// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.25;

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

/// @notice Provides a flexible and updatable auth pattern which is completely separate from application logic.
/// @author Modified by BadgerDAO to remove owner
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/auth/Auth.sol)
/// @author Modified from Dappsys (https://github.com/dapphub/ds-auth/blob/master/src/auth.sol)
contract AuthNoOwner {
    event AuthorityUpdated(address indexed user, Authority indexed newAuthority);

    Authority private _authority;
    bool private _authorityInitialized;

    modifier requiresAuth() virtual {
        require(isAuthorized(msg.sender, msg.sig), "Auth: UNAUTHORIZED");

        _;
    }

    function authority() public view returns (Authority) {
        return _authority;
    }

    function authorityInitialized() public view returns (bool) {
        return _authorityInitialized;
    }

    function isAuthorized(address user, bytes4 functionSig) internal view virtual returns (bool) {
        Authority auth = _authority; // Memoizing authority saves us a warm SLOAD, around 100 gas.

        // Checking if the caller is the owner only after calling the authority saves gas in most cases, but be
        // aware that this makes protected functions uncallable even to the owner if the authority is out of order.
        return (address(auth) != address(0) && auth.canCall(user, address(this), functionSig));
    }

    /// @notice Changed constructor to initialize to allow flexiblity of constructor vs initializer use
    /// @notice sets authorityInitiailzed flag to ensure only one use of
    function _initializeAuthority(address newAuthority) internal {
        require(address(_authority) == address(0), "Auth: authority is non-zero");
        require(!_authorityInitialized, "Auth: authority already initialized");

        _authority = Authority(newAuthority);
        _authorityInitialized = true;

        emit AuthorityUpdated(address(this), Authority(newAuthority));
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.25;

/// @notice A generic interface for a contract which provides authorization data to an Auth instance.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/auth/Auth.sol)
/// @author Modified from Dappsys (https://github.com/dapphub/ds-auth/blob/master/src/auth.sol)
interface Authority {
    function canCall(address user, address target, bytes4 functionSig) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// 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);
    }
}

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

import {ERC20} from "../tokens/ERC20.sol";
import {SafeTransferLib} from "../utils/SafeTransferLib.sol";
import {FixedPointMathLib} from "../utils/FixedPointMathLib.sol";

/// @notice Minimal ERC4626 tokenized Vault implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC4626.sol)
abstract contract ERC4626 is ERC20 {
    using SafeTransferLib for ERC20;
    using FixedPointMathLib for uint256;

    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    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
    );

    /*//////////////////////////////////////////////////////////////
                               IMMUTABLES
    //////////////////////////////////////////////////////////////*/

    ERC20 public immutable asset;

    constructor(
        ERC20 _asset,
        string memory _name,
        string memory _symbol
    ) ERC20(_name, _symbol, _asset.decimals()) {
        asset = _asset;
    }

    /*//////////////////////////////////////////////////////////////
                        DEPOSIT/WITHDRAWAL LOGIC
    //////////////////////////////////////////////////////////////*/

    function deposit(uint256 assets, address receiver) public virtual returns (uint256 shares) {
        // Check for rounding error since we round down in previewDeposit.
        require((shares = previewDeposit(assets)) != 0, "ZERO_SHARES");

        // Need to transfer before minting or ERC777s could reenter.
        asset.safeTransferFrom(msg.sender, address(this), assets);

        _mint(receiver, shares);

        emit Deposit(msg.sender, receiver, assets, shares);

        afterDeposit(assets, shares);
    }

    function mint(uint256 shares, address receiver) public virtual returns (uint256 assets) {
        assets = previewMint(shares); // No need to check for rounding error, previewMint rounds up.

        // Need to transfer before minting or ERC777s could reenter.
        asset.safeTransferFrom(msg.sender, address(this), assets);

        _mint(receiver, shares);

        emit Deposit(msg.sender, receiver, assets, shares);

        afterDeposit(assets, shares);
    }

    function withdraw(
        uint256 assets,
        address receiver,
        address owner
    ) public virtual returns (uint256 shares) {
        shares = previewWithdraw(assets); // No need to check for rounding error, previewWithdraw rounds up.

        if (msg.sender != owner) {
            uint256 allowed = allowance[owner][msg.sender]; // Saves gas for limited approvals.

            if (allowed != type(uint256).max) allowance[owner][msg.sender] = allowed - shares;
        }

        beforeWithdraw(assets, shares);

