// jquery menu tree plugin
//
// version 1.0
//
// usage: $('.menutree').menutree( options, callback )
//
// options:  
//           menuevent                      - event to trigger expand/collapse; default = click
//           expandspeed                    - default = 500 (ms); use -1 for no animation
//           collapsespeed                  - default = 500 (ms); use -1 for no animation
//           expandeasing                   - easing function to use on expand (optional)
//           collapseeasing                 - easing function to use on collapse (optional)
//           multiopenedsubmenu             - whether or not to limit to one opened menu at a time; default = false;
//           parentmenutriggercallback      - whether or not parent menu triggers callback; default = false;
//           expandednode                   - default node to expand (optional)
//
// callback:
//           a callback function triggered with <a> 'rel' parameter.
//
// history:
//
// 1.0 - first release (28 may 2009)
//
if (jquery) (function($) {

    $.extend($.fn, {
        menutree: function(o, callback) {
            // default parameters
            if (!o) var o = {};
            o.data = this.html();
            if (o.menuevent == undefined) o.menuevent = 'click';
            if (o.expandspeed == undefined) o.expandspeed = 500;
            if (o.collapsespeed == undefined) o.collapsespeed = 500;
            if (o.expandeasing == undefined) o.expandeasing = null;
            if (o.collapseeasing == undefined) o.collapseeasing = null;
            if (o.multiopenedsubmenu == undefined) o.multiopenedsubmenu = false;
            if (o.parentmenutriggercallback == undefined) o.parentmenutriggercallback = false;
            if (o.expandednode == undefined) o.expandednode = null;

            $(this).each(function() {

                function bindtree(t) {

                    var liclickedselector = callback != undefined ? 'li > i' : 'li.parent > i';
                    
                    $(t).find(liclickedselector).bind(o.menuevent, function() {
                        currentitem = $(this);
                        if ($(this).parent().hasclass('parent')) {
                            if ($(this).parent().hasclass('expanded')) {
                                // collapse
                                $(this).parent().find('ul').slideup({ duration: o.collapsespeed, easing: o.collapseeasing });
                                $(this).parent().removeclass('expanded').addclass('collapsed');

                            } else {
                                // expand
                                if (!o.multiopenedsubmenu) {
                                    $(this).parent().parent().find('ul').slideup({ duration: o.collapsespeed, easing: o.collapseeasing });
                                    $(this).parent().parent().find('li.parent').removeclass('expanded').addclass('collapsed');
                                }
                                $($(this).parent().find("ul")[0]).slidedown({ duration: o.expandspeed, easing: o.expandeasing });
                                $(this).parent().removeclass('collapsed').addclass('expanded');
                                $(this).parent().find('li.parent').removeclass('expanded').addclass('collapsed');

                                if (o.parentmenutriggercallback)
                                    callback($(this).attr('rel'));
                            }

                        } else {
                            callback($(this).attr('rel'));
                        }
                        return false;
                    });

                    // prevent a from triggering the # on non-click events
                    if (o.menuevent.tolowercase != 'click') $(t).find(liclickedselector).bind('click', function() { return false; });
                }

                // initialization
                $($(this)).find(":first").show();
                bindtree($(this));

                // expend default node
                if (o.expandednode) {

                    var elementtoexpend = $($(this)).find("a[rel=" + o.expandednode + "]").parent().parent();

                    // collect all ul items that need to be extended
                    var ulmenuelements = new array();
                    var i = 0;
                    while (elementtoexpend && elementtoexpend.find('div').length == 0) {

                        if (elementtoexpend[0].tagname == "ul") {
                            ulmenuelements[i] = elementtoexpend;
                            i++;
                        }
                        elementtoexpend = elementtoexpend.parent();
                    }
                    ulmenuelements = ulmenuelements.reverse()

                    // extend all collected item (recursive)
                    var i = 0;
                    var openmenu = function() {

                        i++; // skip first ul(root)
                        if (i >= ulmenuelements.length) return;

                        ulmenuelements[i].removeclass('collapsed').addclass('expanded');
                        ulmenuelements[i].slidedown({ duration: o.expandspeed, easing: o.expandeasing, complete: openmenu });

                    }
                    openmenu(ulmenuelements);
                }
            });
        }
    });

})(jquery);