#!/usr/bin/env python3
"""
Evaluate the final local readiness gate before an external NeMo runner is used.

This command is read-only and local. It does not call NIM, NVIDIA APIs,
production tools, or LLMs.
"""

from __future__ import annotations

import argparse
import json
import sys
from pathlib import Path
from typing import Any


ROOT = Path(__file__).resolve().parents[2]
API_SRC = ROOT / "apps" / "api"
sys.path.insert(0, str(API_SRC))

from src.services.agent_nemotron_external_runner_readiness import (  # noqa: E402
    DEFAULT_MINIMUM_RECORDS,
    evaluate_nemotron_external_runner_readiness,
)


def main() -> int:
    parser = argparse.ArgumentParser(
        description="Evaluate NeMo/Nemotron external runner readiness."
    )
    parser.add_argument("--manifest", required=True, help="external runner manifest JSON")
    parser.add_argument("--sanitize-report", required=True, help="sanitize report JSON")
    parser.add_argument(
        "--sanitized-preflight",
        required=True,
        help="sanitized external runner preflight report JSON",
    )
    parser.add_argument(
        "--minimum-records",
        type=int,
        default=DEFAULT_MINIMUM_RECORDS,
        help="minimum request records required before readiness can pass",
    )
    parser.add_argument("--output", help="readiness report JSON")
    args = parser.parse_args()

    report = evaluate_nemotron_external_runner_readiness(
        manifest=_read_json(Path(args.manifest)),
        sanitize_report=_read_json(Path(args.sanitize_report)),
        sanitized_preflight=_read_json(Path(args.sanitized_preflight)),
        minimum_records=args.minimum_records,
    ).to_dict()
    rendered = json.dumps(report, ensure_ascii=False, indent=2, sort_keys=True)
    if args.output:
        Path(args.output).write_text(rendered + "\n", encoding="utf-8")
    else:
        print(rendered)
    return 0 if report["ready"] else 2


def _read_json(path: Path) -> dict[str, Any]:
    try:
        payload = json.loads(path.read_text(encoding="utf-8"))
    except Exception as exc:
        raise SystemExit(f"{path}: invalid JSON: {exc}") from exc
    if not isinstance(payload, dict):
        raise SystemExit(f"{path}: expected JSON object")
    return payload


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