from adrf.views import APIView as AsyncAPIView
from drf_spectacular.utils import extend_schema

from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework.parsers import MultiPartParser

from langchain.text_splitter import RecursiveCharacterTextSplitter

from langchain_huggingface import HuggingFaceEmbeddings

# from langchain_community.embeddings import HuggingFaceEmbeddings
from langchain.prompts import PromptTemplate
from langchain_core.runnables import RunnablePassthrough
from langchain_core.prompts import ChatPromptTemplate
from langchain_community.document_loaders import (
    PyPDFLoader,
    Docx2txtLoader,
    TextLoader,
    PyMuPDFLoader,
)
from langchain_community.vectorstores import Chroma
from langchain_google_genai import ChatGoogleGenerativeAI

# from langchain_community.chat_models import ChatOpenAI
from langchain_openai import ChatOpenAI, OpenAIEmbeddings
from langchain.schema import Document
from langchain.chains import create_extraction_chain
from langchain.chains.retrieval import create_retrieval_chain
from langchain.chains.combine_documents import create_stuff_documents_chain

from rank_bm25 import BM25Okapi