(function($) {

Drupal.wysiwyg.editor.init.ckeditor = function(settings) {
  // Plugins must only be loaded once. Only the settings from the first format
  // will be used but they're identical anyway.
  var registeredPlugins = {};
  for (var format in settings) {
    if (Drupal.settings.wysiwyg.plugins[format]) {
      // Register native external plugins.
      // Array syntax required; 'native' is a predefined token in JavaScript.
      for (var pluginName in Drupal.settings.wysiwyg.plugins[format]['native']) {
        if (!registeredPlugins[pluginName]) {
          var plugin = Drupal.settings.wysiwyg.plugins[format]['native'][pluginName];
          CKEDITOR.plugins.addExternal(pluginName, plugin.path, plugin.fileName);
          registeredPlugins[pluginName] = true;
        }
      }
      // Register Drupal plugins.
      for (var pluginName in Drupal.settings.wysiwyg.plugins[format].drupal) {
        if (!registeredPlugins[pluginName]) {
          Drupal.wysiwyg.editor.instance.ckeditor.addPlugin(pluginName, Drupal.settings.wysiwyg.plugins[format].drupal[pluginName], Drupal.settings.wysiwyg.plugins.drupal[pluginName]);
          registeredPlugins[pluginName] = true;
        }
      }
    }
  }
};


/**
 * Attach this editor to a target element.
 */
Drupal.wysiwyg.editor.attach.ckeditor = function(context, params, settings) {
  // Apply editor instance settings.
  CKEDITOR.config.customConfig = '';

  settings.on = {
    instanceReady: function(ev) {
      var editor = ev.editor;
      // Get a list of block, list and table tags from CKEditor's XHTML DTD.
      // @see http://docs.cksource.com/CKEditor_3.x/Developers_Guide/Output_Formatting.
      var dtd = CKEDITOR.dtd;
      var tags = CKEDITOR.tools.extend({}, dtd.$block, dtd.$listItem, dtd.$tableContent);
      // Set source formatting rules for each listed tag except <pre>.
      // Linebreaks can be inserted before or after opening and closing tags.
      if (settings.apply_source_formatting) {
        // Mimic FCKeditor output, by breaking lines between tags.
        for (var tag in tags) {
          if (tag == 'pre') {
            continue;
          }
          this.dataProcessor.writer.setRules(tag, {
            indent: true,
            breakBeforeOpen: true,
            breakAfterOpen: false,
            breakBeforeClose: false,
            breakAfterClose: true
          });
        }
      }
      else {
        // CKEditor adds default formatting to <br>, so we want to remove that
        // here too.
        tags.br = 1;
        // No indents or linebreaks;
        for (var tag in tags) {
          if (tag == 'pre') {
            continue;
          }
          this.dataProcessor.writer.setRules(tag, {
            indent: false,
            breakBeforeOpen: false,
            breakAfterOpen: false,
            breakBeforeClose: false,
            breakAfterClose: false
          });
        }
      }
    },

    pluginsLoaded: function(ev) {
      // Override the conversion methods to let Drupal plugins modify the data.
      var editor = ev.editor;
      if (editor.dataProcessor && Drupal.settings.wysiwyg.plugins[params.format]) {
        editor.dataProcessor.toHtml = CKEDITOR.tools.override(editor.dataProcessor.toHtml, function(originalToHtml) {
          // Convert raw data for display in WYSIWYG mode.
          return function(data, fixForBody) {
            for (var plugin in Drupal.settings.wysiwyg.plugins[params.format].drupal) {
              if (typeof Drupal.wysiwyg.plugins[plugin].attach == 'function') {
                data = Drupal.wysiwyg.plugins[plugin].attach(data, Drupal.settings.wysiwyg.plugins.drupal[plugin], editor.name);
                data = Drupal.wysiwyg.instances[params.field].prepareContent(data);
              }
            }
            return originalToHtml.call(this, data, fixForBody);
          };
        });
        editor.dataProcessor.toDataFormat = CKEDITOR.tools.override(editor.dataProcessor.toDataFormat, function(originalToDataFormat) {
          // Convert WYSIWYG mode content to raw data.
          return function(data, fixForBody) {
            data = originalToDataFormat.call(this, data, fixForBody);
            for (var plugin in Drupal.settings.wysiwyg.plugins[params.format].drupal) {
              if (typeof Drupal.wysiwyg.plugins[plugin].detach == 'function') {
                data = Drupal.wysiwyg.plugins[plugin].detach(data, Drupal.settings.wysiwyg.plugins.drupal[plugin], editor.name);
              }
            }
            return data;
          };
        });
      }
    },

