import { NestFactory } from '@nestjs/core';
import { AppModule } from './app.module';
import { ValidationPipe, Logger, BadRequestException } from '@nestjs/common';
import helmet from 'helmet';
import { KeycloakExceptionFilter } from './filters/keycloak-exception.filter';
import { SwaggerModule, DocumentBuilder } from '@nestjs/swagger';
import { useContainer } from 'class-validator';

async function bootstrap() {
  const app = await NestFactory.create(AppModule);
  const logger = new Logger('dcb-user-service');

  useContainer(app.select(AppModule), { fallbackOnErrors: true });

  // Middlewares de sécurité
  app.use(helmet());
  app.enableCors({ 
    origin: process.env.ALLOWED_ORIGINS?.split(',') || '*',
    methods: ['GET', 'POST', 'PUT', 'DELETE', 'PATCH'],
    allowedHeaders: ['Content-Type', 'Authorization']
  });
  
  // Gestion globale des erreurs et validation
  app.useGlobalFilters(new KeycloakExceptionFilter());
  
  // ValidationPipe CORRIGÉ
  app.useGlobalPipes(new ValidationPipe({ 
    whitelist: true,
    forbidNonWhitelisted: true,
    transform: true,
    transformOptions: {
      enableImplicitConversion: true,
    },
    exceptionFactory: (errors) => {
      const messages = errors.map(error => {
        // Détails complets de l'erreur
        const constraints = error.constraints ? Object.values(error.constraints) : ['Unknown validation error'];
        return {
          field: error.property,
          errors: constraints,
          value: error.value,
          children: error.children
        };
      });
      
      console.log('🔴 VALIDATION ERRORS:', JSON.stringify(messages, null, 2));
      
      return new BadRequestException({
        message: 'Validation failed',
        errors: messages,
        details: 'Check the errors array for specific field validation issues'
      });
    }
  }));
  
  // Préfixe global de l'API
  app.setGlobalPrefix('api/v1');

  // Configuration Swagger
  const config = new DocumentBuilder()
    .setTitle('DCB User Service API')
    .setDescription('API de gestion des utilisateurs pour le système DCB')
    .setVersion('1.0')
    .addTag('users', 'Gestion des Utilisateurs')
    .addTag('partners', 'Gestion des Partenaires/Marchants')
    .addBearerAuth()
    .build();
  
  const document = SwaggerModule.createDocument(app, config);
  SwaggerModule.setup('api-docs', app, document);

  // Démarrage du serveur
  const port = process.env.PORT || 3000;
  await app.listen(port);

  logger.log(`Application running on http://localhost:${port}`);
  logger.log(`Swagger documentation available at http://localhost:${port}/api-docs`);
}
bootstrap();