/**
 * Onebox Registry Manager
 *
 * Manages the local Docker registry using:
 * - @push.rocks/smarts3 (S3-compatible server with filesystem storage)
 * - @push.rocks/smartregistry (OCI-compliant Docker registry)
 */

import * as plugins from '../plugins.ts';
import { logger } from '../logging.ts';

export class RegistryManager {
  private s3Server: any = null;
  private registry: any = null;
  private jwtSecret: string;
  private baseUrl: string;
  private isInitialized = false;

  constructor(private options: {
    dataDir?: string;
    port?: number;
    baseUrl?: string;
  } = {}) {
    this.jwtSecret = this.getJwtSecret();
    this.baseUrl = options.baseUrl || 'localhost:5000';
  }

  /**
   * Initialize the registry (start smarts3 and smartregistry)
   */
  async init(): Promise<void> {
    if (this.isInitialized) {
      logger.warn('Registry already initialized');
      return;
    }

    try {
      const dataDir = this.options.dataDir || './.nogit/registry-data';
      const port = this.options.port || 4000;

      logger.info(`Starting smarts3 server on port ${port}...`);

      // 1. Start smarts3 server (S3-compatible storage with filesystem backend)
      this.s3Server = await plugins.smarts3.Smarts3.createAndStart({
        server: {
          port: port,
          host: '0.0.0.0',
        },
        storage: {
          bucketsDir: dataDir,
          cleanSlate: false, // Preserve data across restarts
        },
      });

      logger.success(`smarts3 server started on port ${port}`);

      // 2. Configure smartregistry to use smarts3
      logger.info('Initializing smartregistry...');

      this.registry = new plugins.smartregistry.SmartRegistry({
        storage: {
          endpoint: 'localhost',
          port: port,
          accessKey: 'onebox', // smarts3 doesn't validate credentials
          accessSecret: 'onebox',
          useSsl: false,
          region: 'us-east-1',
          bucketName: 'onebox-registry',
        },
        auth: {
          jwtSecret: this.jwtSecret,
          ociTokens: {
            enabled: true,
            issuer: 'onebox-registry',
            service: 'onebox-registry',
          },
        },
        oci: {
          enabled: true,
          basePath: '/v2',
        },
      });

      await this.registry.init();

      this.isInitialized = true;
      logger.success('Onebox Registry initialized successfully');
    } catch (error) {
      logger.error(`Failed to initialize registry: ${error.message}`);
      throw error;
    }
  }

  /**
   * Handle incoming HTTP requests to the registry
   */
  async handleRequest(req: Request): Promise<Response> {
    if (!this.isInitialized) {
      return new Response('Registry not initialized', { status: 503 });
    }

    try {
      return await this.registry.handleRequest(req);
    } catch (error) {
      logger.error(`Registry request error: ${error.message}`);
      return new Response('Internal registry error', { status: 500 });
    }
  }

  /**
   * Get all tags for a repository
   */
  async getImageTags(repository: string): Promise<string[]> {
    if (!this.isInitialized) {
      throw new Error('Registry not initialized');
    }

    try {
      const tags = await this.registry.getTags(repository);
      return tags || [];
    } catch (error) {
      logger.warn(`Failed to get tags for ${repository}: ${error.message}`);
      return [];
    }
  }

  /**
   * Get the manifest digest for a specific image tag
   */
  async getImageDigest(repository: string, tag: string): Promise<string | null> {
    if (!this.isInitialized) {
      throw new Error('Registry not initialized');
    }

    try {
      // Check if getManifest method exists (API may have changed)
      if (typeof this.registry.getManifest !== 'function') {
        // Method not available in current API version
        return null;
      }

      const manifest = await this.registry.getManifest(repository, tag);
      if (manifest && manifest.digest) {
        return manifest.digest;
      }
      return null;
    } catch (error) {
      // Only log if it's not a "not a function" error
      if (!error.message.includes('not a function')) {
        logger.warn(`Failed to get digest for ${repository}:${tag}: ${error.message}`);
      }
      return null;
    }
  }

  /**
   * Delete an image by tag
   */
  async deleteImage(repository: string, tag: string): Promise<void> {
    if (!this.isInitialized) {
      throw new Error('Registry not initialized');
    }

    try {
      await this.registry.deleteManifest(repository, tag);
      logger.info(`Deleted image ${repository}:${tag}`);
    } catch (error) {
      logger.error(`Failed to delete image ${repository}:${tag}: ${error.message}`);
      throw error;
    }
  }

  /**
   * Get or generate the JWT secret for token signing
   */
  private getJwtSecret(): string {
    // In production, this should be stored securely
    // For now, use a consistent secret stored in environment or generate one
    const secret = Deno.env.get('REGISTRY_JWT_SECRET');
    if (secret) {
      return secret;
    }

    // Generate a random secret (this will be different on each restart)
    // In production, you'd want to persist this
    const randomSecret = crypto.randomUUID() + crypto.randomUUID();
    logger.warn('Using generated JWT secret (will be different on restart)');
    logger.warn('Set REGISTRY_JWT_SECRET environment variable for persistence');
    return randomSecret;
  }

  /**
   * Get the registry base URL
   */
  getBaseUrl(): string {
    return this.baseUrl;
  }

  /**
   * Get the full image name for a service
   */
  getImageName(serviceName: string, tag: string = 'latest'): string {
    return `${this.baseUrl}/${serviceName}:${tag}`;
  }

  /**
   * Stop the registry and smarts3 server
   */
  async stop(): Promise<void> {
    if (this.s3Server) {
      try {
        await this.s3Server.stop();
        logger.info('smarts3 server stopped');
      } catch (error) {
        logger.error(`Error stopping smarts3: ${error.message}`);
      }
    }

    this.isInitialized = false;
    logger.info('Registry stopped');
  }
}