var flickrpress_positions = new Array();

function flickrpress_load_items(direction, sender) {
   var container = jQuery(sender).parent().parent();
   var items = container.find('.flickrpress-items');
   var options = container.find('[name=flickrpress-options]').val();
   var id = container.find('[name=flickrpress-id]').val();
   var prev = container.find('.flickrpress-navigation-previous');
   var next = container.find('.flickrpress-navigation-next');
   
   var start = flickrpress_positions[container];
   if ( !start ) start = 0;
   
   container.addClass("pending");
   jQuery.getJSON('', { flickrpress_action: direction, 
                        flickrpress_options: options, 
                        flickrpress_id: id,
                        flickrpress_start: start }, function(result) {
                           
      if ( parseInt(result.count) == 0 ) {
         alert('Flickr is currently unavailable.');
         container.removeClass("pending");
         return;
      }
      var start = flickrpress_positions[container] = parseInt(result.start);
      var count = parseInt(result.count);
      if ( start+count >= parseInt(result.total) ) {
         next.hide();
      } else {
         next.show();
      }
      
      if ( start == 0 ) {
         prev.hide();
      } else {
         prev.show();
      }

      container.removeClass("pending");
            
      items.html(result.html);
      if ( typeof(myLightbox) != 'undefined' && typeof(myLightbox.updateImageList) == 'function' ) {
         myLightbox.updateImageList();
      }
      if ( typeof(tb_init) == 'function' ) {
         tb_init('a.thickbox');
      }
   });
}

jQuery(function() {
   jQuery('.flickrpress-navigation .flickrpress-navigation-previous').click(function() { flickrpress_load_items('lastpage', this); });
   jQuery('.flickrpress-navigation .flickrpress-navigation-next').click(function() { flickrpress_load_items('nextpage', this); });
});