app.py

import os
import streamlit as st
from dotenv import load_dotenv
import google.generativeai as gen_ai

# Load environment variables
load_dotenv()

# Configure Streamlit page settings
st.set_page_config(
    page_title="Smart Waste Management System",
    page_icon="♻️",
    layout="centered",
)

# Retrieve the Google API key from the environment
GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY")

# Check if the API key is loaded
if not GOOGLE_API_KEY:
    st.error("🚨 API key not found! Please set the GOOGLE_API_KEY in your .env file.")
    st.stop()

# Configure the Generative AI model
try:
    gen_ai.configure(api_key=GOOGLE_API_KEY)
    model = gen_ai.GenerativeModel("gemini-1.5-pro")  # Updated model version
except Exception as e:
    st.error(f"❌ Error initializing the Gemini-Pro model: {e}")
    st.stop()

# Initialize the chat session if not already present in session state
if "chat_session" not in st.session_state:
    try:
        st.session_state.chat_session = model.start_chat(history=[])
    except Exception as e:
        st.error(f"❌ Error initializing chat session: {e}")
        st.stop()

# Display the app's title
st.title("♻️ Smart Waste Management System")

# Introduction and instructions
st.markdown(
    """
    Welcome to the **Smart Waste Management System**! This tool helps **citizens, municipal workers, 
    recycling companies, and biogas plants** collaborate efficiently for **better waste management**.

    ### **🌟 Key Features**
    - **Citizen Role:** Report waste collection issues and track garbage pickup.
    - **Municipal Workers:** Manage schedules and coordinate garbage segregation.
    - **Recycling Companies:** View and respond to requests for plastic waste.
    - **Biogas Plants:** Manage bio-waste for energy production.
    """
)

# User role selection
user_role = st.selectbox("🔹 Select Your Role:", ["Citizen", "Municipal Worker", "Recycling Company", "Biogas Plant"])

# Chat input
user_prompt = st.chat_input(f"💬 [{user_role}] Enter your query or task...")

if user_prompt:
    # Display the user's message
    st.chat_message("user").markdown(f"**{user_role}:** {user_prompt}")

    # Generate a role-specific prompt
    role_specific_prompt = f"You are assisting a {user_role} in a smart waste management system. The user says: {user_prompt}"

    # Send the prompt to Gemini-Pro and get the response
    try:
        gemini_response = st.session_state.chat_session.send_message(role_specific_prompt)

        # Display Gemini-Pro's response
        with st.chat_message("assistant"):
            st.markdown(gemini_response.text)

    except Exception as e:
        st.error(f"❌ Error processing your message: {e}")

# Sidebar Information
st.sidebar.title("📌 About")
st.sidebar.markdown(
    """
    The **Smart Waste Management System** aims to:
    - 🏡 **Improve waste collection efficiency** for citizens.
    - 🚛 **Help municipal workers** manage schedules.
    - 🔄 **Assist recycling companies** in waste processing.
    - ⚡ **Support biogas plants** in energy production.

    💡 **Need Help?** Use the chat to ask questions!
    """
)