#!/usr/bin/env python3
"""Contract tests for S7-02 G64/G61 evidence."""

from __future__ import annotations

import hashlib
import json
import sys
import tempfile
import unittest
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parent))
import generate_source_g6164_s7_02


ROOT = Path(__file__).resolve().parents[1]
REPORT = ROOT / "coverage/source-g6164-s7-02.report.json"


class SourceG6164S702Tests(unittest.TestCase):
    def test_contract(self) -> None:
        report = json.loads(REPORT.read_text(encoding="utf-8"))
        self.assertEqual(report["schema"], "linuxcnc-source-g6164-s7-02-report.v1")
        self.assertEqual(report["task_id"], "S7-02")
        self.assertEqual(report["status"], "verified")
        self.assertEqual(report["checks"]["modal_sequence"]["status"], "verified")
        self.assertEqual(report["checks"]["tolerance_mapping"]["status"], "verified")
        self.assertEqual(report["checks"]["recovery"]["first_difference"], None)
        self.assertEqual(report["checks"]["source_expected_comparison"]["status"], "SOURCE_BLOCKED")

    def test_self_hash(self) -> None:
        report = json.loads(REPORT.read_text(encoding="utf-8"))
        unsigned = {key: value for key, value in report.items() if key != "report_sha256"}
        self.assertEqual(report["report_sha256"], hashlib.sha256(generate_source_g6164_s7_02.canonical(unsigned).encode()).hexdigest())

    def test_deterministic(self) -> None:
        with tempfile.TemporaryDirectory() as directory:
            first = generate_source_g6164_s7_02.generate(ROOT, Path(directory) / "one.json")
            second = generate_source_g6164_s7_02.generate(ROOT, Path(directory) / "two.json")
            self.assertEqual(first, second)


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