require('dotenv').config();
const createApp = require('./app');

/**
 * 启动服务器
 */
function startServer() {
  const app = createApp();
  const PORT = process.env.PORT || 3000;

  const server = app.listen(PORT, () => {
    console.log('='.repeat(60));
    console.log('🚀 Steel Prices Service 已启动');
    console.log('='.repeat(60));
    console.log(`📍 服务地址: http://localhost:${PORT}`);
    console.log(`📍 Swagger文档地址: http://localhost:${PORT}/api-docs`);
    console.log(`🌍 环境: ${process.env.NODE_ENV || 'development'}`);
    console.log(`📊 API 文档: http://localhost:${PORT}/`);
    console.log('='.repeat(60));
  });

  // 优雅关闭
  const gracefulShutdown = (signal) => {
    console.log(`\n${signal} 信号收到，正在关闭服务器...`);
    server.close(() => {
      console.log('✅ 服务器已关闭');
      process.exit(0);
    });

    // 10秒后强制关闭
    setTimeout(() => {
      console.error('❌ 强制关闭服务器');
      process.exit(1);
    }, 10000);
  };

  process.on('SIGTERM', () => gracefulShutdown('SIGTERM'));
  process.on('SIGINT', () => gracefulShutdown('SIGINT'));

  // 未捕获的异常
  process.on('unhandledRejection', (reason, promise) => {
    console.error('❌ 未处理的 Promise 拒绝:', reason);
  });

  process.on('uncaughtException', (error) => {
    console.error('❌ 未捕获的异常:', error);
    process.exit(1);
  });
}

// 如果直接运行此文件
if (require.main === module) {
  startServer();
}

module.exports = startServer;