#!/usr/bin/env python3
"""Generate deterministic canonical queue/TP blend evidence for P3-03."""

from __future__ import annotations

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


OUTPUTS = (
    Path("wasm-core/include/sim_motion_queue.h"),
    Path("wasm-core/src/sim_motion_queue.c"),
    Path("wasm-core/tests/sim_motion_queue_test.c"),
)


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


def sha256(path: Path) -> str:
    digest = hashlib.sha256()
    with path.open("rb") as handle:
        for chunk in iter(lambda: handle.read(1024 * 1024), b""):
            digest.update(chunk)
    return digest.hexdigest()


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


def generate(root: Path, report_path: Path) -> dict[str, Any]:
    native = command(root, [str(root / "build-native/sim_motion_queue_test")])
    wasm_binary = root / "build-wasm/sim_motion_queue_wasm_test.js"
    wasm = command(root, ["node", "build-wasm/sim_motion_queue_wasm_test.js"]) if wasm_binary.is_file() else {"status": "blocked", "command": "node build-wasm/sim_motion_queue_wasm_test.js", "reason": "wasm_test_missing"}
    outputs = [{"path": path.as_posix(), "bytes": (root / path).stat().st_size, "sha256": sha256(root / path)} for path in OUTPUTS]
    report: dict[str, Any] = {
        "schema": "tp-blend-report.v1",
        "task_id": "P3-03",
        "context_id": "linuxcnc-2.10.0-pre0-wasm-m1-py-c1",
        "status": "verified" if native["status"] == "verified" and wasm["status"] == "verified" else "blocked",
        "profiles": {"blend": {"lookahead": "bounded min velocity over queued segments", "junction": "deterministic velocity carry"}, "exact_stop": {"lookahead": "disabled at junction", "junction": "zero velocity"}},
        "queue": {"capacity": 64, "peek": True, "segment_order": "FIFO", "plan_hash": "fnv1a64 profile/lookahead/queued planned velocities"},
        "determinism": {"fixed_tick": True, "wall_clock": False, "random": False, "native_wasm_state_hash": True},
        "outputs": outputs,
        "native": native,
        "wasm": wasm,
        "known_boundaries": ["full kinematics IK/motion adapter is P3-05/P3-06", "official LinuxCNC TP oracle remains source-gated"],
    }
    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/tp-blend.report.json"))
    args = parser.parse_args()
    report = generate(args.repo_root.resolve(), args.repo_root.resolve() / args.report)
    print(f"tp_blend={report['status']} native={report['native']['status']} wasm={report['wasm']['status']}")
    return 0 if report["status"] == "verified" else 1


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