import mysql from 'mysql2/promise';
import { readFileSync } from 'fs';
import { join } from 'path';

// 尝试从config.json文件读取配置
let jsonConfig: any = {};

try {
  // 从项目根目录读取config.json文件
  const configPath = join(process.cwd(), 'config.json');
  const configContent = readFileSync(configPath, 'utf-8');
  jsonConfig = JSON.parse(configContent);
} catch (error) {
  console.log('⚠️ 无法读取config.json，将使用环境变量或默认值');
}

// 数据库配置
const config = {
  host: process.env.DB_HOST || jsonConfig.db?.host || 'localhost',
  port: Number(process.env.DB_PORT) || jsonConfig.db?.port || 3306,
  user: process.env.DB_USER || jsonConfig.db?.user || 'root',
  password: process.env.DB_PASSWORD || jsonConfig.db?.password || '',
  database: process.env.DB_NAME || jsonConfig.db?.database || 'protection_center',
  waitForConnections: true,
  connectionLimit: 10,
  queueLimit: 0
};

// 创建连接池
const pool = mysql.createPool(config);

// 测试数据库连接
async function testConnection() {
  try {
    const connection = await pool.getConnection();
    console.log('✅ 数据库连接成功');
    connection.release();
  } catch (error) {
    console.error('❌ 数据库连接失败:', error);
    throw error;
  }
}

export {
  pool,
  testConnection,
  config
};