#!/usr/bin/env python3
"""Generate deterministic P4-03 PLC/ClassicLadder runtime 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/plc-runtime.mjs"), Path("web/worker/sim-session.mjs"), Path("web/worker/test_plc_runtime.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_plc_runtime.mjs"], cwd=root, stdout=subprocess.PIPE, stderr=subprocess.PIPE, check=False)
    report: dict[str, Any] = {
        "schema": "plc-runtime-report.v1",
        "task_id": "P4-03",
        "context_id": "linuxcnc-2.10.0-pre0-wasm-m1-py-c1",
        "status": "verified" if result.returncode == 0 else "blocked",
        "runtime": {"max_rungs": 256, "max_registers": 256, "max_sample_capacity": 1024, "scan_order": "configuration order", "fixed_tick": True},
        "operations": ["SET", "ADD", "AND", "OR", "NOT", "TIMER", "COUNTER"],
        "backpressure": ["drop_newest", "drop_oldest", "block"],
        "boundaries": ["rung_capacity", "register_capacity", "sample_capacity", "tick_regression", "nonfinite", "unsupported_rung", "backpressure"],
        "test": {"status": "verified" if result.returncode == 0 else "blocked", "command": "node web/worker/test_plc_runtime.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],
        "classicladder": {"status": "capability_boundary", "resource": "linuxcnc/src/hal/classicladder", "unsupported_host_features": "blocked"},
        "known_boundaries": ["full ClassicLadder XML/GUI editor is outside Worker core", "real device transport remains REAL-EXCLUDED"],
    }
    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/plc-runtime.report.json"))
    args = parser.parse_args()
    report = generate(args.repo_root.resolve(), args.repo_root.resolve() / args.report)
    print(f"plc_runtime={report['status']} test={report['test']['status']}")
    return 0 if report["status"] == "verified" else 1


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