        _burn(owner, shares);

        emit Withdraw(msg.sender, receiver, owner, assets, shares);

        asset.safeTransfer(receiver, assets);
    }

    function redeem(
        uint256 shares,
        address receiver,
        address owner
    ) public virtual returns (uint256 assets) {
        if (msg.sender != owner) {
            uint256 allowed = allowance[owner][msg.sender]; // Saves gas for limited approvals.

            if (allowed != type(uint256).max) allowance[owner][msg.sender] = allowed - shares;
        }

        // Check for rounding error since we round down in previewRedeem.
        require((assets = previewRedeem(shares)) != 0, "ZERO_ASSETS");

        beforeWithdraw(assets, shares);

        _burn(owner, shares);

        emit Withdraw(msg.sender, receiver, owner, assets, shares);

        asset.safeTransfer(receiver, assets);
    }

    /*//////////////////////////////////////////////////////////////
                            ACCOUNTING LOGIC
    //////////////////////////////////////////////////////////////*/

    function totalAssets() public view virtual returns (uint256);

    function convertToShares(uint256 assets) public view virtual returns (uint256) {
        uint256 supply = totalSupply; // Saves an extra SLOAD if totalSupply is non-zero.

        return supply == 0 ? assets : assets.mulDivDown(supply, totalAssets());
    }

    function convertToAssets(uint256 shares) public view virtual returns (uint256) {
        uint256 supply = totalSupply; // Saves an extra SLOAD if totalSupply is non-zero.

        return supply == 0 ? shares : shares.mulDivDown(totalAssets(), supply);
    }

    function previewDeposit(uint256 assets) public view virtual returns (uint256) {
        return convertToShares(assets);
    }

    function previewMint(uint256 shares) public view virtual returns (uint256) {
        uint256 supply = totalSupply; // Saves an extra SLOAD if totalSupply is non-zero.

        return supply == 0 ? shares : shares.mulDivUp(totalAssets(), supply);
    }

    function previewWithdraw(uint256 assets) public view virtual returns (uint256) {
        uint256 supply = totalSupply; // Saves an extra SLOAD if totalSupply is non-zero.

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

    function previewRedeem(uint256 shares) public view virtual returns (uint256) {
        return convertToAssets(shares);
    }

    /*//////////////////////////////////////////////////////////////
                     DEPOSIT/WITHDRAWAL LIMIT LOGIC
    //////////////////////////////////////////////////////////////*/

    function maxDeposit(address) public view virtual returns (uint256) {
        return type(uint256).max;
    }

    function maxMint(address) public view virtual returns (uint256) {
        return type(uint256).max;
    }

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

    function maxRedeem(address owner) public view virtual returns (uint256) {
        return balanceOf[owner];
    }

    /*//////////////////////////////////////////////////////////////
                          INTERNAL HOOKS LOGIC
    //////////////////////////////////////////////////////////////*/

    function beforeWithdraw(uint256 assets, uint256 shares) internal virtual {}

    function afterDeposit(uint256 assets, uint256 shares) internal virtual {}
}

// 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))
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 */
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: AGPL-3.0-only
pragma solidity 0.8.25;

// ====================================================================
// |     ______                   _______                             |
// |    / _____________ __  __   / ____(_____  ____ _____  ________   |
// |   / /_  / ___/ __ `| |/_/  / /_  / / __ \/ __ `/ __ \/ ___/ _ \  |
// |  / __/ / /  / /_/ _>  <   / __/ / / / / / /_/ / / / / /__/  __/  |
// | /_/   /_/   \__,_/_/|_|  /_/   /_/_/ /_/\__,_/_/ /_/\___/\___/   |
// |                                                                  |
// ====================================================================
// ======================== LinearRewardsErc4626 ======================
// ====================================================================
// Frax Finance: https://github.com/FraxFinance

import { ERC20, ERC4626 } from "@solmate/tokens/ERC4626.sol";
import { SafeCastLib } from "@solmate/utils/SafeCastLib.sol";
import { SafeTransferLib } from "@solmate/utils/SafeTransferLib.sol";

/// @title LinearRewardsErc4626
/// @notice An ERC4626 Vault implementation with linear rewards
abstract contract LinearRewardsErc4626 is ERC4626 {
    using SafeCastLib for *;
    using SafeTransferLib for ERC20;

    event SetMintingFee(uint256 oldMintingFee, uint256 newMintingFee);

    event FeeTaken(address indexed recipient, uint256 feeAmount);

    /// @notice max minting fee 10%
    uint256 public constant MAX_MINTING_FEE = 1e7;

    /// @notice Fee precision, 1e8 = 100%
    uint256 public constant FEE_PRECISION = 1e8;

