert AlreadyValue();
		paused = true;
	}

	function unpause() external onlyAuthorized {
		if (!paused) revert AlreadyValue();
		paused = false;
	}

	function setMaxDeposit(uint256 _newMaxDeposit) external onlyAuthorized {
		if (_maxDeposit == _newMaxDeposit) revert AlreadyValue();
		_maxDeposit = _newMaxDeposit;
		emit MaxDepositChanged(_newMaxDeposit);
	}

	/// @dev costs less gas than multiple harvests if active strategies > 1
	function harvestAll() external onlyAuthorized updateLastReport {
		uint8 length = uint8(_queue.length);
		for (uint8 i = 0; i < length; ++i) {
			_harvest(_queue[i]);
		}
	}

	/// @dev costs less gas than multiple reports if active strategies > 1
	function reportAll() external onlyAuthorized updateLastReport {
		uint8 length = uint8(_queue.length);
		for (uint8 i = 0; i < length; ++i) {
			_report(_queue[i], 0);
		}
	}

	function harvest(Strategy _strategy) external onlyAuthorized updateLastReport {
		if (!strategies[_strategy].added) revert NotStrategy();

		_harvest(_strategy);
	}

	function report(Strategy _strategy) external onlyAuthorized updateLastReport {
		if (!strategies[_strategy].added) revert NotStrategy();

		_report(_strategy, 0);
	}

	function setFloatDebtRatio(uint256 _floatDebtRatio) external onlyAuthorized {
		_setFloatDebtRatio(_floatDebtRatio);
	}

	/*///////////////////////////////////////////
	/      Internal Override: useBlockDelay     /
	///////////////////////////////////////////*/

	/// @dev address cannot mint/burn/send/receive share tokens on same block, defense against flash loan exploits
	function _mint(address _to, uint256 _amount) internal override useBlockDelay(_to) {
		if (_to == address(0)) revert Zero();
		ERC20._mint(_to, _amount);
	}

	/// @dev address cannot mint/burn/send/receive share tokens on same block, defense against flash loan exploits
	function _burn(address _from, uint256 _amount) internal override useBlockDelay(_from) {
		ERC20._burn(_from, _amount);
	}

	/// @dev address cannot mint/burn/send/receive share tokens on same block, defense against flash loan exploits
	function transfer(address _to, uint256 _amount)
		public
		override
		useBlockDelay(msg.sender)
		useBlockDelay(_to)
		returns (bool)
	{
		return ERC20.transfer(_to, _amount);
	}

	/// @dev address cannot mint/burn/send/receive share tokens on same block, defense against flash loan exploits
	function transferFrom(
		address _from,
		address _to,
		uint256 _amount
	) public override useBlockDelay(_from) useBlockDelay(_to) returns (bool) {
		return ERC20.transferFrom(_from, _to, _amount);
	}

	/*//////////////////////////////
	/      Internal Functions      /
	//////////////////////////////*/

	function _deposit(
		uint256 _assets,
		uint256 _shares,
		address _receiver
	) internal {
		if (_assets > _maxDeposit) revert AboveMaxDeposit();

		asset.safeTransferFrom(msg.sender, address(this), _assets);
		_mint(_receiver, _shares);
		emit Deposit(msg.sender, _receiver, _assets, _shares);
	}

	function _withdraw(
		uint256 _assets,
		uint256 _shares,
		address _owner,
		address _receiver
	) internal returns (uint256 received) {
		if (msg.sender != _owner) {
			uint256 allowed = allowance[_owner][msg.sender];
			if (allowed != type(uint256).max) allowance[_owner][msg.sender] = allowed - _shares;
		}

		_burn(_owner, _shares);

		emit Withdraw(msg.sender, _receiver, _owner, _assets, _shares);

		// first, withdraw from balance
		uint256 balance = asset.balanceOf(address(this));

		if (balance > 0) {
			uint256 amount = _assets > balance ? balance : _assets;
			asset.safeTransfer(_receiver, amount);
			_assets -= amount;
			received += amount;
		}

