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

const REQUIRED_ENV_VARS = ['DATABASE_URL', 'JWT_ACCESS_SECRET'] as const;

function assertRequiredEnvVars(): void {
  const missing = REQUIRED_ENV_VARS.filter((name) => !process.env[name]);
  if (missing.length > 0) {
    throw new Error(
      `Missing required environment variable(s): ${missing.join(', ')}`,
    );
  }
}

async function bootstrap() {
  assertRequiredEnvVars();

  const app = await NestFactory.create<NestExpressApplication>(AppModule);
  app.enableShutdownHooks();

  configureApp(app);

  const swaggerConfig = new DocumentBuilder()
    .setTitle('ApiCore API')
    .setDescription('Digitale Imkereiverwaltung – API-Dokumentation')
    .setVersion('1.0')
    .addBearerAuth()
    .build();
  const swaggerDocument = SwaggerModule.createDocument(app, swaggerConfig);
  SwaggerModule.setup('api/v1/docs', app, swaggerDocument);

  await app.listen(process.env.PORT ?? 3001);
}
void bootstrap();