import { describe, expect, it } from 'vitest';

import {
  formatDateEn,
  formatDateFr,
  formatHoursText,
  formatNextChangeEn,
  formatNextChangeFr,
  formatTimeEn,
  shortDayLabelEn,
  shortDayLabelFr,
} from './format';

describe('formatDateFr / formatDateEn', () => {
  it('writes the day and month in full', () => {
    expect(formatDateFr('2026-09-20')).toBe('Dimanche 20 septembre');
    expect(formatDateEn('2026-09-20')).toBe('Sunday 20 September');
  });

  it('does not pad the day number', () => {
    expect(formatDateFr('2026-09-01')).toBe('Mardi 1 septembre');
    expect(formatDateEn('2026-09-01')).toBe('Tuesday 1 September');
  });

  it('handles every month', () => {
    expect(formatDateFr('2026-01-15')).toBe('Jeudi 15 janvier');
    expect(formatDateFr('2026-08-15')).toBe('Samedi 15 août');
    expect(formatDateFr('2026-12-25')).toBe('Vendredi 25 décembre');
    expect(formatDateEn('2026-12-25')).toBe('Friday 25 December');
  });
});

describe('short day labels', () => {
  it('uses three letters, Monday first on the screen', () => {
    expect([1, 2, 3, 4, 5, 6, 0].map(shortDayLabelFr)).toEqual([
      'Lun',
      'Mar',
      'Mer',
      'Jeu',
      'Ven',
      'Sam',
      'Dim',
    ]);
    expect([1, 2, 3, 4, 5, 6, 0].map(shortDayLabelEn)).toEqual([
      'Mon',
      'Tue',
      'Wed',
      'Thu',
      'Fri',
      'Sat',
      'Sun',
    ]);
  });
});

describe('formatHoursText', () => {
  it('renders a single slot', () => {
    expect(formatHoursText([{ open: '10:00', close: '18:30' }])).toBe('10:00 – 18:30');
  });

  it('joins several slots with a middle dot', () => {
    expect(
      formatHoursText([
        { open: '10:00', close: '13:00' },
        { open: '14:00', close: '18:30' },
      ]),
    ).toBe('10:00 – 13:00 · 14:00 – 18:30');
  });

  it('returns an empty string when the shop is closed', () => {
    expect(formatHoursText([])).toBe('');
  });
});

describe('formatTimeEn', () => {
  it('uses the twelve-hour clock', () => {
    expect(formatTimeEn('18:30')).toBe('6:30 pm');
    expect(formatTimeEn('10:00')).toBe('10:00 am');
  });

  it('names noon and midnight correctly', () => {
    expect(formatTimeEn('12:00')).toBe('12:00 pm');
    expect(formatTimeEn('00:30')).toBe('12:30 am');
  });
});

describe('formatNextChange', () => {
  it('announces today’s closing time', () => {
    expect(formatNextChangeFr({ kind: 'CLOSES', date: '2026-09-20', time: '18:30' }, '2026-09-20')).toBe(
      'Ferme à 18:30',
    );
    expect(formatNextChangeEn({ kind: 'CLOSES', date: '2026-09-20', time: '18:30' }, '2026-09-20')).toBe(
      'Closes at 6:30 pm',
    );
  });

  it('announces a reopening later today', () => {
    expect(formatNextChangeFr({ kind: 'OPENS', date: '2026-09-20', time: '14:00' }, '2026-09-20')).toBe(
      'Ouvre à 14:00',
    );
    expect(formatNextChangeEn({ kind: 'OPENS', date: '2026-09-20', time: '14:00' }, '2026-09-20')).toBe(
      'Opens at 2:00 pm',
    );
  });

  it('announces tomorrow by name', () => {
    expect(formatNextChangeFr({ kind: 'OPENS', date: '2026-09-21', time: '10:00' }, '2026-09-20')).toBe(
      'Ouvre demain à 10:00',
    );
    expect(formatNextChangeEn({ kind: 'OPENS', date: '2026-09-21', time: '10:00' }, '2026-09-20')).toBe(
      'Opens tomorrow at 10:00 am',
    );
  });

  it('names the weekday when the reopening is further out', () => {
    expect(formatNextChangeFr({ kind: 'OPENS', date: '2026-09-22', time: '10:00' }, '2026-09-20')).toBe(
      'Ouvre mardi à 10:00',
    );
    expect(formatNextChangeEn({ kind: 'OPENS', date: '2026-09-22', time: '10:00' }, '2026-09-20')).toBe(
      'Opens Tuesday at 10:00 am',
    );
  });

  it('says nothing when there is nothing to announce', () => {
    expect(formatNextChangeFr(null, '2026-09-20')).toBe('');
    expect(formatNextChangeEn(null, '2026-09-20')).toBe('');
  });
});