from langchain.text_splitter import RecursiveCharacterTextSplitter
from langchain.vectorstores import Pinecone
from langchain.embeddings.sentence_transformer import SentenceTransformerEmbeddings
import pinecone
import asyncio
from langchain.document_loaders.sitemap import SitemapLoader


#Step 1: Loading data from website

def get_website_data(sitemap_url):

    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
    loader = SitemapLoader(
    sitemap_url
    )

    docs = loader.load()

    return docs

#Step 2:Split data into smaller chunks
def split_data(docs):

    text_splitter = RecursiveCharacterTextSplitter(
    chunk_size = 1000,
    chunk_overlap  = 200,
    length_function = len,
    )

    docs_chunks = text_splitter.split_documents(docs)
    return docs_chunks

#Step3: Embedding this Function to create embeddings instance
def create_embeddings():

    embeddings = SentenceTransformerEmbeddings(model_name="all-MiniLM-L6-v2")
    return embeddings

#Step 3: Push data to Pinecone
def push_to_pinecone(pinecone_apikey,pinecone_environment,pinecone_index_name,embeddings,docs):

    pinecone.init(
    api_key=pinecone_apikey,
    environment=pinecone_environment
    )

    index_name = pinecone_index_name
    index = Pinecone.from_documents(docs, embeddings, index_name=index_name)
    return index

#Step 4 & 5 pull index data from Pinecone
def pull_from_pinecone(pinecone_apikey,pinecone_environment,pinecone_index_name,embeddings):

    pinecone.init(
    api_key=pinecone_apikey,
    environment=pinecone_environment
    )

    index_name = pinecone_index_name

    index = Pinecone.from_existing_index(index_name, embeddings)
    return index

#Step 4 & 5 Fetch the top relevent documents from our vector store - Pinecone Index
def get_similar_docs(index,query,k=2):

    similar_docs = index.similarity_search(query, k=k)
    return similar_docs

def ask_and_get_answer(vector_store, q, k=3):
    from langchain.chains import RetrievalQA
    from langchain.chat_models import ChatOpenAI

    llm = ChatOpenAI(model='gpt-3.5-turbo', temperature=1)
    retriever = vector_store.as_retriever(search_type='similarity', search_kwargs={'k': k})
    chain = RetrievalQA.from_chain_type(llm=llm, chain_type="stuff", retriever=retriever)

    answer = chain.run(q)
    return answer