const { test } = require('node:test');
const assert = require('node:assert');
const { scrapeNowPlaying } = require('../now-playing');

const emptyDoc = { querySelector: () => null };

function nav(metadata, playbackState) {
  return { mediaSession: { metadata, playbackState } };
}

test('reads track info from the Media Session when the player bar is absent', () => {
  const result = scrapeNowPlaying(
    emptyDoc,
    nav(
      {
        title: 'DOMINO',
        artist: 'Stray Kids',
        album: '',
        artwork: [
          { src: 'small.jpg', sizes: '60x60' },
          { src: 'big.jpg', sizes: '544x544' },
        ],
      },
      'playing'
    )
  );
  assert.deepStrictEqual(result, {
    title: 'DOMINO',
    artist: 'Stray Kids',
    albumArt: 'big.jpg',
    isPlaying: true,
  });
});

test('reports isPlaying false when the Media Session is paused', () => {
  const result = scrapeNowPlaying(emptyDoc, nav({ title: 'T', artist: 'A', artwork: [] }, 'paused'));
  assert.strictEqual(result.isPlaying, false);
  assert.strictEqual(result.albumArt, null);
});

test('returns null when nothing is loaded anywhere', () => {
  assert.strictEqual(scrapeNowPlaying(emptyDoc, nav(null, 'none')), null);
  assert.strictEqual(scrapeNowPlaying(emptyDoc, {}), null);
});

test('falls back to the legacy player-bar DOM when Media Session has no metadata', () => {
  const els = {
    'ytmusic-player-bar .title': { textContent: ' Old Song ' },
    'ytmusic-player-bar .byline': { textContent: 'Old Artist' },
    'ytmusic-player-bar img.image': { src: 'art.jpg' },
    '#play-pause-button': { getAttribute: (n) => (n === 'title' ? 'Pause' : null) },
  };
  const doc = { querySelector: (s) => els[s] || null };
  assert.deepStrictEqual(scrapeNowPlaying(doc, nav(null, 'none')), {
    title: 'Old Song',
    artist: 'Old Artist',
    albumArt: 'art.jpg',
    isPlaying: true,
  });
});