// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;

// Learning-only contracts built on OpenZeppelin Contracts (Upgradeable) v5.7.0. Not audited.
import {Initializable} from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import {UUPSUpgradeable} from "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";
import {ERC1967Proxy} from "@openzeppelin/contracts/proxy/ERC1967/ERC1967Proxy.sol";

// Forgets to lock its own initializer.
contract BoxOpen is Initializable, OwnableUpgradeable, UUPSUpgradeable {
    function initialize(address owner_) external initializer {
        __Ownable_init(owner_);
    }

    function _authorizeUpgrade(address) internal override onlyOwner {}
}

// The form recommended by OpenZeppelin: lock the implementation in its constructor.
contract BoxLocked is Initializable, OwnableUpgradeable, UUPSUpgradeable {
    /// @custom:oz-upgrades-unsafe-allow constructor
    constructor() {
        _disableInitializers();
    }

    function initialize(address owner_) external initializer {
        __Ownable_init(owner_);
    }

    function _authorizeUpgrade(address) internal override onlyOwner {}
}