(function ($) {
  function teaser_handler(event) {
    if ($("input[name=faq_display]:checked").val() != "new_page") {
      if ($("input[name=faq_use_teaser]:checked").val() == 1) {
        $("input[name=faq_more_link]").removeAttr("disabled");
      }
      else {
        $("input[name=faq_more_link]").attr("disabled", "disabled");
      }
    }
  }

  function faq_display_handler(event) {
    // Enable / disable "questions_inline" and "questions_top" only settings.
    if ($("input[name=faq_display]:checked").val() == "questions_inline" || $("input[name=faq_display]:checked").val() == "questions_top") {
      $("input[name=faq_back_to_top]").removeAttr("disabled");
      $("input[name=faq_qa_mark]").removeAttr("disabled");
      // Enable / disable label settings according to "qa_mark" setting.
      if ($("input[name=faq_qa_mark]:checked").val() == 1) {
        $("input[name=faq_question_label]").removeAttr("disabled");
        $("input[name=faq_answer_label]").removeAttr("disabled");
      }
      else {
        $("input[name=faq_question_label]").attr("disabled", "disabled");
        $("input[name=faq_answer_label]").attr("disabled", "disabled");
      }
    }
    else {
      $("input[name=faq_back_to_top]").attr("disabled", "disabled");
      $("input[name=faq_qa_mark]").attr("disabled", "disabled");
      $("input[name=faq_question_label]").attr("disabled", "disabled");
      $("input[name=faq_answer_label]").attr("disabled", "disabled");
    }

    // Enable / disable "hide_answer" only settings.
    if ($("input[name=faq_display]:checked").val() != "hide_answer") {
      $("input[name=faq_hide_qa_accordion]").attr("disabled", "disabled");
    }
    else {
      $("input[name=faq_hide_qa_accordion]").removeAttr("disabled");
    }

    // Enable / disable "new_page" only settings.
    if ($("input[name=faq_display]:checked").val() != "new_page") {
      $("input[name=faq_use_teaser]").removeAttr("disabled");
      $("input[name=faq_more_link]").removeAttr("disabled");
      $("input[name=faq_disable_node_links]").removeAttr("disabled");
    }
    else {
      $("input[name=faq_use_teaser]").attr("disabled", "disabled");
      $("input[name=faq_more_link]").attr("disabled", "disabled");
      $("input[name=faq_disable_node_links]").attr("disabled", "disabled");
    }
    teaser_handler(event);

    // Enable / disable "new_page" and "questions_top" only settings.
    if ($("input[name=faq_display]:checked").val() == "new_page" ||
      $("input[name=faq_display]:checked").val() == "questions_top") {
      $("select[name=faq_question_listing]").removeAttr("disabled");
    }
    else {
      $("select[name=faq_question_listing]").attr("disabled", "disabled");
    }

  }

  function qa_mark_handler(event) {
    if ($("input[name=faq_display]:checked").val() == "questions_inline") {
      // Enable / disable label settings according to "qa_mark" setting.
      if ($("input[name=faq_qa_mark]:checked").val() == 1) {
        $("input[name=faq_question_label]").removeAttr("disabled");
        $("input[name=faq_answer_label]").removeAttr("disabled");
      }
      else {
        $("input[name=faq_question_label]").attr("disabled", "disabled");
        $("input[name=faq_answer_label]").attr("disabled", "disabled");
      }
    }
  }

  function questions_top_handler(event) {
    $("input[name=faq_display]").val() == "questions_top" ?
      $("input[name=faq_group_questions_top]").removeAttr("disabled"):
      $("input[name=faq_group_questions_top]").attr("disabled", "disabled");

    $("input[name=faq_display]").val() == "questions_top" ?
      $("input[name=faq_answer_category_name]").removeAttr("disabled"):
      $("input[name=faq_answer_category_name]").attr("disabled", "disabled");
  }


  function child_term_handler(event) {
    if ($("input[name=faq_hide_child_terms]:checked").val() == 1) {
      $("input[name=faq_show_term_page_children]").attr("disabled", "disabled");
    }
    else if ($("input[name=faq_category_display]:checked").val() != "categories_inline") {
      $("input[name=faq_show_term_page_children]").removeAttr("disabled");
    }
  }


  function categories_handler(event) {
    if ($("input[name=faq_display]").val() == "questions_top") {
      $("input[name=faq_category_display]:checked").val() == "categories_inline" ?
        $("input[name=faq_group_questions_top]").removeAttr("disabled"):
        $("input[name=faq_group_questions_top]").attr("disabled", "disabled");
      $("input[name=faq_category_display]:checked").val() == "new_page" ?
        $("input[name=faq_answer_category_name]").attr("disabled", "disabled"):
        $("input[name=faq_answer_category_name]").removeAttr("disabled");
    }
    else {
      $("input[name=faq_group_questions_top]").attr("disabled", "disabled");
    }

    // Enable / disable "hide_qa" only settings.
    if ($("input[name=faq_category_display]:checked").val() != "hide_qa") {
      $("input[name=faq_category_hide_qa_accordion]").attr("disabled", "disabled");
    }
    else {
      $("input[name=faq_category_hide_qa_accordion]").removeAttr("disabled");
    }

