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

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

// Bundled UI files (generated by tsbundle with base64ts output mode)
let bundledFileMap: Map<string, { data: Uint8Array; contentType: string }> | null = null;
try {
  // @ts-ignore - generated file may not exist yet
  const { files } = await import('../ts_bundled/bundle.ts');
  bundledFileMap = new Map();
  for (const file of files as Array<{ path: string; contentBase64: string }>) {
    const binary = Uint8Array.from(atob(file.contentBase64), (c) => c.charCodeAt(0));
    const ext = file.path.split('.').pop() || '';
    bundledFileMap.set(`/${file.path}`, { data: binary, contentType: getContentType(ext) });
  }
} catch {
  console.warn('[StackGalleryRegistry] No bundled UI found (ts_bundled/bundle.ts missing)');
}

function getContentType(ext: string): string {
  const types: Record<string, string> = {
    html: 'text/html',
    js: 'application/javascript',
    css: 'text/css',
    json: 'application/json',
    png: 'image/png',
    jpg: 'image/jpeg',
    jpeg: 'image/jpeg',
    gif: 'image/gif',
    svg: 'image/svg+xml',
    ico: 'image/x-icon',
    woff: 'font/woff',
    woff2: 'font/woff2',
    ttf: 'font/ttf',
    eot: 'application/vnd.ms-fontobject',
    map: 'application/json',
  };
  return types[ext] || 'application/octet-stream';
}

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 opsServer: OpsServer | 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,
      bucketName: this.config.s3Bucket,
      basePath: this.config.storagePath!,
    });

    // Initialize smartregistry
    console.log('[StackGalleryRegistry] Initializing smartregistry...');
    this.smartRegistry = new plugins.smartregistry.SmartRegistry({
      authProvider: this.authProvider,
      storageHooks: this.storageHooks,
      storage: {
        endpoint: this.config.s3Endpoint,
        accessKey: this.config.s3AccessKey,
        accessSecret: this.config.s3SecretKey,
        bucketName: this.config.s3Bucket,
        region: this.config.s3Region,
      },
      auth: {
        jwtSecret: this.config.jwtSecret || 'change-me-in-production',
        tokenStore: 'database',
        npmTokens: { enabled: true },
        ociTokens: {
          enabled: true,
          realm: 'stack.gallery',
          service: 'registry',
        },
      },
    });
    console.log('[StackGalleryRegistry] smartregistry initialized');

    // Initialize OpsServer (TypedRequest handlers)
    console.log('[StackGalleryRegistry] Initializing OpsServer...');
    this.opsServer = new OpsServer(this);
    await this.opsServer.start();
    console.log('[StackGalleryRegistry] OpsServer 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();
    }

    // TypedRequest endpoint (handled by OpsServer TypedRouter)
    if (path === '/typedrequest' && request.method === 'POST') {
      return await this.handleTypedRequest(request);
    }

    // Legacy REST API endpoints (keep for backwards compatibility during migration)
    // TODO: Remove once frontend is fully migrated to TypedRequest

    // Registry protocol endpoints (handled by smartregistry)
    const registryPaths = [
      '/-/',
      '/v2/',
      '/maven2/',
      '/simple/',
      '/pypi/',
      '/api/v1/crates/',
      '/packages.json',
      '/p/',
      '/api/v1/gems/',
      '/gems/',
    ];
    const isRegistryPath = registryPaths.some((p) => path.startsWith(p)) ||
      (path.startsWith('/@') && !path.startsWith('/@stack'));

    if (this.smartRegistry && isRegistryPath) {
      try {
        // Convert Request to IRequestContext
        const requestContext = await this.requestToContext(request);
        const response = await this.smartRegistry.handleRequest(requestContext);
        if (response) return this.contextResponseToResponse(response);
      } catch (error) {
        console.error('[StackGalleryRegistry] Request error:', error);
        return new Response(JSON.stringify({ error: 'Internal server error' }), {
          status: 500,
          headers: { 'Content-Type': 'application/json' },
        });
      }
    }

    // Serve static UI files
    return this.serveStaticFile(path);
  }

  /**
   * Convert a Deno Request to smartregistry IRequestContext
   */
  private async requestToContext(
    request: Request,
  ): Promise<plugins.smartregistry.IRequestContext> {
    const url = new URL(request.url);
    const headers: Record<string, string> = {};
    request.headers.forEach((value, key) => {
      headers[key] = value;
    });
    const query: Record<string, string> = {};
    url.searchParams.forEach((value, key) => {
      query[key] = value;
    });

    let body: unknown = undefined;
    // deno-lint-ignore no-explicit-any
    let rawBody: any = undefined;
    if (request.body && request.method !== 'GET' && request.method !== 'HEAD') {
      try {
        const bytes = new Uint8Array(await request.arrayBuffer());
        rawBody = bytes;
        const contentType = request.headers.get('content-type') || '';
        if (contentType.includes('json')) {
          body = JSON.parse(new TextDecoder().decode(bytes));
        }
      } catch {
        // Body parsing failed, continue with undefined body
      }
    }

