import Session from 'discourse/models/session';
import KeyValueStore from 'discourse/lib/key-value-store';
import AppEvents from 'discourse/lib/app-events';
import Store from 'discourse/models/store';
import DiscourseURL from 'discourse/lib/url';
import DiscourseLocation from 'discourse/lib/discourse-location';
import SearchService from 'discourse/services/search';
import { startTracking, default as TopicTrackingState } from 'discourse/models/topic-tracking-state';
import ScreenTrack from 'discourse/lib/screen-track';

const ALL_TARGETS = ['controller', 'component', 'route', 'model', 'adapter'];

export default {
  name: "inject-discourse-objects",

  initialize(container, app) {
    const appEvents = AppEvents.create();
    app.register('app-events:main', appEvents, { instantiate: false });
    ALL_TARGETS.forEach(t => app.inject(t, 'appEvents', 'app-events:main'));
    DiscourseURL.appEvents = appEvents;

    // backwards compatibility: remove when plugins have updated
    app.register('store:main', Store);

    app.register('service:store', Store);
    ALL_TARGETS.forEach(t => app.inject(t, 'store', 'service:store'));

    const messageBus = window.MessageBus;
    app.register('message-bus:main', messageBus, { instantiate: false });
    ALL_TARGETS.forEach(t => app.inject(t, 'messageBus', 'message-bus:main'));

    const currentUser = Discourse.User.current();
    app.register('current-user:main', currentUser, { instantiate: false });

    const topicTrackingState = TopicTrackingState.create({ messageBus, currentUser });
    app.register('topic-tracking-state:main', topicTrackingState, { instantiate: false });
    ALL_TARGETS.forEach(t => app.inject(t, 'topicTrackingState', 'topic-tracking-state:main'));

    const siteSettings = Discourse.SiteSettings;
    app.register('site-settings:main', siteSettings, { instantiate: false });
    ALL_TARGETS.forEach(t => app.inject(t, 'siteSettings', 'site-settings:main'));

    const site = Discourse.Site.current();
    app.register('site:main', site, { instantiate: false });
    ALL_TARGETS.forEach(t => app.inject(t, 'site', 'site:main'));

    app.register('search-service:main', SearchService);
    ALL_TARGETS.forEach(t => app.inject(t, 'searchService', 'search-service:main'));

    const session = Session.current();
    app.register('session:main', session, { instantiate: false });
    ALL_TARGETS.forEach(t => app.inject(t, 'session', 'session:main'));

    const screenTrack = new ScreenTrack(
      topicTrackingState,
      siteSettings,
      session,
      currentUser
    );

    app.register('screen-track:main', screenTrack, { instantiate: false });
    ['component', 'route'].forEach(t => app.inject(t, 'screenTrack', 'screen-track:main'));

    if (currentUser) {
      ['component', 'route', 'controller'].forEach(t => {
        app.inject(t, 'currentUser', 'current-user:main');
      });
    }

    app.register('location:discourse-location', DiscourseLocation);

    const keyValueStore = new KeyValueStore("discourse_");
    app.register('key-value-store:main', keyValueStore, { instantiate: false });
    ALL_TARGETS.forEach(t => app.inject(t, 'keyValueStore', 'key-value-store:main'));

    startTracking(topicTrackingState);
  }
};