app.py

import gradio as gr
import google.generativeai as genai
import requests
import io

# List of popular styles
STYLES = [
    "Photorealistic", "Oil Painting", "Watercolor", "Anime", 
    "Studio Ghibli", "Black and White", "Polaroid", "Sketch", 
    "3D Render", "Pixel Art", "Cyberpunk", "Steampunk", 
    "Art Nouveau", "Pop Art", "Minimalist"
]

# Default negative prompt
DEFAULT_NEGATIVE_PROMPT = """
ugly, tiling, poorly drawn hands, poorly drawn feet, poorly drawn face, out of frame, 
extra limbs, disfigured, deformed, body out of frame, bad anatomy, watermark, signature, 
cut off, low contrast, underexposed, overexposed, bad art, beginner, amateur, distorted face
"""

def enhance_prompt(google_api_key, prompt, style):
    genai.configure(api_key=google_api_key)
    model = genai.GenerativeModel("gemini-2.0-flash-lite")
    enhanced_prompt_request = f"""
    Task: Enhance the following prompt for image generation.
    Style: {style}
    Original prompt: '{prompt}'
    
    Instructions:
    1. Expand the prompt to be more detailed and vivid.
    2. Incorporate elements of the specified style.
    3. Maintain the original intent of the prompt.
    4. Provide ONLY the enhanced prompt, without any explanations or options.
    5. Keep the enhanced prompt concise, ideally under 100 words.

    Enhanced prompt:
    """
    
    response = model.generate_content(enhanced_prompt_request)
    
    enhanced_prompt = response.text.strip()
    
    prefixes_to_remove = ["Enhanced prompt:", "Here's the enhanced prompt:", "The enhanced prompt is:"]
    for prefix in prefixes_to_remove:
        if enhanced_prompt.lower().startswith(prefix.lower()):
            enhanced_prompt = enhanced_prompt[len(prefix):].strip()
    
    return enhanced_prompt

def generate_image(stability_api_key, enhanced_prompt, style, negative_prompt):
    url = "https://api.stability.ai/v2beta/stable-image/generate/sd3"
    
    headers = {
        "Accept": "image/*",
        "Authorization": f"Bearer {stability_api_key}"
    }
    
    data = {
        "prompt": f"{enhanced_prompt}, Style: {style}",
        "negative_prompt": negative_prompt,
        "model": "sd3.5-large-turbo",
        "width": "1024",
        "height": "1024",
        "num_images": "1",
        "steps": "30",
        "cfg_scale": "7.5",
        "seed": "0",
        "output_format": "png"
    }
    
    response = requests.post(url, headers=headers, data=data)
    
    if response.status_code == 200:
        return response.content
    else:
        raise Exception(f"Image generation failed: {response.text}")

def process_and_generate(google_api_key, stability_api_key, prompt, style, negative_prompt):
    enhanced_prompt = enhance_prompt(google_api_key, prompt, style)
    image_data = generate_image(stability_api_key, enhanced_prompt, style, negative_prompt)
    return image_data, enhanced_prompt

with gr.Blocks() as demo:
    gr.Markdown("# Stability AI Image Generator with Google Gemini Prompt Enhancement")
    
    with gr.Row():
        with gr.Column(scale=1):
            google_api_key = gr.Textbox(label="Google AI API Key", type="password")
            stability_api_key = gr.Textbox(label="Stability AI API Key", type="password")
            prompt = gr.Textbox(label="Prompt")
            style = gr.Dropdown(label="Style", choices=STYLES)
            negative_prompt = gr.Textbox(label="Negative Prompt", value=DEFAULT_NEGATIVE_PROMPT)
            submit_btn = gr.Button("Generate Image")
        
        with gr.Column(scale=1):
            image_output = gr.Image(label="Generated Image")
            enhanced_prompt_output = gr.Textbox(label="Enhanced Prompt")
    
    submit_btn.click(
        process_and_generate,
        inputs=[google_api_key, stability_api_key, prompt, style, negative_prompt],
        outputs=[image_output, enhanced_prompt_output]
    )

demo.launch()