import { describe, it, expect } from 'vitest';
import { dateToSerial, timeSerial } from '../../engine';
import { formatValue } from '../format';

describe('formatValue: date/time', () => {
  const day = dateToSerial(2026, 9, 2); // a Wednesday
  const noon = timeSerial(12, 0, 0);
  const dayAtNoon = day + noon;

  it('renders a date per locale', () => {
    expect(formatValue(day, 'de-DE', 'date')).toBe('02.09.2026');
    expect(formatValue(day, 'en-US', 'date')).toBe('09/02/2026');
    expect(formatValue(day, 'plain', 'date')).toBe('2026-09-02');
  });

  it('renders a time per locale', () => {
    expect(formatValue(noon, 'de-DE', 'time')).toBe('12:00');
    expect(formatValue(noon, 'plain', 'time')).toBe('12:00');
  });

  it('renders date + time together', () => {
    expect(formatValue(dayAtNoon, 'de-DE', 'datetime')).toBe('02.09.2026 12:00');
    expect(formatValue(dayAtNoon, 'plain', 'datetime')).toBe('2026-09-02 12:00');
  });

  it('date + time shows only the time for a bare time of day (no 1899 date)', () => {
    expect(formatValue(timeSerial(12, 23, 0), 'de-DE', 'datetime')).toBe('12:23');
  });

  it('"duration" keeps counting hours past 24', () => {
    expect(formatValue(37.5 / 24, 'de-DE', 'duration')).toBe('37:30');
    expect(formatValue(timeSerial(8, 5, 0), 'de-DE', 'duration')).toBe('08:05');
    expect(formatValue((100 * 3600 + 30) / 86400, 'de-DE', 'duration')).toBe('100:00:30');
    expect(formatValue(-1.5 / 24, 'de-DE', 'duration')).toBe('-01:30');
    expect(formatValue(0, 'de-DE', 'duration')).toBe('00:00');
  });

  it('empty cell / error still short-circuit before any date formatting', () => {
    expect(formatValue(null, 'de-DE', 'date')).toBe('');
  });

  it('"dateiso" renders YYYY-MM-DD regardless of the active locale', () => {
    expect(formatValue(day, 'de-DE', 'dateiso')).toBe('2026-09-02');
    expect(formatValue(day, 'en-US', 'dateiso')).toBe('2026-09-02');
    expect(formatValue(day, 'fr-FR', 'dateiso')).toBe('2026-09-02');
    expect(formatValue(day, 'plain', 'dateiso')).toBe('2026-09-02');
  });
});