import hashlib
import json
import unittest
from pathlib import Path

import generate_hal_s2_report

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


class HalS2ReportTests(unittest.TestCase):
    def test_report_contract(self):
        report = json.loads((ROOT / "coverage/hal-s2.report.json").read_text(encoding="utf-8"))
        self.assertEqual(report["schema"], "hal-s2-report.v1")
        self.assertEqual(report["task_id"], "S2-02")
        self.assertEqual(report["status"], "verified")
        self.assertTrue(report["tests"]["native_wasm_byte_identical"])
        self.assertEqual(report["capacity"]["pins"], 256)

    def test_report_self_hash(self):
        report = json.loads((ROOT / "coverage/hal-s2.report.json").read_text(encoding="utf-8"))
        unsigned = {key: value for key, value in report.items() if key != "report_sha256"}
        canonical = json.dumps(unsigned, ensure_ascii=False, sort_keys=True, separators=(",", ":")).encode()
        self.assertEqual(report["report_sha256"], hashlib.sha256(canonical).hexdigest())

    def test_report_is_deterministic(self):
        first = ROOT / "coverage/.hal-s2-one.json"
        second = ROOT / "coverage/.hal-s2-two.json"
        try:
            self.assertEqual(generate_hal_s2_report.generate(first), generate_hal_s2_report.generate(second))
        finally:
            first.unlink(missing_ok=True)
            second.unlink(missing_ok=True)


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