app/lib/openai_client.py

from __future__ import annotations
from openai import OpenAI
from ..config import settings

_client: OpenAI | None = None

def get_client() -> OpenAI:
    """
    OpenAI v1 SDK のクライアントを（環境変数から）初期化して返す。
    HF Spaces の Secrets に OPENAI_API_KEY を設定しておくこと。
    """
    global _client
    if _client is None:
        if not settings.openai_api_key:
            raise RuntimeError("OPENAI_API_KEY is not set in the environment.")
        _client = OpenAI(api_key=settings.openai_api_key)
    return _client

def embed_texts(texts: list[str], model: str | None = None) -> list[list[float]]:
    """
    文章群を埋め込みに変換（既定: text-embedding-3-small）。
    """
    model = model or settings.embedding_model
    client = get_client()
    res = client.embeddings.create(model=model, input=texts)
    return [d.embedding for d in res.data]

def chat_summarize(prompt: str, model: str | None = None) -> str:
    """
    文章の要約やクラスタ説明を作るための軽量ヘルパ。
    """
    model = model or settings.chat_model
    client = get_client()
    msg = client.chat.completions.create(
        model=model,
        messages=[
            {"role": "system", "content": "You are a concise multilingual analyst. Respond in Japanese."},
            {"role": "user", "content": prompt}
        ],
        temperature=0.2,
    )
    return (msg.choices[0].message.content or "").strip()