import { NestFactory } from '@nestjs/core';
import { SwaggerModule, DocumentBuilder } from '@nestjs/swagger';
import { AppModule } from './src/app.module';
import * as fs from 'fs';
import * as path from 'path';

async function generateOpenApi() {
  // Create app without starting the server
  const app = await NestFactory.create(AppModule, { 
    logger: false, // Suppress logs during generation
  });
  
  app.setGlobalPrefix('api');

  const config = new DocumentBuilder()
    .setTitle('DreamChat API')
    .setDescription('The DreamChat API documentation')
    .setVersion('1.0.0')
    .addBearerAuth()
    .build();
  
  const document = SwaggerModule.createDocument(app, config);
  
  // Ensure the output directory exists
  const outputDir = path.join(__dirname, '..', '..', 'openapi');
  if (!fs.existsSync(outputDir)) {
    fs.mkdirSync(outputDir, { recursive: true });
  }
  
  // Write the spec file
  const outputPath = path.join(outputDir, 'openapi.json');
  fs.writeFileSync(outputPath, JSON.stringify(document, null, 2));
  console.log(`📄 OpenAPI spec written to: ${outputPath}`);
  
  await app.close();
  process.exit(0);
}

generateOpenApi().catch((err) => {
  console.error('Failed to generate OpenAPI spec:', err);
  process.exit(1);
});