"""Verify the teacher gateway is reachable and returns text.

    python scripts/check_teacher.py                 # default: promptlens
    python scripts/check_teacher.py --teacher openai

Loads .env, sends a 1-line prompt, prints the reply. Exits non-zero on failure.
"""
import argparse
import sys
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parents[1] / "src"))

from mathcompose.teachers import get_teacher  # noqa: E402


def main() -> int:
    ap = argparse.ArgumentParser()
    ap.add_argument("--teacher", default="promptlens")
    ap.add_argument("--model", default=None)
    ap.add_argument("--prompt", default="Reply with exactly: pong")
    args = ap.parse_args()

    try:
        teacher = get_teacher(args.teacher, **({"model": args.model} if args.model else {}))
    except Exception as e:
        print(f"[FAIL] could not build teacher '{args.teacher}': {e}")
        return 1

    who = f"{args.teacher} (model={getattr(teacher, 'model', '?')}, base_url={getattr(teacher, 'base_url', None)})"
    print(f"calling {who} ...")
    try:
        reply = teacher.complete(
            [{"role": "user", "content": args.prompt}], temperature=0.0, max_tokens=32
        )
    except Exception as e:
        print(f"[FAIL] teacher call errored: {type(e).__name__}: {e}")
        return 1

    print(f"[OK] reply: {reply!r}")
    return 0


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