"""テスト用のダミーデータ（conftest の fixture）の前提を確かめる."""

import hashlib
from pathlib import Path

from conftest import TONGUE_COLOR_FOLDERS, write_dummy_png
from PIL import Image


def test_tongue_color_folders_has_nine_entries() -> None:
    assert len(TONGUE_COLOR_FOLDERS) == 9
    labels = {label for label, _ in TONGUE_COLOR_FOLDERS.values()}
    assert labels == {"light_red", "dark_red", "purple", "red", "pale"}
    # normal は light_red だけ（SPEC_02 の組み合わせの制約）
    for label, severity in TONGUE_COLOR_FOLDERS.values():
        assert (severity == "normal") == (label == "light_red")


def test_tongue_color_source_layout(tongue_color_source) -> None:
    root: Path = tongue_color_source.root
    folders = sorted(p.name for p in root.iterdir())
    assert folders == sorted(TONGUE_COLOR_FOLDERS)
    for folder in TONGUE_COLOR_FOLDERS:
        assert len(list((root / folder).iterdir())) == 2

    images = tongue_color_source.images
    assert len(images) == 18
    assert [img.number for img in images] == list(range(1, 19))
    for img in images:
        assert img.path == root / img.folder / f"{img.number}.png"
        assert img.path.is_file()
        assert (img.label, img.severity) == TONGUE_COLOR_FOLDERS[img.folder]


def test_tongue_color_source_images_are_distinct_valid_pngs(tongue_color_source) -> None:
    hashes = set()
    for img in tongue_color_source.images:
        hashes.add(hashlib.sha256(img.path.read_bytes()).hexdigest())
        with Image.open(img.path) as opened:
            assert opened.format == "PNG"
    assert len(hashes) == 18


def test_write_dummy_png_is_deterministic_and_unique(tmp_path: Path) -> None:
    a = write_dummy_png(tmp_path / "a" / "1.png", seed=300).read_bytes()
    b = write_dummy_png(tmp_path / "b" / "1.png", seed=300).read_bytes()
    c = write_dummy_png(tmp_path / "c" / "1.png", seed=300 + 256).read_bytes()
    assert a == b
    assert a != c


def test_store_dir_exists_and_is_empty(store_dir: Path) -> None:
    assert store_dir.is_dir()
    assert store_dir.name == "store"
    assert list(store_dir.iterdir()) == []