from pathlib import Path

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

IMPORT = Path("/import")


def test_filehash_from_url_extracts_lowercased_md5():
    url = "https://c10.patreonusercontent.com/4/patreon-media/p/post/1/AbC123DeF456789012345678901234EF/1/img.png?token=x"
    assert filehash_from_url(url) == "abc123def456789012345678901234ef"


def test_filehash_from_url_none_and_no_hash():
    assert filehash_from_url(None) is None
    assert filehash_from_url("") is None
    assert filehash_from_url("https://example.test/a.png") is None


def test_filehash_from_url_query_unescaping_irrelevant():
    # The hash sits in the path before the query, so entity-escaped ampersands
    # in the query never affect the match (render-time matches escaped srcs).
    base = "https://cdn.test/p/0123456789abcdef0123456789ABCDEF/x.jpg"
    assert filehash_from_url(base + "?a=1&b=2") == "0123456789abcdef0123456789abcdef"


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