    /// @notice The precision of all integer calculations
    uint256 public constant PRECISION = 1e18;

    /// @notice The rewards cycle length in seconds
    uint256 public immutable REWARDS_CYCLE_LENGTH;

    /// @notice Fee recipient address
    address public immutable FEE_RECIPIENT;

    /// @notice Information about the current rewards cycle
    struct RewardsCycleData {
        uint40 cycleEnd; // Timestamp of the end of the current rewards cycle
        uint40 lastSync; // Timestamp of the last time the rewards cycle was synced
        uint192 rewardCycleAmount; // Amount of rewards to be distributed in the current cycle
    }

    /// @notice The rewards cycle data, stored in a single word to save gas
    /// @notice calculateRewardsToDistribute should be used to get rewardCycleAmount
    /// because of maxDistributionPerSecondPerAsset
    RewardsCycleData public rewardsCycleData;

    /// @notice The timestamp of the last time rewards were distributed
    uint256 public lastRewardsDistribution;

    /// @notice The total amount of assets that have been distributed and deposited
    uint256 public storedTotalAssets;

    /// @notice The total amount of assets including recent donations
    uint256 public totalBalance;

    /// @notice The amount of minting fee in FEE_PRECISION
    uint256 public mintingFee;

    /// @notice The precision of the underlying asset
    uint256 public immutable UNDERLYING_PRECISION;

    /// @param _underlying The erc20 asset deposited
    /// @param _name The name of the vault
    /// @param _symbol The symbol of the vault
    /// @param _rewardsCycleLength The length of the rewards cycle in seconds
    constructor(
        ERC20 _underlying,
        string memory _name,
        string memory _symbol,
        uint256 _rewardsCycleLength,
        address _feeRecipient
    ) ERC4626(_underlying, _name, _symbol) {
        require(_feeRecipient != address(0));

        REWARDS_CYCLE_LENGTH = _rewardsCycleLength;
        UNDERLYING_PRECISION = 10 ** _underlying.decimals();
        FEE_RECIPIENT = _feeRecipient;

        // initialize rewardsCycleEnd value
        // NOTE: normally distribution of rewards should be done prior to _syncRewards but in this case we know there are no users or rewards yet.
        _syncRewards();

        // initialize lastRewardsDistribution value
        _distributeRewards();
    }

    function _setMintingFee(uint256 _mintingFee) internal {
        require(_mintingFee <= MAX_MINTING_FEE, "max minting fee");
        emit SetMintingFee(mintingFee, _mintingFee);
        mintingFee = _mintingFee;
    }

    function pricePerShare() external view returns (uint256 _pricePerShare) {
        _pricePerShare = convertToAssets(UNDERLYING_PRECISION);
    }

    /// @notice The ```calculateRewardsToDistribute``` function calculates the amount of rewards to distribute based on the rewards cycle data and the time elapsed
    /// @param _rewardsCycleData The rewards cycle data
    /// @param _deltaTime The time elapsed since the last rewards distribution
    /// @return _rewardToDistribute The amount of rewards to distribute
    function calculateRewardsToDistribute(
        RewardsCycleData memory _rewardsCycleData,
        uint256 _deltaTime
    ) public view virtual returns (uint256 _rewardToDistribute) {
        _rewardToDistribute =
            (_rewardsCycleData.rewardCycleAmount * _deltaTime) /
            (_rewardsCycleData.cycleEnd - _rewardsCycleData.lastSync);
    }

    /// @notice The ```previewDistributeRewards``` function is used to preview the rewards distributed at the top of the block
    /// @return _rewardToDistribute The amount of underlying to distribute
    function previewDistributeRewards() public view virtual returns (uint256 _rewardToDistribute) {
        // Cache state for gas savings
        RewardsCycleData memory _rewardsCycleData = rewardsCycleData;
        uint256 _lastRewardsDistribution = lastRewardsDistribution;
        uint40 _timestamp = block.timestamp.safeCastTo40();

        // Calculate the delta time, but only include up to the cycle end in case we are passed it
        uint256 _deltaTime = _timestamp > _rewardsCycleData.cycleEnd
            ? _rewardsCycleData.cycleEnd - _lastRewardsDistribution
            : _timestamp - _lastRewardsDistribution;

        // Calculate the rewards to distribute
        _rewardToDistribute = calculateRewardsToDistribute({
            _rewardsCycleData: _rewardsCycleData,
            _deltaTime: _deltaTime
        });
    }

