import { NestFactory } from '@nestjs/core';
import { ValidationPipe, Logger } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger';
import { AppModule } from './app.module';
import { AllExceptionsFilter } from './common/filters/all-exceptions.filter';
import { RedisIoAdapter } from './ws/redis-io.adapter';

async function bootstrap() {
  const logger = new Logger('Bootstrap');
  const app = await NestFactory.create(AppModule);
  const configService = app.get(ConfigService);

  // Configure Redis Adapter for horizontal scaling (if enabled)
  const redisIoAdapter = new RedisIoAdapter(app, configService);
  await redisIoAdapter.connectToRedis();
  app.useWebSocketAdapter(redisIoAdapter);

  // Enable global exception filter for consistent error responses
  app.useGlobalFilters(new AllExceptionsFilter());

  // Enable global validation pipe for DTO validation
  app.useGlobalPipes(
    new ValidationPipe({
      // Strip properties that are not in the DTO
      whitelist: true,
      // Throw error if non-whitelisted properties are present
      forbidNonWhitelisted: true,
      // Automatically transform payloads to DTO instances
      transform: true,
      // Provide detailed error messages
      disableErrorMessages: false,
    }),
  );

  // Configure Swagger documentation
  const config = new DocumentBuilder()
    .setTitle('Friendolls API')
    .setDescription(
      'API for managing users in Friendolls application.\n\n' +
        'Authentication is handled via Passport.js social sign-in for desktop clients.\n' +
        'Desktop clients exchange one-time SSO codes for Friendolls JWT tokens.\n\n' +
        'Include the JWT token in the Authorization header as: `Bearer <token>`',
    )
    .setVersion('1.0')
    .addBearerAuth(
      {
        type: 'http',
        scheme: 'bearer',
        bearerFormat: 'JWT',
        name: 'Authorization',
        description: 'Enter Friendolls JWT access token',
        in: 'header',
      },
      'bearer',
    )
    .addTag('users', 'User profile management endpoints')
    .build();

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

  const host = process.env.HOST ?? 'localhost';
  const port = process.env.PORT ?? 3000;
  await app.listen(port);

  logger.log(`Application is running on: http://${host}:${port}`);
  logger.log(`Swagger documentation available at: http://${host}:${port}/api`);
}

void bootstrap();