import {DateTimeFormat} from '.';
import {defineProperty} from '@formatjs/intl-utils';
import {DateTimeFormatOptions} from './types';
import {
  toLocaleString as _toLocaleString,
  toLocaleDateString as _toLocaleDateString,
  toLocaleTimeString as _toLocaleTimeString,
} from './to_locale_string';

// function supportsDateStyle() {
//   return !!(new Intl.DateTimeFormat(undefined, {
//     dateStyle: 'short',
//   } as any).resolvedOptions() as any).dateStyle;
// }

/**
 * https://bugs.chromium.org/p/chromium/issues/detail?id=865351
 */
function hasChromeLt71Bug() {
  return (
    new Intl.DateTimeFormat('en', {
      hourCycle: 'h11',
      hour: 'numeric',
    } as any).formatToParts(0)[2].type !== 'dayPeriod'
  );
}

if (
  !('DateTimeFormat' in Intl) ||
  !('formatToParts' in Intl.DateTimeFormat.prototype) ||
  hasChromeLt71Bug()
  // !supportsDateStyle()
) {
  defineProperty(Intl, 'DateTimeFormat', {value: DateTimeFormat});
  defineProperty(Date.prototype, 'toLocaleString', {
    value: function toLocaleString(
      locales?: string | string[],
      options?: DateTimeFormatOptions
    ) {
      return _toLocaleString(this, locales, options);
    },
  });
  // defineProperty(Date.prototype, 'toLocaleDateString', {
  //   value: function toLocaleDateString(
  //     locales?: string | string[],
  //     options?: DateTimeFormatOptions
  //   ) {
  //     return _toLocaleDateString(this, locales, options);
  //   },
  // });
  defineProperty(Date.prototype, 'toLocaleTimeString', {
    value: function toLocaleTimeString(
      locales?: string | string[],
      options?: DateTimeFormatOptions
    ) {
      return _toLocaleTimeString(this, locales, options);
    },
  });
}