    /// @notice The ```distributeRewards``` function distributes the rewards once per block
    /// @return _rewardToDistribute The amount of underlying to distribute
    function _distributeRewards() internal virtual returns (uint256 _rewardToDistribute) {
        _rewardToDistribute = previewDistributeRewards();

        // Only write to state/emit if we actually distribute rewards
        if (_rewardToDistribute != 0) {
            storedTotalAssets += _rewardToDistribute;
            emit DistributeRewards({ rewardsToDistribute: _rewardToDistribute });
        }

        lastRewardsDistribution = block.timestamp;
    }

    /// @notice The ```previewSyncRewards``` function returns the updated rewards cycle data without updating the state
    /// @return _newRewardsCycleData The updated rewards cycle data
    function previewSyncRewards() public view virtual returns (RewardsCycleData memory _newRewardsCycleData) {
        RewardsCycleData memory _rewardsCycleData = rewardsCycleData;

        uint256 _timestamp = block.timestamp;

        // Only sync if the previous cycle has ended
        if (_timestamp <= _rewardsCycleData.cycleEnd) return _rewardsCycleData;

        // Calculate rewards for next cycle
        uint256 _newRewards = totalBalance - storedTotalAssets;

        // Calculate the next cycle end, this keeps cycles at the same time regardless of when sync is called
        uint40 _cycleEnd = (((_timestamp + REWARDS_CYCLE_LENGTH) / REWARDS_CYCLE_LENGTH) * REWARDS_CYCLE_LENGTH)
            .safeCastTo40();

        // This block prevents big jumps in rewards rate in case the sync happens near the end of the cycle
        if (_cycleEnd - _timestamp < REWARDS_CYCLE_LENGTH / 40) {
            _cycleEnd += REWARDS_CYCLE_LENGTH.safeCastTo40();
        }

        // Write return values
        _rewardsCycleData.rewardCycleAmount = _newRewards.safeCastTo192();
        _rewardsCycleData.lastSync = _timestamp.safeCastTo40();
        _rewardsCycleData.cycleEnd = _cycleEnd;

        return _rewardsCycleData;
    }

    /// @notice The ```_syncRewards``` function is used to update the rewards cycle data
    function _syncRewards() internal virtual {
        RewardsCycleData memory _rewardsCycleData = previewSyncRewards();

        if (
            block
                .timestamp
                // If true, then preview shows a rewards should be processed
                .safeCastTo40() ==
            _rewardsCycleData.lastSync &&
            // Ensures that we don't write to state twice in the same block
            rewardsCycleData.lastSync != _rewardsCycleData.lastSync
        ) {
            rewardsCycleData = _rewardsCycleData;
            emit SyncRewards({
                cycleEnd: _rewardsCycleData.cycleEnd,
                lastSync: _rewardsCycleData.lastSync,
                rewardCycleAmount: _rewardsCycleData.rewardCycleAmount
            });
        }
    }

    /// @notice The ```syncRewardsAndDistribution``` function is used to update the rewards cycle data and distribute rewards
    /// @dev rewards must be distributed before the cycle is synced
    function syncRewardsAndDistribution() public virtual {
        _distributeRewards();
        _syncRewards();
    }

    /// @notice The ```totalAssets``` function returns the total assets available in the vault
    /// @dev This function simulates the rewards that will be distributed at the top of the block
    /// @return _totalAssets The total assets available in the vault
    function totalAssets() public view virtual override returns (uint256 _totalAssets) {
        uint256 _rewardToDistribute = previewDistributeRewards();
        _totalAssets = storedTotalAssets + _rewardToDistribute;
    }

    function afterDeposit(uint256 amount, uint256 shares) internal virtual override {
        storedTotalAssets += amount;
        totalBalance += amount;
    }

    function _computeFeeRaw(uint256 _assets) private view returns (uint256) {
        return _assets * mintingFee / FEE_PRECISION;
    }

    function _computeFeeTotal(uint256 _assets) private view returns (uint256) {
        return (_assets * mintingFee) / (mintingFee + FEE_PRECISION);
    }

    function _takeFee(uint256 _feeAmount) private {
        if (_feeAmount > 0) {
            asset.safeTransferFrom(msg.sender, FEE_RECIPIENT, _feeAmount);
            emit FeeTaken(FEE_RECIPIENT, _feeAmount);
        }
    }

    function previewDeposit(uint256 _assets) public view override returns (uint256) {
        uint256 feeAmount = _computeFeeTotal(_assets);
        return super.previewDeposit(_assets - feeAmount);
    }
    
