streamlit_app.py

import streamlit as st
import requests
import os

# Load your Groq API key from Hugging Face secret
GROQ_API_KEY = os.getenv("GROQ_API_KEY")

# System prompt for the chatbot
SYSTEM_PROMPT = """
You are an experienced automobile technician. Based on the user's question, provide:
1. Likely reasons for the vehicle issue
2. Diagnosis or explanation
3. Suggested fixes or preventive actions

Keep your answers simple, practical, and useful for everyday car owners.
"""

def query_groq(user_input):
    url = "https://api.groq.com/openai/v1/chat/completions"  # ✅ Correct endpoint

    headers = {
        "Authorization": f"Bearer {GROQ_API_KEY}",
        "Content-Type": "application/json"
    }

    data = {
        "model": "llama3-70b-8192",  # ✅ Supported Groq model
        "messages": [
            {"role": "system", "content": SYSTEM_PROMPT},
            {"role": "user", "content": user_input}
        ],
        "temperature": 0.5,
        "max_tokens": 500
    }

    try:
        response = requests.post(url, headers=headers, json=data)
        response.raise_for_status()
        return response.json()["choices"][0]["message"]["content"]
    except Exception as e:
        return f"❌ Error: {str(e)}"

# Streamlit UI
st.set_page_config(page_title="Vehicle Diagnostic Chatbot", page_icon="🚗")
st.title("🚗 Vehicle Issue Diagnostic Chatbot")
st.markdown("Describe your vehicle issue (e.g. *My car is overheating*) and get expert help.")

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

with st.form("chat_form", clear_on_submit=True):
    user_input = st.text_input("Describe your vehicle problem:")
    submitted = st.form_submit_button("Get Diagnosis")

if submitted and user_input:
    with st.spinner("Analyzing..."):
        bot_reply = query_groq(user_input)
        st.session_state.chat_history.append(("You", user_input))
        st.session_state.chat_history.append(("Bot", bot_reply))

# Show chat history
for sender, message in st.session_state.chat_history:
    st.markdown(f"**{sender}:** {message}")