#!/usr/bin/env python3
"""Contract tests for S7-03 authoritative linear Delta 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_authoritative_kinematics_s7_03


ROOT = Path(__file__).resolve().parents[1]
REPORT = ROOT / "coverage/authoritative-kinematics-s7-03.report.json"


class AuthoritativeKinematicsS703Tests(unittest.TestCase):
    def test_contract(self) -> None:
        report = json.loads(REPORT.read_text(encoding="utf-8"))
        self.assertEqual(report["schema"], "authoritative-kinematics-s7-03.v1")
        self.assertEqual(report["task_id"], "S7-03")
        self.assertEqual(report["status"], "verified")
        self.assertEqual(report["scope"]["selected_family"], "parallel_linear_delta")
        self.assertTrue(all(item["golden_diff"]["byte_identical"] for item in report["native_wasm"].values()))
        self.assertTrue(report["worker"]["sample"]["parity"]["mode"]["equal"])
        self.assertTrue(report["worker"]["sample"]["parity"]["recovery"]["equal"])
        self.assertEqual(report["worker"]["sample"]["range"]["message_key"], "authoritative_kinematics_range")
        self.assertIn("TRT", report["selection"]["not_promoted"])

    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_authoritative_kinematics_s7_03.canonical(unsigned).encode()).hexdigest())

    def test_deterministic(self) -> None:
        with tempfile.TemporaryDirectory() as directory:
            first = generate_authoritative_kinematics_s7_03.generate(ROOT, Path(directory) / "one.json"); second = generate_authoritative_kinematics_s7_03.generate(ROOT, Path(directory) / "two.json"); self.assertEqual(first, second)


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