pages/chat.py

import streamlit as st
from utils.api import get_chatgpt_response
from utils.chat_helpers import (
    process_pdf, 
    initialize_vector_store, 
    add_pdf_to_vector_store,
    process_txt,
    process_md,
    process_docx,
    process_csv,
    process_html,
    process_pptx,
    process_audio,
    parse_text
)

# Initialize session state variables if not present
if "messages" not in st.session_state:
    st.session_state.messages = []

if "model" not in st.session_state:
    st.session_state.model = "gpt-4o-mini"

if "file_text" not in st.session_state:
    st.session_state.file_text = ""

if "vector_store" not in st.session_state:
    st.session_state.vector_store = initialize_vector_store()

st.title(f"Chat with {st.session_state.model} AI Model")

# Sidebar for model selection and file upload
with st.sidebar:
    st.header("Configuration")
    
    st.session_state.model = st.selectbox(
        "Choose a model:",
        ("gpt-4o-mini", "gpt-4o", "gpt-3.5-turbo", "gpt-4", "gpt-4-turbo")
    )

    uploaded_file = st.file_uploader("Upload a file", type=["pdf", "txt", "md", "docx", "csv", "html", "pptx", "mp3", "wav"])
    if uploaded_file is not None:
        file_extension = uploaded_file.name.split('.')[-1]
        if file_extension == "pdf":
            st.session_state.file_text = process_pdf(uploaded_file)
        elif file_extension == "txt":
            st.session_state.file_text = process_txt(uploaded_file)
        elif file_extension == "md":
            st.session_state.file_text = process_md(uploaded_file)
        elif file_extension == "docx":
            st.session_state.file_text = process_docx(uploaded_file)
        elif file_extension == "csv":
            st.session_state.file_text = process_csv(uploaded_file)
        elif file_extension == "html":
            st.session_state.file_text = process_html(uploaded_file)
        elif file_extension == "pptx":
            st.session_state.file_text = process_pptx(uploaded_file)
        elif file_extension in ["mp3", "wav"]:
            st.session_state.file_text = process_audio(uploaded_file)
        
        add_pdf_to_vector_store(st.session_state.file_text, st.session_state.vector_store)
        st.success(f"{file_extension.upper()} file uploaded and processed successfully!")

    if st.button("Reset File"):
        st.session_state.file_text = ""
        st.session_state.vector_store = initialize_vector_store()
        st.success("File and vector store reset successfully!")

# Display chat history using the new chat API
for message in st.session_state.messages:
    if message["role"] == "user":
        st.chat_message("user").markdown(parse_text(message["content"]))
    else:
        st.chat_message("assistant").markdown(parse_text(message["content"]))

# Use st.chat_input for user input
if user_input := st.chat_input("You:"):
    st.session_state.messages.append({"role": "user", "content": user_input})
    response = get_chatgpt_response(st.session_state.messages, user_input, st.session_state.model, st.session_state.vector_store)
    st.session_state.messages.append({"role": "assistant", "content": response})
    
    # Display the user message and the assistant's response
    st.chat_message("user").markdown(parse_text(user_input))
    st.chat_message("assistant").markdown(parse_text(response))