#!/usr/bin/env python3
"""Contract tests for the S7 LinuxCNC simulation alignment ledger."""

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_simulation_alignment_audit_s7


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


class SimulationAlignmentS7Tests(unittest.TestCase):
    def test_contract(self) -> None:
        report = json.loads(REPORT.read_text(encoding="utf-8"))
        self.assertEqual(report["schema"], "linuxcnc-simulation-alignment-s7.v1")
        self.assertEqual(report["task_id"], "S7-AUDIT")
        self.assertEqual(report["status"], "verified")
        self.assertEqual(report["next_execution"]["task_id"], "S7-01")
        self.assertEqual(report["next_execution"]["status"], "queued")
        self.assertTrue(any(item["gap_id"] == "ALIGN-SOURCE-DO-ENDDO" for item in report["gaps"]))
        self.assertTrue(any(item["gap_id"] == "ALIGN-OFFICIAL-ORACLE" for item in report["gaps"]))
        self.assertEqual(report["scope"]["excluded_browser_scope"], ["Safari", "Firefox"])

    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_simulation_alignment_audit_s7.canonical(unsigned).encode()).hexdigest())

    def test_deterministic(self) -> None:
        with tempfile.TemporaryDirectory() as directory:
            first = generate_simulation_alignment_audit_s7.generate(ROOT, Path(directory) / "one.json")
            second = generate_simulation_alignment_audit_s7.generate(ROOT, Path(directory) / "two.json")
            self.assertEqual(first, second)


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