from pathlib import Path

from backend.app.utils.paths import (
    derive_subdir,
    derive_top_level_artist,
    hash_suffixed_name,
)

IMPORT = Path("/import")


def test_derive_subdir_nested():
    assert derive_subdir(Path("/import/Alice/sub/x.png"), IMPORT) == "Alice/sub"


def test_derive_subdir_one_level():
    assert derive_subdir(Path("/import/Alice/x.png"), IMPORT) == "Alice"


def test_derive_subdir_root():
    assert derive_subdir(Path("/import/x.png"), IMPORT) == ""


def test_derive_subdir_outside_root():
    assert derive_subdir(Path("/elsewhere/x.png"), IMPORT) == ""


def test_hash_suffixed_name():
    h = "abcdef1234567890" + "0" * 48
    assert hash_suffixed_name("photo", h, ".png") == "photo__abcdef1234.png"


def test_derive_top_level_artist_present():
    assert derive_top_level_artist(Path("/import/Alice/x.png"), IMPORT) == "Alice"


def test_derive_top_level_artist_nested():
    assert derive_top_level_artist(Path("/import/Alice/sub/x.png"), IMPORT) == "Alice"


def test_derive_top_level_artist_root():
    assert derive_top_level_artist(Path("/import/x.png"), IMPORT) is None