decide.nolog.cz/app/controllers/poll.ts

import Controller from '@ember/controller';
import { inject as service } from '@ember/service';
import { isPresent, isEmpty } from '@ember/utils';
import { action } from '@ember/object';
import { DateTime } from 'luxon';
import { tracked } from '@glimmer/tracking';
import type IntlService from 'ember-intl/services/intl';
import type RouterService from '@ember/routing/router-service';
import type { PollRouteModel } from 'croodle/routes/poll';

export default class PollController extends Controller {
  @service declare intl: IntlService;
  @service declare router: RouterService;

  declare model: PollRouteModel;

  queryParams = ['encryptionKey'];
  encryptionKey = '';

  @tracked timezoneChoosen = false;
  @tracked shouldUseLocalTimezone = false;

  get showExpirationWarning() {
    const { model: poll } = this;
    const { expirationDate } = poll;

    if (isEmpty(expirationDate)) {
      return false;
    }
    return (
      DateTime.local().plus({ weeks: 2 }) >= DateTime.fromISO(expirationDate)
    );
  }

  /*
   * return true if current timezone differs from timezone poll got created with
   */
  get timezoneDiffers() {
    const { model: poll } = this;
    const { timezone: pollTimezone } = poll;

    return (
      isPresent(pollTimezone) &&
      Intl.DateTimeFormat().resolvedOptions().timeZone !== pollTimezone
    );
  }

  get mustChooseTimezone() {
    return this.timezoneDiffers && !this.timezoneChoosen;
  }

  get timezone() {
    const { model: poll, shouldUseLocalTimezone } = this;

    return shouldUseLocalTimezone || !poll.timezone ? undefined : poll.timezone;
  }

  @action
  useLocalTimezone() {
    this.shouldUseLocalTimezone = true;
    this.timezoneChoosen = true;
  }

  @action
  usePollTimezone() {
    this.timezoneChoosen = true;
  }
}