    /// @notice The ```deposit``` function allows a user to mint shares by depositing underlying
    /// @param _assets The amount of underlying to deposit
    /// @param _receiver The address to send the shares to
    /// @return _shares The amount of shares minted
    function deposit(uint256 _assets, address _receiver) public override returns (uint256 _shares) {
        syncRewardsAndDistribution();

        uint256 feeAmount = _computeFeeTotal(_assets);

        uint256 assetsNoFee = _assets - feeAmount;

        // Check for rounding error since we round down in previewDeposit.
        /// @dev calling super.previewDeposit to ignore feeBPS
        require((_shares = super.previewDeposit(assetsNoFee)) != 0, "ZERO_SHARES");

        // Need to transfer before minting or ERC777s could reenter.
        asset.safeTransferFrom(msg.sender, address(this), assetsNoFee);

        _mint(_receiver, _shares);

        // Emit _assets transferred from sender including fees
        emit Deposit(msg.sender, _receiver, _assets, _shares);

        afterDeposit(assetsNoFee, _shares);

        _takeFee(feeAmount);
    }

    /// @notice The ```mint``` function allows a user to mint a given number of shares
    /// @param _shares The amount of shares to mint
    /// @param _receiver The address to send the shares to
    /// @return _assets The amount of underlying deposited
    function mint(uint256 _shares, address _receiver) public override returns (uint256 _assets) {
        syncRewardsAndDistribution();

        /// @dev calling super.previewMint to ignore feeBPS
        uint256 assetsNoFee = super.previewMint(_shares); // No need to check for rounding error, previewMint rounds up.

        // Need to transfer before minting or ERC777s could reenter.
        asset.safeTransferFrom(msg.sender, address(this), assetsNoFee);

        _mint(_receiver, _shares);

        uint256 feeAmount = _computeFeeRaw(assetsNoFee);

        /// @dev return _assets + feeAmount
        _assets = assetsNoFee + feeAmount;

        emit Deposit(msg.sender, _receiver, _assets, _shares);

        afterDeposit(assetsNoFee, _shares);

        _takeFee(feeAmount);
    }

    function previewMint(uint256 shares) public view override returns (uint256) {
        uint256 assets = super.previewMint(shares);
        return assets + _computeFeeRaw(assets);
    }

    function beforeWithdraw(uint256 amount, uint256 shares) internal virtual override {
        storedTotalAssets -= amount;
        totalBalance -= amount;
    }

    /// @notice The ```withdraw``` function allows a user to withdraw a given amount of underlying
    /// @param _assets The amount of underlying to withdraw
    /// @param _receiver The address to send the underlying to
    /// @param _owner The address of the owner of the shares
    /// @return _shares The amount of shares burned
    function withdraw(uint256 _assets, address _receiver, address _owner) public override returns (uint256 _shares) {
        syncRewardsAndDistribution();

        _shares = super.withdraw({ assets: _assets, receiver: _receiver, owner: _owner });
    }

    /// @notice The ```redeem``` function allows a user to redeem their shares for underlying
    /// @param _shares The amount of shares to redeem
    /// @param _receiver The address to send the underlying to
    /// @param _owner The address of the owner of the shares
    /// @return _assets The amount of underlying redeemed
    function redeem(uint256 _shares, address _receiver, address _owner) public override returns (uint256 _assets) {
        syncRewardsAndDistribution();

        _assets = super.redeem({ shares: _shares, receiver: _receiver, owner: _owner });
    }

    /// @notice The ```depositWithSignature``` function allows a user to use signed approvals to deposit
    /// @param _assets The amount of underlying to deposit
    /// @param _receiver The address to send the shares to
    /// @param _deadline The deadline for the signature
    /// @param _approveMax Whether or not to approve the maximum amount
    /// @param _v The v value of the signature
    /// @param _r The r value of the signature
    /// @param _s The s value of the signature
    /// @return _shares The amount of shares minted
    function depositWithSignature(
        uint256 _assets,
        address _receiver,
        uint256 _deadline,
        bool _approveMax,
        uint8 _v,
        bytes32 _r,
        bytes32 _s
    ) external returns (uint256 _shares) {
        uint256 _amount = _approveMax ? type(uint256).max : _assets;
        try 
            asset.permit({
                owner: msg.sender,
                spender: address(this),
                value: _amount,
                deadline: _deadline,
                v: _v,
                r: _r,
                s: _s
            }) 
        { } catch {
            /// @notice adding try...catch around to mitigate potential permit front-running
            /// see: https://www.trust-security.xyz/post/permission-denied
        }
        _shares = (deposit({ _assets: _assets, _receiver: _receiver }));
    }

    //==============================================================================
    // Events
    //==============================================================================

