import { RegistryStorage } from './core/classes.registrystorage.js';
import { AuthManager } from './core/classes.authmanager.js';
import { BaseRegistry } from './core/classes.baseregistry.js';
import type {
  IProtocolConfig,
  IRegistryConfig,
  IRequestContext,
  IResponse,
  TRegistryProtocol,
} from './core/interfaces.core.js';
import { toReadableStream } from './core/helpers.stream.js';
import { OciRegistry } from './oci/classes.ociregistry.js';
import { NpmRegistry } from './npm/classes.npmregistry.js';
import { MavenRegistry } from './maven/classes.mavenregistry.js';
import { CargoRegistry } from './cargo/classes.cargoregistry.js';
import { ComposerRegistry } from './composer/classes.composerregistry.js';
import { PypiRegistry } from './pypi/classes.pypiregistry.js';
import { RubyGemsRegistry } from './rubygems/classes.rubygemsregistry.js';

type TRegistryDescriptor = {
  protocol: TRegistryProtocol;
  getConfig: (config: IRegistryConfig) => IProtocolConfig | undefined;
  matchesPath: (config: IRegistryConfig, path: string) => boolean;
  create: (args: {
    storage: RegistryStorage;
    authManager: AuthManager;
    config: IRegistryConfig;
    protocolConfig: IProtocolConfig;
  }) => BaseRegistry;
};

const registryDescriptors: TRegistryDescriptor[] = [
  {
    protocol: 'oci',
    getConfig: (config) => config.oci,
    matchesPath: (config, path) => path.startsWith(config.oci?.basePath ?? '/oci'),
    create: ({ storage, authManager, config, protocolConfig }) => {
      const ociTokens = config.auth.ociTokens?.enabled ? {
        realm: config.auth.ociTokens.realm,
        service: config.auth.ociTokens.service,
      } : undefined;
      return new OciRegistry(
        storage,
        authManager,
        protocolConfig.basePath ?? '/oci',
        ociTokens,
        config.upstreamProvider
      );
    },
  },
  {
    protocol: 'npm',
    getConfig: (config) => config.npm,
    matchesPath: (config, path) => path.startsWith(config.npm?.basePath ?? '/npm'),
    create: ({ storage, authManager, config, protocolConfig }) => {
      const basePath = protocolConfig.basePath ?? '/npm';
      return new NpmRegistry(
        storage,
        authManager,
        basePath,
        protocolConfig.registryUrl ?? `http://localhost:5000${basePath}`,
        config.upstreamProvider
      );
    },
  },
  {
    protocol: 'maven',
    getConfig: (config) => config.maven,
    matchesPath: (config, path) => path.startsWith(config.maven?.basePath ?? '/maven'),
    create: ({ storage, authManager, config, protocolConfig }) => {
      const basePath = protocolConfig.basePath ?? '/maven';
      return new MavenRegistry(
        storage,
        authManager,
        basePath,
        protocolConfig.registryUrl ?? `http://localhost:5000${basePath}`,
        config.upstreamProvider
      );
    },
  },
  {
    protocol: 'cargo',
    getConfig: (config) => config.cargo,
    matchesPath: (config, path) => path.startsWith(config.cargo?.basePath ?? '/cargo'),
    create: ({ storage, authManager, config, protocolConfig }) => {
      const basePath = protocolConfig.basePath ?? '/cargo';
      return new CargoRegistry(
        storage,
        authManager,
        basePath,
        protocolConfig.registryUrl ?? `http://localhost:5000${basePath}`,
        config.upstreamProvider
      );
    },
  },
  {
    protocol: 'composer',
    getConfig: (config) => config.composer,
    matchesPath: (config, path) => path.startsWith(config.composer?.basePath ?? '/composer'),
    create: ({ storage, authManager, config, protocolConfig }) => {
      const basePath = protocolConfig.basePath ?? '/composer';
      return new ComposerRegistry(
        storage,
        authManager,
        basePath,
        protocolConfig.registryUrl ?? `http://localhost:5000${basePath}`,
        config.upstreamProvider
      );
    },
  },
  {
    protocol: 'pypi',
    getConfig: (config) => config.pypi,
    matchesPath: (config, path) => {
      const basePath = config.pypi?.basePath ?? '/pypi';
      return path.startsWith(basePath) || path.startsWith('/simple');
    },
    create: ({ storage, authManager, config, protocolConfig }) => new PypiRegistry(
      storage,
      authManager,
      protocolConfig.basePath ?? '/pypi',
      protocolConfig.registryUrl ?? 'http://localhost:5000',
      config.upstreamProvider
    ),
  },
  {
    protocol: 'rubygems',
    getConfig: (config) => config.rubygems,
    matchesPath: (config, path) => path.startsWith(config.rubygems?.basePath ?? '/rubygems'),
    create: ({ storage, authManager, config, protocolConfig }) => {
      const basePath = protocolConfig.basePath ?? '/rubygems';
      return new RubyGemsRegistry(
        storage,
        authManager,
        basePath,
        protocolConfig.registryUrl ?? `http://localhost:5000${basePath}`,
        config.upstreamProvider
      );
    },
  },
];

