/*
 * jQuery UI Tabs
 *
 * Copyright (c) 2007, 2008 Klaus Hartl (stilbuero.de)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * http://docs.jquery.com/UI/Tabs
 *
 * Depends:
 *  ui.core.js
 *
 * Revision: $Id: ui.tabs.js,v 1.2 2008-08-28 14:22:08 mdeumlich Exp $
 */
;(function($) {
  
  $.widget("ui.tabs", {
    init: function() {
      this.options.event += '.tabs'; // namespace event
      
      // create tabs
      this.tabify(true);
    },
    setData: function(key, value) {
      if ((/^selected/).test(key))
        this.select(value);
      else {
        this.options[key] = value;
        this.tabify();
      }
    },
    length: function() {
      return this.$tabs.length;
    },
    tabId: function(a) {
      return a.title && a.title.replace(/\s/g, '_').replace(/[^A-Za-z0-9\-_:\.]/g, '')
        || this.options.idPrefix + $.data(a);
    },
    ui: function(tab, panel) {
      return {
        instance: this,
        options: this.options,
        tab: tab,
        panel: panel
      };
    },
    tabify: function(init) {

      this.$lis = $('li:has(a[href])', this.element);
      this.$tabs = this.$lis.map(function() { return $('a', this)[0]; });
      this.$panels = $([]);

      var self = this, o = this.options;

      this.$tabs.each(function(i, a) {
        // inline tab
        if (a.hash && a.hash.replace('#', '')) // Safari 2 reports '#' for an empty hash
          self.$panels = self.$panels.add(a.hash);
        // remote tab
        else if ($(a).attr('href') != '#') { // prevent loading the page itself if href is just "#"
          $.data(a, 'href.tabs', a.href); // required for restore on destroy
          $.data(a, 'load.tabs', a.href); // mutable
          var id = self.tabId(a);
          a.href = '#' + id;
          var $panel = $('#' + id);
          if (!$panel.length) {
            $panel = $(o.panelTemplate).attr('id', id).addClass(o.panelClass)
              .insertAfter( self.$panels[i - 1] || self.element );
            $panel.data('destroy.tabs', true);
          }
          self.$panels = self.$panels.add( $panel );
        }
        // invalid tab href
        else
          o.disabled.push(i + 1);
      });

      if (init) {

        // attach necessary classes for styling if not present
        this.element.hasClass(o.navClass) || this.element.addClass(o.navClass);
        this.$panels.each(function() {
          var $this = $(this);
          $this.hasClass(o.panelClass) || $this.addClass(o.panelClass);
        });

        // Selected tab
        // use "selected" option or try to retrieve:
        // 1. from fragment identifier in url
        // 2. from cookie
        // 3. from selected class attribute on <li>
        if (o.selected === undefined) {
          if (location.hash) {
            this.$tabs.each(function(i, a) {
              if (a.hash == location.hash) {
                o.selected = i;
                // prevent page scroll to fragment
                if ($.browser.msie || $.browser.opera) { // && !o.remote
                  var $toShow = $(location.hash), toShowId = $toShow.attr('id');
                  $toShow.attr('id', '');
                  setTimeout(function() {
                    $toShow.attr('id', toShowId); // restore id
                  }, 500);
                }
                scrollTo(0, 0);
                return false; // break
              }
            });
          }
          else if (o.cookie) {
            var index = parseInt($.cookie('ui-tabs' + $.data(self.element)),10);
            if (index && self.$tabs[index])
              o.selected = index;
          }
          else if (self.$lis.filter('.' + o.selectedClass).length)
            o.selected = self.$lis.index( self.$lis.filter('.' + o.selectedClass)[0] );
        }
        o.selected = o.selected === null || o.selected !== undefined ? o.selected : 0; // first tab selected by default

