(function($) {

Drupal.behaviors.moduleFilter = {
  attach: function(context) {
    $('.module-filter-inputs-wrapper', context).once('module-filter', function() {
      var filterInput = $('input[name="module_filter[name]"]', context);
      var selector = '#system-modules table tbody tr';
      if (Drupal.settings.moduleFilter.tabs) {
        selector += '.module';
      }

      filterInput.moduleFilter(selector, {
        wrapper: $('#module-filter-modules'),
        delay: 500,
        striping: true,
        childSelector: 'td:nth(1)',
        rules: [
          function(moduleFilter, item) {
            if (!item.unavailable) {
              if (moduleFilter.options.showEnabled) {
                if (item.status && !item.disabled) {
                  return true;
                }
              }
              if (moduleFilter.options.showDisabled) {
                if (!item.status && !item.disabled) {
                  return true;
                }
              }
              if (moduleFilter.options.showRequired) {
                if (item.status && item.disabled) {
                  return true;
                }
              }
            }
            if (moduleFilter.options.showUnavailable) {
              if (item.unavailable || (!item.status && item.disabled)) {
                return true;
              }
            }
            return false;
          }
        ],
        buildIndex: [
          function(moduleFilter, item) {
            var $checkbox = $('td.checkbox :checkbox', item.element);
            if ($checkbox.size() > 0) {
              item.status = $checkbox.is(':checked');
              item.disabled = $checkbox.is(':disabled');
            }
            else {
              item.status = false;
              item.disabled = true;
              item.unavailable = true;
            }
            return item;
          }
        ],
        showEnabled: $('#edit-module-filter-show-enabled').is(':checked'),
        showDisabled: $('#edit-module-filter-show-disabled').is(':checked'),
        showRequired: $('#edit-module-filter-show-required').is(':checked'),
        showUnavailable: $('#edit-module-filter-show-unavailable').is(':checked')
      });

      var moduleFilter = filterInput.data('moduleFilter');

      moduleFilter.operators = {
        description: function(string, moduleFilter, item) {
          if (item.description == undefined) {
            var description = $('.description', item.element).clone();
            $('.admin-requirements', description).remove();
            $('.admin-operations', description).remove();
            item.description = description.text().toLowerCase();
          }

          if (item.description.indexOf(string) >= 0) {
            return true;
          }
        },
        requiredBy: function(string, moduleFilter, item) {
          if (item.requiredBy == undefined) {
            var requirements = Drupal.ModuleFilter.getRequirements(item.element);
            item.requires = requirements.requires;
            item.requiredBy = requirements.requiredBy;
          }

          for (var i in item.requiredBy) {
            if (item.requiredBy[i].indexOf(string) >= 0) {
              return true;
            }
          }
        },
        requires: function(string, moduleFilter, item) {
          if (item.requires == undefined) {
            var requirements = Drupal.ModuleFilter.getRequirements(item.element);
            item.requires = requirements.requires;
            item.requiredBy = requirements.requiredBy;
          }

          for (var i in item.requires) {
            if (item.requires[i].indexOf(string) >= 0) {
              return true;
            }
          }
        }
      };

      $('#edit-module-filter-show-enabled', context).change(function() {
        moduleFilter.options.showEnabled = $(this).is(':checked');
        moduleFilter.applyFilter();
      });
      $('#edit-module-filter-show-disabled', context).change(function() {
        moduleFilter.options.showDisabled = $(this).is(':checked');
        moduleFilter.applyFilter();
      });
      $('#edit-module-filter-show-required', context).change(function() {
        moduleFilter.options.showRequired = $(this).is(':checked');
        moduleFilter.applyFilter();
      });
      $('#edit-module-filter-show-unavailable', context).change(function() {
        moduleFilter.options.showUnavailable = $(this).is(':checked');
        moduleFilter.applyFilter();
      });

      if (!Drupal.settings.moduleFilter.tabs) {
        moduleFilter.element.bind('moduleFilter:start', function() {
          $('#system-modules fieldset').show();
        });

        moduleFilter.element.bind('moduleFilter:finish', function(e, data) {
          $('#system-modules fieldset').each(function(i) {
            $fieldset = $(this);
            if ($('tbody tr', $fieldset).filter(':visible').length == 0) {
              $fieldset.hide();
            }
          });
        });

        moduleFilter.applyFilter();
      }
    });
  }
};

Drupal.ModuleFilter.getRequirements = function(element) {
  var requires = new Array();
  var requiredBy = new Array();
  $('.admin-requirements', element).each(function() {
    var text = $(this).text();
    if (text.substr(0, 9) == 'Requires:') {
      // Requires element.
      requiresString = text.substr(9);
      requires = requiresString.replace(/\([a-z]*\)/g, '').split(',');
    }
    else if (text.substr(0, 12) == 'Required by:') {
      // Required by element.
      requiredByString = text.substr(12);
      requiredBy = requiredByString.replace(/\([a-z]*\)/g, '').split(',');
    }
  });
  for (var i in requires) {
    requires[i] = $.trim(requires[i].toLowerCase());
  }
  for (var i in requiredBy) {
    requiredBy[i] = $.trim(requiredBy[i].toLowerCase());
  }
  return { requires: requires, requiredBy: requiredBy };
};

})(jQuery);
