<?php
class Database
{
    public $dbh;
    private static $instance;

    private function __construct()
    {
        $this->dbType = Config::read('db.type');

        switch ($this->dbType)
        {
            case 'mysql':
                $dsn = "mysql:host=".Config::read('db.host').";dbname=".Config::read('db.basename');
                $username = Config::read('db.user');
                $password = Config::read('db.password');
                $options = array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES ".Config::read('db.charset'));
                break;
            case 'sqlite':
                $dsn = "sqlite:".Config::read('db.basename');
                break;
            case 'sqlite2':
                $dsn = "sqlite2:".Config::read('db.basename');
                break;
            case 'pgsql':
                $dsn = "pgsql:host=".Config::read('db.host').";port=".Config::read('db.port').";dbname=".Config::read('db.basename').";user=".Config::read('db.user').";password=".Config::read('db.password');
                break;
        }

        try {
            if ($this->dbType == 'pgsql')
               $this->dbh = new PDO($dsn);
            elseif ($this->dbType == 'sqlite' || $this->dbType == 'sqlite2')
               $this->dbh = new PDO($dsn);
            elseif ($this->dbType == 'mysql')
               $this->dbh = new PDO($dsn, $username, $password, $options);
        } catch (PDOException $e) {
            print 'Error!: '.$e->getMessage().'<br/>';
            die();
        }
    }

    public static function getInstance()
    {
        if ( ! isset(self::$instance))
        {
            $object = __CLASS__;
            self::$instance = new $object;
        }
        return self::$instance;
    }

    public static function getDbType()
    {
        return Database::getInstance()->dbType;
    }

    public static function getSetting($param)
    {
        if (Database::getDbType() == 'pgsql')
           $stmt = Database::getInstance()->dbh->prepare("SELECT val FROM settings WHERE key = :param");
        else
           $stmt = Database::getInstance()->dbh->prepare("SELECT `val` FROM `settings` WHERE `key` = :param");
        $stmt->bindParam(':param', $param);
        if ($stmt->execute())
        {
            foreach ($stmt as $row)
            {
                return $row['val'];
            }
            return $resultArray;
        }
        $stmt = NULL;
        $resultArray = NULL;
    }
}