/**
 * @file
 * Some basic behaviors and utility functions for Views.
 */
(function ($) {

  Drupal.Views = {};

  /**
   * JQuery UI tabs, Views integration component.
   */
  Drupal.behaviors.viewsTabs = {
    attach: function (context) {
      if ($.viewsUi && $.viewsUi.tabs) {
        $('#views-tabset').once('views-processed').viewsTabs({
          selectedClass: 'active'
        });
      }

      $('a.views-remove-link').once('views-processed').click(function(event) {
        var id = $(this).attr('id').replace('views-remove-link-', '');
        $('#views-row-' + id).hide();
        $('#views-removed-' + id).get(0).checked = true;
        event.preventDefault();
      });
      // Here is to handle display deletion
      // (checking in the hidden checkbox and hiding out the row).
      $('a.display-remove-link')
        .addClass('display-processed')
        .click(function() {
          var id = $(this).attr('id').replace('display-remove-link-', '');
          $('#display-row-' + id).hide();
          $('#display-removed-' + id).get(0).checked = true;
          return false;
        });
    }
  };

  /**
   * Helper function to parse a querystring.
   */
  Drupal.Views.parseQueryString = function (query) {
    var args = {};
    var pos = query.indexOf('?');
    if (pos != -1) {
      query = query.substring(pos + 1);
    }
    var pairs = query.split('&');
    for (var i in pairs) {
      if (typeof(pairs[i]) == 'string') {
        var pair = pairs[i].split('=');
        // Ignore the 'q' path argument, if present.
        if (pair[0] != 'q' && pair[1]) {
          args[decodeURIComponent(pair[0].replace(/\+/g, ' '))] = decodeURIComponent(pair[1].replace(/\+/g, ' '));
        }
      }
    }
    return args;
  };

  /**
   * Helper function to return a view's arguments based on a path.
   */
  Drupal.Views.parseViewArgs = function (href, viewPath) {
    // Provide language prefix.
    if (Drupal.settings.pathPrefix) {
      var viewPath = Drupal.settings.pathPrefix + viewPath;
    }
    var returnObj = {};
    var path = Drupal.Views.getPath(href);
    // Ensure there is a correct path.
    if (viewPath && path.substring(0, viewPath.length + 1) == viewPath + '/') {
      var args = decodeURIComponent(path.substring(viewPath.length + 1, path.length));
      returnObj.view_args = args;
      returnObj.view_path = path;
    }
    return returnObj;
  };

  /**
   * Strip off the protocol plus domain from an href.
   */
  Drupal.Views.pathPortion = function (href) {
    // Remove e.g. http://example.com if present.
    var protocol = window.location.protocol;
    if (href.substring(0, protocol.length) == protocol) {
      // 2 is the length of the '//' that normally follows the protocol.
      href = href.substring(href.indexOf('/', protocol.length + 2));
    }
    return href;
  };

  /**
   * Return the Drupal path portion of an href.
   */
  Drupal.Views.getPath = function (href) {
    href = Drupal.Views.pathPortion(href);
    href = href.substring(Drupal.settings.basePath.length, href.length);
    // 3 is the length of the '?q=' added to the URL without clean URLs.
    if (href.substring(0, 3) == '?q=') {
      href = href.substring(3, href.length);
    }
    var chars = ['#', '?', '&'];
    for (var i in chars) {
      if (href.indexOf(chars[i]) > -1) {
        href = href.substr(0, href.indexOf(chars[i]));
      }
    }
    return href;
  };

})(jQuery);
