/*
 * jQuery UI Accordion 1.6
 * 
 * Copyright (c) 2007 Jörn Zaefferer
 *
 * http://docs.jquery.com/UI/Accordion
 *
 * 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.accordion.js 4876 2008-03-08 11:49:04Z joern.zaefferer $
 *
 */

;(function($) {
        
// If the UI scope is not available, add it
$.ui = $.ui || {};

$.fn.extend({
        accordion: function(options, data) {
                var args = Array.prototype.slice.call(arguments, 1);

                return this.each(function() {
                        if (typeof options == "string") {
                                var accordion = $.data(this, "ui-accordion");
                                accordion[options].apply(accordion, args);
                        // INIT with optional options
                        } else if (!$(this).is(".ui-accordion"))
                                $.data(this, "ui-accordion", new $.ui.accordion(this, options));
                });
        },
        // deprecated, use accordion("activate", index) instead
        activate: function(index) {
                return this.accordion("activate", index);
        }
});

$.ui.accordion = function(container, options) {
        
        // setup configuration
        this.options = options = $.extend({}, $.ui.accordion.defaults, options);
        this.element = container;
        
        $(container).addClass("ui-accordion");
        
        if ( options.navigation ) {
                var current = $(container).find("a").filter(options.navigationFilter);
                if ( current.length ) {
                        if ( current.filter(options.header).length ) {
                                options.active = current;
                        } else {
                                options.active = current.parent().parent().prev();
                                current.addClass("current");
                        }
                }
        }
        
        // calculate active if not specified, using the first header
        options.headers = $(container).find(options.header);
        options.active = findActive(options.headers, options.active);
        if( options.startClosed == true ) {
                options.active = $([]);
        }

        if ( options.fillSpace ) {
                var maxHeight = $(container).parent().height();
                options.headers.each(function() {
                        maxHeight -= $(this).outerHeight();
                });
                var maxPadding = 0;
                options.headers.next().each(function() {
                        maxPadding = Math.max(maxPadding, $(this).innerHeight() - $(this).height());
                }).height(maxHeight - maxPadding);
        } else if ( options.autoheight ) {
                var maxHeight = 0;
                options.headers.next().each(function() {
                        maxHeight = Math.max(maxHeight, $(this).outerHeight());
                }).height(maxHeight);
        }

        options.headers
                .not(options.active || "")
                .next()
                .hide();
        options.active.parent().andSelf().addClass(options.selectedClass);
        
        if (options.event)
                $(container).bind((options.event) + ".ui-accordion", clickHandler);
};

$.ui.accordion.prototype = {
        activate: function(index) {
                // call clickHandler with custom event
                clickHandler.call(this.element, {
                        target: findActive( this.options.headers, index )[0]
                });
        },
        
        enable: function() {
                this.options.disabled = false;
        },
        disable: function() {
                this.options.disabled = true;
        },
        destroy: function() {
                this.options.headers.next().css("display", "");
                if ( this.options.fillSpace || this.options.autoheight ) {
                        this.options.headers.next().css("height", "");
                }
                $.removeData(this.element, "ui-accordion");
                $(this.element).removeClass("ui-accordion").unbind(".ui-accordion");
        }
}

function scopeCallback(callback, scope) {
        return function() {
                return callback.apply(scope, arguments);
        };
}

function completed(cancel) {
        // if removed while animated data can be empty
        if (!$.data(this, "ui-accordion"))
                return;
        var instance = $.data(this, "ui-accordion");
        var options = instance.options;
        options.running = cancel ? 0 : --options.running;
        if ( options.running )
                return;
        if ( options.clearStyle ) {
                options.toShow.add(options.toHide).css({
                        height: "",
                        overflow: ""
                });
        }
        $(this).triggerHandler("change.ui-accordion", [options.data], options.change);
}

function toggle(toShow, toHide, data, clickedActive, down) {
        var options = $.data(this, "ui-accordion").options;
        options.toShow = toShow;
        options.toHide = toHide;
        options.data = data;
        var complete = scopeCallback(completed, this);
        
