<?php

// Singleton to connect db.
class database
{
    // Hold the class instance.
    private static $instance = null;
    private $conn;

    // The db connection is established in the private constructor.
    private function __construct()
    {
        try {
            $this->conn = new PDO(
                'mysql:host=' . getenv('MYSQL_HOST') . ';dbname=' . getenv('MYSQL_DATABASE') . ';port=' . getenv('MYSQL_PORT'),
                getenv('MYSQL_USER'),
                getenv('MYSQL_PASSWORD')
            );
        } catch (PDOException $e) {
            die('Connection failed: ' . $e->getMessage());
        }
    }

    public static function getInstance()
    {
        if (!self::$instance) {
            self::$instance = new database();
        }

        return self::$instance;
    }

    public function getConnection()
    {
        return $this-> conn;
    }
}