"""`sync_snapshots` и `scripts/golden_update.py`: запись, сравнение, diff, лишние снимки (на временном каталоге)."""

import shutil
import sys
from pathlib import Path

import pytest
from golden_helpers import check_snapshot, golden_path, render, snapshot_text, sync_snapshots

from src.parser import get_parser
from tests.synthetic.generate import generate_all

FILES = 2  # s01 и s02
API_ROOT = Path(__file__).resolve().parents[2]


@pytest.fixture(scope="module")
def fixtures_root(tmp_path_factory: pytest.TempPathFactory) -> Path:
    root = tmp_path_factory.mktemp("fixtures")
    generate_all(root / "osv" / "synthetic")
    return root


@pytest.fixture
def root(fixtures_root: Path, tmp_path: Path) -> Path:
    """Копия дерева `osv/` на каждый тест: снимки не пересекаются между тестами."""
    copy = tmp_path / "fx"
    (copy / "osv" / "synthetic").mkdir(parents=True)
    for source in sorted((fixtures_root / "osv" / "synthetic").glob("s0[12]*")):
        (copy / "osv" / "synthetic" / source.name).write_bytes(source.read_bytes())
    return copy


def files_of(root: Path) -> list[Path]:
    return sorted((root / "osv" / "synthetic").glob("s*"))


def test_first_run_creates_snapshots_equal_to_render(root: Path) -> None:
    parser = get_parser()

    report = sync_snapshots(root, files_of(root), parser, write=True)

    assert len(report.created) == FILES
    assert report.changed == [] and report.orphans == [] and report.unchanged == 0
    for file in files_of(root):
        assert golden_path(root, file).read_text(encoding="utf-8") == snapshot_text(render(parser, file))
    assert (root / "golden" / "expected_osv_parse" / "synthetic" / "s01_variant2_header.json").is_file()


def test_second_run_reports_nothing_and_check_does_not_write(root: Path) -> None:
    parser = get_parser()
    sync_snapshots(root, files_of(root), parser, write=True)

    again = sync_snapshots(root, files_of(root), parser, write=False)

    assert again.unchanged == FILES
    assert not again.differs
    assert again.diffs == []


def test_changed_snapshot_gives_diff_and_check_leaves_it_untouched(root: Path) -> None:
    parser = get_parser()
    sync_snapshots(root, files_of(root), parser, write=True)
    target = golden_path(root, files_of(root)[0])
    original = target.read_text(encoding="utf-8")
    target.write_text(original.replace('"done"', '"needs_check"', 1), encoding="utf-8")

    checked = sync_snapshots(root, files_of(root), parser, write=False)

    assert checked.changed == [target.relative_to(root)]
    assert '-  "status": "needs_check"' in checked.diffs[0]
    assert '+  "status": "done"' in checked.diffs[0]
    assert target.read_text(encoding="utf-8") != original

    written = sync_snapshots(root, files_of(root), parser, write=True)

    assert written.changed == [target.relative_to(root)]
    assert target.read_text(encoding="utf-8") == original


def test_orphan_snapshot_is_reported_and_removed_on_write(root: Path) -> None:
    parser = get_parser()
    sync_snapshots(root, files_of(root), parser, write=True)
    orphan = root / "golden" / "expected_osv_parse" / "synthetic" / "s99_gone.json"
    orphan.write_text("{}\n", encoding="utf-8")

    checked = sync_snapshots(root, files_of(root), parser, write=False)
    assert checked.orphans == [orphan.relative_to(root)]
    assert orphan.exists()

    sync_snapshots(root, files_of(root), parser, write=True)
    assert not orphan.exists()


def test_snapshots_are_kept_when_their_source_directory_is_absent(root: Path) -> None:
    """T12.3: без `osv/synthetic` (или без реальных файлов) снимки этой части — не «лишние»: запись их не удаляет,
    сверка о них не сообщает как о расхождении, но перечисляет как сохранённые."""
    parser = get_parser()
    sync_snapshots(root, files_of(root), parser, write=True)
    synthetic_snapshots = sorted((root / "golden" / "expected_osv_parse" / "synthetic").glob("*.json"))
    real_snapshot = root / "golden" / "expected_osv_parse" / "rb" / "2024-Q1" / "сч 60.json"
    real_snapshot.parent.mkdir(parents=True)
    real_snapshot.write_text("{}\n", encoding="utf-8")
    shutil.rmtree(root / "osv" / "synthetic")

