/**
 * 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
  await fastify.register(cors, {
    origin: true,
    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 authService = new AuthService(opts.db);

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

  // Yjs collaboration WebSocket
  registerYjsWebSocket(fastify);

  return fastify;
}