<?php
declare(strict_types=1);

define('DB_HOST', '127.0.0.1');
define('DB_PORT', '3306');
define('DB_NAME', 'srikubera');
define('DB_USER', 'srikubera');
define('DB_PASS', 'srikubera');
define('DB_CHARSET', 'utf8mb4');

function getDbConnection(): PDO
{
    static $pdo = null;

    if ($pdo === null) {
        $dsn = sprintf('mysql:host=%s;port=%s;dbname=%s;charset=%s', DB_HOST, DB_PORT, DB_NAME, DB_CHARSET);
        $options = [
            PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
            PDO::ATTR_EMULATE_PREPARES   => false,
        ];

        try {
            $pdo = new PDO($dsn, DB_USER, DB_PASS, $options);
        } catch (PDOException $e) {
            error_log('Database connection error: ' . $e->getMessage());
            die(json_encode(['success' => false, 'message' => 'Service temporarily unavailable.']));
        }
    }

    return $pdo;
}