<?php
class Database{
	private $host = DB_HOST;
	private $user = DB_USER;
	private $pass = DB_PASS;
	private $dbname = DB_NAME;

	//errorhandling variables
	private $dbh;
	private $error;

	private $stmt;

	public function __construct(){
		$dsn = 'mysql:host=' . $this->host . ';dbname=' . $this->dbname;

		//1=>Check if there's already an open connection
		//2=>Return errors as exceptions, which can be handled later on
		$options = array(
		    PDO::ATTR_PERSISTENT => true,
		    PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
		);

		//Try to connect
		try {
		    $this->dbh = new PDO($dsn, $this->user, $this->pass, $options);
		}
		catch (PDOException $e) {
		    $this->error = $e->getMessage();
		}
	}

	public function query($query){
	    $this->stmt = $this->dbh->prepare($query);
	}

	public function bind($param, $value, $type = null){
	    if (is_null($type)) {
	        switch (true) {
	            case is_int($value):
	                $type = PDO::PARAM_INT;
	                break;
	            case is_bool($value):
	                $type = PDO::PARAM_BOOL;
	                break;
	            case is_null($value):
	                $type = PDO::PARAM_NULL;
	                break;
	            default:
	                $type = PDO::PARAM_STR;
	        }
	    }
	    $this->stmt->bindValue($param, $value, $type);
	}

	public function execute(){
	    return $this->stmt->execute();
	}

	public function resultset(){
	    $this->execute();
	    return $this->stmt->fetchAll(PDO::FETCH_ASSOC);
	}

	public function single(){
	    $this->execute();
	    return $this->stmt->fetch(PDO::FETCH_ASSOC);
	}

	public function rowCount(){
	    return $this->stmt->rowCount();
	}

	public function lastInsertId(){
	    return $this->dbh->lastInsertId();
	}

	public function beginTransaction(){
	    return $this->dbh->beginTransaction();
	}

	public function endTransaction(){
	    return $this->dbh->commit();
	}

	public function cancelTransaction(){
	    return $this->dbh->rollBack();
	}

	public function debugDumpParams(){
	    return $this->stmt->debugDumpParams();
	}
}
?>