#!/usr/bin/env python3
import hashlib
import json
import sys
import unittest
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parent))
from generate_sim_contract_report import OUTPUT, generate


ROOT = Path(__file__).resolve().parents[1]


def report_digest(report):
    unsigned = {key: value for key, value in report.items() if key != "report_sha256"}
    payload = json.dumps(unsigned, ensure_ascii=False, sort_keys=True, separators=(",", ":")).encode("utf-8")
    return hashlib.sha256(payload).hexdigest()


class SimContractTests(unittest.TestCase):
    def test_report_contract(self):
        report = json.loads((ROOT / OUTPUT).read_text(encoding="utf-8"))
        self.assertEqual(report["schema"], "sim-contract-report.v1")
        self.assertEqual(report["task_id"], "P0-03")
        self.assertEqual(report["implementation_status"], "verified")
        self.assertEqual(report["release_action"], "STOP_RELEASE")
        self.assertEqual(report["report_sha256"], report_digest(report))
        self.assertTrue(all(value["status"] == "passed" and value["byte_identical"] for value in report["tests"].values()))

    def test_generation_is_deterministic(self):
        before = (ROOT / OUTPUT).read_bytes()
        report = generate(ROOT, ROOT / OUTPUT)
        self.assertEqual(before, (ROOT / OUTPUT).read_bytes())
        self.assertEqual(report["report_sha256"], json.loads(before)["report_sha256"])


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