# app/rag_initializer.py
from ..rag.tools import create_rag_tool_sync
from rag_core import create_parent_retriever
from ..model_services import get_embedding_service
from ..logger import info, warning

async def init_rag_tool(local_llm_creator):
    """初始化 RAG 工具，失败返回 None"""
    try:
        info("🔄 正在初始化 RAG 检索系统...")
        # 使用统一的嵌入服务获取接口
        embeddings = get_embedding_service()
        retriever = create_parent_retriever(
            collection_name="rag_documents",
            search_k=5,
            embeddings=embeddings
        )
        rewrite_llm = local_llm_creator()
        rag_tool = create_rag_tool_sync(
            retriever, rewrite_llm,
            num_queries=3, rerank_top_n=5
        )
        info("✅ RAG 检索工具初始化成功")
        return rag_tool
    except Exception as e:
        warning(f"⚠️ RAG 检索工具初始化失败: {e}")
        return None