import { NestFactory } from '@nestjs/core';
import { SwaggerModule, DocumentBuilder } from '@nestjs/swagger';
import { AppModule } from './app.module';
import helmet from 'helmet';
import { ConfigService } from '@nestjs/config';
import { NestExpressApplication } from '@nestjs/platform-express';

async function bootstrap() {
  const app = await NestFactory.create<NestExpressApplication>(AppModule);
  const configService = app.get(ConfigService);
  const isProduction = configService.get('app.nodeEnv') === 'production';

  app.use(helmet());

  app.setGlobalPrefix('api', { exclude: ['health', 'admin-api/(.*)', 'internal/(.*)'] });

  app.enableCors({
    origin: isProduction
      ? [configService.get('app.allowedOrigin', 'https://longde.cloud')]
      : ['https://longde.cloud', 'http://localhost:4321', 'http://localhost:5173'],
    methods: ['GET', 'POST', 'PUT', 'DELETE', 'PATCH'],
    credentials: true,
    maxAge: 86400,
  });

  app.useBodyParser('json', { limit: '10mb' });

  const swaggerEnabled = !isProduction || configService.get('app.enableSwagger') === true;
  if (swaggerEnabled) {
    const config = new DocumentBuilder()
      .setTitle('知习 API')
      .setDescription('知习 AI-first 系统化学习产品后端 API')
      .setVersion('0.1.0')
      .addBearerAuth()
      .addTag('health', '服务健康检查')
      .addTag('auth', '用户认证')
      .addTag('admin-auth', '管理员认证')
      .addTag('users', '用户管理')
      .addTag('knowledge-base', '知识库')
      .addTag('knowledge-items', '知识点')
      .addTag('document-import', '资料导入')
      .addTag('learning-session', '学习会话')
      .addTag('active-recall', '主动回忆')
      .addTag('ai-analysis', 'AI 分析')
      .addTag('review', '复习管理')
      .addTag('focus-items', '待巩固项')
      .addTag('learning-activity', '学习活跃')
      .addTag('notifications', '消息通知')
      .addTag('feedback', '用户反馈')
      .addTag('files', '文件管理')
      .addTag('waitlist', '等待名单')
      .build();

    const document = SwaggerModule.createDocument(app, config);

    if (isProduction) {
      const swaggerUser = configService.get('app.swaggerUser', 'admin');
      const swaggerPassword = configService.get('app.swaggerPassword');
      if (swaggerPassword) {
        const basicAuthMiddleware = (req: any, res: any, next: any) => {
          const auth = req.headers.authorization;
          if (!auth?.startsWith('Basic ')) {
            res.setHeader('WWW-Authenticate', 'Basic');
            return res.status(401).send('Authentication required');
          }
          const [user, pass] = Buffer.from(auth.split(' ')[1], 'base64')
            .toString()
            .split(':');
          if (user === swaggerUser && pass === swaggerPassword) {
            return next();
          }
          return res.status(401).send('Invalid credentials');
        };

        app.use('/api-docs', basicAuthMiddleware);
        app.use('/api-docs-json', basicAuthMiddleware);
      }
    }

    SwaggerModule.setup('api-docs', app, document, {
      swaggerOptions: { persistAuthorization: true },
      customCss: '.swagger-ui .topbar { display: none }',
      customSiteTitle: '知习 API 文档',
    });

    app.getHttpAdapter().get('/api-docs-json', (_req: any, res: any) => {
      res.json(document);
    });

    console.log('[Swagger] API 文档已启用');
  }

  app.enableShutdownHooks();

  const port = configService.get<number>('app.port', 3000);
  await app.listen(port);
  console.log(`[API] Server running on http://localhost:${port}`);
}
bootstrap();