    /// @notice The ```SyncRewards``` event is emitted when the rewards cycle is synced
    /// @param cycleEnd The timestamp of the end of the current rewards cycle
    /// @param lastSync The timestamp of the last time the rewards cycle was synced
    /// @param rewardCycleAmount The amount of rewards to be distributed in the current cycle
    event SyncRewards(uint40 cycleEnd, uint40 lastSync, uint192 rewardCycleAmount);

    /// @notice The ```DistributeRewards``` event is emitted when rewards are distributed to storedTotalAssets
    /// @param rewardsToDistribute The amount of rewards that were distributed
    event DistributeRewards(uint256 rewardsToDistribute);
}

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

/// @notice Safe unsigned integer casting library that reverts on overflow.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/SafeCastLib.sol)
/// @author Modified from OpenZeppelin (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/math/SafeCast.sol)
library SafeCastLib {
    function safeCastTo248(uint256 x) internal pure returns (uint248 y) {
        require(x < 1 << 248);

        y = uint248(x);
    }

    function safeCastTo240(uint256 x) internal pure returns (uint240 y) {
        require(x < 1 << 240);

        y = uint240(x);
    }

    function safeCastTo232(uint256 x) internal pure returns (uint232 y) {
        require(x < 1 << 232);

        y = uint232(x);
    }

    function safeCastTo224(uint256 x) internal pure returns (uint224 y) {
        require(x < 1 << 224);

        y = uint224(x);
    }

    function safeCastTo216(uint256 x) internal pure returns (uint216 y) {
        require(x < 1 << 216);

        y = uint216(x);
    }

    function safeCastTo208(uint256 x) internal pure returns (uint208 y) {
        require(x < 1 << 208);

        y = uint208(x);
    }

    function safeCastTo200(uint256 x) internal pure returns (uint200 y) {
        require(x < 1 << 200);

        y = uint200(x);
    }

    function safeCastTo192(uint256 x) internal pure returns (uint192 y) {
        require(x < 1 << 192);

        y = uint192(x);
    }

    function safeCastTo184(uint256 x) internal pure returns (uint184 y) {
        require(x < 1 << 184);

        y = uint184(x);
    }

    function safeCastTo176(uint256 x) internal pure returns (uint176 y) {
        require(x < 1 << 176);

        y = uint176(x);
    }

    function safeCastTo168(uint256 x) internal pure returns (uint168 y) {
        require(x < 1 << 168);

        y = uint168(x);
    }

    function safeCastTo160(uint256 x) internal pure returns (uint160 y) {
        require(x < 1 << 160);

        y = uint160(x);
    }

    function safeCastTo152(uint256 x) internal pure returns (uint152 y) {
        require(x < 1 << 152);

        y = uint152(x);
    }

    function safeCastTo144(uint256 x) internal pure returns (uint144 y) {
        require(x < 1 << 144);

        y = uint144(x);
    }

    function safeCastTo136(uint256 x) internal pure returns (uint136 y) {
        require(x < 1 << 136);

        y = uint136(x);
    }

    function safeCastTo128(uint256 x) internal pure returns (uint128 y) {
        require(x < 1 << 128);

        y = uint128(x);
    }

    function safeCastTo120(uint256 x) internal pure returns (uint120 y) {
        require(x < 1 << 120);

        y = uint120(x);
    }

    function safeCastTo112(uint256 x) internal pure returns (uint112 y) {
        require(x < 1 << 112);

        y = uint112(x);
    }

    function safeCastTo104(uint256 x) internal pure returns (uint104 y) {
        require(x < 1 << 104);

        y = uint104(x);
    }

    function safeCastTo96(uint256 x) internal pure returns (uint96 y) {
        require(x < 1 << 96);

        y = uint96(x);
    }

    function safeCastTo88(uint256 x) internal pure returns (uint88 y) {
        require(x < 1 << 88);

        y = uint88(x);
    }

    function safeCastTo80(uint256 x) internal pure returns (uint80 y) {
        require(x < 1 << 80);

        y = uint80(x);
    }

    function safeCastTo72(uint256 x) internal pure returns (uint72 y) {
        require(x < 1 << 72);

        y = uint72(x);
    }

    function safeCastTo64(uint256 x) internal pure returns (uint64 y) {
        require(x < 1 << 64);

        y = uint64(x);
    }

    function safeCastTo56(uint256 x) internal pure returns (uint56 y) {
        require(x < 1 << 56);

        y = uint56(x);
    }

    function safeCastTo48(uint256 x) internal pure returns (uint48 y) {
        require(x < 1 << 48);

