const mariadb = require('mariadb');
require('dotenv').config();

const pool = mariadb.createPool({
    host: process.env.DB_HOST || 'maria.casademm.de',
    port: parseInt(process.env.DB_PORT) || 3306,
    user: process.env.DB_USER,
    password: process.env.DB_PASSWORD,
    database: process.env.DB_NAME,
    connectionLimit: 5
});

async function logFileAction(filename, action, user = 'anonymous') {
    let conn;
    try {
        if (!process.env.DB_USER) return;
        conn = await pool.getConnection();
        await conn.query(`
            CREATE TABLE IF NOT EXISTS file_logs (
                id INT AUTO_INCREMENT PRIMARY KEY,
                filename VARCHAR(255),
                action VARCHAR(50),
                user VARCHAR(255),
                timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP
            )
        `);
        await conn.query("INSERT INTO file_logs (filename, action, user) VALUES (?, ?, ?)", [filename, action, user]);
    } catch (err) {
        console.error("DB Error (Log):", err);
    } finally {
        if (conn) conn.end();
    }
}

async function initUserTable() {
    let conn;
    try {
        if (!process.env.DB_USER) return;
        conn = await pool.getConnection();
        await conn.query(`
            CREATE TABLE IF NOT EXISTS users (
                id INT AUTO_INCREMENT PRIMARY KEY,
                username VARCHAR(50) UNIQUE NOT NULL,
                password_hash VARCHAR(255) NOT NULL,
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
            )
        `);
        // Check if admin exists, if not create default
        const rows = await conn.query("SELECT * FROM users WHERE username = ?", ['admin']);
        if (rows.length === 0) {
            // Default password 'admin' - In production this should be changed immediately
            // Hash for 'admin': $2a$10$X7.
            // Using bcryptjs in auth route, but here we might need to manually insert if we want a default user.
            // For now, let's leave it empty and allow registration or manual insert.
            // Update: Let's actually insert a default admin/admin for the user to start.
            // hash of 'admin'
            const defaultHash = '$2a$10$w.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0'; // Placeholder, real hash in auth.js
        }
    } catch (err) {
        console.error("DB Error (Init Users):", err);
    } finally {
        if (conn) conn.end();
    }
}

module.exports = { pool, logFileAction, initUserTable };