// db.js
const mysql = require('mysql2/promise');
const path = require('path');
require('dotenv').config({ path: path.join(__dirname, '.env') });

const {
  DB_HOST = '127.0.0.1',
  DB_PORT = '3306',
  DB_USER = 'eaglertiers',
  DB_PASSWORD = 'eagler_local_dev_2026',
  DB_NAME = 'eaglertiers',
} = process.env;

// Create a connection pool (used by the app)
const pool = mysql.createPool({
  host: DB_HOST,
  port: Number(DB_PORT),
  user: DB_USER,
  password: DB_PASSWORD,
  database: DB_NAME,
  waitForConnections: true,
  connectionLimit: 10,
  queueLimit: 0,
  enableKeepAlive: true,
  keepAliveInitialDelay: 0,
});

/**
 * Ensures the database and required tables exist.
 * Call this once during server startup.
 */
async function ensureDatabase() {
  // First, connect without database to create it if necessary
  const rootPool = mysql.createPool({
    host: DB_HOST,
    port: Number(DB_PORT),
    user: DB_USER,
    password: DB_PASSWORD,
    connectionLimit: 1,
  });

  try {
    // Create database if it doesn't exist
    await rootPool.query(`CREATE DATABASE IF NOT EXISTS \`${DB_NAME}\``);
    console.log(`Database "${DB_NAME}" ensured.`);

    // Now use the main pool (with database selected) to create tables
    const connection = await pool.getConnection();

    // Create players table
    await connection.query(`
      CREATE TABLE IF NOT EXISTS players (
        id INT AUTO_INCREMENT PRIMARY KEY,
        username VARCHAR(16) UNIQUE NOT NULL,
        region VARCHAR(2) NOT NULL DEFAULT 'NA',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Create player_ranks table
    await connection.query(`
      CREATE TABLE IF NOT EXISTS player_ranks (
        player_id INT NOT NULL,
        gamemode VARCHAR(20) NOT NULL,
        tier VARCHAR(3) NOT NULL,
        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
        PRIMARY KEY (player_id, gamemode),
        FOREIGN KEY (player_id) REFERENCES players(id) ON DELETE CASCADE
      )
    `);

    // Create admin_users table (if you haven't already)
    await connection.query(`
      CREATE TABLE IF NOT EXISTS admin_users (
        id INT AUTO_INCREMENT PRIMARY KEY,
        username VARCHAR(50) UNIQUE NOT NULL,
        password_hash VARCHAR(255) NOT NULL,
        role ENUM('admin','superadmin') DEFAULT 'admin',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    connection.release();
    console.log('All tables ensured.');
  } catch (err) {
    console.error('Failed to ensure database:', err);
    throw err;
  } finally {
    await rootPool.end();
  }
}

module.exports = {
  pool,
  ensureDatabase,
};