import 'reflect-metadata';
import { NestFactory } from '@nestjs/core';
import { createServer } from 'node:http';
import type { NestExpressApplication } from '@nestjs/platform-express';
import { GatewayCallbackModule } from './gateway-callback.module';
import { configureHttpBodyParsers } from './http-body-limits';
import { MetricsService } from './metrics/metrics.service';

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() {
  if (process.env.CMPP_PROCESS_ROLE !== 'callback') {
    throw new Error('gateway-callback requires CMPP_PROCESS_ROLE=callback');
  }
  const app = await NestFactory.create<NestExpressApplication>(GatewayCallbackModule, { rawBody: true, bodyParser: false });
  app.setGlobalPrefix('api');
  configureHttpBodyParsers(app);
  app.enableShutdownHooks();
  const host = process.env.API_CALLBACK_HOST?.trim() || '127.0.0.1';
  const port = Number(process.env.API_CALLBACK_PORT ?? 3001);
  await app.listen(port, host);

  const metrics = app.get(MetricsService);
  const metricsHost = process.env.API_CALLBACK_METRICS_HOST?.trim() || '127.0.0.1';
  const metricsPort = Number(process.env.API_CALLBACK_METRICS_PORT ?? 9468);
  const metricsServer = createServer((request, response) => {
    if (request.method !== 'GET' || request.url !== '/metrics') return void response.writeHead(404).end();
    response.writeHead(200, { 'Content-Type': 'text/plain; version=0.0.4; charset=utf-8', 'Cache-Control': 'no-store' });
    response.end(metrics.render());
  });
  await new Promise<void>((resolve, reject) => {
    metricsServer.once('error', reject);
    metricsServer.listen(metricsPort, metricsHost, resolve);
  });
}

void bootstrap();