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import assert from 'node:assert/strict';
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import { test } from 'node:test';
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import { acceptMetadata, matchesPlayback, playbackView } from './playback.ts';
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import { initialState } from './session-state.ts';
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const first = { title: 'First', artist: '', durationMs: 2000 };
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const current = { revision: 0xffff_ffff, trackIndex: 0, trackCount: 2, track: first };
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test('metadata wraps revisions and ignores delayed or conflicting same-revision snapshots', () => {
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  const next = { ...current, revision: 0, trackIndex: 1, track: null };
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  assert.equal(acceptMetadata(current, next), next);
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  assert.equal(acceptMetadata(next, current), next);
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  assert.equal(acceptMetadata(next, { ...next, track: first }), next);
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  assert.equal(acceptMetadata(undefined, current), current);
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  assert.equal(matchesPlayback(current.revision, next), false);
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  assert.equal(matchesPlayback(0, next), true);
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  assert.equal(matchesPlayback(undefined, next), true);
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});
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test('unknown current metadata never falls back to an older HTTP song', () => {
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  const state = initialState();
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  state.room.track = first;
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  assert.equal(playbackView(state).track, first);
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  state.nowPlaying = { ...current, track: null };
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  assert.equal(playbackView(state).track, undefined);
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  assert.equal(playbackView(state).duration, 0);
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  state.nowPlaying = current;
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  state.paused = true;
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  assert.deepEqual(playbackView(state), {
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    track: first,
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    trackCount: 2,
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    position: 0,
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    duration: 2000,
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    paused: true,
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  });
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});