"""Offline regression checks for release-maintenance failure handling."""
import json
import tempfile
import unittest
from pathlib import Path
from unittest.mock import patch

import dependency_notices as notices


class NoticeTests(unittest.TestCase):
    def setUp(self):
        self.temp = tempfile.TemporaryDirectory()
        self.addCleanup(self.temp.cleanup)
        self.root = Path(self.temp.name)
        (self.root / "tools").mkdir()
        (self.root / "package").mkdir()
        (self.root / "tools/license_supplements.json").write_text("{}")
        self.metadata = json.dumps({"workspace_members": [], "packages": [{
            "id": "example", "name": "example", "version": "1.0.0", "license": "MIT",
            "manifest_path": str(self.root / "package/Cargo.toml"),
        }]}).encode()
        self.patch = patch.object(notices, "ROOT", self.root)
        self.patch.start()
        self.addCleanup(self.patch.stop)

    def test_missing_license_fails(self):
        with patch.object(notices.subprocess, "check_output", return_value=self.metadata):
            with self.assertRaisesRegex(RuntimeError, "Missing license"):
                notices.generate()

    def test_license_text_is_preserved(self):
        original = "Copyright Example  \n\nMIT license text\n"
        (self.root / "package/LICENSE").write_text(original)
        with patch.object(notices.subprocess, "check_output", return_value=self.metadata):
            outputs = notices.generate()
        self.assertIn(original, outputs[self.root / "docs/third-party-licenses.txt"])
        self.assertFalse((self.root / "THIRD_PARTY_NOTICES.md").exists())

    def test_supplement_checksum_mismatch_fails(self):
        (self.root / "tools/license_supplements.json").write_text(json.dumps({
            "example@1.0.0": {"url": "https://example.invalid/LICENSE", "sha256": "0" * 64}
        }))
        with patch.object(notices.subprocess, "check_output", side_effect=[self.metadata, b"bad"]):
            with self.assertRaisesRegex(RuntimeError, "checksum mismatch"):
                notices.generate()

    def test_check_does_not_overwrite_outdated_file(self):
        path = self.root / "THIRD_PARTY_NOTICES.md"
        path.write_text("old")
        with patch.object(notices, "generate", return_value={path: "new"}):
            with patch("sys.argv", ["dependency_notices.py", "--check"]):
                with self.assertRaisesRegex(SystemExit, "Outdated notices"):
                    notices.main()
        self.assertEqual(path.read_text(), "old")


if __name__ == "__main__":
    unittest.main()