        // Take disabling tabs via class attribute from HTML
        // into account and update option properly.
        // A selected tab cannot become disabled.
        o.disabled = $.unique(o.disabled.concat(
          $.map(this.$lis.filter('.' + o.disabledClass),
            function(n, i) { return self.$lis.index(n); } )
        )).sort();
        if ($.inArray(o.selected, o.disabled) != -1)
          o.disabled.splice($.inArray(o.selected, o.disabled), 1);
        
        // highlight selected tab
        this.$panels.addClass(o.hideClass);
        this.$lis.removeClass(o.selectedClass);
        if (o.selected !== null) {
          this.$panels.eq(o.selected).show().removeClass(o.hideClass); // use show and remove class to show in any case no matter how it has been hidden before
          this.$lis.eq(o.selected).addClass(o.selectedClass);
          
          // seems to be expected behavior that the show callback is fired
          var onShow = function() {
            $(self.element).triggerHandler('tabsshow',
              [self.ui(self.$tabs[o.selected], self.$panels[o.selected])], o.show);
          }; 

          // load if remote tab
          if ($.data(this.$tabs[o.selected], 'load.tabs'))
            this.load(o.selected, onShow);
          // just trigger show event
          else
            onShow();
          
        }
        
        // clean up to avoid memory leaks in certain versions of IE 6
        $(window).bind('unload', function() {
          self.$tabs.unbind('.tabs');
          self.$lis = self.$tabs = self.$panels = null;
        });

      }

      // disable tabs
      for (var i = 0, li; li = this.$lis[i]; i++)
        $(li)[$.inArray(i, o.disabled) != -1 && !$(li).hasClass(o.selectedClass) ? 'addClass' : 'removeClass'](o.disabledClass);

      // reset cache if switching from cached to not cached
      if (o.cache === false)
        this.$tabs.removeData('cache.tabs');
      
      // set up animations
      var hideFx, showFx, baseFx = { 'min-width': 0, duration: 1 }, baseDuration = 'normal';
      if (o.fx && o.fx.constructor == Array)
        hideFx = o.fx[0] || baseFx, showFx = o.fx[1] || baseFx;
      else
        hideFx = showFx = o.fx || baseFx;

      // reset some styles to maintain print style sheets etc.
      var resetCSS = { display: '', overflow: '', height: '' };
      if (!$.browser.msie) // not in IE to prevent ClearType font issue
        resetCSS.opacity = '';

      // Hide a tab, animation prevents browser scrolling to fragment,
      // $show is optional.
      function hideTab(clicked, $hide, $show) {
        $hide.animate(hideFx, hideFx.duration || baseDuration, function() { //
          $hide.addClass(o.hideClass).css(resetCSS); // maintain flexible height and accessibility in print etc.
          if ($.browser.msie && hideFx.opacity)
            $hide[0].style.filter = '';
          if ($show)
            showTab(clicked, $show, $hide);
        });
      }

      // Show a tab, animation prevents browser scrolling to fragment,
      // $hide is optional.
      function showTab(clicked, $show, $hide) {
        if (showFx === baseFx)
          $show.css('display', 'block'); // prevent occasionally occuring flicker in Firefox cause by gap between showing and hiding the tab panels
        $show.animate(showFx, showFx.duration || baseDuration, function() {
          $show.removeClass(o.hideClass).css(resetCSS); // maintain flexible height and accessibility in print etc.
          if ($.browser.msie && showFx.opacity)
            $show[0].style.filter = '';

          // callback
          $(self.element).triggerHandler('tabsshow',
            [self.ui(clicked, $show[0])], o.show);

        });
      }

      // switch a tab
      function switchTab(clicked, $li, $hide, $show) {
        /*if (o.bookmarkable && trueClick) { // add to history only if true click occured, not a triggered click
          $.ajaxHistory.update(clicked.hash);
        }*/
        $li.addClass(o.selectedClass)
          .siblings().removeClass(o.selectedClass);
        hideTab(clicked, $hide, $show);
      }

