#!/usr/bin/env python3
"""
Run an approved NeMo/Nemotron request pack through NVIDIA NIM offline replay.

This command reads a sanitized request JSONL, calls only the configured chat
completion endpoint, and writes agent_nemotron_external_result_v1 JSONL. It
does not execute tools, mutate production systems, or read fixture labels.
"""

from __future__ import annotations

import argparse
import asyncio
import json
import os
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 import (  # noqa: E402
    DEFAULT_CONCURRENCY,
    DEFAULT_MAX_TOKENS,
    DEFAULT_NEMOTRON_MODEL,
    DEFAULT_NVIDIA_CHAT_COMPLETIONS_URL,
    DEFAULT_TIMEOUT_SECONDS,
    NemotronExternalRunnerConfig,
    run_nemotron_external_replay,
)


async def main_async() -> int:
    parser = argparse.ArgumentParser(
        description="Run NeMo/Nemotron external offline replay."
    )
    parser.add_argument("--requests", required=True, help="sanitized NeMo request JSONL")
    parser.add_argument("--output", required=True, help="external result JSONL")
    parser.add_argument("--report", required=True, help="runner report JSON")
    parser.add_argument("--readiness", help="readiness report JSON; must be ready=true")
    parser.add_argument(
        "--api-key-env",
        default="NVIDIA_API_KEY",
        help="environment variable holding the NVIDIA/NIM API key",
    )
    parser.add_argument(
        "--base-url",
        default=os.getenv("NVIDIA_API_BASE_URL")
        or os.getenv("NIM_BASE_URL")
        or DEFAULT_NVIDIA_CHAT_COMPLETIONS_URL,
        help="chat completions endpoint",
    )
    parser.add_argument(
        "--model",
        default=os.getenv("NEMOTRON_TOOL_MODEL") or DEFAULT_NEMOTRON_MODEL,
        help="NVIDIA/Nemotron model name",
    )
    parser.add_argument(
        "--timeout-seconds",
        type=float,
        default=float(os.getenv("NEMOTRON_TIMEOUT_SECONDS") or DEFAULT_TIMEOUT_SECONDS),
    )
    parser.add_argument("--max-tokens", type=int, default=DEFAULT_MAX_TOKENS)
    parser.add_argument("--temperature", type=float, default=0.0)
    parser.add_argument("--concurrency", type=int, default=DEFAULT_CONCURRENCY)
    parser.add_argument("--max-records", type=int, help="optional local smoke limit")
    args = parser.parse_args()

    readiness = _read_json(Path(args.readiness)) if args.readiness else None
    if readiness is not None and readiness.get("ready") is not True:
        report = {
            "schema_version": "agent_nemotron_external_runner_report_v1",
            "candidate_id": "nemo_nemotron_fabric",
            "requests": 0,
            "results": 0,
            "valid": False,
            "model": args.model,
            "failures": ["readiness_not_ready"],
        }
        _write_json(Path(args.report), report)
        return 2

    api_key = os.getenv(args.api_key_env, "")
    requests = _read_jsonl(Path(args.requests))
    if args.max_records is not None:
        requests = requests[: args.max_records]
    results, report = await run_nemotron_external_replay(
        requests=requests,
        config=NemotronExternalRunnerConfig(
            api_key=api_key,
            base_url=args.base_url,
            model=args.model,
            timeout_seconds=args.timeout_seconds,
            max_tokens=args.max_tokens,
            temperature=args.temperature,
            concurrency=args.concurrency,
        ),
    )
    _write_jsonl(Path(args.output), results)
    _write_json(Path(args.report), report.to_dict())
    print(json.dumps(report.to_dict(), ensure_ascii=False, sort_keys=True))
    return 0 if report.valid 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


def _read_jsonl(path: Path) -> list[dict[str, Any]]:
    records: list[dict[str, Any]] = []
    with path.open(encoding="utf-8") as handle:
        for line_number, line in enumerate(handle, start=1):
            line = line.strip()
            if not line or line.startswith("#"):
                continue
            try:
                payload = json.loads(line)
            except Exception as exc:
                raise SystemExit(f"{path}:{line_number}: invalid JSONL: {exc}") from exc
            if not isinstance(payload, dict):
                raise SystemExit(f"{path}:{line_number}: expected JSON object")
            records.append(payload)
    return records


def _write_jsonl(path: Path, records: list[dict[str, Any]]) -> None:
    with path.open("w", encoding="utf-8") as handle:
        for record in records:
            handle.write(json.dumps(record, ensure_ascii=False, sort_keys=True))
            handle.write("\n")


def _write_json(path: Path, payload: dict[str, Any]) -> None:
    path.write_text(
        json.dumps(payload, ensure_ascii=False, indent=2, sort_keys=True) + "\n",
        encoding="utf-8",
    )


def main() -> int:
    return asyncio.run(main_async())


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