// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";

/**
 * @title PluginRegistry
 * @notice Central registry for all pluggable components
 * @dev Enables adding new asset types, liquidity providers, compliance modules without redeployment
 */
contract PluginRegistry is 
    Initializable,
    AccessControlUpgradeable,
    UUPSUpgradeable
{
    bytes32 public constant PLUGIN_ADMIN_ROLE = keccak256("PLUGIN_ADMIN_ROLE");
    bytes32 public constant UPGRADER_ROLE = keccak256("UPGRADER_ROLE");

    enum PluginType {
        AssetTypeHandler,
        LiquidityProvider,
        ComplianceModule,
        OracleProvider,
        VaultStrategy
    }

    struct Plugin {
        address implementation;
        string version;
        bool active;
        uint256 registeredAt;
        string description;
    }

    // Storage
    mapping(PluginType => mapping(bytes32 => Plugin)) public plugins;
    mapping(PluginType => bytes32[]) public pluginsByType;
    
    // Plugin metadata
    mapping(address => bool) public isRegisteredPlugin;
    mapping(PluginType => uint256) public pluginCount;

    event PluginRegistered(
        PluginType indexed pluginType,
        bytes32 indexed identifier,
        address implementation,
        string version
    );
    
    event PluginActivated(PluginType indexed pluginType, bytes32 indexed identifier);
    event PluginDeactivated(PluginType indexed pluginType, bytes32 indexed identifier);
    event PluginUpgraded(
        PluginType indexed pluginType,
        bytes32 indexed identifier,
        address oldImplementation,
        address newImplementation
    );

    /// @custom:oz-upgrades-unsafe-allow constructor
    constructor() {
        _disableInitializers();
    }

    function initialize(address admin) external initializer {
        __AccessControl_init();
        __UUPSUpgradeable_init();
        
        _grantRole(DEFAULT_ADMIN_ROLE, admin);
        _grantRole(PLUGIN_ADMIN_ROLE, admin);
        _grantRole(UPGRADER_ROLE, admin);
    }

    function _authorizeUpgrade(address newImplementation)
        internal override onlyRole(UPGRADER_ROLE) {}

    /**
     * @notice Register new plugin
     */
    function registerPlugin(
        PluginType pluginType,
        bytes32 identifier,
        address implementation,
        string calldata version,
        string calldata description
    ) external onlyRole(PLUGIN_ADMIN_ROLE) {
        require(implementation != address(0), "Zero address");
        require(implementation.code.length > 0, "Not a contract");
        require(plugins[pluginType][identifier].implementation == address(0), "Already registered");
        
        plugins[pluginType][identifier] = Plugin({
            implementation: implementation,
            version: version,
            active: true,
            registeredAt: block.timestamp,
            description: description
        });
        
        pluginsByType[pluginType].push(identifier);
        isRegisteredPlugin[implementation] = true;
        pluginCount[pluginType]++;
        
        emit PluginRegistered(pluginType, identifier, implementation, version);
    }

    /**
     * @notice Upgrade plugin to new implementation
     */
    function upgradePlugin(
        PluginType pluginType,
        bytes32 identifier,
        address newImplementation,
        string calldata newVersion
    ) external onlyRole(PLUGIN_ADMIN_ROLE) {
        require(newImplementation != address(0), "Zero address");
        require(newImplementation.code.length > 0, "Not a contract");
        
        Plugin storage plugin = plugins[pluginType][identifier];
        require(plugin.implementation != address(0), "Plugin not found");
        
        address oldImplementation = plugin.implementation;
        plugin.implementation = newImplementation;
        plugin.version = newVersion;
        isRegisteredPlugin[newImplementation] = true;
        
        emit PluginUpgraded(pluginType, identifier, oldImplementation, newImplementation);
    }

    /**
     * @notice Activate plugin
     */
    function activatePlugin(
        PluginType pluginType,
        bytes32 identifier
    ) external onlyRole(PLUGIN_ADMIN_ROLE) {
        Plugin storage plugin = plugins[pluginType][identifier];
        require(plugin.implementation != address(0), "Plugin not found");
        
        plugin.active = true;
        
        emit PluginActivated(pluginType, identifier);
    }

    /**
     * @notice Deactivate plugin
     */
    function deactivatePlugin(
        PluginType pluginType,
        bytes32 identifier
    ) external onlyRole(PLUGIN_ADMIN_ROLE) {
        Plugin storage plugin = plugins[pluginType][identifier];
        require(plugin.implementation != address(0), "Plugin not found");
        
        plugin.active = false;
        
        emit PluginDeactivated(pluginType, identifier);
    }

    // View functions
    
    function getPlugin(
        PluginType pluginType,
        bytes32 identifier
    ) external view returns (address implementation) {
        Plugin memory plugin = plugins[pluginType][identifier];
        require(plugin.active, "Plugin not active");
        return plugin.implementation;
    }

    function getPluginInfo(
        PluginType pluginType,
        bytes32 identifier
    ) external view returns (Plugin memory) {
        return plugins[pluginType][identifier];
    }

    function getAllPlugins(PluginType pluginType) external view returns (bytes32[] memory) {
        return pluginsByType[pluginType];
    }

    function getPluginCount(PluginType pluginType) external view returns (uint256) {
        return pluginCount[pluginType];
    }

    function isPluginActive(
        PluginType pluginType,
        bytes32 identifier
    ) external view returns (bool) {
        return plugins[pluginType][identifier].active;
    }
}