		// next, withdraw from strategies
		uint8 length = uint8(_queue.length);
		for (uint8 i = 0; i < length; ++i) {
			if (_assets == 0) break;
			(uint256 receivedFromStrategy, uint256 slippage) = _collect(_queue[i], _assets, _receiver);
			_assets -= receivedFromStrategy + slippage; // user pays for slippage, if any
			received += receivedFromStrategy;
		}
	}

	/// @dev do not touch debt outside of _lend(), _collect() and _report()
	function _lend(Strategy _strategy, uint256 _assets) internal {
		uint256 balance = asset.balanceOf(address(this));
		uint256 amount = _assets > balance ? balance : _assets;

		asset.safeTransfer(address(_strategy), amount);
		_strategy.invest();

		uint256 debtBefore = strategies[_strategy].debt;
		uint256 debtAfter = _strategy.totalAssets();

		uint256 diff = debtAfter - debtBefore;

		uint256 slippage = amount > diff ? amount - diff : 0;

		// ignore bonus if diff > amount, safeguard against imprecise `strategy.totalAsset()` calculations that open vault to being drained
		uint256 debt = amount - slippage;

		strategies[_strategy].debt += debt;
		totalDebt += debt;

		emit Lend(_strategy, amount, slippage);
	}

	function _collect(
		Strategy _strategy,
		uint256 _assets,
		address _receiver
	) internal returns (uint256 received, uint256 slippage) {
		uint256 bonus;
		(received, slippage, bonus) = _strategy.withdraw(_assets);

		uint256 total = received + slippage;

		uint256 debt = strategies[_strategy].debt;

		uint256 amount = debt > total ? received : total;

		strategies[_strategy].debt -= amount;
		totalDebt -= amount;

		// do not pass bonuses on to users withdrawing, prevents exploits draining vault
		if (_receiver == address(this)) emit Collect(_strategy, received, slippage, bonus);
		else asset.safeTransfer(_receiver, received);
	}

	function _harvest(Strategy _strategy) internal {
		_report(_strategy, _strategy.harvest());
	}

	/// @dev do not touch debt outside of _lend(), _collect() and _report()
	function _report(Strategy _strategy, uint256 _harvested) internal {
		uint256 assets = _strategy.totalAssets();
		uint256 debt = strategies[_strategy].debt;

		strategies[_strategy].debt = assets; // update debt

		uint256 gain;
		uint256 loss;

		uint256 lockedProfitBefore = lockedProfit();

		if (assets > debt) {
			unchecked {
				gain = assets - debt;
			}
			totalDebt += gain;

			_lockedProfit = lockedProfitBefore + gain + _harvested;
		} else if (debt > assets) {
			unchecked {
				loss = debt - assets;
				totalDebt -= loss;

				_lockedProfit = lockedProfitBefore + _harvested > loss ? lockedProfitBefore + _harvested - loss : 0;
			}
		}

		uint256 possibleDebt = totalDebtRatio == 0
			? 0
			: totalAssets().mulDivDown(strategies[_strategy].debtRatio, totalDebtRatio);

		if (possibleDebt > assets) _lend(_strategy, possibleDebt - assets);
		else if (assets > possibleDebt) _collect(_strategy, assets - possibleDebt, address(this));

		emit Report(_strategy, _harvested, gain, loss);
	}

	function _setDebtRatio(Strategy _strategy, uint256 _newDebtRatio) internal {
		uint256 currentDebtRatio = strategies[_strategy].debtRatio;
		if (_newDebtRatio == currentDebtRatio) revert AlreadyValue();

		uint256 newTotalDebtRatio = totalDebtRatio + _newDebtRatio - currentDebtRatio;
		if (newTotalDebtRatio > MAX_TOTAL_DEBT_RATIO) revert AboveMaximum(newTotalDebtRatio);

