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

class DbUtils {
	private static $timezone = null;
	private static $prefix = null;
	
	public static function overruleTimeZone($timezone) {
		self::$timezone = $timezone;
	}
	public static function overrulePrefix($prefix) {
		self::$prefix = $prefix;
	}
	
	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;
	}
	function openDbAndReturnPdo () {
		$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;
	}
	
	function testDbAccess($host,$dbname,$user,$pass) {
		$dsn = 'mysql:host=' . $host . ';dbname=' . $dbname;
		$password = $pass;
		$pdo = null;
		try {
			$pdo = new PDO($dsn, $user, $password);
			$pdo ->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
		}
		catch (PDOException $e) {
			//
		}
		if ($pdo != null) {
			return true;
		} else {
			return false;
		}
	}
	
	/*
	 * To use sql strings that are easy to read the table names are used
	 * without variables. But since the user can specify a prefix for all
	 * tables the substitution must be done somewhere. This is the function
	 * that replaces the %TABLE% by $prefix_table
	 */
	public static function substTableAlias($sqlString) {
		$prefix = TAB_PREFIX;
		if (!is_null(self::$prefix)) {
			$prefix = self::$prefix;
		}
		return self::substTableAliasCore($sqlString, $prefix);
	}
	
	public static function substTableAliasCore($sqlString,$prefix) {
		$out = str_replace("%queue%",$prefix . 'queue',$sqlString);
		$out = str_replace("%products%",$prefix . 'products',$out);
		$out = str_replace("%user%",$prefix . 'user',$out);
		$out = str_replace("%room%",$prefix . 'room',$out);
		$out = str_replace("%resttables%",$prefix . 'resttables',$out);
		$out = str_replace("%bill%",$prefix . 'bill',$out);
		$out = str_replace("%customerlog%", $prefix . 'customerlog', $out);
		$out = str_replace("%customers%",$prefix . 'customers',$out);
		$out = str_replace("%groups%",$prefix . 'groups',$out);
		$out = str_replace("%groupcustomer%",$prefix . 'groupcustomer',$out);
		$out = str_replace("%vacations%", $prefix .'vacations',$out);
		$out = str_replace("%tablemaps%",$prefix . "tablemaps",$out);
		$out = str_replace("%tablepos%",$prefix . "tablepos",$out);
		
		$out = str_replace("%pricelevel%",$prefix . 'pricelevel',$out);
		$out = str_replace("%config%",$prefix . 'config',$out);
		$out = str_replace("%closing%",$prefix . 'closing',$out);
		$out = str_replace("%printjobs%",$prefix . 'printjob',$out);
		
		$out = str_replace("%hist%",$prefix . 'hist',$out);
		$out = str_replace("%histprod%",$prefix . 'histprod',$out);
		$out = str_replace("%histconfig%",$prefix . 'histconfig',$out);
		$out = str_replace("%histuser%",$prefix . 'histuser',$out);
		$out = str_replace("%histactions%",$prefix . 'histactions',$out);
		$out = str_replace("%payment%",$prefix . 'payment',$out);
		$out = str_replace("%billproducts%", $prefix . 'billproducts',$out);
		$out = str_replace("%work%",$prefix . 'work',$out);
		$out = str_replace("%comments%",$prefix . 'comments',$out);
		$out = str_replace("%hsin%",$prefix . 'hsin',$out);
		$out = str_replace("%hsout%",$prefix . 'hsout',$out);
		
		$out = str_replace("%reservations%",$prefix . 'reservations',$out);
		$out = str_replace("%logo%",$prefix . 'logo',$out);
		$out = str_replace("%log%",$prefix . 'log',$out);
		$out = str_replace("%extras%", $prefix . 'extras',$out);
		$out = str_replace("%extrasprods%",$prefix . 'extrasprods', $out);
		$out = str_replace("%queueextras%",$prefix . 'queueextras', $out);
		$out = str_replace("%ratings%",$prefix . 'ratings', $out);
		$out = str_replace("%prodimages%",$prefix . 'prodimages', $out);
		
		return (str_replace("%prodtype%",$prefix . 'prodtype',$out));			
	}
	
	public function resolveTablenamesInSqlString($sqlString) {
		return DbUtils::substTableAlias($sqlString);
	}
	
	public static function getTimeZone() {
		if (is_null(self::$timezone)) {
			if(session_id() == '') {
				session_start();
			}
			if (isset($_SESSION['timezone'])) {
				return $_SESSION['timezone'];
			} else {
				return "Europe/Berlin";
			}
		} else {
			return self::$timezone;
		}
	}
        
