app.py

import streamlit as st
import requests
import io
import os
from PIL import Image
from datetime import datetime

# Set up Hugging Face API key
HUGGINGFACE_API_KEY = os.getenv('HUGGINGFACE_API_KEY')

# Dictionary of available models and their API endpoints
MODELS = {
    "Stable Diffusion XL": "https://api-inference.huggingface.co/models/stabilityai/stable-diffusion-xl-base-1.0",
    "Flux 1": "https://api-inference.huggingface.co/models/black-forest-labs/FLUX.1-dev",
    "Flux Midjourney": "https://api-inference.huggingface.co/models/strangerzonehf/Flux-Midjourney-Mix2-LoRA",
    "Playground v2": "https://api-inference.huggingface.co/models/playgroundai/playground-v2-1024px-aesthetic"
}

def generate_image(prompt, model_url):
    """Generate image using Hugging Face API"""
    headers = {
        "Authorization": f"Bearer {HUGGINGFACE_API_KEY}",
        "Content-Type": "application/json"
    }
    
    data = {
        "inputs": prompt,
        "parameters": {
            "num_inference_steps": 20,
            "guidance_scale": 7.5
        }
    }
    
    response = requests.post(
        model_url,
        headers=headers,
        json=data
    )
    
    if response.status_code == 200:
        return response.content
    else:
        st.error(f"Error: {response.text}")
        return None

def save_image(image_data, model_name):
    """Save the generated image"""
    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
    filename = f"generated_{model_name}_{timestamp}.png"
    
    image = Image.open(io.BytesIO(image_data))
    image.save(filename)
    return filename

# Streamlit UI
st.title("Open Source Text-to-Image Generation")
st.markdown("""
This app uses state-of-the-art open source text-to-image models via Hugging Face's API.
- **SDXL**: Latest Stable Diffusion model with exceptional quality
- **Flux 1**: Optimized for speed and quality
- **Flux Midjourney**: Compact but powerful model
- **Playground v2**: Specialized in aesthetic generations
""")

# API key input
if 'api_key_set' not in st.session_state:
    st.session_state.api_key_set = False

if not st.session_state.api_key_set:
    with st.form("api_key_form"):
        huggingface_key = st.text_input("Enter Hugging Face API Key:", type="password", 
                                       help="Get your free API key from huggingface.co")
        submit = st.form_submit_button("Save API Key")
        
        if submit:
            os.environ['HUGGINGFACE_API_KEY'] = huggingface_key
            st.session_state.api_key_set = True
            st.rerun()

if st.session_state.api_key_set:
    # Model selection
    model = st.selectbox(
        "Choose Model:",
        list(MODELS.keys())
    )
    
    # Advanced options
    with st.expander("Advanced Options"):
        seed = st.number_input("Random Seed (optional)", min_value=0, max_value=999999999, value=0)
        if seed > 0:
            st.info("Using the same seed will generate similar images for the same prompt")

    # Prompt input
    prompt = st.text_area(
        "Enter your prompt:",
        height=100,
        help="Describe what you want to see in the image. Be specific!"
    )
    
    # Generate image button

    if st.button("Generate Image"):
        if prompt:
            with st.spinner(f"Generating image using {model}..."):
                image_data = generate_image(prompt, MODELS[model])
                
                if image_data:
                    # Save the image
                    filename = save_image(image_data, model.lower().replace(" ", "_"))
                    
                    # Display the image
                    st.image(Image.open(io.BytesIO(image_data)))
                    
                    # Display prompt used
                    st.text_area("Prompt used:", prompt, height=100, disabled=True)
                    
                    # Download button
                    with open(filename, "rb") as file:
                        btn = st.download_button(
                            label="Download Image",
                            data=file,
                            file_name=filename,
                            mime="image/png"
                        )
        else:
            st.warning("Please enter a prompt.")

    # Display model information
    st.markdown("### About the Selected Model")
    model_info = {
        "Stable Diffusion XL": "The latest version of Stable Diffusion, known for its high-quality outputs and improved understanding of prompts.",
        "Flux 1": "A highly optimized model that balances speed and quality, great for quick iterations.",
        "Flux Midjourney": "A compact 1B parameter model that produces impressive results with faster inference times.",
        "Playground v2": "Specialized in creating highly aesthetic images with strong composition and artistic quality."
    }
    st.info(model_info[model])