		strategies[_strategy].debtRatio = _newDebtRatio;
		totalDebtRatio = newTotalDebtRatio;

		emit StrategyDebtRatioChanged(_strategy, _newDebtRatio);
	}

	function _setFloatDebtRatio(uint256 _floatDebtRatio) internal {
		uint256 newTotalDebtRatio = totalDebtRatio + _floatDebtRatio - floatDebtRatio;
		if (newTotalDebtRatio > MAX_TOTAL_DEBT_RATIO) revert AboveMaximum(newTotalDebtRatio);

		floatDebtRatio = _floatDebtRatio;
		totalDebtRatio = newTotalDebtRatio;

		emit FloatDebtRatioChanged(_floatDebtRatio);
	}

	/*/////////////////////
	/      Modifiers      /
	/////////////////////*/

	modifier updateLastReport() {
		_;
		lastReport = block.timestamp;
	}

	modifier whenNotPaused() {
		if (paused) revert Paused();
		_;
	}
}

// File: src/external/convex/IBaseRewardPool.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

// https://docs.convexfinance.com/convexfinanceintegration/baserewardpool
// https://github.com/convex-eth/platform/blob/main/contracts/contracts/BaseRewardPool.sol

interface IBaseRewardPool {
	function balanceOf(address _account) external view returns (uint256);

	function getReward(address _account, bool _claimExtras) external returns (bool);

	function withdrawAndUnwrap(uint256 amount, bool claim) external returns (bool);
}

// File: src/external/convex/IBooster.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

interface IBooster {
	function poolInfo(uint256 _pid)
		external
		view
		returns (
			address lpToken,
			address token,
			address gauge,
			address crvRewards,
			address stash,
			bool shutdown
		);

	function deposit(
		uint256 _pid,
		uint256 _amount,
		bool _stake
	) external returns (bool);

	function withdraw(uint256 _pid, uint256 _amount) external returns (bool);
}

// File: src/external/curve/IStableSwapEth.sol



//SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

// https://etherscan.io/address/0xDC24316b9AE028F1497c275EB9192a3Ea0f67022#code

interface IStableSwapEth {
	function get_virtual_price() external view returns (uint256);

	function add_liquidity(uint256[2] memory amounts, uint256 min_mint_amount) external payable;

	function remove_liquidity_one_coin(
		uint256 token_amount,
		int128 i,
		uint256 min_amount
	) external;
}

// File: src/external/sushiswap/ISushiRouter.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

// https://etherscan.io/address/0xd9e1ce17f2641f24ae83637ab66a2cca9c378b9f
// it's actually a UniswapV2Router02 but renamed for clarity vs actual uniswap

interface ISushiRouter {
	function swapExactTokensForTokens(
		uint256 amountIn,
		uint256 amountOutMin,
		address[] calldata path,
		address to,
		uint256 deadline
	) external returns (uint256[] memory amounts);

	function swapExactTokensForETH(
		uint256 amountIn,
		uint256 amountOutMin,
		address[] calldata path,
		address to,
		uint256 deadline
	) external returns (uint256[] memory amounts);
}

// File: src/external/uniswap/ISwapRouter02.sol



//SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

// https://github.com/Uniswap/swap-router-contracts/blob/main/contracts/interfaces/ISwapRouter02.sol

interface ISwapRouter02 {
	function swapExactTokensForTokens(
		uint256 amountIn,
		uint256 amountOutMin,
		address[] calldata path,
		address to
	) external payable returns (uint256 amountOut);

	struct ExactInputSingleParams {
		address tokenIn;
		address tokenOut;
		uint24 fee;
		address recipient;
		uint256 amountIn;
		uint256 amountOutMinimum;
		uint160 sqrtPriceLimitX96;
	}

