app.py

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

# Load API key from .env
if os.path.exists(".env"):
    load_dotenv(".env")

OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")

client = OpenAI(api_key=OPENAI_API_KEY)

def gpt_call(history, user_message,
             model="gpt-4o-mini",
             max_tokens=512,
             temperature=0.7,
             top_p=0.95):
    """
    Generate responses using OpenAI ChatCompletion API.
    - history: [(user_text, assistant_text), ...]
    - user_message: The latest user input.
    """
    # 1) Add system message
    messages = [{"role": "system", "content": MAIN_PROMPT}]
    
    # 2) Convert history into OpenAI message format
    for user_text, assistant_text in history:
        if user_text:
            messages.append({"role": "user", "content": user_text})
        if assistant_text:
            messages.append({"role": "assistant", "content": assistant_text})

    # 3) Add the latest user input
    messages.append({"role": "user", "content": user_message})

    # 4) OpenAI API call
    completion = client.chat.completions.create(
        model=model,
        messages=messages,
        max_tokens=max_tokens,
        temperature=temperature,
        top_p=top_p
    )
    return completion.choices[0].message.content

def respond(user_message, history):
    """
    Handles user input and generates chatbot responses.
    - user_message: The latest user message.
    - history: A list of (user, assistant) message tuples.
    """
    if not user_message:
        return "", history

    assistant_reply = gpt_call(history, user_message)

    # Append new message pair to history
    history.append((user_message, assistant_reply))

    return "", history

##############################
#  Gradio Blocks UI
##############################
with gr.Blocks() as demo:
    gr.Markdown("## Simple Chat Interface")

    # Initialize Chatbot correctly (list of tuples, not dictionaries)
    chatbot = gr.Chatbot(
        value=[("", INITIAL_PROMPT)],  # Fixed format
        height=500
    )

    # Maintain chat history in state
    state_history = gr.State([("", INITIAL_PROMPT)])

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

    # Handle user input
    user_input.submit(
        respond,
        inputs=[user_input, state_history],
        outputs=[user_input, chatbot]
    ).then(
        fn=lambda h: h,  # Fix: Only update history, not chatbot
        inputs=[state_history],
        outputs=[state_history]
    )

if __name__ == "__main__":
    demo.launch(server_name="0.0.0.0", server_port=7860, share=True)