        y = uint48(x);
    }

    function safeCastTo40(uint256 x) internal pure returns (uint40 y) {
        require(x < 1 << 40);

        y = uint40(x);
    }

    function safeCastTo32(uint256 x) internal pure returns (uint32 y) {
        require(x < 1 << 32);

        y = uint32(x);
    }

    function safeCastTo24(uint256 x) internal pure returns (uint24 y) {
        require(x < 1 << 24);

        y = uint24(x);
    }

    function safeCastTo16(uint256 x) internal pure returns (uint16 y) {
        require(x < 1 << 16);

        y = uint16(x);
    }

    function safeCastTo8(uint256 x) internal pure returns (uint8 y) {
        require(x < 1 << 8);

        y = uint8(x);
    }
}

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

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

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

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

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

        require(success, "ETH_TRANSFER_FAILED");
    }

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

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

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

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

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

        require(success, "TRANSFER_FROM_FAILED");
    }

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

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

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

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

        require(success, "TRANSFER_FAILED");
    }

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

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

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

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

        require(success, "APPROVE_FAILED");
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.25;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import { SafeCastLib } from "@solmate/utils/SafeCastLib.sol";
import { SafeTransferLib } from "@solmate/utils/SafeTransferLib.sol";
import { LinearRewardsErc4626, ERC20 } from "./LinearRewardsErc4626.sol";
import { AuthNoOwner } from "./Dependencies/AuthNoOwner.sol";

/// @title Staked eBTC
/// @notice A ERC4626 Vault implementation with linear rewards, rewards can be capped
contract StakedEbtc is LinearRewardsErc4626, AuthNoOwner {
    using SafeTransferLib for ERC20;
    using SafeCastLib for *;

    /// @notice The maximum amount of rewards that can be distributed per second per 1e18 asset
    uint256 public maxDistributionPerSecondPerAsset;

    event Donation(address indexed donor, uint256 amount);

    /// @notice Receive an eBTC donation from an authorized donor
    function donate(uint256 amount) external requiresAuth {
        totalBalance += amount;
        asset.safeTransferFrom(msg.sender, address(this), amount);
        emit Donation(msg.sender, amount);
    }

    /// @notice Sweep unauthorized donations and extra tokens
    function sweep(address token) external requiresAuth {
        if (token == address(asset)) {
            uint256 currentBalance = asset.balanceOf(address(this));
            if (currentBalance > totalBalance) {
                unchecked {
                    asset.safeTransfer(msg.sender, currentBalance - totalBalance);
                }
            }
        } else {
            ERC20(token).safeTransfer(msg.sender, ERC20(token).balanceOf(address(this)));
        }
    }
    
    /// @param _underlying The erc20 asset deposited
    /// @param _name The name of the vault
    /// @param _symbol The symbol of the vault
    /// @param _rewardsCycleLength The length of the rewards cycle in seconds
    /// @param _maxDistributionPerSecondPerAsset The maximum amount of rewards that can be distributed per second per 1e18 asset
    constructor(
        IERC20 _underlying,
        string memory _name,
        string memory _symbol,
        uint32 _rewardsCycleLength,
        uint256 _maxDistributionPerSecondPerAsset,
        address _authorityAddress,
        address _feeRecipient
    ) LinearRewardsErc4626(ERC20(address(_underlying)), _name, _symbol, _rewardsCycleLength, _feeRecipient) {
        if (_maxDistributionPerSecondPerAsset > type(uint64).max) {
            _maxDistributionPerSecondPerAsset = type(uint64).max;
        }

        maxDistributionPerSecondPerAsset = _maxDistributionPerSecondPerAsset;
        _initializeAuthority(_authorityAddress);
    }

    /// @notice The ```SetMaxDistributionPerSecondPerAsset``` event is emitted when the maxDistributionPerSecondPerAsset is set
    /// @param oldMax The old maxDistributionPerSecondPerAsset value
    /// @param newMax The new maxDistributionPerSecondPerAsset value
    event SetMaxDistributionPerSecondPerAsset(uint256 oldMax, uint256 newMax);

    /// @notice The ```setMaxDistributionPerSecondPerAsset``` function sets the maxDistributionPerSecondPerAsset
    /// @dev This function can only be called by the timelock, caps the value to type(uint64).max
    /// @param _maxDistributionPerSecondPerAsset The maximum amount of rewards that can be distributed per second per 1e18 asset
    function setMaxDistributionPerSecondPerAsset(uint256 _maxDistributionPerSecondPerAsset) external requiresAuth {
        syncRewardsAndDistribution();