	/// @notice Swaps `amountIn` of one token for as much as possible of another token
	/// @dev Setting `amountIn` to 0 will cause the contract to look up its own balance,
	/// and swap the entire amount, enabling contracts to send tokens before calling this function.
	/// @param params The parameters necessary for the swap, encoded as `ExactInputSingleParams` in calldata
	/// @return amountOut The amount of the received token
	function exactInputSingle(ExactInputSingleParams calldata params) external payable returns (uint256 amountOut);

	struct ExactInputParams {
		bytes path;
		address recipient;
		uint256 amountIn;
		uint256 amountOutMinimum;
	}

	/// @notice Swaps `amountIn` of one token for as much as possible of another along the specified path
	/// @dev Setting `amountIn` to 0 will cause the contract to look up its own balance,
	/// and swap the entire amount, enabling contracts to send tokens before calling this function.
	/// @param params The parameters necessary for the multi-hop swap, encoded as `ExactInputParams` in calldata
	/// @return amountOut The amount of the received token
	function exactInput(ExactInputParams calldata params) external payable returns (uint256 amountOut);
}

// File: src/interfaces/IERC4626.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

import 'solmate/tokens/ERC20.sol';

/// @notice https://eips.ethereum.org/EIPS/eip-4626
interface IERC4626 {
	event Deposit(address indexed caller, address indexed owner, uint256 assets, uint256 shares);

	event Withdraw(
		address indexed caller,
		address indexed receiver,
		address indexed owner,
		uint256 assets,
		uint256 shares
	);

	function asset() external view returns (ERC20);

	function totalAssets() external view returns (uint256 assets);

	function convertToShares(uint256 assets) external view returns (uint256 shares);

	function convertToAssets(uint256 shares) external view returns (uint256 assets);

	function maxDeposit(address receiver) external view returns (uint256 assets);

	function previewDeposit(uint256 assets) external view returns (uint256 shares);

	function deposit(uint256 assets, address receiver) external returns (uint256 shares);

	function maxMint(address receiver) external view returns (uint256 shares);

	function previewMint(uint256 shares) external view returns (uint256 assets);

	function mint(uint256 shares, address receiver) external returns (uint256 assets);

	function maxWithdraw(address owner) external view returns (uint256 assets);

	function previewWithdraw(uint256 assets) external view returns (uint256 shares);

	function withdraw(
		uint256 assets,
		address receiver,
		address owner
	) external returns (uint256 shares);

	function maxRedeem(address owner) external view returns (uint256 shares);

	function previewRedeem(uint256 shares) external view returns (uint256 assets);

	function redeem(
		uint256 shares,
		address receiver,
		address owner
	) external returns (uint256 assets);
}

// File: src/libraries/BlockDelay.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

abstract contract BlockDelay {
	/// @notice delay before functions with 'useBlockDelay' can be called by the same address
	/// @dev 0 means no delay
	uint256 public blockDelay;
	uint256 internal constant MAX_BLOCK_DELAY = 10;

	mapping(address => uint256) public lastBlock;

	error AboveMaxBlockDelay();
	error BeforeBlockDelay();

	constructor(uint8 _delay) {
		_setBlockDelay(_delay);
	}

	function _setBlockDelay(uint8 _newDelay) internal {
		if (_newDelay > MAX_BLOCK_DELAY) revert AboveMaxBlockDelay();
		blockDelay = _newDelay;
	}

	modifier useBlockDelay(address _address) {
		if (block.number < lastBlock[_address] + blockDelay) revert BeforeBlockDelay();
		lastBlock[_address] = block.number;
		_;
	}
}

// File: src/libraries/BytesLib.sol



// SPDX-License-Identifier: Unlicense

//https://github.com/GNSPS/solidity-bytes-utils/blob/master/contracts/BytesLib.sol

pragma solidity >=0.8.0 <0.9.0;

library BytesLib {
	function slice(
		bytes memory _bytes,
		uint256 _start,
		uint256 _length
	) internal pure returns (bytes memory) {
		require(_length + 31 >= _length, 'slice_overflow');
		require(_bytes.length >= _start + _length, 'slice_outOfBounds');

		bytes memory tempBytes;

		assembly {
			switch iszero(_length)
			case 0 {
				// Get a location of some free memory and store it in tempBytes as
				// Solidity does for memory variables.
				tempBytes := mload(0x40)

