const mariadb = require('mariadb');

// 创建一个连接池
const pool = mariadb.createPool({
    host: 'localhost',
    user: 'rc',
    password: '1q3e@W$R',
    database: 'Card'
  });
  
  // 获取连接
  async function getConnection() {
    let conn;
    try {
        conn = await pool.getConnection();
        console.log("Connected to the database!");
    } catch (err) {
        console.error("Error connecting to the database:", err);
    }
    return conn;
  }
  
  // async function insertData(conn) {
  //   const query = "INSERT INTO your_table (column1, column2) VALUES (?, ?)";
  //   const values = ['value1', 'value2'];
  //   try {
  //       const result = await conn.query(query, values);
  //       console.log(`Inserted with ID: ${result.insertId}`);
  //   } catch (err) {
  //       console.error("Error inserting data:", err);
  //   }
  // }
  
  async function fetchData(conn) {
    const query = "SELECT * FROM your_table";
    try {
        const rows = await conn.query(query);
        console.log(rows);
    } catch (err) {
        console.error("Error fetching data:", err);
    }
  }
  
  async function isRoomAvailable(conn, roomId) {
    const query = "SELECT 1 FROM Room WHERE RoomID = ? AND Status = 0 LIMIT 1";
    try {
      const rows = await conn.query(query, [roomId]);
      if (rows.length === 0) {
        // 不存在或已被占用
        return false;
      }
  
      // 执行更新
      const updateQuery = "UPDATE Room SET Status = 1 WHERE RoomID = ?";
      const result = await conn.query(updateQuery, [roomId]);
  
      // 检查是否更新了1行
      return Number(result.affectedRows) === 1;
    } catch (err) {
      console.error("Error checking room availability:", err);
      return false;
    }
  }

  module.exports = {
    getConnection,
    isRoomAvailable
  };