from langchain.text_splitter import RecursiveCharacterTextSplitter
from langchain.document_loaders import PyPDFLoader
from langchain.vectorstores import Chroma
from langchain.embeddings import TensorflowHubEmbeddings
import os
import time
import streamlit as st

def embed_doc(filename):
    if len(os.listdir("."))>0:
        loader=PyPDFLoader(filename)        
        start = time.time()
        raw_documents = loader.load()
        # Split text

        text_splitter = RecursiveCharacterTextSplitter(
            chunk_size=1000,
            chunk_overlap=0,
            length_function=len

        )

        documents = text_splitter.split_documents(raw_documents)
        end = time.time()
        st.text("Load and split text: "+str(round(end - start,1)))


        start = time.time()
        embeddings = TensorflowHubEmbeddings(model_url="https://tfhub.dev/google/universal-sentence-encoder-multilingual-qa/3")
        end = time.time()
        st.text("Embedding time: "+str(round(end - start,1)))
        start = time.time()
        vectorstore = Chroma.from_documents(documents, embeddings)
        end = time.time()
        st.text("Vectorizing time: "+str(round(end - start,1)))
        return vectorstore