        // NOTE: prevents bricking the contract via overflow
        if (_maxDistributionPerSecondPerAsset > type(uint64).max) {
            _maxDistributionPerSecondPerAsset = type(uint64).max;
        }

        emit SetMaxDistributionPerSecondPerAsset({
            oldMax: maxDistributionPerSecondPerAsset,
            newMax: _maxDistributionPerSecondPerAsset
        });

        maxDistributionPerSecondPerAsset = _maxDistributionPerSecondPerAsset;
    }

    /// @notice Sets the ```mintingFee``` required deposit and mint
    /// @param _mintingFee the amount of minting fee in FEE_PRECISION
    function setMintingFee(uint256 _mintingFee) external requiresAuth {
        _setMintingFee(_mintingFee);
    }

    /// @notice The ```calculateRewardsToDistribute``` function calculates the amount of rewards to distribute based on the rewards cycle data and the time passed
    /// @param _rewardsCycleData The rewards cycle data
    /// @param _deltaTime The time passed since the last rewards distribution
    /// @return _rewardToDistribute The amount of rewards to distribute
    function calculateRewardsToDistribute(
        RewardsCycleData memory _rewardsCycleData,
        uint256 _deltaTime
    ) public view override returns (uint256 _rewardToDistribute) {
        _rewardToDistribute = super.calculateRewardsToDistribute({
            _rewardsCycleData: _rewardsCycleData,
            _deltaTime: _deltaTime
        });

        // Cap rewards
        uint256 _maxDistribution = (maxDistributionPerSecondPerAsset * _deltaTime * storedTotalAssets) / PRECISION;
        if (_rewardToDistribute > _maxDistribution) {
            _rewardToDistribute = _maxDistribution;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/draft-IERC6093.sol)
pragma solidity ^0.8.20;

/**
 * @dev Standard ERC20 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC20 tokens.
 */
interface IERC20Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientBalance(address sender, uint256 balance, uint256 needed);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC20InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC20InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `spender`’s `allowance`. Used in transfers.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     * @param allowance Amount of tokens a `spender` is allowed to operate with.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientAllowance(address spender, uint256 allowance, uint256 needed);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC20InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `spender` to be approved. Used in approvals.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC20InvalidSpender(address spender);
}

/**
 * @dev Standard ERC721 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC721 tokens.
 */
interface IERC721Errors {
    /**
     * @dev Indicates that an address can't be an owner. For example, `address(0)` is a forbidden owner in EIP-20.
     * Used in balance queries.
     * @param owner Address of the current owner of a token.
     */
    error ERC721InvalidOwner(address owner);

    /**
     * @dev Indicates a `tokenId` whose `owner` is the zero address.
     * @param tokenId Identifier number of a token.
     */
    error ERC721NonexistentToken(uint256 tokenId);

    /**
     * @dev Indicates an error related to the ownership over a particular token. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param tokenId Identifier number of a token.
     * @param owner Address of the current owner of a token.
     */
    error ERC721IncorrectOwner(address sender, uint256 tokenId, address owner);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC721InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC721InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param tokenId Identifier number of a token.
     */
    error ERC721InsufficientApproval(address operator, uint256 tokenId);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC721InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC721InvalidOperator(address operator);
}

/**
 * @dev Standard ERC1155 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC1155 tokens.
 */
interface IERC1155Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     * @param tokenId Identifier number of a token.
     */
    error ERC1155InsufficientBalance(address sender, uint256 balance, uint256 needed, uint256 tokenId);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC1155InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC1155InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param owner Address of the current owner of a token.
     */
    error ERC1155MissingApprovalForAll(address operator, address owner);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC1155InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC1155InvalidOperator(address operator);

    /**
     * @dev Indicates an array length mismatch between ids and values in a safeBatchTransferFrom operation.
     * Used in batch transfers.
     * @param idsLength Length of the array of token identifiers
     * @param valuesLength Length of the array of token amounts
     */
    error ERC1155InvalidArrayLength(uint256 idsLength, uint256 valuesLength);
}

{
  "compilationTarget": {
    "src/StakedEbtc.sol": "StakedEbtc"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [
    ":@chimera/=lib/chimera/src/",
    ":@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    ":@solmate/=lib/solmate/src/",
    ":chimera/=lib/chimera/src/",
    ":ds-test/=lib/solmate/lib/ds-test/src/",
    ":erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    ":forge-std/=lib/forge-std/src/",
    ":openzeppelin-contracts/=lib/openzeppelin-contracts/",
    ":solmate/=lib/solmate/src/"
  ]
}