import 'reflect-metadata';
import { NestFactory } from '@nestjs/core';
import { createServer } from 'node:http';
import type { NestExpressApplication } from '@nestjs/platform-express';
import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger';
import { AppModule } from './app.module';
import { MetricsService } from './metrics/metrics.service';
import { OpenApiModule } from './open-api/open-api.module';
import { configureHttpBodyParsers } from './http-body-limits';
import { configureApiHttpServerTimeouts } from './http-server-timeouts';

Object.defineProperty(BigInt.prototype, 'toJSON', {
  configurable: true,
  value(this: bigint) {
    const result = Number(this);
    if (!Number.isSafeInteger(result)) {
      throw new RangeError('金额超过 JavaScript 安全整数范围');
    }
    return result;
  },
});

async function bootstrap() {
  const app = await NestFactory.create<NestExpressApplication>(AppModule, { rawBody: true, bodyParser: false });
  app.setGlobalPrefix('api');
  configureHttpBodyParsers(app);

  const swaggerConfig = new DocumentBuilder()
    .setTitle('聆界短信平台 API')
    .setDescription('聆界短信平台 API')
    .setVersion('0.1.0')
    .build();
  const document = SwaggerModule.createDocument(app, swaggerConfig);
  SwaggerModule.setup('api/docs', app, document);

  const clientDocument = SwaggerModule.createDocument(
    app,
    new DocumentBuilder()
      .setTitle('聆界短信平台 HTTP 客户接口')
      .setDescription('单条短信发送、短信状态查询、上行短信查询及回调验签接口')
      .setVersion('1.0.0')
      .build(),
    { include: [OpenApiModule] },
  );
  clientDocument.paths = Object.fromEntries(
    Object.entries(clientDocument.paths).filter(([path]) => path.startsWith('/api/openapi/v1/')),
  );
  SwaggerModule.setup('api/client-docs', app, clientDocument, { ui: false });

  const port = Number(process.env.API_PORT ?? 3000);
  // 生产环境只允许 Nginx 访问管理 API；显式绑定回环，避免默认的全网卡监听绕过入口鉴权与限流。
  const host = process.env.API_HOST?.trim() || '127.0.0.1';
  const apiServer = await app.listen(port, host);
  configureApiHttpServerTimeouts(apiServer, process.env);

  const metrics = app.get(MetricsService);
  const metricsHost = process.env.API_METRICS_HOST?.trim() || '127.0.0.1';
  const metricsPort = Number(process.env.API_METRICS_PORT ?? 9464);
  const metricsServer = createServer((request, response) => {
    if (request.method !== 'GET' || request.url !== '/metrics') {
      response.writeHead(404).end();
      return;
    }
    response.writeHead(200, {
      'Content-Type': 'text/plain; version=0.0.4; charset=utf-8',
      'Cache-Control': 'no-store',
    });
    response.end(metrics.render());
  });
  // Metrics use a dedicated loopback listener so Nginx cannot accidentally expose them through /api/.
  await new Promise<void>((resolve, reject) => {
    metricsServer.once('error', reject);
    metricsServer.listen(metricsPort, metricsHost, resolve);
  });
}

void bootstrap();