				// The first word of the slice result is potentially a partial
				// word read from the original array. To read it, we calculate
				// the length of that partial word and start copying that many
				// bytes into the array. The first word we copy will start with
				// data we don't care about, but the last `lengthmod` bytes will
				// land at the beginning of the contents of the new array. When
				// we're done copying, we overwrite the full first word with
				// the actual length of the slice.
				let lengthmod := and(_length, 31)

				// The multiplication in the next line is necessary
				// because when slicing multiples of 32 bytes (lengthmod == 0)
				// the following copy loop was copying the origin's length
				// and then ending prematurely not copying everything it should.
				let mc := add(add(tempBytes, lengthmod), mul(0x20, iszero(lengthmod)))
				let end := add(mc, _length)

				for {
					// The multiplication in the next line has the same exact purpose
					// as the one above.
					let cc := add(add(add(_bytes, lengthmod), mul(0x20, iszero(lengthmod))), _start)
				} lt(mc, end) {
					mc := add(mc, 0x20)
					cc := add(cc, 0x20)
				} {
					mstore(mc, mload(cc))
				}

				mstore(tempBytes, _length)

				//update free-memory pointer
				//allocating the array padded to 32 bytes like the compiler does now
				mstore(0x40, and(add(mc, 31), not(31)))
			}
			//if we want a zero-length slice let's just return a zero-length array
			default {
				tempBytes := mload(0x40)
				//zero out the 32 bytes slice we are about to return
				//we need to do it because Solidity does not garbage collect
				mstore(tempBytes, 0)

				mstore(0x40, add(tempBytes, 0x20))
			}
		}

		return tempBytes;
	}

	function toAddress(bytes memory _bytes, uint256 _start) internal pure returns (address) {
		require(_bytes.length >= _start + 20, 'toAddress_outOfBounds');
		address tempAddress;

		assembly {
			tempAddress := div(mload(add(add(_bytes, 0x20), _start)), 0x1000000000000000000000000)
		}

		return tempAddress;
	}

	function toUint24(bytes memory _bytes, uint256 _start) internal pure returns (uint24) {
		require(_bytes.length >= _start + 3, 'toUint24_outOfBounds');
		uint24 tempUint;

		assembly {
			tempUint := mload(add(add(_bytes, 0x3), _start))
		}

		return tempUint;
	}
}

// File: src/libraries/Ownable.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

abstract contract Ownable {
	address public owner;
	address public nominatedOwner;

	error Unauthorized();

	event OwnerChanged(address indexed previousOwner, address indexed newOwner);

	constructor() {
		owner = msg.sender;
	}

	// Public Functions

	function acceptOwnership() external {
		if (msg.sender != nominatedOwner) revert Unauthorized();
		emit OwnerChanged(owner, msg.sender);
		owner = msg.sender;
		nominatedOwner = address(0);
	}

	// Restricted Functions: onlyOwner

	/// @dev nominating zero address revokes a pending nomination
	function nominateOwnership(address _newOwner) external onlyOwner {
		nominatedOwner = _newOwner;
	}

	// Modifiers

	modifier onlyOwner() {
		if (msg.sender != owner) revert Unauthorized();
		_;
	}
}

// File: src/libraries/Ownership.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

abstract contract Ownership {
	address public owner;
	address public nominatedOwner;

	address public admin;

	mapping(address => bool) public authorized;

	event OwnerChanged(address indexed previousOwner, address indexed newOwner);
	event AuthAdded(address indexed newAuth);
	event AuthRemoved(address indexed oldAuth);

	error Unauthorized();
	error AlreadyRole();
	error NotRole();

