"""Tests für die Playlist-Generierung."""

from pathlib import Path

from musiksammlung.models import Album, Disc, Track
from musiksammlung.playlist import generate_playlist


def _make_album(n_tracks: int = 2, n_discs: int = 1) -> Album:
    discs = [
        Disc(
            disc_number=d,
            tracks=[
                Track(track_number=i, title=f"Disc{d} Song {i}") for i in range(1, n_tracks + 1)
            ],
        )
        for d in range(1, n_discs + 1)
    ]
    return Album(artist="Artist", album="TestAlbum", year=2000, discs=discs)


def test_generate_playlist_single_disc(tmp_path: Path):
    """M3U für Single-CD: keine CD-Prefix, korrekte Dateinamen."""
    album = _make_album(n_tracks=2, n_discs=1)

    # Dummy-Audiodateien im Schema 01_-_Titel_-_Künstler
    (tmp_path / "01_-_Disc1_Song_1_-_Artist.flac").touch()
    (tmp_path / "02_-_Disc1_Song_2_-_Artist.flac").touch()

    playlist_path = generate_playlist(album, tmp_path)
    assert playlist_path.exists()

    content = playlist_path.read_text()
    assert "#EXTM3U" in content
    assert "01_-_Disc1_Song_1_-_Artist.flac" in content
    assert "02_-_Disc1_Song_2_-_Artist.flac" in content
    # Kein CD-Prefix bei Single-Disc
    assert "CD1/" not in content


def test_generate_playlist_multi_disc(tmp_path: Path):
    """M3U für Multi-CD: CD-Prefix in Pfaden."""
    album = _make_album(n_tracks=2, n_discs=2)

    cd1 = tmp_path / "CD1"
    cd2 = tmp_path / "CD2"
    cd1.mkdir()
    cd2.mkdir()
    (cd1 / "01_-_Disc1_Song_1_-_Artist.flac").touch()
    (cd1 / "02_-_Disc1_Song_2_-_Artist.flac").touch()
    (cd2 / "01_-_Disc2_Song_1_-_Artist.flac").touch()
    (cd2 / "02_-_Disc2_Song_2_-_Artist.flac").touch()

    playlist_path = generate_playlist(album, tmp_path)
    content = playlist_path.read_text()

    assert "CD1/01_-_Disc1_Song_1_-_Artist.flac" in content
    assert "CD2/01_-_Disc2_Song_1_-_Artist.flac" in content


def test_generate_playlist_filename(tmp_path: Path):
    """Playlist-Dateiname ist sanitierter Albumname."""
    album = Album(
        artist="A",
        album="Mein Album",
        discs=[Disc(disc_number=1, tracks=[Track(track_number=1, title="Song")])],
    )
    playlist_path = generate_playlist(album, tmp_path)
    assert playlist_path.name == "Mein_Album.m3u"


def test_generate_playlist_extinf_contains_title(tmp_path: Path):
    """#EXTINF-Einträge enthalten den originalen Titel."""
    album = Album(
        artist="A",
        album="X",
        discs=[
            Disc(
                disc_number=1,
                tracks=[Track(track_number=1, title="Für Elise")],
            )
        ],
    )
    (tmp_path / "01_-_Für_Elise_-_A.flac").touch()
    playlist_path = generate_playlist(album, tmp_path)
    content = playlist_path.read_text()
    assert "#EXTINF:0,Für Elise" in content


def test_generate_playlist_fallback_if_file_missing(tmp_path: Path):
    """Wenn Audiodatei fehlt, wird Fallback-Name erzeugt (kein Absturz)."""
    album = Album(
        artist="A",
        album="X",
        discs=[Disc(disc_number=1, tracks=[Track(track_number=1, title="Ghost")])],
    )
    # Keine Audiodatei anlegen
    playlist_path = generate_playlist(album, tmp_path)
    content = playlist_path.read_text()
    assert "01_-_Ghost.flac" in content