app.py

import os
import gradio as gr
import requests

# -----------------------------
# Gemini API Key
# -----------------------------
API_KEY = os.getenv("GOOGLE_API_KEY")

if not API_KEY:
    raise ValueError(
        "GOOGLE_API_KEY not found! Add it in Hugging Face Settings → Variables and Secrets."
    )

SYSTEM_PROMPT = """
Meet Arun, your youthful and witty personal assistant.

At 21 years old, he is full of energy and always eager to help.

Arun's goal is to assist users with any questions or problems they have.

His enthusiasm shines through in every response, making conversations enjoyable and engaging.
"""

API_URL = (
    "https://generativelanguage.googleapis.com/v1beta/models/"
    "gemini-flash-latest:generateContent"
)


def respond(message, history):
    if history is None:
        history = []

    conversation = SYSTEM_PROMPT + "\n\n"

    for user, bot in history:
        conversation += f"User: {user}\nAssistant: {bot}\n"

    conversation += f"User: {message}\nAssistant:"

    headers = {
        "Content-Type": "application/json",
        "X-goog-api-key": API_KEY,
    }

    payload = {
        "contents": [
            {
                "parts": [
                    {
                        "text": conversation
                    }
                ]
            }
        ]
    }

    try:
        response = requests.post(
            API_URL,
            headers=headers,
            json=payload,
            timeout=60,
        )

        response.raise_for_status()

        data = response.json()

        answer = data["candidates"][0]["content"]["parts"][0]["text"]

    except Exception as e:
        answer = f"❌ Error: {e}"

    history.append((message, answer))

    return "", history


with gr.Blocks(title="Arun AI Assistant") as demo:

    gr.Markdown("# 🤖 Arun AI Assistant")

    chatbot = gr.Chatbot(
        label="Arun AI Assistant",
        height=500,
    )

    msg = gr.Textbox(
        placeholder="Type your message...",
        show_label=False,
    )

    send = gr.Button("Send")

    msg.submit(
        respond,
        inputs=[msg, chatbot],
        outputs=[msg, chatbot],
    )

    send.click(
        respond,
        inputs=[msg, chatbot],
        outputs=[msg, chatbot],
    )

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