      // attach tab event handler, unbind to avoid duplicates from former tabifying...
      this.$tabs.unbind('.tabs').bind(o.event, function() {

        //var trueClick = e.clientX; // add to history only if true click occured, not a triggered click
        var $li = $(this).parents('li:eq(0)'),
          $hide = self.$panels.filter(':visible'),
          $show = $(this.hash);

        // If tab is already selected and not unselectable or tab disabled or 
        // or is already loading or click callback returns false stop here.
        // Check if click handler returns false last so that it is not executed
        // for a disabled or loading tab!
        if (($li.hasClass(o.selectedClass) && !o.unselect)
          || $li.hasClass(o.disabledClass) 
          || $(this).hasClass(o.loadingClass)
          || $(self.element).triggerHandler('tabsselect', [self.ui(this, $show[0])], o.select) === false
          ) {
          this.blur();
          return false;
        }

        self.options.selected = self.$tabs.index(this);

        // if tab may be closed
        if (o.unselect) {
          if ($li.hasClass(o.selectedClass)) {
            self.options.selected = null;
            $li.removeClass(o.selectedClass);
            self.$panels.stop();
            hideTab(this, $hide);
            this.blur();
            return false;
          } else if (!$hide.length) {
            self.$panels.stop();
            var a = this;
            self.load(self.$tabs.index(this), function() {
              $li.addClass(o.selectedClass).addClass(o.unselectClass);
              showTab(a, $show);
            });
            this.blur();
            return false;
          }
        }

        if (o.cookie)
          $.cookie('ui-tabs' + $.data(self.element), self.options.selected, o.cookie);

        // stop possibly running animations
        self.$panels.stop();

        // show new tab
        if ($show.length) {

          // prevent scrollbar scrolling to 0 and than back in IE7, happens only if bookmarking/history is enabled
          /*if ($.browser.msie && o.bookmarkable) {
            var showId = this.hash.replace('#', '');
            $show.attr('id', '');
            setTimeout(function() {
              $show.attr('id', showId); // restore id
            }, 0);
          }*/

          var a = this;
          self.load(self.$tabs.index(this), $hide.length ? 
            function() {
              switchTab(a, $li, $hide, $show);
            } :
            function() {
              $li.addClass(o.selectedClass);
              showTab(a, $show);
            }
          );

          // Set scrollbar to saved position - need to use timeout with 0 to prevent browser scroll to target of hash
          /*var scrollX = window.pageXOffset || document.documentElement && document.documentElement.scrollLeft || document.body.scrollLeft || 0;
          var scrollY = window.pageYOffset || document.documentElement && document.documentElement.scrollTop || document.body.scrollTop || 0;
          setTimeout(function() {
            scrollTo(scrollX, scrollY);
          }, 0);*/

        } else
          throw 'jQuery UI Tabs: Mismatching fragment identifier.';

        // Prevent IE from keeping other link focussed when using the back button
        // and remove dotted border from clicked link. This is controlled in modern
        // browsers via CSS, also blur removes focus from address bar in Firefox
        // which can become a usability and annoying problem with tabsRotate.
        if ($.browser.msie)
          this.blur();

        //return o.bookmarkable && !!trueClick; // convert trueClick == undefined to Boolean required in IE
        return false;

      });

      // disable click if event is configured to something else
      if (!(/^click/).test(o.event))
        this.$tabs.bind('click.tabs', function() { return false; });

    },
    add: function(url, label, index) {
      if (index == undefined) 
        index = this.$tabs.length; // append by default

      var o = this.options;
      var $li = $(o.tabTemplate.replace(/#\{href\}/, url).replace(/#\{label\}/, label));
      $li.data('destroy.tabs', true);

      var id = url.indexOf('#') == 0 ? url.replace('#', '') : this.tabId( $('a:first-child', $li)[0] );

