// This file would typically use mysql2/promise
// import mysql from 'mysql2/promise';

// Mock DB Configuration storage (In-memory for demo, use env vars in prod)
let dbConfig = {
    host: 'localhost',
    port: 3306,
    user: 'root',
    password: '',
    database: 'edunexus'
};

// Mock Connection Pool
export const db = {
    query: async (sql: string, params?: any[]) => {
        // In a real app:
        // const connection = await mysql.createConnection(dbConfig);
        // const [rows] = await connection.execute(sql, params);
        // return rows;
        
        console.log(`[MockDB] Executing SQL: ${sql}`, params);
        return [];
    },
    testConnection: async (config: typeof dbConfig) => {
        // Simulate connection attempt
        await new Promise(resolve => setTimeout(resolve, 1000));
        if (config.host === 'error') throw new Error('Connection timed out');
        
        // Update active config
        dbConfig = config;
        return true;
    },
    getConfig: () => dbConfig
};