#!/usr/bin/env python3
"""Generate deterministic S2-03 encoder/coolant/interlock/ack evidence."""

from __future__ import annotations

import hashlib
import json
import subprocess
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]
OUTPUT = ROOT / "coverage/device-io-s2.report.json"

INPUTS = (
    "context-lock.json",
    "wasm-core/include/sim_device_io.h",
    "wasm-core/src/sim_device_io.c",
    "wasm-core/tests/sim_device_io_test.c",
    "web/worker/device-io.mjs",
    "web/worker/test_device_io.mjs",
    "web/worker/io-ack.mjs",
    "web/worker/sim-session.mjs",
    "linuxcnc/src/hal/components/sim_encoder.c",
    "linuxcnc/src/hal/components/encoder.c",
    "linuxcnc/configs/sim/axis/cooling.hal",
)


def sha256_bytes(data: bytes) -> str:
    return hashlib.sha256(data).hexdigest()


def canonical(value: object) -> bytes:
    return json.dumps(value, ensure_ascii=False, sort_keys=True, separators=(",", ":")).encode("utf-8")


def run(command: list[str]) -> dict[str, object]:
    completed = subprocess.run(command, cwd=ROOT, text=True, capture_output=True, check=False)
    sample = None
    for line in reversed(completed.stdout.splitlines()):
        if line.lstrip().startswith("{"):
            try:
                sample = json.loads(line)
                break
            except json.JSONDecodeError:
                continue
    return {
        "command": command,
        "returncode": completed.returncode,
        "status": "verified" if completed.returncode == 0 else "blocked",
        "stdout_sha256": sha256_bytes(completed.stdout.encode()),
        "stderr_sha256": sha256_bytes(completed.stderr.encode()),
        "sample": sample,
    }


def generate(output: Path = OUTPUT) -> dict[str, object]:
    context = json.loads((ROOT / "context-lock.json").read_text(encoding="utf-8"))
    native = run([str(ROOT / "build-native/sim_device_io_test")])
    wasm = run(["node", str(ROOT / "build-wasm/sim_device_io_wasm_test.js")])
    worker = run(["node", str(ROOT / "web/worker/test_device_io.mjs")])
    native_sample = native["sample"]
    wasm_sample = wasm["sample"]
    report: dict[str, object] = {
        "schema": "device-io-s2-report.v1",
        "task_id": "S2-03",
        "context_id": context["context_id"],
        "status": "verified" if all(item["status"] == "verified" for item in (native, wasm, worker)) and native_sample == wasm_sample else "blocked",
        "features": [
            "fixed-tick quadrature encoder and index pulse",
            "encoder position/velocity/count scaling",
            "coolant mist/flood/lube interlock gating",
            "door and latched interlock fault/recovery",
            "deterministic IO ack issue/duplicate/timeout/late/abort",
            "native/WASM byte-identical state sample",
            "Worker checkpoint/replay device state",
        ],
        "capacities": {"encoders": 8, "ack_entries": 64, "max_tick_step": 1000000},
        "boundaries": ["real encoder transport and physical safety circuits remain REAL-EXCLUDED", "nonfinite/range/unsafe commands fail closed"],
        "inputs": [{"path": path, "sha256": sha256_bytes((ROOT / path).read_bytes())} for path in INPUTS],
        "tests": {"native": native, "wasm": wasm, "worker": worker, "native_wasm_byte_identical": native_sample == wasm_sample},
        "report_sha256": None,
    }
    report["report_sha256"] = sha256_bytes(canonical({key: value for key, value in report.items() if key != "report_sha256"}))
    output.parent.mkdir(parents=True, exist_ok=True)
    output.write_text(json.dumps(report, ensure_ascii=False, sort_keys=True, indent=2) + "\n", encoding="utf-8")
    return report


if __name__ == "__main__":
    result = generate()
    print(f"device_io_s2={result['status']} native_wasm={result['tests']['native_wasm_byte_identical']}")