	/// @param _authorized maximum of 256 addresses in constructor
	constructor(
		address _nominatedOwner,
		address _admin,
		address[] memory _authorized
	) {
		owner = msg.sender;
		nominatedOwner = _nominatedOwner;
		admin = _admin;
		for (uint8 i = 0; i < _authorized.length; ++i) {
			authorized[_authorized[i]] = true;
			emit AuthAdded(_authorized[i]);
		}
	}

	// Public Functions

	function acceptOwnership() external {
		if (msg.sender != nominatedOwner) revert Unauthorized();
		emit OwnerChanged(owner, msg.sender);
		owner = msg.sender;
		nominatedOwner = address(0);
	}

	// Restricted Functions: onlyOwner

	/// @dev nominating zero address revokes a pending nomination
	function nominateOwnership(address _newOwner) external onlyOwner {
		nominatedOwner = _newOwner;
	}

	function setAdmin(address _newAdmin) external onlyOwner {
		if (admin == _newAdmin) revert AlreadyRole();
		admin = _newAdmin;
	}

	// Restricted Functions: onlyAdmins

	function addAuthorized(address _authorized) external onlyAdmins {
		if (authorized[_authorized]) revert AlreadyRole();
		authorized[_authorized] = true;
		emit AuthAdded(_authorized);
	}

	function removeAuthorized(address _authorized) external onlyAdmins {
		if (!authorized[_authorized]) revert NotRole();
		authorized[_authorized] = false;
		emit AuthRemoved(_authorized);
	}

	// Modifiers

	modifier onlyOwner() {
		if (msg.sender != owner) revert Unauthorized();
		_;
	}

	modifier onlyAdmins() {
		if (msg.sender != owner && msg.sender != admin) revert Unauthorized();
		_;
	}

	modifier onlyAuthorized() {
		if (msg.sender != owner && msg.sender != admin && !authorized[msg.sender]) revert Unauthorized();
		_;
	}
}

// File: src/libraries/Path.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.6.0;

// https://github.com/Uniswap/v3-periphery/blob/main/contracts/libraries/Path.sol

import './BytesLib.sol';

/// @title Functions for manipulating path data for multihop swaps
library Path {
	using BytesLib for bytes;

	/// @dev The length of the bytes encoded address
	uint256 private constant ADDR_SIZE = 20;
	/// @dev The length of the bytes encoded fee
	uint256 private constant FEE_SIZE = 3;

	/// @dev The offset of a single token address and pool fee
	uint256 private constant NEXT_OFFSET = ADDR_SIZE + FEE_SIZE;
	/// @dev The offset of an encoded pool key
	uint256 private constant POP_OFFSET = NEXT_OFFSET + ADDR_SIZE;
	/// @dev The minimum length of an encoding that contains 2 or more pools
	uint256 private constant MULTIPLE_POOLS_MIN_LENGTH = POP_OFFSET + NEXT_OFFSET;

	/// @notice Returns true iff the path contains two or more pools
	/// @param path The encoded swap path
	/// @return True if path contains two or more pools, otherwise false
	function hasMultiplePools(bytes memory path) internal pure returns (bool) {
		return path.length >= MULTIPLE_POOLS_MIN_LENGTH;
	}

	/// @notice Returns the number of pools in the path
	/// @param path The encoded swap path
	/// @return The number of pools in the path
	function numPools(bytes memory path) internal pure returns (uint256) {
		// Ignore the first token address. From then on every fee and token offset indicates a pool.
		return ((path.length - ADDR_SIZE) / NEXT_OFFSET);
	}

	/// @notice Decodes the first pool in path
	/// @param path The bytes encoded swap path
	/// @return tokenA The first token of the given pool
	/// @return tokenB The second token of the given pool
	/// @return fee The fee level of the pool
	function decodeFirstPool(bytes memory path)
		internal
		pure
		returns (
			address tokenA,
			address tokenB,
			uint24 fee
		)
	{
		tokenA = path.toAddress(0);
		fee = path.toUint24(ADDR_SIZE);
		tokenB = path.toAddress(NEXT_OFFSET);
	}

