"""Tests für Cover-Funktionen."""

from pathlib import Path

from musiksammlung.cover import find_cover


class TestFindCover:
    """Tests für find_cover."""

    def test_finds_frontcover_jpg(self, tmp_path: Path) -> None:
        (tmp_path / "frontcover.jpg").touch()
        assert find_cover(tmp_path, "front") == tmp_path / "frontcover.jpg"

    def test_finds_frontcover_png(self, tmp_path: Path) -> None:
        (tmp_path / "frontcover.png").touch()
        assert find_cover(tmp_path, "front") == tmp_path / "frontcover.png"

    def test_jpg_preferred_over_png(self, tmp_path: Path) -> None:
        (tmp_path / "frontcover.jpg").touch()
        (tmp_path / "frontcover.png").touch()
        # .jpg wird zuerst geprüft
        assert find_cover(tmp_path, "front") == tmp_path / "frontcover.jpg"

    def test_finds_backcover(self, tmp_path: Path) -> None:
        (tmp_path / "backcover.jpg").touch()
        assert find_cover(tmp_path, "back") == tmp_path / "backcover.jpg"

    def test_returns_none_if_missing(self, tmp_path: Path) -> None:
        assert find_cover(tmp_path, "front") is None
        assert find_cover(tmp_path, "back") is None

    def test_follows_symlink(self, tmp_path: Path) -> None:
        real = tmp_path / "original.jpg"
        real.touch()
        link = tmp_path / "frontcover.jpg"
        link.symlink_to(real)
        assert find_cover(tmp_path, "front") == link

    def test_ignores_wrong_names(self, tmp_path: Path) -> None:
        (tmp_path / "cover.jpg").touch()
        (tmp_path / "back.jpg").touch()
        assert find_cover(tmp_path, "front") is None