/*
 * jQuery UI Accordion
 * 
 * Copyright (c) 2007, 2008 Jörn Zaefferer
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * http://docs.jquery.com/UI/Accordion
 *
 * Depends:
 *    ui.core.js
 */
(function($) {
$.widget("ui.accordion", {
    init: function() {
        var options = this.options;
        
        if ( options.navigation ) {
            var current = this.element.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 = this.element.find(options.header);
        options.active = findActive(options.headers, options.active);
        
        // IE7-/Win - Extra vertical space in Lists fixed
        if ($.browser.msie) {
            this.element.find('a').css('zoom', '1');
        }
        
        if (!this.element.hasClass("ui-accordion")) {
            this.element.addClass("ui-accordion");
            $("<span class='ui-accordion-left'/>").insertBefore(options.headers);
            $("<span class='ui-accordion-right'/>").appendTo(options.headers);
            options.headers.addClass("ui-accordion-header").attr("tabindex", "0");
        }
        
        var maxHeight;
        if ( options.fillSpace ) {
            maxHeight = this.element.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 ) {
            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) {
            this.element.bind((options.event) + ".accordion", clickHandler);
        }
    },
    activate: function(index) {
        // call clickHandler with custom event
        clickHandler.call(this.element[0], {
            target: findActive( this.options.headers, index )[0]
        });
    },
    destroy: function() {
        this.options.headers.next().css("display", "");
        if ( this.options.fillSpace || this.options.autoHeight ) {
            this.options.headers.next().css("height", "");
        }
        $.removeData(this.element[0], "accordion");
        this.element.removeClass("ui-accordion").unbind(".accordion");
    }
});
function scopeCallback(callback, scope) {
    return function() {
        return callback.apply(scope, arguments);
    };
};
function completed(cancel) {
    // if removed while animated data can be empty
    if (!$.data(this, "accordion")) {
        return;
    }
    
    var instance = $.data(this, "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: ""
        });
    }
    $(this).triggerHandler("accordionchange", [$.event.fix({type: 'accordionchange', target: instance.element[0]}), options.data], options.change);
}
function toggle(toShow, toHide, data, clickedActive, down) {
    var options = $.data(this, "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, "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 = {
                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
    // otherwise stick with the initial target
    clicked = $( clicked.parents(options.header)[0] || clicked );
    
    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 = {
            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
        ? 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
            });
        }
    }
});
// deprecated, use accordion("activate", index) instead
$.fn.activate = function(index) {
    return this.accordion("activate", index);
};
})(jQuery);