$(function() {
    var $agenda_list = $('ol.agenda_list');
    
    var rebuildOpenersClosers = function ( ) {
        $agenda_list.find("li").each(function() {
            var $li = $(this);
            if ($li.find("> ol").length > 0) $li.find("> div .opener_closer").show();
            else $li.find("> div .opener_closer").hide();
        });
    }
    
    var rebuildNesting = function( $root, level, parent_id ) {
        var $children = $root.find('> li'),
            curr_weight = -50;
        
        $children.each(function() {
            var $child = $(this),
                $curr_element = $child.find('> div'),
                my_id = $curr_element.find('.menu-mlid').val();
            
            $curr_element.find('.menu-plid').val(parent_id);
            $curr_element.find('.menu-weight').val(curr_weight);
            curr_weight++;
            
            $child.find('> ol').each(function() {
                rebuildNesting( $(this), level + 1, my_id );
            });
            
        });
        
    };
    
    if ($agenda_list.hasClass("sortable")) $agenda_list.nestedSortable({
        forcePlaceholderSize: true,
        handle: 'div',
        helper:    'clone',
        items: 'li',
        opacity: .6,
        placeholder: 'placeholder',
        revert: 250,
        tabSize: 25,
        tolerance: 'pointer',
        toleranceElement: '> div',
        isTree: true,
        expandOnHover: 700,
        startCollapsed: true,
        update: function (event, ui) {
            var $this = $(this);
            rebuildNesting($this, 0, 0);
            $('#changed-order-message').show();
            rebuildOpenersClosers();
        }
    });
    
    rebuildOpenersClosers();
    
    $agenda_list.find(".opener_closer .opener").click(function(ev) {
        ev.preventDefault();
        $(this).parents("li").first().removeClass("closed");
    });
    $agenda_list.find(".opener_closer .closer").click(function(ev) {
        ev.preventDefault();
        $(this).parents("li").first().addClass("closed");
    });
});