const { describe, it } = require('node:test');
const assert = require('node:assert/strict');
const { parseVtt } = require('../lib/vtt-parser.js');

describe('parseVtt', () => {
  it('parses single cue with speaker tag', () => {
    const vtt = `WEBVTT

00:00:01.000 --> 00:00:04.000
<v Christian Kauer>Hallo zusammen.</v>
`;
    const result = parseVtt(vtt);
    assert.deepEqual(result, [
      { speaker: 'Christian Kauer', text: 'Hallo zusammen.', start: '00:00:01.000', end: '00:00:04.000' }
    ]);
  });

  it('merges consecutive cues from same speaker', () => {
    const vtt = `WEBVTT

00:00:01.000 --> 00:00:04.000
<v Frank Herberg>Wir können das prüfen.</v>

00:00:04.500 --> 00:00:07.000
<v Frank Herberg>Lass uns Borgstedt fragen.</v>
`;
    const result = parseVtt(vtt, { mergeConsecutive: true });
    assert.equal(result.length, 1);
    assert.equal(result[0].speaker, 'Frank Herberg');
    assert.equal(result[0].text, 'Wir können das prüfen. Lass uns Borgstedt fragen.');
  });

  it('handles cues without speaker tag', () => {
    const vtt = `WEBVTT

00:00:01.000 --> 00:00:02.000
[Hintergrundgeräusch]
`;
    const result = parseVtt(vtt);
    assert.equal(result[0].speaker, null);
    assert.equal(result[0].text, '[Hintergrundgeräusch]');
  });

  it('returns empty array for empty vtt', () => {
    assert.deepEqual(parseVtt('WEBVTT\n\n'), []);
  });
});

describe('formatTranscript', () => {
  const { formatTranscript } = require('../lib/vtt-parser.js');

  it('formats cues as speaker: text lines', () => {
    const cues = [
      { speaker: 'Christian Kauer', text: 'Hallo.' },
      { speaker: 'Frank Herberg', text: 'Hi.' }
    ];
    assert.equal(formatTranscript(cues), 'Christian Kauer: Hallo.\nFrank Herberg: Hi.');
  });

  it('uses [unknown] for null speaker', () => {
    const cues = [{ speaker: null, text: '[Lärm]' }];
    assert.equal(formatTranscript(cues), '[unknown]: [Lärm]');
  });
});