/*
* Treeview 1.4 - jQuery plugin to hide and show branches of a tree
* 
* http://bassistance.de/jquery-plugins/jquery-plugin-treeview/
* http://docs.jquery.com/Plugins/Treeview
*
* Copyright (c) 2007 Jörn Zaefferer
*
* Dual licensed under the MIT and GPL licenses:
*   http://www.opensource.org/licenses/mit-license.php
*   http://www.gnu.org/licenses/gpl.html
*
* Revision: $Id: jquery.treeview.js 4684 2008-02-07 19:08:06Z joern.zaefferer $
*
*/

; (function ($) {

    $.extend($.fn, {
        swapClass: function (c1, c2) {
            var c1Elements = this.filter('.' + c1);
            this.filter('.' + c2).removeClass(c2).addClass(c1);
            c1Elements.removeClass(c1).addClass(c2);
            return this;
        },
        replaceClass: function (c1, c2) {
            return this.filter('.' + c1).removeClass(c1).addClass(c2).end();
        },
        hoverClass: function (className) {
            className = className || "hover";
            return this.hover(function () {
                $(this).addClass(className);
            }, function () {
                $(this).removeClass(className);
            });
        },
        heightToggle: function (animated, callback) {
            animated ?
                this.animate({ height: "toggle" }, animated, callback) :
                this.each(function () {
                    jQuery(this)[jQuery(this).is(":hidden") ? "show" : "hide"]();
                    if (callback)
                        callback.apply(this, arguments);
                });
        },
        heightHide: function (animated, callback) {
            if (animated) {
                this.animate({ height: "hide" }, animated, callback);
            } else {
                this.hide();
                if (callback)
                    this.each(callback);
            }
        },
        prepareBranches: function (settings) {
            if (!settings.prerendered) {
                // mark last tree items
                this.filter(":last-child:not(ul)").addClass(CLASSES.last);
                // collapse whole tree, or only those marked as closed, anyway except those marked as open
                this.filter((settings.collapsed ? "" : "." + CLASSES.closed) + ":not(." + CLASSES.open + ")").find(">ul").hide();
            }
            // return all items with sublists
            return this.filter(":has(>ul)");
        },
        applyClasses: function (settings, toggler) {
            this.filter(":has(>ul):not(:has(>a))").find(">span").click(function (event) {
                toggler.apply($(this).next());
            }).add($("a", this)).hoverClass();

            if (!settings.prerendered) {
                // handle closed ones first
                this.filter(":has(>ul:hidden)")
                        .addClass(CLASSES.expandable)
                        .replaceClass(CLASSES.last, CLASSES.lastExpandable);

                // handle open ones
                this.not(":has(>ul:hidden)")
                        .addClass(CLASSES.collapsable)
                        .replaceClass(CLASSES.last, CLASSES.lastCollapsable);

                // create hitarea
                this.prepend("<div class=\"" + CLASSES.hitarea + "\"/>").find("div." + CLASSES.hitarea).each(function () {
                    var classes = "";
                    $.each($(this).parent().attr("class").split(" "), function () {
                        classes += this + "-hitarea ";
                    });
                    $(this).addClass(classes);
                });
            }

            // apply event to hitarea
            this.find("div." + CLASSES.hitarea).click(toggler);
        },
        treeview: function (settings) {

            settings = $.extend({
                cookieId: "treeview"
            }, settings);

            if (settings.add) {
                return this.trigger("add", [settings.add]);
            }

            if (settings.toggle) {
                var callback = settings.toggle;
                settings.toggle = function () {
                    return callback.apply($(this).parent()[0], arguments);
                };
            }

            // factory for treecontroller
            function treeController(tree, control) {
                // factory for click handlers
                function handler(filter) {
                    return function () {
                        // reuse toggle event handler, applying the elements to toggle
                        // start searching for all hitareas
                        toggler.apply($("div." + CLASSES.hitarea, tree).filter(function () {
                            // for plain toggle, no filter is provided, otherwise we need to check the parent element
                            return filter ? $(this).parent("." + filter).length : true;
                        }));
                        return false;
                    };
                }
                // click on first element to collapse tree
                $("a:eq(0)", control).click(handler(CLASSES.collapsable));
                // click on second to expand tree
                $("a:eq(1)", control).click(handler(CLASSES.expandable));
                // click on third to toggle tree
                $("a:eq(2)", control).click(handler());
            }