    // Extract token from Authorization header
    let token: string | undefined;
    const authHeader = headers['authorization'];
    if (authHeader?.startsWith('Bearer ')) {
      token = authHeader.substring(7);
    }

    return {
      method: request.method,
      path: url.pathname,
      headers,
      query,
      body,
      rawBody,
      token,
    };
  }

  /**
   * Convert smartregistry IResponse to Deno Response
   */
  private contextResponseToResponse(response: plugins.smartregistry.IResponse): Response {
    const headers = new Headers(response.headers || {});
    let body: BodyInit | null = null;

    if (response.body !== undefined) {
      if (typeof response.body === 'string') {
        body = response.body;
      } else if (response.body instanceof Uint8Array) {
        body = response.body as unknown as BodyInit;
      } else {
        body = JSON.stringify(response.body);
        if (!headers.has('content-type')) {
          headers.set('content-type', 'application/json');
        }
      }
    }

    return new Response(body, {
      status: response.status,
      headers,
    });
  }

  /**
   * Serve static files from bundled UI
   */
  private serveStaticFile(path: string): Response {
    if (!bundledFileMap) {
      return new Response('UI not bundled. Run tsbundle first.', { status: 404 });
    }

    const filePath = path === '/' ? '/index.html' : path;

    // Get bundled file
    const file = bundledFileMap.get(filePath);
    if (file) {
      return new Response(file.data as unknown as BodyInit, {
        status: 200,
        headers: { 'Content-Type': file.contentType },
      });
    }

    // SPA fallback: serve index.html for unknown paths
    const indexFile = bundledFileMap.get('/index.html');
    if (indexFile) {
      return new Response(indexFile.data as unknown as BodyInit, {
        status: 200,
        headers: { 'Content-Type': 'text/html' },
      });
    }

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

  /**
   * Handle TypedRequest calls
   */
  private async handleTypedRequest(request: Request): Promise<Response> {
    if (!this.opsServer) {
      return new Response(JSON.stringify({ error: 'OpsServer not initialized' }), {
        status: 503,
        headers: { 'Content-Type': 'application/json' },
      });
    }

    try {
      const body = await request.json();
      const result = await this.opsServer.typedrouter.routeAndAddResponse(body);
      return new Response(JSON.stringify(result), {
        status: 200,
        headers: { 'Content-Type': 'application/json' },
      });
    } catch (error) {
      console.error('[StackGalleryRegistry] TypedRequest error:', error);
      const message = error instanceof Error ? error.message : 'Internal server error';
      return new Response(
        JSON.stringify({ error: message }),
        {
          status: 500,
          headers: { 'Content-Type': 'application/json' },
        },
      );
    }
  }

  /**
   * 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...');
    if (this.opsServer) {
      await this.opsServer.stop();
    }
    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);
}

/**
 * Create registry from .nogit/env.json file (for local development)
 * Falls back to environment variables if file doesn't exist
 */
export async function createRegistryFromEnvFile(): Promise<StackGalleryRegistry> {
  const envPath = '.nogit/env.json';

  try {
    const envText = await Deno.readTextFile(envPath);
    const env = JSON.parse(envText);

    console.log('[StackGalleryRegistry] Loading config from .nogit/env.json');

    // Build S3 endpoint from host/port/ssl settings
    const s3Protocol = env.S3_USESSL ? 'https' : 'http';
    const s3Endpoint = `${s3Protocol}://${env.S3_HOST || 'localhost'}:${env.S3_PORT || '9000'}`;

    const config: IRegistryConfig = {
      mongoUrl: env.MONGODB_URL ||
        `mongodb://${env.MONGODB_USER}:${env.MONGODB_PASS}@${env.MONGODB_HOST || 'localhost'}:${
          env.MONGODB_PORT || '27017'
        }/${env.MONGODB_NAME}?authSource=admin`,
      mongoDb: env.MONGODB_NAME || 'stackgallery',
      s3Endpoint: s3Endpoint,
      s3AccessKey: env.S3_ACCESSKEY || env.S3_ACCESS_KEY || 'minioadmin',
      s3SecretKey: env.S3_SECRETKEY || env.S3_SECRET_KEY || 'minioadmin',
      s3Bucket: env.S3_BUCKET || 'registry',
      s3Region: env.S3_REGION,
      host: env.HOST || '0.0.0.0',
      port: parseInt(env.PORT || '3000', 10),
      storagePath: env.STORAGE_PATH || 'packages',
      enableUpstreamCache: env.ENABLE_UPSTREAM_CACHE !== false,
      upstreamCacheExpiry: parseInt(env.UPSTREAM_CACHE_EXPIRY || '24', 10),
      jwtSecret: env.JWT_SECRET,
    };

    return new StackGalleryRegistry(config);
  } catch (error) {
    if (error instanceof Deno.errors.NotFound) {
      console.log('[StackGalleryRegistry] No .nogit/env.json found, using environment variables');
    } else {
      console.warn(
        '[StackGalleryRegistry] Error reading .nogit/env.json, falling back to env vars:',
        error,
      );
    }
    return createRegistryFromEnv();
  }
}