"""Characterization parity: the extracted safety logic matches the donor on the
same fixture files (real exiftool-written keywords)."""

import shutil
import subprocess
import sys
from pathlib import Path

import numpy as np
import pytest
from PIL import Image

from photo_pipeline.integrations import exiftool
from photo_pipeline.services import safety

# The donor is frozen in the read-only archive (US07-01); parity still compares
# against it, so this suite is the second and last place that may import it.
ARCHIVED_SOURCES = Path(__file__).resolve().parents[2] / "legacy_cli_archive" / "src"

EXIFTOOL = shutil.which("exiftool")
pytestmark = pytest.mark.skipif(EXIFTOOL is None, reason="exiftool not installed")


def _jpeg(path, seed=1):
    path.parent.mkdir(parents=True, exist_ok=True)
    arr = np.random.default_rng(seed).integers(0, 256, (32, 32, 3), dtype=np.uint8)
    Image.fromarray(arr).save(path, quality=90)
    return str(path)


def _tag(path, keyword):
    subprocess.run(
        ["exiftool", "-m", "-overwrite_original", f"-Keywords={keyword}", f"-Subject={keyword}", path],
        check=True,
        capture_output=True,
    )


def test_extracted_marks_and_partition_match_donor(tmp_path):
    sys.path.insert(0, str(ARCHIVED_SOURCES))  # the donor lives in the archive now
    donor_exif = pytest.importorskip("nsfwtag.exif")

    nsfw = _jpeg(tmp_path / "nsfw.jpg", 1)
    sfw = _jpeg(tmp_path / "sfw.jpg", 2)
    plain = _jpeg(tmp_path / "plain.jpg", 3)
    _tag(nsfw, "nsfw")
    _tag(sfw, "sfw")
    paths = [nsfw, sfw, plain]

    # Donor behavior.
    donor_marks = donor_exif.read_marks(paths)
    donor_nsfw = donor_exif.read_tagged(paths, "nsfw")

    # Extracted behavior on the same files.
    keyword_sets = exiftool.read_keyword_sets(paths)
    extracted_marks = safety.marks_from_keywords(keyword_sets)
    _, skipped = safety.partition_nsfw(keyword_sets)

    assert extracted_marks == donor_marks
    assert set(skipped) == donor_nsfw
    assert extracted_marks["nsfw"] == {nsfw}
    assert extracted_marks["sfw"] == {sfw}