      // try to find an existing element before creating a new one
      var $panel = $('#' + id);
      if (!$panel.length) {
        $panel = $(o.panelTemplate).attr('id', id)
          .addClass(o.panelClass).addClass(o.hideClass);
        $panel.data('destroy.tabs', true);
      }
      if (index >= this.$lis.length) {
        $li.appendTo(this.element);
        $panel.appendTo(this.element[0].parentNode);
      } else {
        $li.insertBefore(this.$lis[index]);
        $panel.insertBefore(this.$panels[index]);
      }
      
      o.disabled = $.map(o.disabled,
        function(n, i) { return n >= index ? ++n : n });
        
      this.tabify();

      if (this.$tabs.length == 1) {
        $li.addClass(o.selectedClass);
        $panel.removeClass(o.hideClass);
        var href = $.data(this.$tabs[0], 'load.tabs');
        if (href)
          this.load(index, href);
      }

      // callback
      this.element.triggerHandler('tabsadd',
        [this.ui(this.$tabs[index], this.$panels[index])], o.add
      );
    },
    remove: function(index) {
      var o = this.options, $li = this.$lis.eq(index).remove(),
        $panel = this.$panels.eq(index).remove();

      // If selected tab was removed focus tab to the right or
      // in case the last tab was removed the tab to the left.
      if ($li.hasClass(o.selectedClass) && this.$tabs.length > 1)
        this.select(index + (index + 1 < this.$tabs.length ? 1 : -1));

      o.disabled = $.map($.grep(o.disabled, function(n, i) { return n != index; }),
        function(n, i) { return n >= index ? --n : n });

      this.tabify();

      // callback
      this.element.triggerHandler('tabsremove',
        [this.ui($li.find('a')[0], $panel[0])], o.remove
      );
    },
    enable: function(index) {
      var o = this.options;
      if ($.inArray(index, o.disabled) == -1)
        return;
        
      var $li = this.$lis.eq(index).removeClass(o.disabledClass);
      if ($.browser.safari) { // fix disappearing tab (that used opacity indicating disabling) after enabling in Safari 2...
        $li.css('display', 'inline-block');
        setTimeout(function() {
          $li.css('display', 'block');
        }, 0);
      }

      o.disabled = $.grep(o.disabled, function(n, i) { return n != index; });

      // callback
      this.element.triggerHandler('tabsenable',
        [this.ui(this.$tabs[index], this.$panels[index])], o.enable
      );

    },
    disable: function(index) {
      var self = this, o = this.options;
      if (index != o.selected) { // cannot disable already selected tab
        this.$lis.eq(index).addClass(o.disabledClass);

        o.disabled.push(index);
        o.disabled.sort();

        // callback
        this.element.triggerHandler('tabsdisable',
          [this.ui(this.$tabs[index], this.$panels[index])], o.disable
        );
      }
    },
    select: function(index) {
      if (typeof index == 'string')
        index = this.$tabs.index( this.$tabs.filter('[href$=' + index + ']')[0] );
      this.$tabs.eq(index).trigger(this.options.event);
    },
    load: function(index, callback) { // callback is for internal usage only
      
      var self = this, o = this.options, $a = this.$tabs.eq(index), a = $a[0],
          bypassCache = callback == undefined || callback === false, url = $a.data('load.tabs');

      callback = callback || function() {};
      
      // no remote or from cache - just finish with callback
      if (!url || !bypassCache && $.data(a, 'cache.tabs')) {
        callback();
        return;
      }

      // load remote from here on
      
      var inner = function(parent) {
        var $parent = $(parent), $inner = $parent.find('*:last');
        return $inner.length && $inner || $parent;
      };
      var cleanup = function() {
        self.$tabs.filter('.' + o.loadingClass).removeClass(o.loadingClass)
              .each(function() {
                if (o.spinner)
                  inner(this).parent().html(inner(this).data('label.tabs'));
              });
        self.xhr = null;
      };
      
      if (o.spinner) {
        var label = inner(a).html();
        inner(a).wrapInner('<em></em>')
          .find('em').data('label.tabs', label).html(o.spinner);
      }

      var ajaxOptions = $.extend({}, o.ajaxOptions, {
        url: url,
        success: function(r, s) {
          $(a.hash).html(r);
          cleanup();
          
          if (o.cache)
            $.data(a, 'cache.tabs', true); // if loaded once do not load them again

