#!/usr/bin/env python3
"""Generate deterministic P6-01 full snapshot/event/trace evidence."""

from __future__ import annotations

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


OUTPUTS = (Path("web/worker/trace-export.mjs"), Path("web/worker/sim-session.mjs"), Path("web/worker/test_trace_export.mjs"), Path("web/worker/replay.mjs"), Path("web/worker/contracts.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 generate(root: Path, report_path: Path) -> dict[str, Any]:
    result = subprocess.run(["node", "web/worker/test_trace_export.mjs"], cwd=root, stdout=subprocess.PIPE, stderr=subprocess.PIPE, check=False)
    report: dict[str, Any] = {
        "schema": "trace-export-report.v1",
        "task_id": "P6-01",
        "context_id": "linuxcnc-2.10.0-pre0-wasm-m1-py-c1",
        "status": "verified" if result.returncode == 0 else "blocked",
        "trace": {"schema": "simulation-trace.v1", "fields": ["context_id", "seq", "tick", "state", "state_hash", "task", "timeline", "event_hash", "snapshot_hash", "trace_hash"], "subsystems": ["task", "scheduler", "program", "motion", "plc", "io_ack", "callbacks", "devices", "python", "workspace"]},
        "validation": ["event sequence", "event tick monotonic", "payload hash", "snapshot hash/id/base", "state hash", "context", "trace hash", "nonfinite rejection"],
        "test": {"status": "verified" if result.returncode == 0 else "blocked", "command": "node web/worker/test_trace_export.mjs", "stdout": result.stdout.decode("utf-8", errors="replace")[-3000:], "stderr": result.stderr.decode("utf-8", errors="replace")[-2000:]},
        "outputs": [{"path": path.as_posix(), "bytes": (root / path).stat().st_size, "sha256": sha256(root / path)} for path in OUTPUTS],
        "known_boundaries": ["journal/checkpoint reconciliation is P6-02", "OPFS migration/offline package is P6-03"],
    }
    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/trace-export.report.json"))
    args = parser.parse_args()
    report = generate(args.repo_root.resolve(), args.repo_root.resolve() / args.report)
    print(f"trace_export={report['status']} test={report['test']['status']}")
    return 0 if report["status"] == "verified" else 1


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