        public static $userCols = array(
            array("col" => 'id',                "hist" => 1, "new" => null,				    "update" => null),
            array("col" => 'username',          "hist" => 1, "new" => 'username',			    "update" => null),
            array("col" => 'userpassword',      "hist" => 0, "new" => null,				    "update" => null),
            array("col" => 'is_admin',          "hist" => 1, "new" => 'isAdmin',			    "update" => 'isAdmin'),
            array("col" => 'right_waiter',      "hist" => 1, "new" => 'rWaiter',			    "update" => 'rWaiter'),
            array("col" => 'right_kitchen',     "hist" => 1, "new" => 'rKitchen',			    "update" => 'rKitchen'),
            array("col" => 'right_bar',         "hist" => 1, "new" => 'rBar',				    "update" => 'rBar'),
            array("col" => 'right_supply',      "hist" => 1, "new" => 'rSupply',			    "update" => 'rSupply'),
            array("col" => 'right_paydesk',     "hist" => 1, "new" => 'rPayDesk',			    "update" => 'rPayDesk'),
            array("col" => 'right_statistics',  "hist" => 1, "new" => 'rStat',				    "update" => 'rStat'),
            array("col" => 'right_bill',        "hist" => 1, "new" => 'rBill',				    "update" => 'rBill'),
            array("col" => 'right_products',    "hist" => 1, "new" => 'rProducts',			    "update" => 'rProducts'),
            array("col" => 'right_reservation', "hist" => 1, "new" => 'rReservation',			    "update" => 'rReservation'),
            array("col" => 'right_rating',      "hist" => 1, "new" => 'rRating',			    "update" => 'rRating'),
            array("col" => 'right_changeprice', "hist" => 1, "new" => 'rChangeprice',			    "update" => 'rChangeprice'),
	    array("col" => 'right_customers',	"hist" => 1, "new" => 'rCustomers',			    "update" => 'rCustomers'),
            array("col" => 'right_manager',     "hist" => 1, "new" => 'rManager',			    "update" => 'rManager'),
	    array("col" => 'right_closing',     "hist" => 1, "new" => 'rClosing',			    "update" => 'rClosing'),
	    array("col" => 'right_dash',	"hist" => 1, "new" => 'rDash',				    "update" => 'rDash'),
            array("col" => 'active',            "hist" => 1, "new" => null	    ,"default" => 1,	    "update" => null),
            array("col" => 'lastmodule',        "hist" => 0, "new" => null	    ,"default" => null,	    "update" => null),
            array("col" => 'ordervolume',       "hist" => 0, "new" => null	    ,"default" => null,	    "update" => null),
            array("col" => 'language',          "hist" => 0, "new" => null,				    "update" => null),
            array("col" => 'receiptprinter',    "hist" => 0, "new" => null	    ,"default" => null,	    "update" => null),
            array("col" => 'roombtnsize',       "hist" => 0, "new" => null	    ,"default" => null,	    "update" => null),
            array("col" => 'tablebtnsize',      "hist" => 0, "new" => null	    ,"default" => null,	    "update" => null),
            array("col" => 'prodbtnsize',       "hist" => 0, "new" => null	    ,"default" => null,	    "update" => null),
            array("col" => 'prefertablemap',    "hist" => 0, "new" => null	    ,"default" => 1,	    "update" => null),
	    array("col" => 'preferimgdesk',     "hist" => 0, "new" => null	    ,"default" => null,	    "update" => null),
	    array("col" => 'preferimgmobile',   "hist" => 0, "new" => null	    ,"default" => null,	    "update" => null),
            array("col" => 'keeptypelevel',     "hist" => 0, "new" => null	    ,"default" => 0,	    "update" => null),
            array("col" => 'extrasapplybtnpos', "hist" => 0, "new" => null	    ,"default" => 1,	    "update" => null)
        );
        
									
        public static $prodCols = array(
            array("col" => 'id',                "hist" => 1,	"property" => "prodid"),
            array("col" => 'shortname',         "hist" => 1,	"property" => "shortName"),
            array("col" => 'longname',          "hist" => 1,	"property" => "longName"),
            array("col" => 'priceA',            "hist" => 1,	"property" => "priceA"),
            array("col" => 'priceB',            "hist" => 1,	"property" => "priceB"),
            array("col" => 'priceC',            "hist" => 1,	"property" => "priceC"),
	    array("col" => 'unit',		"hist" => 1,	"property" => "unit"),
	    array("col" => 'days',		"hist" => 1,	"property" => "days"),
            array("col" => 'tax',               "hist" => 1,	"property" => "tax"),
	    array("col" => 'taxaustria',        "hist" => 1,	"property" => "taxaustria"),
	    array("col" => 'amount',	        "hist" => 0,	"property" => "amount"),
            array("col" => 'category',          "hist" => 0,	"property" => "category"),
            array("col" => 'favorite',          "hist" => 1,	"property" => "favorite"),
            array("col" => 'sorting',           "hist" => 1),
            array("col" => 'available',         "hist" => 1,	"property" => "available"),
            array("col" => 'audio',             "hist" => 1,	"property" => "audio"),
	    array("col" => 'prodimageid',       "hist" => 1,	"property" => "prodimageid"),
            array("col" => 'removed',           "hist" => 0)
        );
}