import json
import tempfile
import unittest
from pathlib import Path

from tools.export_mock_parity import verify_report, write_report


class MockParityReportTests(unittest.TestCase):
    def test_report_is_deterministic_and_explicitly_not_platform_evidence(self):
        with tempfile.TemporaryDirectory() as directory:
            first = Path(directory) / "first.json"
            second = Path(directory) / "second.json"
            report = write_report(first)
            write_report(second)
            self.assertEqual(first.read_bytes(), second.read_bytes())
            self.assertTrue(report["comparisons"]["whole_plan_exact"])
            self.assertEqual(report["evidence_class"], "mock_contract_only")
            self.assertFalse(report["real_platform_pass"])
            self.assertEqual(report["gate_credit"], [])
            self.assertTrue(verify_report(first)["ok"])

    def test_tampering_is_rejected(self):
        with tempfile.TemporaryDirectory() as directory:
            path = Path(directory) / "report.json"
            write_report(path)
            report = json.loads(path.read_text(encoding="utf-8"))
            report["comparisons"]["whole_plan_exact"] = False
            path.write_text(json.dumps(report), encoding="utf-8")
            with self.assertRaisesRegex(ValueError, "hash mismatch"):
                verify_report(path)


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