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import assert from 'node:assert/strict';
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import { test } from 'node:test';
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import { checkStartupMetadata, heartbeatMetadata, startupMetadata } from './publisher-metadata.ts';
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import type { Publisher } from './room-state.ts';
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const track = { title: 'First', artist: '', durationMs: 2000 };
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const nowPlaying = { revision: 0, trackIndex: 0, trackCount: 2, track };
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const offer = { type: 'offer' as const, sdp: 'v=0' };
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const publisher: Publisher = {
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  sessionId: 'test',
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  generation: 'test',
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  ready: true,
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  seen: 0,
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  channels: [],
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  track,
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  nowPlaying,
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  initialNowPlaying: nowPlaying,
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};
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test('startup normalization supports legacy, playlist-only and agreeing dual metadata', () => {
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  for (const fields of [{ nowPlaying }, { nowPlaying, track }]) {
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    const normalized = startupMetadata({ sessionDescription: offer, ...fields });
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    checkStartupMetadata(publisher, normalized);
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    assert.equal(normalized.track, track);
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  }
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  const legacy = { ...publisher, nowPlaying: undefined, initialNowPlaying: undefined };
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  checkStartupMetadata(legacy, startupMetadata({ sessionDescription: offer, track }));
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  assert.throws(() => startupMetadata({ sessionDescription: offer, nowPlaying, track: null }));
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  assert.throws(() =>
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    startupMetadata({ sessionDescription: offer, nowPlaying, track: { ...track, title: 'Other' } }),
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  );
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  assert.equal(
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    startupMetadata({ sessionDescription: offer, nowPlaying: { ...nowPlaying, track: null } })
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      .track,
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    undefined,
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  );
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});
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test('heartbeat accepts wrapping revisions but rejects conflicts and playlist resizing', () => {
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  const wrapped = { ...nowPlaying, revision: 0xffff_ffff };
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  assert.equal(heartbeatMetadata(wrapped, nowPlaying), nowPlaying);
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  assert.equal(heartbeatMetadata(nowPlaying, wrapped), nowPlaying);
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  assert.throws(() => heartbeatMetadata(nowPlaying, { ...nowPlaying, trackIndex: 1 }));
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  assert.throws(() => heartbeatMetadata(nowPlaying, { ...nowPlaying, revision: 1, trackCount: 3 }));
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  const playing = {
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    ...publisher,
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    track: { ...track, title: 'Second' },
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    nowPlaying: { ...nowPlaying, revision: 1 },
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  };
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  checkStartupMetadata(playing, startupMetadata({ sessionDescription: offer, nowPlaying }));
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});