import streamlit as st
from streamlit_lottie import st_lottie
import fitz  # PyMuPDF
import requests
import os, shutil
import sidebar
import llm_model

@st.cache_data(experimental_allow_widgets=True)
def index_document(uploaded_file):

    if uploaded_file is not None:
        # Specify the folder path where you want to store the uploaded file in the 'assets' folder
        assets_folder = "assets/uploaded_files"
        if not os.path.exists(assets_folder):
            os.makedirs(assets_folder)

        # Save the uploaded file to the specified folder
        file_path = os.path.join(assets_folder, uploaded_file.name)
        with open(file_path, "wb") as f:
            f.write(uploaded_file.getvalue())

        file_name = os.path.join(assets_folder, uploaded_file.name)
        st.success(f"File '{file_name}' uploaded !")

        with st.spinner("Indexing document... This is a free CPU version and may take a while⏳"):
            llm_model.create_vector_db(file_name, instructor_embeddings)

        return file_name
    else:
        return None


def load_lottieurl(url: str):
    r = requests.get(url)
    if r.status_code != 200:
        return None
    return r.json()


def is_query_valid(query: str) -> bool:
    if not query:
        st.error("Please enter a question!")
        return False
    return True


# Function to load model parameters
@st.cache_resource()
def load_model():
    return llm_model.load_model_params()

st.set_page_config(page_title="Document QA Bot")
lottie_book = load_lottieurl("https://assets4.lottiefiles.com/temp/lf20_aKAfIn.json")
st_lottie(lottie_book, speed=1, height=200, key="initial")
# Place the title below the Lottie animation
st.title("PDF Q&A Bot 🤖")

# Left Sidebar
sidebar.sidebar()
# st.sidebar.header("Upload PDF")

# load model parameters
llm, instructor_embeddings = load_model()
# Upload file through Streamlit
uploaded_file = st.file_uploader("Upload a file", type=["pdf", "doc", "docx", "txt"])

filename = index_document(uploaded_file)
print(filename)

if not filename:
    st.stop()


with st.form(key="qa_form"):
    query = st.text_area("Ask a question about the document")
    submit = st.form_submit_button("Submit")

if submit:
    if not is_query_valid(query):
        st.stop()

    # Output Columns
    answer_col, sources_col = st.columns(2)

    qa_chain = llm_model.document_parser(instructor_embeddings, llm)
    result = qa_chain(query)

    with answer_col:
        st.markdown("#### Answer")
        st.markdown(result["result"])

    with sources_col:
        st.markdown("#### Sources")
        if not ("i don't know" in result["result"].lower()):
            for source in result["source_documents"]:
                st.markdown(source.page_content)
                st.markdown(source.metadata["source"])
                st.markdown("--------------------------")