"""CLI: python -m deep_research --backend {codex|antigravity} "<질문>" [--json]"""
import argparse
import asyncio
import shutil
import sys
from deep_research.config import DEFAULT
from deep_research.pipeline import run_research
from deep_research.report import to_markdown, to_json


def _make_backend(name: str):
    if name == "codex":
        if shutil.which("codex") is None:
            sys.exit("error: `codex` CLI not found on PATH. Install + login (subscription).")
        from deep_research.backends.codex import CodexBackend
        return CodexBackend()
    if name == "antigravity":
        if shutil.which("agy") is None:
            sys.exit("error: `agy` CLI not found on PATH. Install + login (subscription).")
        from deep_research.backends.antigravity import AntigravityBackend
        return AntigravityBackend(retries=DEFAULT.ANTIGRAVITY_RETRIES)
    sys.exit(f"error: unknown backend '{name}'")


def main(argv=None):
    ap = argparse.ArgumentParser(prog="deep-research")
    ap.add_argument("question")
    ap.add_argument("--backend", required=True, choices=["codex", "antigravity"])
    ap.add_argument("--json", action="store_true", help="emit raw JSON instead of markdown")
    ap.add_argument("--concurrency", type=int, default=DEFAULT.CONCURRENCY)
    args = ap.parse_args(argv)

    if args.concurrency < 1:
        sys.exit("error: --concurrency must be >= 1")

    backend = _make_backend(args.backend)
    cfg = DEFAULT.__class__(CONCURRENCY=args.concurrency)
    result = asyncio.run(run_research(args.question, backend, config=cfg))
    print(to_json(result) if args.json else to_markdown(result))


if __name__ == "__main__":
    main()