    $("input[name=faq_category_display]:checked").val() == "categories_inline" ?
      $("input[name=faq_hide_child_terms]").attr("disabled", "disabled"):
      $("input[name=faq_hide_child_terms]").removeAttr("disabled");
    $("input[name=faq_category_display]:checked").val() == "categories_inline" ?
      $("input[name=faq_show_term_page_children]").attr("disabled", "disabled"):
      $("input[name=faq_show_term_page_children]").removeAttr("disabled");
    $("input[name=faq_category_display]:checked").val() == "new_page" ?
      $("select[name=faq_category_listing]").removeAttr("disabled"):
      $("select[name=faq_category_listing]").attr("disabled", "disabled");

    child_term_handler();
  }

  Drupal.behaviors.initFaqModule = {
    attach: function (context) {
      // Hide/show answer for a question.
      var faq_hide_qa_accordion = Drupal.settings.faq.faq_hide_qa_accordion;
      $('div.faq-dd-hide-answer', context).addClass("collapsible collapsed");

      if (!faq_hide_qa_accordion) {
        $('div.faq-dd-hide-answer:not(.faq-processed)', context).addClass('faq-processed').hide();
      }
      $('div.faq-dt-hide-answer:not(.faq-processed)', context).addClass('faq-processed').click(function() {
        if (faq_hide_qa_accordion) {
          if ($('.faq-qa-visible', context).offset() != undefined) {
            $('html, body', context).animate({
              scrollTop: $('.faq-qa-visible', context).offset().top
            }, 1);
          }
          $('div.faq-dt-hide-answer').not($(this)).removeClass('faq-qa-visible');
        }
        $(this).toggleClass('faq-qa-visible');
        $(this).parent().addClass('faq-viewed');
        $('div.faq-dd-hide-answer').not($(this).next('div.faq-dd-hide-answer')).addClass("collapsed");
        if (!faq_hide_qa_accordion) {
          $(this).next('div.faq-dd-hide-answer').slideToggle('fast', function() {
            $(this).parent().toggleClass('expanded');
          });
        }
        $(this).next('div.faq-dd-hide-answer').toggleClass("collapsed");

        // Change the fragment, too, for permalink/bookmark.
        // To keep the current page from scrolling, refs
        // http://stackoverflow.com/questions/1489624/modifying-document-location-hash-without-page-scrolling/1489802#1489802
        var hash = $(this).find('a').attr('id');
        var fx, node = $('#' + hash);
        if (node.length) {
          fx = $('<div></div>')
            .css({position: 'absolute', visibility: 'hidden', top: $(window).scrollTop() + 'px'})
            .attr('id', hash)
            .appendTo(document.body);
          node.attr('id', '');
        }
        document.location.hash = hash;
        if (node.length) {
          fx.remove();
          node.attr('id', hash);
        }

        return false;
      });

      // Show any question identified by a fragment
      if (/^#\w+$/.test(document.location.hash)) {
        $('div.faq-dt-hide-answer ' + document.location.hash).parents('.faq-dt-hide-answer').triggerHandler('click');
      }

      // Hide/show q/a for a category.
      var faq_category_hide_qa_accordion = Drupal.settings.faq.faq_category_hide_qa_accordion;
      $('div.faq-qa-hide', context).addClass("collapsible collapsed");
      if (!faq_category_hide_qa_accordion) {
        $('div.faq-qa-hide', context).hide();
      }
      $('div.faq-qa-header .faq-header:not(.faq-processed)', context).addClass('faq-processed').click(function() {
        if (faq_category_hide_qa_accordion) {
          if ($('.faq-category-qa-visible', context).offset() != undefined) {
            $('html, body', context).animate({
              scrollTop: $('.faq-category-qa-visible', context).offset().top
            }, 1);
          }
          $('div.faq-qa-header .faq-header').not($(this)).removeClass('faq-category-qa-visible');
        }
        $(this).toggleClass('faq-category-qa-visible');
        $('div.faq-qa-hide').not($(this).parent().next('div.faq-qa-hide')).addClass("collapsed");
        if (!faq_category_hide_qa_accordion) {
          $(this).parent().next('div.faq-qa-hide').slideToggle('fast', function() {
            $(this).parent().toggleClass('expanded');
          });
        }
        $(this).parent().next('div.faq-qa-hide').toggleClass("collapsed");
        return false;
      });


      // Show expand all link.
      if (!faq_hide_qa_accordion && !faq_category_hide_qa_accordion) {
        $('#faq-expand-all', context).show();
        $('#faq-expand-all a.faq-expand-all-link', context).show();

        // Add collapse link click event.
        $('#faq-expand-all a.faq-collapse-all-link:not(.faq-processed)', context).addClass('faq-processed').click(function () {
          $(this).hide();
          $('#faq-expand-all a.faq-expand-all-link').show();
          $('div.faq-qa-hide').slideUp('slow', function() {
            $(this).removeClass('expanded');
          });
          $('div.faq-dd-hide-answer').slideUp('slow', function() {
            $(this).removeClass('expanded');
          });
        });

        // Add expand link click event.
        $('#faq-expand-all a.faq-expand-all-link:not(.faq-processed)', context).addClass('faq-processed').click(function () {
          $(this).hide();
          $('#faq-expand-all a.faq-collapse-all-link').show();
          $('div.faq-qa-hide').slideDown('slow', function() {
            $(this).addClass('expanded');
          });
          $('div.faq-dd-hide-answer').slideDown('slow', function() {
            $(this).addClass('expanded');
          });
        });
      }



      // Handle faq_category_settings_form.
      faq_display_handler();
      questions_top_handler();
      categories_handler();
      teaser_handler();
      $("input[name=faq_display]:not(.faq-processed)", context).addClass('faq-processed').bind("click", faq_display_handler);
      $("input[name=faq_qa_mark]:not(.faq-processed)", context).addClass('faq-processed').bind("click", qa_mark_handler);
      $("input[name=faq_use_teaser]:not(.faq-processed)", context).addClass('faq-processed').bind("click", teaser_handler);
      $("input[name=faq_category_display]:not(.faq-processed)", context).addClass('faq-processed').bind("click", categories_handler);
      $("input[name=faq_hide_child_terms]:not(.faq-processed)", context).addClass('faq-processed').bind("click", child_term_handler);
    }
  }
})(jQuery);