// Copyright (c) Jupyter Development Team.
// Distributed under the terms of the Modified BSD License.
import { ILayoutRestorer } from '@jupyterlab/application';
import { WidgetTracker } from '@jupyterlab/apputils';
import {
  MarkdownViewer,
  MarkdownViewerFactory,
  IMarkdownViewerTracker
} from '@jupyterlab/markdownviewer';
import {
  IRenderMimeRegistry,
  markdownRendererFactory
} from '@jupyterlab/rendermime';
import { ISettingRegistry } from '@jupyterlab/settingregistry';
import { PathExt } from '@jupyterlab/coreutils';
import { IMiddleToken } from '@jupyterlab/example-federated-middle';

/**
 * The command IDs used by the markdownviewer plugin.
 */
let CommandIDs;
(function (CommandIDs) {
  CommandIDs.markdownPreview = 'markdownviewer:open';
  CommandIDs.markdownEditor = 'markdownviewer:edit';
})(CommandIDs || (CommandIDs = {}));
/**
 * The name of the factory that creates markdown viewer widgets.
 */
const FACTORY = 'Markdown Preview (Federated)';
/**
 * The markdown viewer plugin.
 */
const plugin = {
  activate,
  id: '@jupyterlab/example-federated-md:plugin',
  provides: IMarkdownViewerTracker,
  requires: [
    ILayoutRestorer,
    IRenderMimeRegistry,
    ISettingRegistry,
    IMiddleToken
  ],
  autoStart: true
};
/**
 * Activate the markdown viewer plugin.
 */
function activate(app, restorer, rendermime, settingRegistry, middleToken) {
  console.log(middleToken);
  const { commands, docRegistry } = app;
  // Add the markdown renderer factory.
  rendermime.addFactory(markdownRendererFactory);
  const namespace = 'markdownviewer-widget';
  const tracker = new WidgetTracker({
    namespace
  });
  let config = Object.assign({}, MarkdownViewer.defaultConfig);
  /**
   * Update the settings of a widget.
   */
  function updateWidget(widget) {
    Object.keys(config).forEach(k => {
      let _a;
      widget.setOption(
        k,
        (_a = config[k]) !== null && _a !== void 0 ? _a : null
      );
    });
  }
  /**
   * Update the setting values.
   */
  function updateSettings(settings) {
    config = settings.composite;
    tracker.forEach(widget => {
      updateWidget(widget.content);
    });
  }
  // Fetch the initial state of the settings.
  settingRegistry
    .load(plugin.id)
    .then(settings => {
      settings.changed.connect(() => {
        updateSettings(settings);
      });
      updateSettings(settings);
    })
    .catch(reason => {
      console.error(reason.message);
    });
  // Register the MarkdownViewer factory.
  const factory = new MarkdownViewerFactory({
    rendermime,
    name: FACTORY,
    primaryFileType: docRegistry.getFileType('markdown'),
    fileTypes: ['markdown'],
    defaultRendered: ['markdown']
  });
  factory.widgetCreated.connect((sender, widget) => {
    // Notify the widget tracker if restore data needs to update.
    widget.context.pathChanged.connect(() => {
      void tracker.save(widget);
    });
    // Handle the settings of new widgets.
    updateWidget(widget.content);
    void tracker.add(widget);
  });
  docRegistry.addWidgetFactory(factory);
  // Handle state restoration.
  void restorer.restore(tracker, {
    command: 'docmanager:open',
    args: widget => ({ path: widget.context.path, factory: FACTORY }),
    name: widget => widget.context.path
  });
  commands.addCommand(CommandIDs.markdownPreview, {
    label: 'Markdown Preview',
    execute: args => {
      const path = args['path'];
      if (typeof path !== 'string') {
        return;
      }
      return commands.execute('docmanager:open', {
        path,
        factory: FACTORY,
        options: args['options']
      });
    }
  });
  commands.addCommand(CommandIDs.markdownEditor, {
    execute: () => {
      const widget = tracker.currentWidget;
      if (!widget) {
        return;
      }
      const path = widget.context.path;
      return commands.execute('docmanager:open', {
        path,
        factory: 'Editor',
        options: {
          mode: 'split-right'
        }
      });
    },
    isVisible: () => {
      const widget = tracker.currentWidget;
      return (
        (widget && PathExt.extname(widget.context.path) === '.md') || false
      );
    },
    label: 'Show Markdown Editor'
  });
  app.contextMenu.addItem({
    command: CommandIDs.markdownEditor,
    selector: '.jp-RenderedMarkdown'
  });
  return tracker;
}
/**
 * Export the plugin as default.
 */
export default plugin;
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