<?php
// Datenbank-Verbindungsparameter
require_once ('config.php');

class DbUtils {
	
	public static function openDbAndReturnPdoStatic () {
		$dsn = 'mysql:host=' . MYSQL_HOST . ';dbname=' . MYSQL_DB;
		$user = MYSQL_USER;
		$password = MYSQL_PASSWORD;
		$pdo = null;
		try {
			$pdo = new PDO($dsn, $user, $password);
			$pdo ->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
		}
		catch (PDOException $e) {
			echo 'Connection failed: ' . $e->getMessage();
		}
		return $pdo;
	}

	
	public static function substTableAlias($sqlString) {
		$out = str_replace("%ossystem%",TAB_PREFIX . 'ossystem',$sqlString);
		$out = str_replace("%gueststatus%", TAB_PREFIX . 'gueststatus',$out);
		$out = str_replace("%queue%", TAB_PREFIX . 'queue',$out);
		return $out;	
	}
	
	public static function getRowSqlObject($pdo,$sql,$params) {
		$stmt = $pdo->prepare(DbUtils::substTableAlias($sql));
		if (is_null($params)) {
			$stmt->execute();
		} else {
			$stmt->execute($params);
		}
		return ($stmt->fetchObject());
	}
	public static function fetchSqlAll($pdo,$sql,$params) {
		$stmt = $pdo->prepare(DbUtils::substTableAlias($sql));
		if (is_null($params)) {
			$stmt->execute();
		} else {
			$stmt->execute($params);
		}
		return ($stmt->fetchAll(PDO::FETCH_ASSOC));
	}
	
	public static function execSql($pdo,$sql,$params) {
		$stmt = $pdo->prepare(DbUtils::substTableAlias($sql));
		if (is_null($params)) {
			$stmt->execute();
		} else {
			$stmt->execute($params);
		}
		
	}
	
	public static function getConfigItem($pdo,$item,$default) {
		$sql = "SELECT value FROM %ossystem% WHERE item=?";
		$result = self::fetchSqlAll($pdo, $sql, array($item));
		if (count($result) == 0) {
			return $default;
		} else {
			return $result[0]["value"];
		}
	}
}