	/// @notice Gets the segment corresponding to the first pool in the path
	/// @param path The bytes encoded swap path
	/// @return The segment containing all data necessary to target the first pool in the path
	function getFirstPool(bytes memory path) internal pure returns (bytes memory) {
		return path.slice(0, POP_OFFSET);
	}

	/// @notice Skips a token + fee element from the buffer and returns the remainder
	/// @param path The swap path
	/// @return The remaining token + fee elements in the path
	function skipToken(bytes memory path) internal pure returns (bytes memory) {
		return path.slice(NEXT_OFFSET, path.length - NEXT_OFFSET);
	}
}

// File: src/strategies/WethStrategyConvexStEth.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.9;

import 'solmate/tokens/WETH.sol';
import '../external/convex/IBaseRewardPool.sol';
import '../external/convex/IBooster.sol';
import '../external/curve/IStableSwapEth.sol';
import '../Swap.sol';
import '../Strategy.sol';

contract WethStrategyConvexStEth is Strategy {
	using SafeTransferLib for ERC20;
	using FixedPointMathLib for uint256;

	/// @notice contract used to swap CRV/CVX rewards to ETH
	Swap public swap;

	/// @dev pid of stETH in Convex
	uint8 internal constant pid = 25;
	ERC20 private constant poolToken = ERC20(0x06325440D014e39736583c165C2963BA99fAf14E);
	IBaseRewardPool private constant reward = IBaseRewardPool(0x0A760466E1B4621579a82a39CB56Dda2F4E70f03);
	IStableSwapEth private constant pool = IStableSwapEth(0xDC24316b9AE028F1497c275EB9192a3Ea0f67022);
	IBooster private constant booster = IBooster(0xF403C135812408BFbE8713b5A23a04b3D48AAE31);

	ERC20 internal constant CRV = ERC20(0xD533a949740bb3306d119CC777fa900bA034cd52);
	ERC20 internal constant CVX = ERC20(0x4e3FBD56CD56c3e72c1403e103b45Db9da5B9D2B);
	ERC20 internal constant LDO = ERC20(0x5A98FcBEA516Cf06857215779Fd812CA3beF1B32);

	ERC20[3] public rewards = [CRV, CVX, LDO];
	bool public shouldClaimExtras = true;

	/// @dev index of WETH in pool (technically just ETH)
	int128 internal constant INDEX_OF_ASSET = 0;
	/// @dev offset pool.get_virtual_price()'s 18 decimals
	uint256 internal constant NORMALIZED_DECIMAL_OFFSET = 1e18;

	/*///////////////
	/     Errors    /
	///////////////*/

	error ClaimRewardsFailed();
	error WithdrawAndUnwrapFailed();
	error DepositFailed();

	error NothingToInvest();

	constructor(
		Vault _vault,
		address _treasury,
		address _nominatedOwner,
		address _admin,
		address[] memory _authorized,
		Swap _swap
	) Strategy(_vault, _treasury, _nominatedOwner, _admin, _authorized) {
		swap = _swap;

		_approve();
	}

	receive() external payable {}

	/*///////////////////////
	/      Public View      /
	///////////////////////*/

	function totalAssets() public view override returns (uint256 assets) {
		uint256 rewardBalance = reward.balanceOf(address(this));
		if (rewardBalance == 0) return assets;
		assets += rewardBalance.mulDivDown(pool.get_virtual_price(), NORMALIZED_DECIMAL_OFFSET);
	}

	/*///////////////////////////////////////////
	/      Restricted Functions: onlyOwner      /
	///////////////////////////////////////////*/

	function changeSwap(Swap _swap) external onlyOwner {
		_unapproveSwap();
		swap = _swap;
		_approveSwap();
	}

