import { buildIcs } from './ics';

const NOW = new Date('2026-10-14T09:30:00.000Z');

describe('buildIcs', () => {
  it('writes all-day events with an exclusive end', () => {
    const ics = buildIcs(
      'TaskStream',
      [
        {
          uid: 'issue-1@taskstream',
          start: '2026-10-20',
          summary: 'WEB-1 · Login',
        },
        {
          uid: 'sprint-1@taskstream',
          start: '2026-10-05',
          end: '2026-10-19',
          summary: 'Sprint 4',
        },
      ],
      NOW,
    );
    expect(ics.startsWith('BEGIN:VCALENDAR\r\nVERSION:2.0\r\n')).toBe(true);
    expect(ics.endsWith('END:VCALENDAR\r\n')).toBe(true);
    expect(ics).toContain('DTSTAMP:20261014T093000Z');
    expect(ics).toContain(
      'DTSTART;VALUE=DATE:20261020\r\nDTEND;VALUE=DATE:20261021',
    );
    expect(ics).toContain(
      'DTSTART;VALUE=DATE:20261005\r\nDTEND;VALUE=DATE:20261020',
    );
    expect(ics.split('BEGIN:VEVENT')).toHaveLength(3);
  });

  it('escapes text and skips what has no date', () => {
    const ics = buildIcs(
      'Ana; López, QA',
      [
        { uid: 'a', start: '2026-10-20', summary: 'Pago; roto, en\nSafari' },
        { uid: 'b', start: '', summary: 'sin fecha' },
      ],
      NOW,
    );
    expect(ics).toContain('X-WR-CALNAME:Ana\\; López\\, QA');
    expect(ics).toContain('SUMMARY:Pago\\; roto\\, en\\nSafari');
    expect(ics).not.toContain('sin fecha');
  });

  it('folds long lines at 75 octets without splitting a character', () => {
    const summary = 'Revisión de la exportación á'.repeat(5);
    const ics = buildIcs(
      'x',
      [{ uid: 'u', start: '2026-10-20', summary }],
      NOW,
    );
    for (const line of ics.split('\r\n'))
      expect(Buffer.byteLength(line, 'utf8')).toBeLessThanOrEqual(75);
    // Unfolding gives the text back.
    expect(ics.replace(/\r\n /g, '')).toContain(`SUMMARY:${summary}`);
  });
});