import streamlit as st

from pdf_processing import process_pdf
from retrieve_and_display import retrieve_and_query, plot_images

from dotenv import load_dotenv
load_dotenv()

def upload_file():
    if not st.session_state.filename_and_retriever_engine:
        st.title("Upload File to chat with file")
    else:
        st.title(f"File {st.session_state.filename_and_retriever_engine[0]} loaded.")
        st.info("Click on Chat in sidebar")
        st.info("Upload another file if you want to chat with a different pdf")
    uploaded_file = st.file_uploader("Choose a PDF file", type="pdf")
    if uploaded_file is None:
        if not st.session_state.filename_and_retriever_engine:
            st.info("Please upload a PDF file.")
    else:
        st.info(f"Uploaded PDF: {uploaded_file.name}")
        if st.button("Process PDF"):
            with st.spinner("Processing PDF..."):
                st.session_state.filename_and_retriever_engine = uploaded_file.name, process_pdf(uploaded_file)
                st.success("PDF processed successfully!")
                st.success("Click on Chat in sidebar")
    

def ask_question():
    if st.session_state.filename_and_retriever_engine :
        st.title(f"Chat with {st.session_state.filename_and_retriever_engine[0]}")
        if user_question := st.chat_input("Ask a question"):
            with st.spinner("Retrieving information..."):
                response, retrieved_image_path_list = retrieve_and_query(user_question, st.session_state.filename_and_retriever_engine[1])
                print(retrieved_image_path_list)
            st.write("Retrieved Context:")
            for node in response.source_nodes:
                st.code(node.node.get_text())
            
            st.write("\nRetrieved Images:")
            # if len(retrieved_image_path_list) > 0:
            plot_images(retrieved_image_path_list)
                # st.pyplot()

            st.write("\nFinal Answer:")
            st.code(response.response)
    else:
        st.title("Upload File to chat with file")
        
    
    
def main():
    if "filename_and_retriever_engine" not in st.session_state:
        st.session_state.filename_and_retriever_engine = None
    page_names_to_funcs = {
        "Upload File": upload_file,
        "Chat": ask_question
    }

    demo_name = st.sidebar.selectbox("PDF Query Tool", page_names_to_funcs.keys())
    page_names_to_funcs[demo_name]()

if __name__ == "__main__":
    # login_page()
    main()