          // callbacks
          $(self.element).triggerHandler('tabsload',
            [self.ui(self.$tabs[index], self.$panels[index])], o.load
          );
          o.ajaxOptions.success && o.ajaxOptions.success(r, s);
          
          // This callback is required because the switch has to take
          // place after loading has completed. Call last in order to 
          // fire load before show callback...
          callback();
        }
      });
      if (this.xhr) {
        // terminate pending requests from other tabs and restore tab label
        this.xhr.abort();
        cleanup();
      }
      $a.addClass(o.loadingClass);
      setTimeout(function() { // timeout is again required in IE, "wait" for id being restored
        self.xhr = $.ajax(ajaxOptions);
      }, 0);

    },
    url: function(index, url) {
      this.$tabs.eq(index).removeData('cache.tabs').data('load.tabs', url);
    },
    destroy: function() {
      var o = this.options;
      this.element.unbind('.tabs')
        .removeClass(o.navClass).removeData('tabs');
      this.$tabs.each(function() {
        var href = $.data(this, 'href.tabs');
        if (href)
          this.href = href;
        var $this = $(this).unbind('.tabs');
        $.each(['href', 'load', 'cache'], function(i, prefix) {
          $this.removeData(prefix + '.tabs');
        });
      });
      this.$lis.add(this.$panels).each(function() {
        if ($.data(this, 'destroy.tabs'))
          $(this).remove();
        else
          $(this).removeClass([o.selectedClass, o.unselectClass,
            o.disabledClass, o.panelClass, o.hideClass].join(' '));
      });
    }
  });
  
  $.ui.tabs.defaults = {
    // basic setup
    unselect: false,
    event: 'click',
    disabled: [],
    cookie: null, // e.g. { expires: 7, path: '/', domain: 'jquery.com', secure: true }
    // TODO history: false,

    // Ajax
    spinner: 'Loading&#8230;',
    cache: false,
    idPrefix: 'ui-tabs-',
    ajaxOptions: {},

    // animations
    fx: null, // e.g. { height: 'toggle', opacity: 'toggle', duration: 200 }

    // templates
    tabTemplate: '<li><a href="#{href}"><span>#{label}</span></a></li>',
    panelTemplate: '<div></div>',

    // CSS classes
    navClass: 'ui-tabs-nav',
    selectedClass: 'ui-tabs-selected',
    unselectClass: 'ui-tabs-unselect',
    disabledClass: 'ui-tabs-disabled',
    panelClass: 'ui-tabs-panel',
    hideClass: 'ui-tabs-hide',
    loadingClass: 'ui-tabs-loading'
  };
  
  $.ui.tabs.getter = "length";

/*
 * Tabs Extensions
 */

  /*
   * Rotate
   */
  $.extend($.ui.tabs.prototype, {
    rotation: null,
    rotate: function(ms, continuing) {
      
      continuing = continuing || false;
      
      var self = this, t = this.options.selected;
      
      function start() {
        self.rotation = setInterval(function() {
          t = ++t < self.$tabs.length ? t : 0;
          self.select(t);
        }, ms); 
      }
      
      function stop(e) {
        if (!e || e.clientX) { // only in case of a true click
          clearInterval(self.rotation);
        }
      }
      
      // start interval
      if (ms) {
        start();
        if (!continuing)
          this.$tabs.bind(this.options.event, stop);
        else
          this.$tabs.bind(this.options.event, function() {
            stop();
            t = self.options.selected;
            start();
          });
      }
      // stop interval
      else {
        stop();
        this.$tabs.unbind(this.options.event, stop);
      }
    }
  });

})(jQuery);