from fastapi import APIRouter, UploadFile, File, Form, HTTPException
import os
import shutil
from scripts.rag_build_query import build_user_index

router = APIRouter()
ALLOWED_SUFFIXES = {".txt", ".md", ".pdf", ".docx"}

@router.post("/upload")
def upload_user_file(user_id: str = Form(...), file: UploadFile = File(...)):
    filename = os.path.basename(file.filename)
    suffix = os.path.splitext(filename)[-1].lower()
    if suffix not in ALLOWED_SUFFIXES:
        raise HTTPException(status_code=400, detail="不支持的文件类型")

    user_doc_dir = os.path.join("docs", user_id)
    os.makedirs(user_doc_dir, exist_ok=True)

    file_path = os.path.join(user_doc_dir, filename)
    try:
        with open(file_path, "wb") as f:
            shutil.copyfileobj(file.file, f)
        print(f"[UPLOAD] 文件已保存至 {file_path}")

        build_user_index(user_id)
        print(f"[UPLOAD] 用户 {user_id} 的索引已重建")

    except Exception as e:
        print(f"[UPLOAD ERROR] {e}")
        raise HTTPException(status_code=500, detail="索引构建失败")

    return {"status": "ok", "filename": filename}