import {Instant} from './instant.js';
import {PlainDateTime} from './plain-date-time.js';
import {PlainDate} from './plain-date.js';
import {PlainTime} from './plain-time.js';
import type {TimeZone} from './time-zone.js';
import {ZonedDateTime} from './zoned-date-time.js';

let timeZone: string | null;

export const Now = {
  instant() {
    return new Instant(Date.now());
  },

  timeZoneId() {
    if (timeZone) {
      return timeZone;
    }
    let dateTimeFormatter = new Intl.DateTimeFormat();
    let {timeZone: timeZoneResolved} = dateTimeFormatter.resolvedOptions();
    timeZone = timeZoneResolved;
    return timeZoneResolved;
  },

  zonedDateTimeISO(timeZoneLike?: string | TimeZone) {
    return new ZonedDateTime(Date.now(), timeZoneLike ?? Now.timeZoneId());
  },

  plainDateISO() {
    let now = new Date();
    return new PlainDate(now.getFullYear(), now.getMonth() + 1, now.getDate());
  },

  plainDateTimeISO() {
    let now = new Date();
    return new PlainDateTime(
      now.getFullYear(),
      now.getMonth() + 1,
      now.getDate(),
      now.getHours(),
      now.getMinutes(),
      now.getSeconds(),
      now.getMilliseconds(),
    );
  },

  plainTimeISO() {
    let now = new Date();
    return new PlainTime(now.getHours(), now.getMinutes(), now.getSeconds(), now.getMilliseconds());
  },
};

Object.defineProperty(Now, Symbol.toStringTag, {
  value: 'Temporal.Now',
  writable: false,
  enumerable: false,
  configurable: true,
});