/**
 * Server – Fastify configuration with CORS, static, and WebSocket
 */
import Fastify from 'fastify';
import cors from '@fastify/cors';
import staticPlugin from '@fastify/static';
import websocket from '@fastify/websocket';
import { join, dirname } from 'path';
import { fileURLToPath } from 'url';
import type { DatabaseInterface } from './database/DatabaseInterface.js';
import { AuthService } from './auth/AuthService.js';
import { registerYjsWebSocket, initYjsPersistence, closeYjsPersistence } from './websocket/yjsServer.js';

const __dirname = dirname(fileURLToPath(import.meta.url));

export interface ServerOptions {
  port?: number;
  host?: string;
  db: DatabaseInterface;
}

export async function createServer(opts: ServerOptions) {
  const fastify = Fastify({ logger: true });

  // CORS — restrictive origin list
  await fastify.register(cors, {
    origin: (origin: string | undefined, cb: (err: Error | null, allow: boolean) => void) => {
      // Allow requests with no origin (same-origin, curl, etc.)
      if (!origin) return cb(null, true);
      // Allow known origins
      const allowed = ['https://web-cad-neu.server.media-on.de', 'http://localhost:5173', 'http://localhost:8082'];
      if (allowed.includes(origin)) return cb(null, true);
      cb(new Error('Not allowed by CORS'), false);
    },
    methods: ['GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'OPTIONS'],
  });

  // WebSocket
  await fastify.register(websocket, {
    options: { maxPayload: 1048576 },
  });

  // Static files (serve frontend build if exists)
  const frontendDist = join(__dirname, '..', '..', 'frontend', 'dist');
  try {
    await fastify.register(staticPlugin, {
      root: frontendDist,
      prefix: '/',
    });
  } catch {
    // Frontend dist may not exist in dev mode
  }

  // Health check
  fastify.get('/api/health', async () => ({ status: 'ok', timestamp: new Date().toISOString() }));

  // Register route modules
  const { registerProjectRoutes } = await import('./routes/projects.js');
  const { registerDrawingRoutes } = await import('./routes/drawings.js');
  const { registerLayerRoutes } = await import('./routes/layers.js');
  const { registerElementRoutes } = await import('./routes/elements.js');
  const { registerBlockRoutes } = await import('./routes/blocks.js');
  const { registerSettingsRoutes } = await import('./routes/settings.js');
  const { registerAuthRoutes } = await import('./routes/auth.js');
  const { registerUserRoutes } = await import('./routes/users.js');
  const { registerAIRoutes } = await import('./routes/ai.js');
  const { registerNotificationRoutes } = await import('./routes/notifications.js');
  const { registerShareRoutes } = await import('./routes/shares.js');
  const { registerGlobalBlockRoutes } = await import('./routes/globalBlocks.js');

  const authService = new AuthService(opts.db);

  // Auth middleware — protect all /api/ routes except auth login/register
  fastify.addHook('onRequest', async (request: any, reply: any) => {
    const url = request.url;
    // Skip auth endpoints and health check
    if (url === '/api/auth/login' || url === '/api/auth/register' || url === '/api/auth/logout' || url === '/api/health') return;
    // Skip non-API routes (static files, WebSocket)
    if (!url.startsWith('/api/')) return;

    const auth = request.headers.authorization;
    if (!auth || !auth.startsWith('Bearer ')) {
      return reply.code(401).send({ error: 'Authentication required' });
    }
    const token = auth.slice(7);
    const user = authService.getUserFromSession(token);
    if (!user) {
      return reply.code(401).send({ error: 'Invalid or expired session' });
    }
    (request as any).user = user;
  });

  registerAuthRoutes(fastify, authService);
  registerProjectRoutes(fastify, opts.db, authService);
  registerDrawingRoutes(fastify, opts.db, authService);
  registerLayerRoutes(fastify, opts.db, authService);
  registerElementRoutes(fastify, opts.db, authService);
  registerBlockRoutes(fastify, opts.db, authService);
  registerSettingsRoutes(fastify, opts.db, authService);
  registerUserRoutes(fastify, opts.db, authService);
  registerAIRoutes(fastify, authService);
  registerNotificationRoutes(fastify, opts.db, authService);
  registerShareRoutes(fastify, opts.db, authService);
  registerGlobalBlockRoutes(fastify, opts.db, authService);

  // Yjs collaboration WebSocket
  registerYjsWebSocket(fastify, authService);

  return fastify;
}