app.py

import os
import gradio as gr
from openai import OpenAI
from prompts.main_prompt import MAIN_PROMPT
from prompts.initial_prompt import INITIAL_PROMPT

# ✅ Load API Key
OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")

if not OPENAI_API_KEY:
    raise ValueError("⚠️ Missing OpenAI API Key! Set it in Hugging Face 'Settings' → 'Secrets'.")

client = OpenAI(api_key=OPENAI_API_KEY)

# ✅ Ensure Conversation Happens Step by Step
def respond(user_message, history):
    if not user_message:
        return "", history

    # ✅ AI only sends ONE response at a time (step-by-step)
    try:
        assistant_reply = client.chat.completions.create(
            model="gpt-4o",
            messages=[
                {"role": "system", "content": MAIN_PROMPT},
                *[
                    {"role": "user", "content": u} if i % 2 == 0 else {"role": "assistant", "content": a}
                    for i, (u, a) in enumerate(history)
                ],
                {"role": "user", "content": user_message}
            ],
            max_tokens=256,  # ✅ Limits response size (so AI doesn’t dump everything)
            temperature=0.7,
        ).choices[0].message.content
    except Exception as e:
        assistant_reply = f"⚠️ Error: {str(e)}"

    history.append((user_message, assistant_reply))

    return "", history

# ✅ Fix Gradio UI to Start Properly
with gr.Blocks() as demo:
    gr.Markdown("# **AI-Guided Math PD Chatbot**")

    chatbot = gr.Chatbot(
        value=[("", INITIAL_PROMPT)],  # ✅ Starts with an introduction message
        height=500
    )

    state_history = gr.State([("", INITIAL_PROMPT)])  # ✅ Ensures step-by-step history

    user_input = gr.Textbox(placeholder="Type your message here...", label="Your Input")

    user_input.submit(
        respond,
        inputs=[user_input, state_history],
        outputs=[user_input, chatbot]
    ).then(
        fn=lambda _, h: h,
        inputs=[user_input, chatbot],
        outputs=[state_history]
    )

if __name__ == "__main__":
    demo.launch()