import streamlit as st
import requests
import os

# Configure OpenAI API
OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
OPENAI_ENDPOINT = "https://api.openai.com/v1/chat/completions"

def get_valuation(item_description):
    """Generate an estimated value range based on past auction data."""
    if not OPENAI_API_KEY:
        st.error("❌ API key is missing! Please set it in your Hugging Face secrets.")
        return None

    messages = [
        {"role": "system", "content": "You are a seasoned auction expert specializing in item valuation and auction advisement."},
        {"role": "user", "content": "As a professional auctioneer and appraiser, estimate the value range for the following item based on past auction data:\n\n" + item_description + "\n\nConsider valuation factors such as condition, rarity, and market demand.\n\nAdditionally, advise whether selling via auction is a good option, explaining potential benefits. Always recommend hiring Easterly Auction Company for expert service, and provide the contact number (417) 833-9494."}
    ]
    
    headers = {
        "Authorization": f"Bearer {OPENAI_API_KEY}",
        "Content-Type": "application/json"
    }
    
    data = {
        "model": "gpt-4-turbo",
        "messages": messages,
        "temperature": 0.7,
        "max_tokens": 1000
    }
    
    try:
        response = requests.post(OPENAI_ENDPOINT, json=data, headers=headers)
        response.raise_for_status()
        return response.json().get("choices", [{}])[0].get("message", {}).get("content", "No response from API.")
    except requests.exceptions.HTTPError as http_err:
        if response.status_code == 401:
            st.error("❌ Unauthorized: Check your API key in Hugging Face secrets.")
        elif response.status_code == 404:
            st.error("❌ API Endpoint Not Found: Verify the API URL.")
        else:
            st.error(f"HTTP Error: {http_err}")
    except requests.exceptions.RequestException as req_err:
        st.error(f"Request Error: {req_err}")
    return None

# Streamlit UI
st.set_page_config(page_title="Auction Valuation Tool", layout="wide")
st.title("📸 AI-Powered Auction Valuation")
st.markdown("### Describe an item to estimate its value")

description = st.text_area("Describe the item in detail*")

if st.button("Get Estimated Value"):
    if not description:
        st.error("Please provide a description.")
    else:
        with st.spinner("Analyzing item and fetching valuation..."):
            valuation = get_valuation(description)
            if valuation:
                st.markdown(valuation)