#!/usr/bin/env python3
"""Generate deterministic P6-03 migration/offline/rollback evidence."""

from __future__ import annotations

import argparse
import hashlib
import json
import subprocess
from pathlib import Path
from typing import Any


OUTPUTS = (Path("web/workspace/migration.mjs"), Path("web/workspace/recovery.mjs"), Path("web/workspace/journal.mjs"), Path("web/workspace/test_migration.mjs"), Path("coverage/workspace-migration.report.json"), Path("coverage/workspace-rollback.package.json"), Path("coverage/offline-cache.package.json"))
TESTS = (("migration", ["node", "web/workspace/test_migration.mjs"]), ("fault_matrix", ["node", "web/worker/test_recovery_offline_faults.mjs"]))


def canonical(value: Any) -> str:
    return json.dumps(value, ensure_ascii=False, sort_keys=True, separators=(",", ":"))


def sha256(path: Path) -> str:
    return hashlib.sha256(path.read_bytes()).hexdigest()


def run(root: Path, command: list[str]) -> dict[str, Any]:
    result = subprocess.run(command, cwd=root, stdout=subprocess.PIPE, stderr=subprocess.PIPE, check=False)
    return {"status": "verified" if result.returncode == 0 else "blocked", "command": " ".join(command), "returncode": result.returncode, "stdout": result.stdout.decode("utf-8", errors="replace")[-2500:], "stderr": result.stderr.decode("utf-8", errors="replace")[-2000:]}


def generate(root: Path, report_path: Path) -> dict[str, Any]:
    tests = {name: run(root, command) for name, command in TESTS}
    report: dict[str, Any] = {
        "schema": "offline-migration-report.v1",
        "task_id": "P6-03",
        "context_id": "linuxcnc-2.10.0-pre0-wasm-m1-py-c1",
        "status": "verified" if all(item["status"] == "verified" for item in tests.values()) else "blocked",
        "packages": {"workspace_versions": [1, 2], "migration_lossless": True, "rollback_schema": "workspace-rollback.v1", "offline_schema": "offline-cache-package.v1"},
        "boundaries": ["package_hash", "content_hash", "migration_round_trip", "rollback_target", "rollback_failure", "offline_missing", "offline_corrupted", "online_degraded", "context_mismatch"],
        "tests": tests,
        "outputs": [{"path": path.as_posix(), "bytes": (root / path).stat().st_size, "sha256": sha256(root / path)} for path in OUTPUTS],
        "oracle": {"status": "blocked", "reason": "official browser OPFS migration/offline oracle is absent from locked source"},
        "known_boundaries": ["Service Worker/browser matrix is P8-04", "release owner/browser/real device gates remain blocked"],
    }
    report["report_sha256"] = hashlib.sha256(canonical(report).encode("utf-8")).hexdigest()
    report_path.parent.mkdir(parents=True, exist_ok=True)
    report_path.write_text(json.dumps(report, ensure_ascii=False, sort_keys=True, indent=2) + "\n", encoding="utf-8")
    return report


def main() -> int:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--repo-root", type=Path, default=Path(__file__).resolve().parents[1])
    parser.add_argument("--report", type=Path, default=Path("coverage/offline-migration.report.json"))
    args = parser.parse_args()
    report = generate(args.repo_root.resolve(), args.repo_root.resolve() / args.report)
    print(f"offline_migration={report['status']} tests={len(report['tests'])} oracle={report['oracle']['status']}")
    return 0 if report["status"] == "verified" else 1


if __name__ == "__main__":
    raise SystemExit(main())