            // handle toggle event
            function toggler() {
                $(this)
                    .parent()
                // swap classes for hitarea
                    .find(">.hitarea")
                        .swapClass(CLASSES.collapsableHitarea, CLASSES.expandableHitarea)
                        .swapClass(CLASSES.lastCollapsableHitarea, CLASSES.lastExpandableHitarea)
                    .end()
                // swap classes for parent li
                    .swapClass(CLASSES.collapsable, CLASSES.expandable)
                    .swapClass(CLASSES.lastCollapsable, CLASSES.lastExpandable)
                // find child lists
                    .find(">ul")
                // toggle them
                    .heightToggle(settings.animated, settings.toggle);
                if (settings.unique) {
                    $(this).parent()
                        .siblings()
                    // swap classes for hitarea
                        .find(">.hitarea")
                            .replaceClass(CLASSES.collapsableHitarea, CLASSES.expandableHitarea)
                            .replaceClass(CLASSES.lastCollapsableHitarea, CLASSES.lastExpandableHitarea)
                        .end()
                        .replaceClass(CLASSES.collapsable, CLASSES.expandable)
                        .replaceClass(CLASSES.lastCollapsable, CLASSES.lastExpandable)
                        .find(">ul")
                        .heightHide(settings.animated, settings.toggle);
                }
            }

            function serialize() {
                function binary(arg) {
                    return arg ? 1 : 0;
                }
                var data = [];
                branches.each(function (i, e) {
                    data[i] = $(e).is(":has(>ul:visible)") ? 1 : 0;
                });
                $.cookie(settings.cookieId, data.join(""));
            }

            function deserialize() {
                var stored = $.cookie(settings.cookieId);
                if (stored) {
                    var data = stored.split("");
                    branches.each(function (i, e) {
                        $(e).find(">ul")[parseInt(data[i]) ? "show" : "hide"]();
                    });
                }
            }

            // add treeview class to activate styles
            this.addClass("treeview");

            // prepare branches and find all tree items with child lists
            var branches = this.find("li").prepareBranches(settings);

            switch (settings.persist) {
                case "cookie":
                    var toggleCallback = settings.toggle;
                    settings.toggle = function () {
                        serialize();
                        if (toggleCallback) {
                            toggleCallback.apply(this, arguments);
                        }
                    };
                    deserialize();
                    break;
                case "location":
                    var current = this.find("a").filter(function () { return this.href.toLowerCase() == location.href.toLowerCase(); });
                    if (current.length) {
                        current.addClass("selected").parents("ul, li").add(current.next()).show();
                    }
                    break;
            }

            branches.applyClasses(settings, toggler);

            // if control option is set, create the treecontroller and show it
            if (settings.control) {
                treeController(this, settings.control);
                $(settings.control).show();
            }

            return this.bind("add", function (event, branches) {
                $(branches).prev()
                    .removeClass(CLASSES.last)
                    .removeClass(CLASSES.lastCollapsable)
                    .removeClass(CLASSES.lastExpandable)
                .find(">.hitarea")
                    .removeClass(CLASSES.lastCollapsableHitarea)
                    .removeClass(CLASSES.lastExpandableHitarea);
                $(branches).find("li").andSelf().prepareBranches(settings).applyClasses(settings, toggler);
            });
        }
    });

    // classes used by the plugin
    // need to be styled via external stylesheet, see first example
    var CLASSES = $.fn.treeview.classes = {
        open: "open",
        closed: "closed",
        expandable: "expandable",
        expandableHitarea: "expandable-hitarea",
        lastExpandableHitarea: "lastExpandable-hitarea",
        collapsable: "collapsable",
        collapsableHitarea: "collapsable-hitarea",
        lastCollapsableHitarea: "lastCollapsable-hitarea",
        lastCollapsable: "lastCollapsable",
        lastExpandable: "lastExpandable",
        last: "last",
        hitarea: "hitarea"
    };

    // provide backwards compability
    $.fn.Treeview = $.fn.treeview;

})(jQuery);