"""LibraryManager.set_track_location: repoint a track at a moved/renamed file.

It's a path repair, not a content edit — so it persists the new location and
notifies the UI, but must not touch date_modified or write tags.
"""

from lintunes.models import Library, Track
from lintunes.library_manager import LibraryManager


def _manager(tmp_path):
    track = Track(track_id=1, name="Song",
                  location="/old/path/song.mp3",
                  date_modified="2020-01-01T00:00:00")
    return LibraryManager(Library(tracks={1: track}), tmp_path), track


def test_set_track_location_repoints_and_persists(qapp, tmp_path):
    manager, track = _manager(tmp_path)
    updates, edits = [], []
    manager.track_updated.connect(updates.append)
    manager.track_fields_edited.connect(lambda tid, fields: edits.append(tid))

    manager.set_track_location(1, "/new/path/from there to here.mp3")

    assert track.location == "/new/path/from there to here.mp3"
    assert manager._dirty_tracks                      # will be saved
    assert updates == [1]                             # UI refreshes the row
    assert edits == []                                # not a metadata edit
    assert track.date_modified == "2020-01-01T00:00:00"  # untouched


def test_set_track_location_noop_when_unchanged(qapp, tmp_path):
    manager, track = _manager(tmp_path)
    updates = []
    manager.track_updated.connect(updates.append)

    manager.set_track_location(1, track.location)

    assert updates == []
    assert not manager._dirty_tracks


def test_set_track_location_ignores_unknown_track(qapp, tmp_path):
    manager, _track = _manager(tmp_path)
    manager.set_track_location(999, "/whatever.mp3")  # no such track
    assert not manager._dirty_tracks