(function($) {

Drupal.admin = Drupal.admin || {};
Drupal.admin.behaviors = Drupal.admin.behaviors || {};
Drupal.admin.hashes = Drupal.admin.hashes || {};

/**
 * Core behavior for Administration menu.
 *
 * Test whether there is an administration menu is in the output and execute all
 * registered behaviors.
 */
Drupal.behaviors.adminMenu = {
  attach: function (context, settings) {
    // Initialize settings.
    settings.admin_menu = $.extend({
      suppress: false,
      margin_top: false,
      position_fixed: false,
      tweak_modules: false,
      tweak_permissions: false,
      tweak_tabs: false,
      destination: '',
      basePath: settings.basePath,
      hash: 0,
      replacements: {}
    }, settings.admin_menu || {});
    // Check whether administration menu should be suppressed.
    if (settings.admin_menu.suppress) {
      return;
    }
    var $adminMenu = $('#admin-menu:not(.admin-menu-processed)', context);
    // Client-side caching; if administration menu is not in the output, it is
    // fetched from the server and cached in the browser.
    if (!$adminMenu.length && settings.admin_menu.hash) {
      Drupal.admin.getCache(settings.admin_menu.hash, function (response) {
          if (typeof response == 'string' && response.length > 0) {
            $('body', context).prepend(response);
          }
          var $adminMenu = $('#admin-menu:not(.admin-menu-processed)', context);
          // Apply our behaviors.
          Drupal.admin.attachBehaviors(context, settings, $adminMenu);
      });
    }
    // If the menu is in the output already, this means there is a new version.
    else {
      // Apply our behaviors.
      Drupal.admin.attachBehaviors(context, settings, $adminMenu);
    }
  }
};

/**
 * Collapse fieldsets on Modules page.
 */
Drupal.behaviors.adminMenuCollapseModules = {
  attach: function (context, settings) {
    if (settings.admin_menu.tweak_modules) {
      $('#system-modules fieldset:not(.collapsed)', context).addClass('collapsed');
    }
  }
};

/**
 * Collapse modules on Permissions page.
 */
Drupal.behaviors.adminMenuCollapsePermissions = {
  attach: function (context, settings) {
    if (settings.admin_menu.tweak_permissions) {
      // Freeze width of first column to prevent jumping.
      $('#permissions th:first', context).css({ width: $('#permissions th:first', context).width() });
      // Attach click handler.
      $('#permissions tr:has(td.module)', context).once('admin-menu-tweak-permissions', function () {
        var $module = $(this);
        $module.bind('click.admin-menu', function () {
          // @todo Replace with .nextUntil() in jQuery 1.4.
          $module.nextAll().each(function () {
            var $row = $(this);
            if ($row.is(':has(td.module)')) {
              return false;
            }
            $row.toggleClass('element-hidden');
          });
        });
      }).trigger('click.admin-menu');
    }
  }
};

/**
 * Apply margin to page.
 *
 * Note that directly applying marginTop does not work in IE. To prevent
 * flickering/jumping page content with client-side caching, this is a regular
 * Drupal behavior.
 */
Drupal.behaviors.adminMenuMarginTop = {
  attach: function (context, settings) {
    if (!settings.admin_menu.suppress && settings.admin_menu.margin_top) {
      $('body:not(.admin-menu)', context).addClass('admin-menu');
    }
  }
};

/**
 * Retrieve content from client-side cache.
 *
 * @param hash
 *   The md5 hash of the content to retrieve.
 * @param onSuccess
 *   A callback function invoked when the cache request was successful.
 */
Drupal.admin.getCache = function (hash, onSuccess) {
  if (Drupal.admin.hashes.hash !== undefined) {
    return Drupal.admin.hashes.hash;
  }
  $.ajax({
    cache: true,
    type: 'GET',
    dataType: 'text', // Prevent auto-evaluation of response.
    global: false, // Do not trigger global AJAX events.
    url: Drupal.settings.admin_menu.basePath.replace(/admin_menu/, 'js/admin_menu/cache/' + hash),
    success: onSuccess,
    complete: function (XMLHttpRequest, status) {
      Drupal.admin.hashes.hash = status;
    }
  });
};

/**
 * @defgroup admin_behaviors Administration behaviors.
 * @{
 */

/**
 * Attach administrative behaviors.
 */
Drupal.admin.attachBehaviors = function (context, settings, $adminMenu) {
  if ($adminMenu.length) {
    $adminMenu.addClass('admin-menu-processed');
    $.each(Drupal.admin.behaviors, function() {
      this(context, settings, $adminMenu);
    });
  }
};

/**
 * Apply 'position: fixed'.
 */
Drupal.admin.behaviors.positionFixed = function (context, settings, $adminMenu) {
  if (settings.admin_menu.position_fixed) {
    $adminMenu.addClass('admin-menu-position-fixed');
    $adminMenu.css('position', 'fixed');
  }
};

/**
 * Move page tabs into administration menu.
 */
Drupal.admin.behaviors.pageTabs = function (context, settings, $adminMenu) {
  if (settings.admin_menu.tweak_tabs) {
    $('ul.tabs.primary li', context).addClass('admin-menu-tab').appendTo('#admin-menu-wrapper > ul');
    $('ul.tabs.secondary', context).appendTo('#admin-menu-wrapper > ul > li.admin-menu-tab.active').removeClass('secondary');
    $('ul.tabs.primary', context).remove();
  }
};

/**
 * Perform dynamic replacements in cached menu.
 */
Drupal.admin.behaviors.replacements = function (context, settings, $adminMenu) {
  for (var item in settings.admin_menu.replacements) {
    $(item, $adminMenu).html(settings.admin_menu.replacements[item]);
  }
};

/**
 * Inject destination query strings for current page.
 */
Drupal.admin.behaviors.destination = function (context, settings, $adminMenu) {
  if (settings.admin_menu.destination) {
    $('a.admin-menu-destination', $adminMenu).each(function() {
      this.search += (!this.search.length ? '?' : '&') + Drupal.settings.admin_menu.destination;
    });
  }
};

/**
 * Apply JavaScript-based hovering behaviors.
 *
 * @todo This has to run last.  If another script registers additional behaviors
 *   it will not run last.
 */
Drupal.admin.behaviors.hover = function (context, settings, $adminMenu) {
  // Hover emulation for IE 6.
  if ($.browser.msie && parseInt(jQuery.browser.version) == 6) {
    $('li', $adminMenu).hover(
      function () {
        $(this).addClass('iehover');
      },
      function () {
        $(this).removeClass('iehover');
      }
    );
  }

  // Delayed mouseout.
  $('li.expandable', $adminMenu).hover(
    function () {
      // Stop the timer.
      clearTimeout(this.sfTimer);
      // Display child lists.
      $('> ul', this)
        .css({left: 'auto', display: 'block'})
        // Immediately hide nephew lists.
        .parent().siblings('li').children('ul').css({left: '-999em', display: 'none'});
    },
    function () {
      // Start the timer.
      var uls = $('> ul', this);
      this.sfTimer = setTimeout(function () {
        uls.css({left: '-999em', display: 'none'});
      }, 400);
    }
  );
};

/**
 * @} End of "defgroup admin_behaviors".
 */

})(jQuery);