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import gradio as gr
import numpy as np
import random
import spaces #[uncomment to use ZeroGPU]
from diffusers import ChromaPipeline
import torch

device = "cuda" if torch.cuda.is_available() else "cpu"
model_repo_id = "lodestones/Chroma1-HD"

if torch.cuda.is_available():
    torch_dtype = torch.bfloat16
else:
    torch_dtype = torch.float32

pipe = ChromaPipeline.from_pretrained(model_repo_id, torch_dtype=torch_dtype)
pipe = pipe.to(device)

MAX_SEED = np.iinfo(np.int32).max
MAX_IMAGE_SIZE = 1024

@spaces.GPU(duration=75) #[uncomment to use ZeroGPU]
def infer(prompt, negative_prompt, seed, randomize_seed, width, height, guidance_scale, num_inference_steps, lora_model, progress=gr.Progress(track_tqdm=True)):

    if randomize_seed:
        seed = random.randint(0, MAX_SEED)
        
    generator = torch.Generator(device).manual_seed(seed)
    
    # Handle LoRA if needed (ChromaPipeline may not support LoRA by default)
    # Uncomment and adapt if LoRA support is available
    # if lora_model: 
    #     pipe.load_lora_weights(lora_model)
        
    image = pipe(
        prompt=prompt, 
        negative_prompt=negative_prompt,
        guidance_scale=guidance_scale, 
        num_inference_steps=num_inference_steps, 
        width=width, 
        height=height,
        generator=generator,
        num_images_per_prompt=1
    ).images[0] 
    
    return image, seed

examples = [
    "A high-fashion close-up portrait of a blonde woman in clear sunglasses. The image uses a bold teal and red color split for dramatic lighting. The background is a simple teal-green. The photo is sharp and well-composed, and is designed for viewing with anaglyph 3D glasses for optimal effect. It looks professionally done.",
    "A surreal landscape with vibrant red and cyan color separation, featuring mountains and a lake, optimized for anaglyph 3D viewing",
    "A futuristic cityscape at night with neon lights, rendered in stereoscopic 3D style with red-cyan color separation",
]

css="""
#col-container {
    margin: 0 auto;
    max-width: 760px;
}
#button{
    align-self: stretch;
}
"""

with gr.Blocks(css=css) as demo:
    
    with gr.Column(elem_id="col-container"):
        gr.Markdown(f"""
        # Chroma1-HD - Anaglyph 3D Image Generation
        Generate stereoscopic 3D images optimized for red-cyan anaglyph glasses
        """)
        
        with gr.Row():
            prompt = gr.Text(
                label="Prompt",
                max_lines=1,
                placeholder="Enter your prompt",
            )
            negative_prompt = gr.Text(
                label="Negative prompt",
                max_lines=1,
                placeholder="Enter a negative prompt",
                value="low quality, ugly, unfinished, out of focus, deformed, disfigure, blurry, smudged, restricted palette, flat colors"
            )
        
        with gr.Row():
            run_button = gr.Button("Run", scale=1, elem_id="button")
        
        result = gr.Image(label="Result", show_label=False)

        with gr.Accordion("Advanced Settings", open=False):
            
            lora_model = gr.Textbox(
                label="LoRA model id (if supported)", 
                placeholder="Leave empty if not using LoRA",
                visible=False  # Hidden by default as ChromaPipeline may not support LoRA
            )
            
            guidance_scale = gr.Slider(
                label="Guidance Scale",
                minimum=1.0,
                maximum=10.0,
                step=0.1,
                value=3.0,  # Default from your example
            )
            
            seed = gr.Slider(
                label="Seed",
                minimum=0,
                maximum=MAX_SEED,
                step=1,
                value=433,  # Using the seed from your example
            )
            
            randomize_seed = gr.Checkbox(label="Randomize seed", value=True)
            
            with gr.Row():
                
                width = gr.Slider(
                    label="Width",
                    minimum=256,
                    maximum=MAX_IMAGE_SIZE,
                    step=32,
                    value=1024,  # Default resolution
                )
                
                height = gr.Slider(
                    label="Height",
                    minimum=256,
                    maximum=MAX_IMAGE_SIZE,
                    step=32,
                    value=1024,  # Default resolution
                )
            
            num_inference_steps = gr.Slider(
                label="Number of inference steps",
                minimum=1,
                maximum=100,
                step=1,
                value=40,  # Default from your example
            )
        
        gr.Examples(
            examples=examples,
            inputs=[prompt]
        )
    
    gr.on(
        triggers=[run_button.click, prompt.submit, negative_prompt.submit],
        fn=infer,
        inputs=[prompt, negative_prompt, seed, randomize_seed, width, height, guidance_scale, num_inference_steps, lora_model],
        outputs=[result, seed]
    )

demo.queue().launch()