<?php

/**
 * Singleton Class Database used to connect to the database while only making one connection
 * @author Wesley Klop<wesley19097@gmail.com>
 */
final class Database
{
    /** @var PDO $dbh */
    private static $dbh;
    /** @var string $username */
    private static $username = '';
    /** @var string $password */
    private static $password = '';
    /** @var string $dsn */
    private static $dsn = "mysql:host=localhost;dbname=" . self::$username . ";charset=UTF8";
    /** @var array $options */
    private static $options = array(
        PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES 'utf8'",
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
    );

    /** @ignore */
    public function __construct()
    {
    }

    /** @ignore */
    public function __clone()
    {
    }

    /**
     * @return PDO $dbh database handle
     * @throws PDOException
     */
    public static function getInstance()
    {
        if (!(self::$dbh instanceof PDO)) {
            self::$dbh = new PDO(self::$dsn, self::$username, self::$password, self::$options);
        }
        return self::$dbh;
    }
}