    report = sync_snapshots(root, [], parser, write=True)

    assert report.orphans == []
    assert not report.differs
    assert report.protected == sorted(
        [*(path.relative_to(root) for path in synthetic_snapshots), real_snapshot.relative_to(root)]
    )
    assert all(path.is_file() for path in synthetic_snapshots)
    assert real_snapshot.is_file()


def test_orphan_is_removed_only_within_a_present_source_directory(root: Path) -> None:
    """Реальных файлов нет, синтетика есть: лишний синтетический снимок удаляется, реальные снимки сохраняются."""
    parser = get_parser()
    real_snapshot = root / "golden" / "expected_osv_parse" / "rb" / "сч 60.json"
    real_snapshot.parent.mkdir(parents=True)
    real_snapshot.write_text("{}\n", encoding="utf-8")
    orphan = root / "golden" / "expected_osv_parse" / "synthetic" / "s99_gone.json"
    orphan.parent.mkdir(parents=True)
    orphan.write_text("{}\n", encoding="utf-8")

    report = sync_snapshots(root, files_of(root), parser, write=True)

    assert report.orphans == [orphan.relative_to(root)]
    assert report.protected == [real_snapshot.relative_to(root)]
    assert not orphan.exists()
    assert real_snapshot.is_file()


def test_golden_test_fails_with_hint_when_snapshot_is_missing(root: Path) -> None:
    """Spec «Новый файл без снимка»: golden-тест сообщает «нет снимка: выполните make golden-update»."""
    file = files_of(root)[0]

    with pytest.raises(pytest.fail.Exception, match=r"нет снимка: выполните make golden-update"):
        check_snapshot(root, file, get_parser())


def test_golden_test_fails_with_diff_when_parse_result_changed(root: Path) -> None:
    """Spec «Регрессия»: расхождение разбора со снимком — падение с diff по этому файлу."""
    parser = get_parser()
    sync_snapshots(root, files_of(root), parser, write=True)
    file = files_of(root)[0]
    check_snapshot(root, file, parser)  # свежий снимок совпадает с разбором
    target = golden_path(root, file)
    target.write_text(target.read_text(encoding="utf-8").replace('"level": 1', '"level": 7', 1), encoding="utf-8")

    with pytest.raises(pytest.fail.Exception, match=r"отличается от снимка") as failure:
        check_snapshot(root, file, parser)

    diff_lines = str(failure.value).splitlines()
    assert any(line.startswith("-") and '"level": 7' in line for line in diff_lines)
    assert any(line.startswith("+") and '"level": 1' in line for line in diff_lines)


def test_script_check_exit_codes(
    root: Path, monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]
) -> None:
    monkeypatch.setenv("ARM_KA_FIXTURES", str(root))
    monkeypatch.syspath_prepend(str(API_ROOT / "scripts"))
    sys.modules.pop("golden_update", None)
    import golden_update  # noqa: PLC0415 - модуль-скрипт

    assert golden_update.main(["--check"]) == 1
    assert golden_update.main([]) == 0
    assert golden_update.main(["--check"]) == 0
    shutil.rmtree(root / "osv" / "synthetic")
    capsys.readouterr()
    assert golden_update.main([]) == 0
    assert "снимок сохранён (нет исходного каталога)" in capsys.readouterr().err
    assert (root / "golden" / "expected_osv_parse" / "synthetic" / "s01_variant2_header.json").is_file()
    monkeypatch.setenv("ARM_KA_FIXTURES", str(root / "нет"))
    capsys.readouterr()
    assert golden_update.main([]) == golden_update.EXIT_NO_FIXTURES
    assert "каталог фикстур не найден" in capsys.readouterr().err