const db = require('../config/database');

async function migrate() {
    console.log('开始执行 v3 迁移: 创建 teachers 表...');
    
    try {
        await db.query(`
            CREATE TABLE IF NOT EXISTS teachers (
                id TEXT PRIMARY KEY,
                name TEXT NOT NULL,
                department TEXT,
                title TEXT,
                contact_info TEXT,
                FOREIGN KEY (id) REFERENCES users(id) ON DELETE CASCADE
            )
        `);

        // 从 users 表中迁移现有的教师数据
        const teachers = await db.query('SELECT id, name, class FROM users WHERE role = "teacher"');
        for (const t of teachers) {
            await db.query(
                'INSERT OR IGNORE INTO teachers (id, name, department) VALUES (?, ?, ?)',
                [t.id, t.name, t.class]
            );
        }

        console.log('v3 迁移成功！');
    } catch (err) {
        console.error('v3 迁移失败:', err);
    }
}

migrate();