function showImage(id)
{
   var image_div = document.getElementById("content");
   image_div.innerHTML = HTML_AJAX.grab(encodeURI('rpc.php?action=showphoto&id=' + id));
}

function showCredits()
{
   var credits = document.getElementById("content");
   credits.innerHTML = HTML_AJAX.grab(encodeURI('rpc.php?action=showcredits'));
}

function Tags(mode, id)
{
   if(mode == "add") {
      // add the tag to users session
      HTML_AJAX.grab(encodeURI('rpc.php?action=addtag&id=' + id));
   }
   else if(mode == "del") {
      // del the tag from users session
      HTML_AJAX.grab(encodeURI('rpc.php?action=deltag&id=' + id));
   }
   else if(mode == "condition") {
      setCheckedValue(id, id.value);
      HTML_AJAX.grab(encodeURI('rpc.php?action=tagcondition&mode=' + id.value));
   }

   refreshAvailableTags();
   refreshSelectedTags();
   refreshPhotoIndex();

}

function refreshAvailableTags()
{
   // update available tags
   var avail_tags = document.getElementById('available_tags');
   avail_tags.innerHTML = "Loading...";
   avail_tags.innerHTML = HTML_AJAX.grab(encodeURI('rpc.php?action=show_available_tags'));
}

function refreshSelectedTags()
{
   // update selected tags
   var selected_tags = document.getElementById("selected_tags");
   selected_tags.innerHTML = "Loading...";
   selected_tags.innerHTML = HTML_AJAX.grab(encodeURI('rpc.php?action=show_selected_tags'));
}

function showPhotoIndex(begin_with)
{
   if(begin_with == undefined)
      HTML_AJAX.replace(document.getElementById("content"), encodeURI('rpc.php?action=show_photo_index'));
   else
      HTML_AJAX.replace(document.getElementById("content"), encodeURI('rpc.php?action=show_photo_index&begin_with=' + begin_with));
}

// if photo index is currently shown, refresh it
function refreshPhotoIndex()
{
   if(document.getElementById("matrix") != undefined || startup == 1) {
      showPhotoIndex();
      startup = 0;
   }
}

function click(object)
{
   if(object.blur)
      object.blur();

}

// set the radio button with the given value as being checked
// do nothing if there are no radio buttons
// if the given value does not exist, all the radio buttons
// are reset to unchecked
function setCheckedValue(condition, value) {

   var count = condition.length;
   if(count == undefined) {
      condition.checked = (condition.value == value.toString());
      return;
   }
   for(var i = 0; i < count; i++) {
      condition[i].checked = false;
      if(condition[i].value == value.toString()) {
         condition[i].checked = true;
      }
   }
}

function startTagSearch(searchfor)
{
   HTML_AJAX.grab(encodeURI('rpc.php?action=tag_search&for=' + searchfor));
   refreshAvailableTags();
   refreshSelectedTags();
   showPhotoIndex();
}

function startDateSearch()
{
   from_year = document.getElementById('fromyear').value;
   from_month = document.getElementById('frommonth').value;
   from_day = document.getElementById('fromday').value;
   from = from_year +"-"+ from_month +"-"+ from_day;
   to_year = document.getElementById('toyear').value;
   to_month = document.getElementById('tomonth').value;
   to_day = document.getElementById('today').value;
   to = to_year +"-"+ to_month +"-"+ to_day;

   HTML_AJAX.grab(encodeURI('rpc.php?action=date_search&from='+ from +'&to='+ to));
   
   clearSearch();
   refreshAvailableTags();
   refreshSelectedTags();
   refreshPhotoIndex();
   refreshPhotoIndex();
}

function setViewMode(mode)
{
   var exprt = document.getElementById('output');
   exprt.innerHTML = "Loading...";
   exprt.innerHTML = HTML_AJAX.grab(encodeURI('rpc.php?action=get_export&mode=' + mode));
}

function clearSearch()
{
   document.getElementsByName('searchfor')[0].value = '';
}

function AskServerWhatToDo()
{
   return HTML_AJAX.grab(encodeURI('rpc.php?action=what_to_do'));
}

function init_phpfspot()
{
   refreshAvailableTags();

   whattodo = AskServerWhatToDo();

   if(whattodo == 'showpi' || whattodo == 'showpi_date') {
      showPhotoIndex();
   }
   if(whattodo == 'showpi_tags') {
      refreshSelectedTags();
      showPhotoIndex();
   }
   if(whattodo == 'show_photo') {
      if(photo = getPhotoToShow()) {
         showImage(photo)
         refreshSelectedTags();
      }
   }
}

function setBackGrdColor(item, color)
{
   if(color == 'mouseover')
      item.style.backgroundColor='#c6e9ff';
   if(color == 'mouseout')
      item.style.backgroundColor='#eeeeee';
   if(color == 'mouseclick')
      item.style.backgroundColor='#93A8CA';
}

function getPhotoToShow()
{
   // update selected tags
   var photo_to_show = HTML_AJAX.grab(encodeURI('rpc.php?action=get_photo_to_show'));

   // if no image needs to be shown, return false from here
   if(photo_to_show == "")
      return false;
   
   return photo_to_show;
}

function showCalendar(date_box, click_obj)
{
   var calendar = document.getElementById('calendar');
   if(date_box == 'from') {
      var xpos = document.getElementById('frompic').offsetLeft;
      var ypos = document.getElementById('frompic').offsetTop;
      calendar_mode = 'from';
   }
   if(date_box == 'to') {
      var xpos = document.getElementById('topic').offsetLeft;
      var ypos = document.getElementById('topic').offsetTop;
      calendar_mode = 'to';
   }
   calendar.style.left = xpos + 60 + 'px';
   calendar.style.top = ypos + 80 + 'px';

   if(calendar.style.visibility == "" || calendar.style.visibility == 'hidden') {
      calendar.style.visibility = 'visible';
      calendar.innerHTML = "Loading...";
      calendar.innerHTML = HTML_AJAX.grab(encodeURI('rpc.php?action=get_calendar_matrix'));
      calendar_shown = 1;
   }
   else {
      calendar.style.visibility = 'hidden';
      calendar_shown = 0;
   }
}

function setMonth(year, month, day)
{
   var calendar = document.getElementById('calendar');
   calendar.innerHTML = "Loading...";
   calendar.innerHTML = HTML_AJAX.grab(encodeURI('rpc.php?action=get_calendar_matrix&year='+ year +'&month='+ month +'&day='+ day));
}

function setCalendarDate(year, month, day)
{
   document.getElementById(calendar_mode+'year').value = year;
   document.getElementById(calendar_mode+'month').value = month;
   document.getElementById(calendar_mode+'day').value = day;
}

function resetAll()
{
   HTML_AJAX.grab(encodeURI('rpc.php?action=reset'));
   clearSearch();
   refreshAvailableTags();
   refreshSelectedTags();
   refreshPhotoIndex();
}

var startup = 1;
var calendar_shown = 0;
var calendar_mode = '';