        // count elements to animate
        options.running = toHide.size() == 0 ? toShow.size() : toHide.size();
        
        if ( options.animated ) {
                if ( !options.alwaysOpen && clickedActive ) {
                        $.ui.accordion.animations[options.animated]({
                                toShow: jQuery([]),
                                toHide: toHide,
                                complete: complete,
                                down: down,
                                autoheight: options.autoheight
                        });
                } else {
                        $.ui.accordion.animations[options.animated]({
                                toShow: toShow,
                                toHide: toHide,
                                complete: complete,
                                down: down,
                                autoheight: options.autoheight
                        });
                }
        } else {
                if ( !options.alwaysOpen && clickedActive ) {
                        toShow.toggle();
                } else {
                        toHide.hide();
                        toShow.show();
                }
                complete(true);
        }
}

function clickHandler(event) {
        var options = $.data(this, "ui-accordion").options;
        if (options.disabled)
                return false;
        
        // called only when using activate(false) to close all parts programmatically
        if ( !event.target && !options.alwaysOpen ) {
                options.active.parent().andSelf().toggleClass(options.selectedClass);
                var toHide = options.active.next(),
                        data = {
                                instance: this,
                                options: options,
                                newHeader: jQuery([]),
                                oldHeader: options.active,
                                newContent: jQuery([]),
                                oldContent: toHide
                        },
                        toShow = options.active = $([]);
                toggle.call(this, toShow, toHide, data );
                return false;
        }
        // get the click target
        var clicked = $(event.target);
        
        // due to the event delegation model, we have to check if one
        // of the parent elements is our actual header, and find that
        if ( clicked.parents(options.header).length )
                while ( !clicked.is(options.header) )
                        clicked = clicked.parent();
        
        var clickedActive = clicked[0] == options.active[0];
        
        // if animations are still active, or the active header is the target, ignore click
        if (options.running || (options.alwaysOpen && clickedActive))
                return false;
        if (!clicked.is(options.header))
                return;

        // switch classes
        options.active.parent().andSelf().toggleClass(options.selectedClass);
        if ( !clickedActive ) {
                clicked.parent().andSelf().addClass(options.selectedClass);
        }

        // find elements to show and hide
        var toShow = clicked.next(),
                toHide = options.active.next(),
                //data = [clicked, options.active, toShow, toHide],
                data = {
                        instance: this,
                        options: options,
                        newHeader: clicked,
                        oldHeader: options.active,
                        newContent: toShow,
                        oldContent: toHide
                },
                down = options.headers.index( options.active[0] ) > options.headers.index( clicked[0] );
        
        options.active = clickedActive ? $([]) : clicked;
        toggle.call(this, toShow, toHide, data, clickedActive, down );

        return false;
};

function findActive(headers, selector) {
        //return selector != undefined
        return selector != undefined
                ? typeof selector == "number"
                        ? headers.filter(":eq(" + selector + ")")
                        : headers.not(headers.not(selector))
                : selector === false
                        ? $([])
                        : headers.filter(":eq(0)");
}

$.extend($.ui.accordion, {
        defaults: {
                selectedClass: "selected",
                alwaysOpen: true,
                animated: 'slide',
                event: "click",
                header: "a",
                autoheight: true,
                running: 0,
                navigationFilter: function() {
                        return this.href.toLowerCase() == location.href.toLowerCase();
                }
        },
        animations: {
                slide: function(options, additions) {
                        options = $.extend({
                                easing: "swing",
                                duration: 300
                        }, options, additions);
                        if ( !options.toHide.size() ) {
                                options.toShow.animate({height: "show"}, options);
                                return;
                        }
                        var hideHeight = options.toHide.height(),
                                showHeight = options.toShow.height(),
                                difference = showHeight / hideHeight;
                        options.toShow.css({ height: 0, overflow: 'hidden' }).show();
                        options.toHide.filter(":hidden").each(options.complete).end().filter(":visible").animate({height:"hide"},{
                                step: function(now) {
                                        var current = (hideHeight - now) * difference;
                                        if ($.browser.msie || $.browser.opera) {
                                                current = Math.ceil(current);
                                        }
                                        options.toShow.height( current );
                                },
                                duration: options.duration,
                                easing: options.easing,
                                complete: function() {
                                        if ( !options.autoheight ) {
                                                options.toShow.css("height", "auto");
                                        }
                                        options.complete();
                                }
                        });
                },
                bounceslide: function(options) {
                        this.slide(options, {
                                easing: options.down ? "bounceout" : "swing",
                                duration: options.down ? 1000 : 200
                        });
                },
                easeslide: function(options) {
                        this.slide(options, {
                                easing: "easeinout",
                                duration: 700
                        })
                }
        }
});

})(jQuery);