app.py

import os
import streamlit as st
from langchain_core.messages import HumanMessage
from langchain_google_genai import ChatGoogleGenerativeAI

# Set the Google API Key environment variable
os.environ['GOOGLE_API_KEY'] = '********************************'

def generate_chat_message(prompt):
    model = ChatGoogleGenerativeAI(model="gemini-pro")
    message = HumanMessage(content=prompt)
    response = model.stream([message])

    response_text = ""
    for chunk in response:
        response_text += chunk.content
    return response_text

def submit_input():
    st.session_state.chat_history = []
    user_input = st.session_state.user_input
    if user_input:
        # Append user message to chat history
        st.session_state.chat_history.append(("User", user_input))

        # Generate response from the model
        response = generate_chat_message(user_input)
        
        # Append model response to chat history
        st.session_state.chat_history.append(("AI", response))

        # Clear the input box by setting session state
        st.session_state.user_input = ""

# Streamlit app layout
st.title("Chat with LLM")

if "chat_history" not in st.session_state:
    st.session_state.chat_history = []

# Input text box for the user
st.text_input("You:", key="user_input", on_change=submit_input)

# Display the chat history
for sender, message in st.session_state.chat_history:
    if sender == "User":
        st.write(f"**You:** {message}")
    else:
        st.write(f"**AI:** {message}")

print(st.session_state)