from lyra_worker._musicbrainz import _best_release_group

# Offline unit tests for the pure release-group selection logic. The live resolve()
# path (network) is covered by test_musicbrainz_live.py.


def _rg(title, primary_type):
    return {"id": title.lower(), "title": title, "primary-type": primary_type}


def test_prefers_album_over_same_titled_single():
    # Real-world "Off the Wall" bug: MusicBrainz returns the Single release-group
    # first, tied on title with the Album. We must pick the Album so a 10-track
    # download isn't tagged from the 2-track single's tracklist.
    groups = [_rg("Off the Wall", "Single"), _rg("Off the Wall", "Album")]
    assert _best_release_group("Off the Wall", groups)["primary-type"] == "Album"


def test_album_preference_is_order_independent():
    groups = [_rg("Off the Wall", "Album"), _rg("Off the Wall", "Single")]
    assert _best_release_group("Off the Wall", groups)["primary-type"] == "Album"


def test_closer_title_still_wins_over_album_type():
    # Title similarity dominates; the album-type preference only breaks ties.
    groups = [_rg("Continuum", "Single"), _rg("Continuum Deluxe Reissue", "Album")]
    assert _best_release_group("Continuum", groups)["title"] == "Continuum"


def test_below_threshold_returns_none():
    groups = [_rg("Something Totally Different", "Album")]
    assert _best_release_group("Off the Wall", groups) is None


def test_empty_groups_returns_none():
    assert _best_release_group("Off the Wall", []) is None