import helmet from '@fastify/helmet';
import { API_PREFIX } from '@lingxi/shared';
import { NestFactory } from '@nestjs/core';
import { FastifyAdapter, type NestFastifyApplication } from '@nestjs/platform-fastify';
import { Logger } from 'nestjs-pino';

import { AppModule } from './app.module';
import { AllExceptionsFilter } from './common/filters/all-exceptions.filter';
import { APP_CONFIG } from './config/config.module';
import type { AppConfig } from './config/env';
import { buildOpenApiDocument, setupOpenApi } from './openapi/document';

export interface CreatedApiApp {
  app: NestFastifyApplication;
  config: AppConfig;
}

/** 创建并配置 API 应用（测试与 OpenAPI 导出复用，不负责监听端口） */
export async function createApp(): Promise<CreatedApiApp> {
  const app = await NestFactory.create<NestFastifyApplication>(
    AppModule,
    new FastifyAdapter({ trustProxy: true, bodyLimit: 1024 * 1024 }),
    { bufferLogs: true },
  );

  const config = app.get<AppConfig>(APP_CONFIG);
  app.useLogger(app.get(Logger));

  app.setGlobalPrefix(API_PREFIX, { exclude: ['health'] });
  app.useGlobalFilters(new AllExceptionsFilter());
  app.enableCors({
    origin: config.webOrigins,
    credentials: true,
    methods: ['GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'OPTIONS'],
  });

  // 安全响应头；Swagger UI 需要内联脚本，CSP 在关闭文档页后再开启
  await app.register(helmet, { contentSecurityPolicy: false });
  app.enableShutdownHooks();

  return { app, config };
}

export { buildOpenApiDocument, setupOpenApi };