import copy
import os

import pytest

from viano_bug_analysis.package import PackageFactory, PackageReader, PackageWriteError


def test_generic_factory(manifest, tmp_path):
    original = copy.deepcopy(manifest)
    path = tmp_path / "first.package"
    assert PackageFactory().create(path, manifest, {"unknown": b"opaque"}).valid
    assert manifest == original
    with PackageReader(path) as reader:
        assert reader.manifest["package_generation"] == 0
        assert reader.read_bytes("unknown") == b"opaque"


@pytest.mark.parametrize("artifacts", [{"../escape": b"x"}, {"manifest.json": b"x"}, {"a": b"x", "A": b"y"}, {"a": b"x", "a/b": b"y"}, {"a": "not bytes"}])
def test_invalid_creation_keeps_target_absent(manifest, tmp_path, artifacts):
    target = tmp_path / "out"
    with pytest.raises(PackageWriteError):
        PackageFactory().create(target, manifest, artifacts)
    assert not target.exists()
    assert not list(tmp_path.glob(".vbcase-*.tmp"))


def test_factory_failure_preserves_existing_target(manifest, tmp_path):
    target = tmp_path / "out"
    target.write_bytes(b"previous")
    with pytest.raises(PackageWriteError):
        PackageFactory().create(target, manifest, {})
    assert target.read_bytes() == b"previous"


def test_factory_fsync_failure(manifest, tmp_path, monkeypatch):
    target = tmp_path / "out"
    def fail(*args):
        raise OSError("disk error")
    monkeypatch.setattr(os, "fsync", fail)
    with pytest.raises(PackageWriteError):
        PackageFactory().create(target, manifest, {})
    assert not target.exists()
    assert not list(tmp_path.glob(".vbcase-*.tmp"))