    selectionChange: function (event) {
      var pluginSettings = Drupal.settings.wysiwyg.plugins[params.format];
      if (pluginSettings && pluginSettings.drupal) {
        $.each(pluginSettings.drupal, function (name) {
          var plugin = Drupal.wysiwyg.plugins[name];
          if ($.isFunction(plugin.isNode)) {
            var node = event.data.selection.getSelectedElement();
            var state = plugin.isNode(node ? node.$ : null) ? CKEDITOR.TRISTATE_ON : CKEDITOR.TRISTATE_OFF;
            event.editor.getCommand(name).setState(state);
          }
        });
      }
    },

    focus: function(ev) {
      Drupal.wysiwyg.activeId = ev.editor.name;
    }
  };

  // Attach editor.
  CKEDITOR.replace(params.field, settings);
};

/**
 * Detach a single or all editors.
 *
 * @todo 3.x: editor.prototype.getInstances() should always return an array
 *   containing all instances or the passed in params.field instance, but
 *   always return an array to simplify all detach functions.
 */
Drupal.wysiwyg.editor.detach.ckeditor = function(context, params) {
  if (typeof params != 'undefined') {
    var instance = CKEDITOR.instances[params.field];
    if (instance) {
      instance.destroy();
    }
  }
  else {
    for (var instanceName in CKEDITOR.instances) {
      CKEDITOR.instances[instanceName].destroy();
    }
  }
};

Drupal.wysiwyg.editor.instance.ckeditor = {
  addPlugin: function(pluginName, settings, pluginSettings) {
    CKEDITOR.plugins.add(pluginName, {
      // Wrap Drupal plugin in a proxy pluygin.
      init: function(editor) {
        if (settings.css) {
          editor.on('mode', function(ev) {
            if (ev.editor.mode == 'wysiwyg') {
              // Inject CSS files directly into the editing area head tag.
              $('head', $('#cke_contents_' + ev.editor.name + ' iframe').eq(0).contents()).append('<link rel="stylesheet" href="' + settings.css + '" type="text/css" >');
            }
          });
        }
        if (typeof Drupal.wysiwyg.plugins[pluginName].invoke == 'function') {
          var pluginCommand = {
            exec: function (editor) {
              var data = { format: 'html', node: null, content: '' };
              var selection = editor.getSelection();
              if (selection) {
                data.node = selection.getSelectedElement();
                if (data.node) {
                  data.node = data.node.$;
                }
                if (selection.getType() == CKEDITOR.SELECTION_TEXT) {
                  if (CKEDITOR.env.ie) {
                    data.content = selection.getNative().createRange().text;
                  }
                  else {
                    data.content = selection.getNative().toString();
                  }
                }
                else if (data.node) {
                  // content is supposed to contain the "outerHTML".
                  data.content = data.node.parentNode.innerHTML;
                }
              }
              Drupal.wysiwyg.plugins[pluginName].invoke(data, pluginSettings, editor.name);
            }
          };
          editor.addCommand(pluginName, pluginCommand);
        }
        editor.ui.addButton(pluginName, {
          label: settings.iconTitle,
          command: pluginName,
          icon: settings.icon
        });

        // @todo Add button state handling.
      }
    });
  },
  prepareContent: function(content) {
    // @todo Don't know if we need this yet.
    return content;
  },
  insert: function(content) {
    content = this.prepareContent(content);
    CKEDITOR.instances[this.field].insertHtml(content);
  }
};

})(jQuery);