pages/2_Chat.py

import streamlit as st
from app import chat_with_ai

st.title("Chat with PDFs")

# Initialize session state for sources if it doesn't exist
if 'sources' not in st.session_state:
    st.session_state.sources = None

# Create two columns for chat and sources
col1, col2 = st.columns([2, 1])

with col1:
    st.header("Chat")
    user_input = st.text_input("Ask a question about the uploaded content:")
    if st.button("Send"):
        if user_input:
            print(f"Sending user input: {user_input}")
            st.session_state.chat_progress = st.progress(0)
            response, sources = chat_with_ai(user_input)
            st.session_state.chat_progress.progress(1.0)
            st.markdown("**You:** " + user_input)
            st.markdown("**AI:** " + response)
            
            # Store sources in session state for display in col2
            st.session_state.sources = sources
            st.session_state.chat_progress.empty()
            # Clean up state
            del st.session_state.chat_progress 
        else:
            print("Empty user input")
            st.warning("Please enter a question.")

with col2:
    st.header("Source Chunks")
    if st.session_state.sources:
        for i, source in enumerate(st.session_state.sources, 1):
            with st.expander(f"Source {i} - {source['doc_name']}"):
                st.markdown(f"**Chunk Index:** {source['chunk_index']}")
                st.text(source['text'])
    else:
        st.info("Ask a question to see source chunks here.")