import {HOUR} from '@/units.js';
import {ZonedDateTime} from '@/';
import {describe, it, expect} from 'vitest';
import {TimeZone} from '@clarify/zone-data';
import importer from '@clarify/zone-data/importer';

let saoPauloFormatter = new Intl.DateTimeFormat('nb-no', {
  timeStyle: 'long',
  dateStyle: 'short',
  timeZone: 'America/Sao_Paulo',
});

describe('ZonedDateTime#startOfDay', () => {
  it('adds day - 1', async () => {
    let timeZone = new TimeZone('Test/StartOfDay', [1679958000000, null], [-60, -120]);
    let date = new ZonedDateTime(1679958000000 + HOUR * 3, timeZone);
    expect(date.hour).toEqual(4);
    expect(date.day).toEqual(28);

    date = date.startOfDay();
    expect(date.hour).toEqual(1);
    expect(date.day).toEqual(28);
  });

  it('adds day - 12', async () => {
    let timeZone = new TimeZone('Test/StartOfDay', [1679965200000, null], [-60, -120]);

    let date = new ZonedDateTime(1679965200000 + HOUR * 3, timeZone);
    expect(date.hour).toEqual(6);
    expect(date.day).toEqual(28);

    date = date.startOfDay();
    expect(date.hour).toEqual(0);
    expect(date.day).toEqual(28);

    date = date.startOfDay();
    expect(date.hour).toEqual(0);
    expect(date.day).toEqual(28);
  });

  it('adds day + 12', async () => {
    let timeZone = new TimeZone('Test/StartOfDay', [1679965200000, null], [60, 120]);

    let date = new ZonedDateTime(1679965200000 + HOUR * 3, timeZone);
    expect(date.hour).toEqual(2);
    expect(date.day).toEqual(28);

    date = date.startOfDay();
    expect(date.hour).toEqual(0);
    expect(date.day).toEqual(28);

    date = date.startOfDay();
    expect(date.hour).toEqual(0);
    expect(date.day).toEqual(28);
  });

  it('works', async () => {
    let timeZone = await importer['America/Sao_Paulo']();
    let date = new ZonedDateTime(Date.UTC(2018, 10, 4, 10, 0, 0), timeZone);
    expect(saoPauloFormatter.format(new Date(date.epochMilliseconds))).equal('04.11.2018, 08:00:00 GMT-2');
    date = date.startOfDay();
    expect(date.hour, 'starts date at 01:00').toEqual(1);
    expect(saoPauloFormatter.format(new Date(date.epochMilliseconds))).equal('04.11.2018, 01:00:00 GMT-2');
  });
});