from huggingface_hub import from_pretrained_keras
import keras_cv
import gradio as gr
from tensorflow import keras

keras.mixed_precision.set_global_policy("mixed_float16")
# load keras model
resolution = 512
dreambooth_model = keras_cv.models.StableDiffusion(
        img_width=resolution, img_height=resolution, jit_compile=True, 
    )
loaded_diffusion_model = from_pretrained_keras("keras-dreambooth/dreambooth_fantasy")
dreambooth_model._diffusion_model = loaded_diffusion_model


def generate_images(prompt: str, negative_prompt:str, num_imgs_to_gen: int, num_steps: int):
    """
    This function is used to generate images using our fine-tuned keras dreambooth stable diffusion model.
    Args:
        prompt (str): The text input given by the user based on which images will be generated.
        num_imgs_to_gen (int): The number of images to be generated using given prompt.
        num_steps (int): The number of denoising steps
    Returns:
        generated_img (List): List of images that were generated using the model
    """
    generated_img = dreambooth_model.text_to_image(
        prompt, 
        negative_prompt=negative_prompt,
        batch_size=num_imgs_to_gen,
        num_steps=num_steps,
    )
   
    return generated_img
    
with gr.Blocks() as demo:
    gr.HTML("<h2 style=\"font-size: 2em; font-weight: bold\" align=\"center\">Keras Dreambooth - Dreambooth Fantasy Demo</h2>")    
    with gr.Row():
        with gr.Column():
            prompt = gr.Textbox(lines=1, value="sks fantasy_world that is colorful with green scenary", label="Base Prompt")
            negative_prompt = gr.Textbox(lines=1, value="deformed", label="Negative Prompt")
            samples = gr.Slider(minimum=1, maximum=10, default=1, step=1, label="Number of Image")
            num_steps = gr.Slider(label="Inference Steps",value=50)
            run = gr.Button(value="Run")
        with gr.Column():
            gallery = gr.Gallery(label="Outputs").style(grid=(1,2))

    run.click(generate_images, inputs=[prompt,negative_prompt, samples, num_steps], outputs=gallery)
    
    gr.Examples([["A phot of sks fantasy_world that is colorful with green scenary","blue sky", 3, 75]],
                [prompt,negative_prompt, samples,num_steps], gallery, generate_images)
    gr.Markdown('\n Demo created by: <a href=\"https://huggingface.co/mwitiderrick/\">Derrick Mwiti</a>')

demo.launch(debug=True)