/**
 * StackGalleryRegistry - Main registry class
 * Integrates smartregistry with Stack.Gallery's auth, storage, and database
 */

import * as plugins from './plugins.ts';
import { initDb, closeDb, isDbConnected } from './models/db.ts';
import { StackGalleryAuthProvider } from './providers/auth.provider.ts';
import { StackGalleryStorageHooks } from './providers/storage.provider.ts';
import { ApiRouter } from './api/router.ts';

export interface IRegistryConfig {
  // MongoDB configuration
  mongoUrl: string;
  mongoDb: string;

  // S3 configuration
  s3Endpoint: string;
  s3AccessKey: string;
  s3SecretKey: string;
  s3Bucket: string;
  s3Region?: string;

  // Server configuration
  host?: string;
  port?: number;

  // Registry settings
  storagePath?: string;
  enableUpstreamCache?: boolean;
  upstreamCacheExpiry?: number; // hours

  // JWT configuration
  jwtSecret?: string;
}

export class StackGalleryRegistry {
  private config: IRegistryConfig;
  private smartBucket: plugins.smartbucket.SmartBucket | null = null;
  private smartRegistry: plugins.smartregistry.SmartRegistry | null = null;
  private authProvider: StackGalleryAuthProvider | null = null;
  private storageHooks: StackGalleryStorageHooks | null = null;
  private apiRouter: ApiRouter | null = null;
  private isInitialized = false;

  constructor(config: IRegistryConfig) {
    this.config = {
      host: '0.0.0.0',
      port: 3000,
      storagePath: 'packages',
      enableUpstreamCache: true,
      upstreamCacheExpiry: 24,
      ...config,
    };
  }

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

    console.log('[StackGalleryRegistry] Initializing...');

    // Initialize MongoDB
    console.log('[StackGalleryRegistry] Connecting to MongoDB...');
    await initDb(this.config.mongoUrl, this.config.mongoDb);
    console.log('[StackGalleryRegistry] MongoDB connected');

    // Initialize S3/SmartBucket
    console.log('[StackGalleryRegistry] Initializing S3 storage...');
    this.smartBucket = new plugins.smartbucket.SmartBucket({
      accessKey: this.config.s3AccessKey,
      accessSecret: this.config.s3SecretKey,
      endpoint: this.config.s3Endpoint,
      bucketName: this.config.s3Bucket,
    });
    console.log('[StackGalleryRegistry] S3 storage initialized');

    // Initialize auth provider
    this.authProvider = new StackGalleryAuthProvider();

    // Initialize storage hooks
    this.storageHooks = new StackGalleryStorageHooks({
      bucket: this.smartBucket,
      basePath: this.config.storagePath!,
    });

    // Initialize smartregistry
    console.log('[StackGalleryRegistry] Initializing smartregistry...');
    this.smartRegistry = new plugins.smartregistry.SmartRegistry({
      authProvider: this.authProvider,
      storageHooks: this.storageHooks,
      storage: {
        type: 's3',
        bucket: this.smartBucket,
        basePath: this.config.storagePath,
      },
      upstreamCache: this.config.enableUpstreamCache
        ? {
            enabled: true,
            expiryHours: this.config.upstreamCacheExpiry,
          }
        : undefined,
    });
    console.log('[StackGalleryRegistry] smartregistry initialized');

    // Initialize API router
    console.log('[StackGalleryRegistry] Initializing API router...');
    this.apiRouter = new ApiRouter();
    console.log('[StackGalleryRegistry] API router initialized');

    this.isInitialized = true;
    console.log('[StackGalleryRegistry] Initialization complete');
  }

  /**
   * Start the HTTP server
   */
  public async start(): Promise<void> {
    if (!this.isInitialized) {
      await this.init();
    }

    const port = this.config.port!;
    const host = this.config.host!;

    console.log(`[StackGalleryRegistry] Starting server on ${host}:${port}...`);

    Deno.serve(
      { port, hostname: host },
      async (request: Request): Promise<Response> => {
        return await this.handleRequest(request);
      }
    );

    console.log(`[StackGalleryRegistry] Server running on http://${host}:${port}`);
  }

