/**
 * 解锁数据库表
 * 终止所有锁定的连接并重置事务
 */

require('dotenv').config();
const mysql = require('mysql2/promise');

async function unlockTables() {
    let connection;

    try {
        // 创建数据库连接
        connection = await mysql.createConnection({
            host: process.env.DB_HOST,
            port: process.env.DB_PORT || 3306,
            user: process.env.DB_USER,
            password: process.env.DB_PASSWORD,
            database: process.env.DB_DATABASE
        });

        console.log('✅ 已连接到数据库');

        // 1. 查看当前进程
        console.log('\n📋 查看当前锁定的进程...');
        const [processes] = await connection.query('SHOW FULL PROCESSLIST');

        console.log('当前活动进程数:', processes.length);
        processes.forEach(p => {
            console.log(`  - ID: ${p.Id}, User: ${p.User}, State: ${p.State}, Info: ${p.Info}`);
        });

        // 2. 杀掉Sleep状态的连接（这些可能持有未提交的事务）
        console.log('\n🔪 终止Sleep状态的连接...');
        let killedCount = 0;
        for (const p of processes) {
            if (p.Command === 'Sleep' && p.Id !== connection.threadId) {
                try {
                    await connection.query(`KILL ${p.Id}`);
                    console.log(`  ✅ 已终止进程 ${p.Id}`);
                    killedCount++;
                } catch (err) {
                    console.log(`  ⚠️ 无法终止进程 ${p.Id}:`, err.message);
                }
            }
        }

        console.log(`\n终止了 ${killedCount} 个连接`);

        // 3. 解锁所有表
        console.log('\n🔓 解锁所有表...');
        await connection.query('UNLOCK TABLES');
        console.log('✅ 表已解锁');

        console.log('\n✅ 数据库解锁完成！');

    } catch (error) {
        console.error('❌ 解锁失败:', error.message);
        process.exit(1);
    } finally {
        if (connection) {
            await connection.end();
        }
    }
}

// 执行
unlockTables();