"""Guard cache invalidation against stale documents and needless metadata rebuilds."""
from pathlib import Path
import subprocess
import tempfile
import unittest
from unittest.mock import patch
import ci


class FingerprintTests(unittest.TestCase):
    def test_build_inputs_invalidate_but_metadata_and_caches_do_not(self):
        with tempfile.TemporaryDirectory() as directory:
            root = Path(directory)
            subprocess.run(["git", "init", "-q", str(root)], check=True)
            (root / ".gitignore").write_text(".artifacts/\n**/.next/\n")
            doc = root / "content/docs/concept.md"
            doc.parent.mkdir(parents=True)
            doc.write_text("# Original\n")
            package = root / "package.json"
            package.write_text('{"private":true}\n')
            with patch.object(ci, "ROOT", root):
                original = ci.fingerprint()
                (root / "README.md").write_text("metadata only\n")
                cache = root / "apps/docs/.next/cache/state"
                cache.parent.mkdir(parents=True)
                cache.write_text("compiler cache\n")
                deploy = root / "scripts/deploy.py"
                deploy.parent.mkdir(parents=True)
                deploy.write_text("# deployment-only configuration\n")
                self.assertEqual(original, ci.fingerprint())
                doc.write_text("# Updated\n")
                self.assertNotEqual(original, ci.fingerprint())
                doc.write_text("# Original\n")
                package.write_text('{"private":true,"version":"2"}\n')
                self.assertNotEqual(original, ci.fingerprint())
                package.write_text('{"private":true}\n')
                doc.rename(doc.with_name("renamed.md"))
                self.assertNotEqual(original, ci.fingerprint())


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