/**
 * Main registry orchestrator.
 * Routes requests to appropriate protocol handlers (OCI, NPM, Maven, Cargo, Composer, PyPI, or RubyGems).
 *
 * Supports pluggable authentication and storage hooks:
 *
 * @example
 * ```typescript
 * // Basic usage with default in-memory auth
 * const registry = new SmartRegistry(config);
 *
 * // With custom auth provider (LDAP, OAuth, etc.)
 * const registry = new SmartRegistry({
 *   ...config,
 *   authProvider: new LdapAuthProvider(ldapClient),
 * });
 *
 * // With storage hooks for quota tracking
 * const registry = new SmartRegistry({
 *   ...config,
 *   storageHooks: {
 *     beforePut: async (ctx) => {
 *       const quota = await getQuota(ctx.actor?.orgId);
 *       if (ctx.metadata?.size > quota) {
 *         return { allowed: false, reason: 'Quota exceeded' };
 *       }
 *       return { allowed: true };
 *     },
 *     afterPut: async (ctx) => {
 *       await auditLog('storage.put', ctx);
 *     }
 *   }
 * });
 * ```
 */
export class SmartRegistry {
  private storage: RegistryStorage;
  private authManager: AuthManager;
  private registries: Map<TRegistryProtocol, BaseRegistry> = new Map();
  private config: IRegistryConfig;
  private initialized: boolean = false;

  constructor(config: IRegistryConfig) {
    this.config = config;

    // Create storage with optional hooks
    this.storage = new RegistryStorage(config.storage, config.storageHooks);

    // Create auth manager with optional custom provider
    this.authManager = new AuthManager(config.auth, config.authProvider);
  }

  /**
   * Initialize the registry system
   */
  public async init(): Promise<void> {
    if (this.initialized) return;

    // Initialize storage
    await this.storage.init();

    // Initialize auth manager
    await this.authManager.init();

    for (const descriptor of registryDescriptors) {
      const protocolConfig = descriptor.getConfig(this.config);
      if (!protocolConfig?.enabled) {
        continue;
      }

      const registry = descriptor.create({
        storage: this.storage,
        authManager: this.authManager,
        config: this.config,
        protocolConfig,
      });
      await registry.init();
      this.registries.set(descriptor.protocol, registry);
    }

    this.initialized = true;
  }

  /**
   * Handle an incoming HTTP request
   * Routes to the appropriate protocol handler based on path
   */
  public async handleRequest(context: IRequestContext): Promise<IResponse> {
    const path = context.path;
    let response: IResponse | undefined;

    for (const descriptor of registryDescriptors) {
      if (response) {
        break;
      }

      const protocolConfig = descriptor.getConfig(this.config);
      if (!protocolConfig?.enabled || !descriptor.matchesPath(this.config, path)) {
        continue;
      }

      const registry = this.registries.get(descriptor.protocol);
      if (registry) {
        response = await registry.handleRequest(context);
      }
    }

    // No matching registry
    if (!response) {
      response = {
        status: 404,
        headers: { 'Content-Type': 'application/json' },
        body: {
          error: 'NOT_FOUND',
          message: 'No registry handler for this path',
        },
      };
    }

    // Normalize body to ReadableStream<Uint8Array> at the API boundary
    if (response.body != null && !(response.body instanceof ReadableStream)) {
      if (!Buffer.isBuffer(response.body) && typeof response.body === 'object' && !(response.body instanceof Uint8Array)) {
        response.headers['Content-Type'] ??= 'application/json';
      }
      response.body = toReadableStream(response.body);
    }

    return response;
  }

  /**
   * Get the storage instance (for testing/advanced use)
   */
  public getStorage(): RegistryStorage {
    return this.storage;
  }

  /**
   * Get the auth manager instance (for testing/advanced use)
   */
  public getAuthManager(): AuthManager {
    return this.authManager;
  }

  /**
   * Get a specific registry handler
   */
  public getRegistry(protocol: 'oci' | 'npm' | 'maven' | 'cargo' | 'composer' | 'pypi' | 'rubygems'): BaseRegistry | undefined {
    return this.registries.get(protocol);
  }

  /**
   * Check if the registry is initialized
   */
  public isInitialized(): boolean {
    return this.initialized;
  }

  /**
   * Clean up resources (timers, connections, etc.)
   */
  public destroy(): void {
    for (const registry of this.registries.values()) {
      registry.destroy();
    }
  }
}