<?php

require_once 'dbutils.php';
require_once 'config.php';

class OsSystem {
	private static function outputEmptyImage() {
		$my_img = imagecreate( 1,1 );
		$background = imagecolorallocate( $my_img, 0, 0, 255 );
		$black = imagecolorallocate($im, 0, 0, 0);
		imagecolortransparent($my_img, $black);
		header( "Content-type: image/png" );
		imagepng( $my_img );
		imagecolordeallocate( $background );
		imagedestroy( $my_img );
	}
	
	public static function getlogo($pdo) {	
		$sql = "SELECT content as img FROM %images% WHERE name='logo'";
		self::outputImageFromDb($pdo, $sql, null);
	}
	public static function getprodimage($pdo,$prodid) {
		$sql = "SELECT content as img FROM %images% WHERE contenttype=? AND productid=?";
		$params = array(DbUtils::$TYPE_PRODIMG,$prodid);
		self::outputImageFromDb($pdo, $sql, $params);
	}
	
	private static function outputImageFromDb($pdo,$sql,$params) {
		header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
		header("Pragma: no-cache");
		header("Expires: Mon, 20 Dec 1998 01:00:00 GMT" );
		header('Content-Type: ' . image_type_to_mime_type(IMAGETYPE_PNG));

		$result = DbUtils::fetchSqlAll($pdo, $sql, $params);
		if (count($result) > 0) {
			$logoImg = $result[0]["img"];
			if ($logoImg != '') {
				$img = base64_decode($logoImg);
				$php_img = imagecreatefromstring($img);
				
				imagesavealpha($php_img, true);
				$color = imagecolorallocatealpha($php_img, 0, 0, 0, 127);
					
				imagepng($php_img, NULL);
				imagecolordeallocate( $color );
				imagedestroy($php_img);
				return;
			}
		}
		self::outputEmptyImage();
	}
	
	public static function checkLastOsAccess($pdo) {
		$timezone = self::getTimeZone($pdo);
		date_default_timezone_set($timezone);

		$sql = "SELECT date FROM %gueststatus% WHERE item=?";
		$result = DbUtils::fetchSqlAll($pdo, $sql, array('lastosaccess'));
		
		if (count($result) == 0) {
			$msg = "0";
		} else {
			$lastaccess = $result[0]["date"];

			$date = new DateTime();
			$currentTimeStamp = $date->getTimestamp();

			if (($currentTimeStamp - $lastaccess) > 60) {
				$msg = 0;
			} else {
				$msg = 1;
			}
		}
		return array("status" => "OK","msg" => $msg);
	}
	
	public static function getTimeZone($pdo) {
		$sql = "select value from %ossystem% where item=?";
		$result = DbUtils::fetchSqlAll($pdo, $sql, array("timezone"));
		if (count($result) == 1) {
			return $result[0]["value"];
		} else {
			return "Europe/Berlin";
		}
	}
}

if (isset($_GET["command"])) {
	$command = $_GET["command"];
	
	$pdo = DbUtils::openDbAndReturnPdoStatic();
	
	switch ($command) {
		case "getlastosaccess":
			$ret = OsSystem::checkLastOsAccess($pdo);
			echo json_encode($ret);
			break;
		case "getlogo":
			OsSystem::getlogo($pdo);
			break;
		case "getprodimage":
			OsSystem::getprodimage($pdo,$_GET["prodid"]);
			break;
		default:
			break;
	}
}