app.py

import os
import gradio as gr
from openai import OpenAI

# Initialize OpenAI client
client = OpenAI(api_key=os.getenv("OPENAI_API_KEY"))

# Streaming response function
def respond(
    message,
    history: list[tuple[str, str]],
    system_message,
    segment_profile,
    value_proposition,
    promotion,
    subject,
    ask_for_subject_suggestions,
    max_tokens,
    temperature,
    top_p,
):
    # Compose enhanced system message
    enhanced_system_message = (
        f"{system_message}\n\n"
        f"Segment Profile: {segment_profile}\n"
        f"Value Proposition: {value_proposition}\n"
        f"Goal and Promotion: {promotion}\n"
        f"Subject Line: {subject}\n"
    )

    if ask_for_subject_suggestions:
        enhanced_system_message += " The user is also asking for subject line suggestions to catch their customer's attention and improve Email Open Rate."

    # Build message history
    messages = [{"role": "system", "content": enhanced_system_message}]
    for user_msg, assistant_msg in history:
        if user_msg:
            messages.append({"role": "user", "content": user_msg})
        if assistant_msg:
            messages.append({"role": "assistant", "content": assistant_msg})
    messages.append({"role": "user", "content": message})

    # Stream response from OpenAI
    response_text = ""
    try:
        response = client.chat.completions.create(
            model="gpt-4o-mini",  # or "gpt-4o" if mini unavailable
            messages=messages,
            max_tokens=max_tokens,
            temperature=temperature,
            top_p=top_p,
            stream=True,
        )
        for chunk in response:
            if chunk.choices and chunk.choices[0].delta.content:
                token = chunk.choices[0].delta.content
                response_text += token
                yield response_text
    except Exception as e:
        yield f"❌ An error occurred: {str(e)}"

# Gradio interface
demo = gr.ChatInterface(
    fn=respond,
    additional_inputs=[
        gr.Textbox(
            value="You are a friendly Chatbot, a digital marketing expert and a talented copywriter. You are trying to help a user write a creative email that can achieve campaign goals, a high Open Rate, CTR and conversion rate - based on user input.",
            label="Instructions to Bot",
        ),
        gr.Textbox(label="Your Target Customer Segment Profile", placeholder="Describe the profile of your target customer segment (e.g., age, gender, interests, profession)"),
        gr.Textbox(label="Your Value Proposition", placeholder="Describe how your solution to customer problems offers them unique value"),
        gr.Textbox(label="Campaign Goal, Special Event, Promotion and Call to Action", placeholder="Describe your campaign goal, a special event, promotion and Call to Action that you hope your target segment will act upon"),
        gr.Textbox(label="Subject Line", placeholder="Enter the Subject Line of the Email or ask for suggestions"),
        gr.Checkbox(label="Ask for Subject Line Suggestions", value=False),
        gr.Slider(minimum=1, maximum=2048, value=512, step=1, label="Max new tokens"),
        gr.Slider(minimum=0.1, maximum=4.0, value=0.7, step=0.1, label="Temperature"),
        gr.Slider(minimum=0.1, maximum=1.0, value=0.95, step=0.05, label="Top-p (nucleus sampling)"),
    ],
    title="Email Copywriter",
    description="This app creates a customized email that resonates with your customers to improve CTR and conversion. Based on your input. Powered by OpenAI GPT-4o. Developed by wn. Disclaimer: AI makes mistakes. Use with caution and at your own risk!",
    type="messages",
)

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