	/*////////////////////////////////////////////////
	/      Restricted Functions: onlyAuthorized      /
	////////////////////////////////////////////////*/

	function reapprove() external onlyAuthorized {
		_unapprove();
		_approve();
	}

	function setShouldClaimExtras(bool _shouldClaimExtras) external onlyAuthorized {
		if (shouldClaimExtras = _shouldClaimExtras) revert AlreadyValue();
		shouldClaimExtras = _shouldClaimExtras;
	}

	/*/////////////////////////////
	/      Internal Override      /
	/////////////////////////////*/

	function _withdraw(uint256 _assets) internal override returns (uint256 received) {
		uint256 tokenAmount = _assets.mulDivDown(reward.balanceOf(address(this)), totalAssets());

		if (!reward.withdrawAndUnwrap(tokenAmount, true)) revert WithdrawAndUnwrapFailed();

		uint256 balanceBefore = address(this).balance;
		pool.remove_liquidity_one_coin(tokenAmount, INDEX_OF_ASSET, _calculateSlippage(_assets));
		unchecked {
			// older curve pools lack return values
			received = address(this).balance - balanceBefore;
		}

		WETH(payable(address(asset))).deposit{value: received}();

		asset.safeTransfer(address(vault), received);
	}

	function _harvest() internal override {
		if (!reward.getReward(address(this), shouldClaimExtras)) revert ClaimRewardsFailed();

		uint8 length = uint8(rewards.length);
		for (uint8 i = 0; i < length; ++i) {
			ERC20 rewardToken = rewards[i];
			uint256 rewardBalance = rewardToken.balanceOf(address(this));

			if (rewardBalance == 0) continue;

			// send rewards to treasury
			if (fee > 0) {
				uint256 feeAmount = _calculateFee(rewardBalance);
				rewardToken.safeTransfer(treasury, feeAmount);
				rewardBalance -= feeAmount;
			}

			swap.swapTokens(address(rewardToken), address(asset), rewardBalance, 1);
		}
	}

	function _invest() internal override {
		uint256 assetBalance = asset.balanceOf(address(this));
		if (assetBalance == 0) revert NothingToInvest();

		uint256 virtualPrice = pool.get_virtual_price();

		uint256 min = _calculateSlippage(assetBalance.mulDivDown(NORMALIZED_DECIMAL_OFFSET, virtualPrice));

		WETH(payable(address(asset))).withdraw(assetBalance);

		pool.add_liquidity{value: assetBalance}([assetBalance, 0], min);

		uint256 poolTokens = poolToken.balanceOf(address(this));
		if (!booster.deposit(pid, poolTokens, true)) revert DepositFailed();
	}

	/*//////////////////////////////
	/      Internal Functions      /
	//////////////////////////////*/

	function _approve() internal {
		// approve deposit ETH into pool
		asset.safeApprove(address(pool), type(uint256).max);
		// approve deposit lpTokens into booster
		poolToken.safeApprove(address(booster), type(uint256).max);
		// approve withdraw lpTokens
		poolToken.safeApprove(address(pool), type(uint256).max);

		_approveSwap();
	}

	function _unapprove() internal {
		asset.safeApprove(address(pool), 0);
		poolToken.safeApprove(address(booster), 0);
		poolToken.safeApprove(address(pool), 0);

		_unapproveSwap();
	}

	// approve swap rewards to WETH
	function _unapproveSwap() internal {
		uint8 length = uint8(rewards.length);
		for (uint8 i = 0; i < length; ++i) {
			rewards[i].safeApprove(address(swap), 0);
		}
	}

	// approve swap rewards to WETH
	function _approveSwap() internal {
		uint8 length = uint8(rewards.length);
		for (uint8 i = 0; i < length; ++i) {
			rewards[i].safeApprove(address(swap), type(uint256).max);
		}
	}
}