(function($) {
  $.fn.iwBelegungsKalender = function(options) {
    var settings = $.extend({
      'numberOfMonths' : 5,
      'phpSide' : "bootstrap-occupancy/belegungskalender.php",
      'roomId' : 0,
      'language' : "de",
      'startTime' : new Date()
    }, options);

    return this.each(function() {
      var $bk = $(this);
      var startTime = new Date(settings.startTime.getFullYear(),settings.startTime.getMonth(),1);
      var time = new Date(settings.startTime.getFullYear(),settings.startTime.getMonth(),1);

      // Den Zurück-Button beim Start deaktivieren
    $('.bk_prev',$bk).addClass('disabled');
    var bk_prevIsDisabled = true;
    
      // nach dem Laden der Seite den Kalender ab dem aktuellen Monat zeigen
      $('.bk_calendar',$bk).load(settings.phpSide+"?roomid="+settings.roomId+"&month="+(time.getMonth()+1)+"&year="+time.getFullYear()+"&count="+settings.numberOfMonths+"&language="+settings.language, function(response, status, xmlHttpRequest) {
	        if(status == "error") {
	          $(this).html("<div class=\"bk_error\">Sorry but there was an error.<br />"+xmlHttpRequest.status+" "+xmlHttpRequest.statusText+"</div>");
	        }
	        
	        /*
	         * ... von Jan eingefügt
	         */
	        if(response.indexOf("error") != -1) {
	        	$(this).parent().find('.bk_prev').hide();
	        	$(this).parent().find('.bk_next').hide();
	        };
	        
	        $('[data-toggle="tooltip"]').tooltip();
	        /*
	         * ... nur widget wenn bookingcalendar als Paramter mit übergeben wird
	         */
	        	        
	        if(location.search.indexOf("bookingcalendar") != -1){		        	        	
	        	parent.postMessage(String(document.body.offsetHeight), parentHost);
	        	//ri.allowResponsiveEmbedding();
	        }
        
      });

      // Previous-Link
      $('.bk_prev',$bk).click(function() {
        time = prevMonth(time);
        if(bk_prevIsDisabled==false && time<=startTime) {
          $('.bk_prev',$bk).addClass('disabled');
      bk_prevIsDisabled = true;
        }
        $('.bk_calendar',$bk).load(settings.phpSide+"?roomid="+settings.roomId+"&month="+(time.getMonth()+1)+"&year="+time.getFullYear()+"&count="+settings.numberOfMonths+"&language="+settings.language, function(response, status, xmlHttpRequest) {
          if(status == "error") {
            $(this).html("<div class=\"bk_error\">Sorry but there was an error.<br />"+xmlHttpRequest.status+" "+xmlHttpRequest.statusText+"</div>");
          }
        });
        $(this).blur();
        return false;
      });

      // Next-Link
      $('.bk_next',$bk).click(function() {
        time = nextMonth(time);
    if(bk_prevIsDisabled && time>startTime) {
          $('.bk_prev',$bk).removeClass('disabled');
      bk_prevIsDisabled = false;
        }
        $('.bk_calendar',$bk).load(settings.phpSide+"?roomid="+settings.roomId+"&month="+(time.getMonth()+1)+"&year="+time.getFullYear()+"&count="+settings.numberOfMonths+"&language="+settings.language, function(response, status, xmlHttpRequest) {
          if(status == "error") {
            $(this).html("<div class=\"bk_error\">Sorry but there was an error.<br />"+xmlHttpRequest.status+" "+xmlHttpRequest.statusText+"</div>");
          }
        });
        $(this).blur();
        return false;
    });
    });
  };
})(jQuery);


function prevMonth(time) {
  var month = time.getMonth();
  var year = time.getFullYear();
  month = month - 1;
  if(month < 0) {
    month = 11;
    year = year - 1;
  }
  time.setMonth(month);
  time.setFullYear(year);
  return time;
}

function nextMonth(time) {
  var month = time.getMonth();
  var year = time.getFullYear();
  month = month + 1;
  if(month > 11) {
    month = 0;
    year = year + 1;
  }
  time.setMonth(month);
  time.setFullYear(year);
  return time;
}