app.py

import os
import json
import sqlite3
from datetime import datetime
import streamlit as st
from langchain_huggingface import HuggingFaceEmbeddings
from langchain_chroma import Chroma
from langchain_groq import ChatGroq
from langchain.memory import ConversationBufferMemory
from langchain.chains import ConversationalRetrievalChain

from vectorize_documents import embeddings

working_dir = os.path.dirname(os.path.abspath(__file__))
config_data = json.load(open(f"{working_dir}/config.json"))
GROQ_API_KEY = config_data["GROQ_API_KEY"]
os.environ["GROQ_API_KEY"]= GROQ_API_KEY

# Set up the database with check_same_thread=False
def setup_db():
    conn = sqlite3.connect("chat_history.db", check_same_thread=False)  # Ensure thread-safe connection
    cursor = conn.cursor()
    cursor.execute("""
        CREATE TABLE IF NOT EXISTS chat_histories (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            username TEXT,
            timestamp TEXT,
            day TEXT,
            user_message TEXT,
            assistant_response TEXT
        )
    """)
    conn.commit()
    return conn  # Return the connection

# Function to save chat history to SQLite
def save_chat_history(conn, username, timestamp, day, user_message, assistant_response):
    cursor = conn.cursor()
    cursor.execute("""
        INSERT INTO chat_histories (username, timestamp, day, user_message, assistant_response)
        VALUES (?, ?, ?, ?, ?)
    """, (username, timestamp, day, user_message, assistant_response))
    conn.commit()

# Function to set up vectorstore for embeddings
def setup_vectorstore():
    embeddings = HuggingFaceEmbeddings()
    vectorstore = Chroma(persist_directory="House_vectordb", embedding_function=embeddings)
    return vectorstore

# Function to set up the chatbot chain
def chat_chain(vectorstore):
    llm = ChatGroq(model="llama-3.1-70b-versatile", temperature=0)
    retriever = vectorstore.as_retriever()
    memory = ConversationBufferMemory(
        llm=llm,
        output_key="answer",
        memory_key="chat_history",
        return_messages=True
    )
    chain = ConversationalRetrievalChain.from_llm(
        llm=llm,
        retriever=retriever,
        chain_type="stuff",
        memory=memory,
        verbose=True,
        return_source_documents=True
    )
    return chain

# Streamlit UI setup
st.set_page_config(page_title="House.Ai", page_icon="🤖AI", layout="centered")

st.title("🤖 House.Ai")
st.subheader("You can ask your general questions and queries to our AI")

# Step 1: Initialize the connection and check if the user is already logged in
if "conn" not in st.session_state:
    st.session_state.conn = setup_db()

if "username" not in st.session_state:
    username = st.text_input("Enter your name to proceed:")
    if username:
        with st.spinner("Loading chatbot interface... Please wait."):
            st.session_state.username = username
            st.session_state.chat_history = []  # Initialize empty chat history in memory
            st.session_state.vectorstore = setup_vectorstore()
            st.session_state.conversational_chain = chat_chain(st.session_state.vectorstore)
            st.success(f"Welcome, {username}! The chatbot interface is ready.")
else:
    username = st.session_state.username

# Step 2: Initialize components if not already set
if "conversational_chain" not in st.session_state:
    st.session_state.vectorstore = setup_vectorstore()
    st.session_state.conversational_chain = chat_chain(st.session_state.vectorstore)

# Step 3: Display the chat history in the UI
if "username" in st.session_state:
    st.subheader(f"Hello {username}, start your query below!")

    # Display chat history (messages exchanged between user and assistant)
    if st.session_state.chat_history:
        for message in st.session_state.chat_history:
            if message['role'] == 'user':
                with st.chat_message("user"):
                    st.markdown(message["content"])
            elif message['role'] == 'assistant':
                with st.chat_message("assistant"):
                    st.markdown(message["content"])

    # Input field for the user to type their message
    user_input = st.chat_input("Ask AI....")
    
    if user_input:
        with st.spinner("Processing your query... Please wait."):
            # Save user input to chat history in memory
            st.session_state.chat_history.append({"role": "user", "content": user_input})

            # Display user's message in chatbot (for UI display)
            with st.chat_message("user"):
                st.markdown(user_input)

            # Get assistant's response from the chain
            with st.chat_message("assistant"):
                response = st.session_state.conversational_chain({"question": user_input})
                assistant_response = response["answer"]
                st.markdown(assistant_response)

                # Save assistant's response to chat history in memory
                st.session_state.chat_history.append({"role": "assistant", "content": assistant_response})

                # Save the chat history to the database (SQLite)
                timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
                day = datetime.now().strftime("%A")  # Get the day of the week (e.g., Monday)
                save_chat_history(st.session_state.conn, username, timestamp, day, user_input, assistant_response)