  /**
   * Handle incoming HTTP request
   */
  private async handleRequest(request: Request): Promise<Response> {
    const url = new URL(request.url);
    const path = url.pathname;

    // Health check
    if (path === '/health' || path === '/healthz') {
      return this.healthCheck();
    }

    // API endpoints (handled by REST API layer)
    if (path.startsWith('/api/')) {
      return await this.handleApiRequest(request);
    }

    // Registry protocol endpoints
    // NPM: /-/..., /@scope/package, /package
    // OCI: /v2/...
    // Maven: /maven2/...
    // PyPI: /simple/..., /pypi/...
    // Cargo: /api/v1/crates/...
    // Composer: /packages.json, /p/...
    // RubyGems: /api/v1/gems/..., /gems/...

    if (this.smartRegistry) {
      try {
        return await this.smartRegistry.handleRequest(request);
      } catch (error) {
        console.error('[StackGalleryRegistry] Request error:', error);
        return new Response(
          JSON.stringify({ error: 'Internal server error' }),
          {
            status: 500,
            headers: { 'Content-Type': 'application/json' },
          }
        );
      }
    }

    return new Response('Not Found', { status: 404 });
  }

  /**
   * Handle API requests
   */
  private async handleApiRequest(request: Request): Promise<Response> {
    if (!this.apiRouter) {
      return new Response(
        JSON.stringify({ error: 'API router not initialized' }),
        {
          status: 503,
          headers: { 'Content-Type': 'application/json' },
        }
      );
    }

    return await this.apiRouter.handle(request);
  }

  /**
   * Health check endpoint
   */
  private healthCheck(): Response {
    const healthy = this.isInitialized && isDbConnected();

    const status = {
      status: healthy ? 'healthy' : 'unhealthy',
      timestamp: new Date().toISOString(),
      services: {
        mongodb: isDbConnected() ? 'connected' : 'disconnected',
        s3: this.smartBucket ? 'initialized' : 'not initialized',
        registry: this.smartRegistry ? 'initialized' : 'not initialized',
      },
    };

    return new Response(JSON.stringify(status), {
      status: healthy ? 200 : 503,
      headers: { 'Content-Type': 'application/json' },
    });
  }

  /**
   * Stop the registry
   */
  public async stop(): Promise<void> {
    console.log('[StackGalleryRegistry] Shutting down...');
    await closeDb();
    this.isInitialized = false;
    console.log('[StackGalleryRegistry] Shutdown complete');
  }

  /**
   * Get the smartregistry instance
   */
  public getSmartRegistry(): plugins.smartregistry.SmartRegistry | null {
    return this.smartRegistry;
  }

  /**
   * Get the smartbucket instance
   */
  public getSmartBucket(): plugins.smartbucket.SmartBucket | null {
    return this.smartBucket;
  }

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

/**
 * Create registry from environment variables
 */
export function createRegistryFromEnv(): StackGalleryRegistry {
  const config: IRegistryConfig = {
    mongoUrl: Deno.env.get('MONGODB_URL') || 'mongodb://localhost:27017',
    mongoDb: Deno.env.get('MONGODB_DB') || 'stackgallery',
    s3Endpoint: Deno.env.get('S3_ENDPOINT') || 'http://localhost:9000',
    s3AccessKey: Deno.env.get('S3_ACCESS_KEY') || 'minioadmin',
    s3SecretKey: Deno.env.get('S3_SECRET_KEY') || 'minioadmin',
    s3Bucket: Deno.env.get('S3_BUCKET') || 'registry',
    s3Region: Deno.env.get('S3_REGION'),
    host: Deno.env.get('HOST') || '0.0.0.0',
    port: parseInt(Deno.env.get('PORT') || '3000', 10),
    storagePath: Deno.env.get('STORAGE_PATH') || 'packages',
    enableUpstreamCache: Deno.env.get('ENABLE_UPSTREAM_CACHE') !== 'false',
    upstreamCacheExpiry: parseInt(Deno.env.get('UPSTREAM_CACHE_EXPIRY') || '24', 10),
    jwtSecret: Deno.env.get('JWT_SECRET'),
  };

  return new StackGalleryRegistry(config);
}