"""统计 API — /api/stats"""
from fastapi import APIRouter, Request

from app.services.retriever import Retriever

router = APIRouter()


@router.get("/stats")
async def stats(request: Request):
    """返回索引统计信息"""
    trace_id = getattr(request.state, "trace_id", "")
    retriever = Retriever.get_instance()
    data = retriever.get_stats()
    return {
        "code": 0,
        "message": "ok",
        "data": data,
        "trace_id": trace_id,
    }