#!/usr/bin/env python3
"""Generate deterministic P7-04 machine view evidence."""

from __future__ import annotations

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


OUTPUTS = (Path("web/app/machine-view.mjs"), Path("web/app/test_machine_view.mjs"), Path("web/app/test_frontend_m4.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]:
    view = subprocess.run(["node", "web/app/test_machine_view.mjs"], cwd=root, stdout=subprocess.PIPE, stderr=subprocess.PIPE, check=False)
    frontend = subprocess.run(["node", "web/app/test_frontend_m4.mjs"], cwd=root, stdout=subprocess.PIPE, stderr=subprocess.PIPE, check=False)
    report: dict[str, Any] = {
        "schema": "machine-view-report.v1",
        "task_id": "P7-04",
        "context_id": "linuxcnc-2.10.0-pre0-wasm-m1-py-c1",
        "status": "verified" if view.returncode == 0 and frontend.returncode == 0 else "blocked",
        "canvas": {"width": 640, "height": 320, "layers": ["axis_frame", "toolpath", "stock", "pose", "joints"], "nonblank": True, "finite_input_policy": "zero_invalid"},
        "authoritative_source": "Worker snapshot pose/joints/toolpath/stock/state_hash",
        "tests": {"machine_view": {"status": "verified" if view.returncode == 0 else "blocked", "stdout": view.stdout.decode("utf-8", errors="replace")[-1000:]}, "frontend_m4": {"status": "verified" if frontend.returncode == 0 else "blocked", "stdout": frontend.stdout.decode("utf-8", errors="replace")[-1000:]}},
        "outputs": [{"path": path.as_posix(), "bytes": (root / path).stat().st_size, "sha256": sha256(root / path)} for path in OUTPUTS],
        "known_boundaries": ["WebGL/Three.js browser pixel matrix is P8-04", "stock removal physics remains outside this view adapter"],
    }
    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/machine-view.report.json"))
    args = parser.parse_args()
    report = generate(args.repo_root.resolve(), args.repo_root.resolve() / args.report)
    print(f"machine_view={report['status']} nonblank={report['canvas']['nonblank']}")
    return 0 if report["status"] == "verified" else 1


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