#!/usr/bin/env python

import random

import gradio as gr
import numpy as np
import PIL.Image
import torch
import torchvision.transforms.functional as TF
from diffusers import EulerAncestralDiscreteScheduler, StableDiffusionXLAdapterPipeline, T2IAdapter, AutoencoderKL

DESCRIPTION = "# T2I-Adapter-SDXL Sketch"

if not torch.cuda.is_available():
    DESCRIPTION += "\n<p>Running on CPU 🥶 This demo does not work on CPU.</p>"

styles = [
    {
        "name": "Cinematic",
        "prompt": "cinematic still {prompt} . emotional, harmonious, vignette, highly detailed, high budget, bokeh, cinemascope, moody, epic, gorgeous, film grain, grainy",
        "negative_prompt": "anime, cartoon, graphic, text, painting, crayon, graphite, abstract, glitch, deformed, mutated, ugly, disfigured"
    },
    {
        "name": "3D Model",
        "prompt": "professional 3d model {prompt} . octane render, highly detailed, volumetric, dramatic lighting",
        "negative_prompt": "ugly, deformed, noisy, low poly, blurry, painting"
    },
    {
        "name": "Anime",
        "prompt": "anime artwork {prompt} . anime style, key visual, vibrant, studio anime,  highly detailed",
        "negative_prompt": "photo, deformed, black and white, realism, disfigured, low contrast"
    },
    {
        "name": "Digital Art",
        "prompt": "concept art {prompt} . digital artwork, illustrative, painterly, matte painting, highly detailed",
        "negative_prompt": "photo, photorealistic, realism, ugly"
    },
    {
        "name": "Photographic",
        "prompt": "cinematic photo {prompt} . 35mm photograph, film, bokeh, professional, 4k, highly detailed",
        "negative_prompt": "drawing, painting, crayon, sketch, graphite, impressionist, noisy, blurry, soft, deformed, ugly"
    },
    {
        "name": "Pixel art",
        "prompt": "pixel-art {prompt} . low-res, blocky, pixel art style, 8-bit graphics",
        "negative_prompt": "sloppy, messy, blurry, noisy, highly detailed, ultra textured, photo, realistic"
    },
    {
        "name": "Fantasy art",
        "prompt": "ethereal fantasy concept art of  {prompt} . magnificent, celestial, ethereal, painterly, epic, majestic, magical, fantasy art, cover art, dreamy",
        "negative_prompt": "photographic, realistic, realism, 35mm film, dslr, cropped, frame, text, deformed, glitch, noise, noisy, off-center, deformed, cross-eyed, closed eyes, bad anatomy, ugly, disfigured, sloppy, duplicate, mutated, black and white"
    },
]

styles = {k['name']: (k['prompt'], k['negative_prompt']) for k in styles}
default_style = styles['Photographic']
style_names = list(styles.keys())


def apply_style(style, positive, negative=""):
    p, n = styles.get(style, default_style)
    return p.replace('{prompt}', positive), n + negative

device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
if torch.cuda.is_available():
    model_id = "stabilityai/stable-diffusion-xl-base-1.0"
    adapter = T2IAdapter.from_pretrained("TencentARC/t2i-adapter-sketch-sdxl-1.0", torch_dtype=torch.float16, variant="fp16")
    scheduler = EulerAncestralDiscreteScheduler.from_pretrained(model_id, subfolder="scheduler")
    pipe = StableDiffusionXLAdapterPipeline.from_pretrained(
        model_id,
        vae=AutoencoderKL.from_pretrained("madebyollin/sdxl-vae-fp16-fix", torch_dtype=torch.float16),
        adapter=adapter,
        scheduler=scheduler,
        torch_dtype=torch.float16,
        variant="fp16",
    )
    pipe.to(device)
else:
    pipe = None

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


def randomize_seed_fn(seed: int, randomize_seed: bool) -> int:
    if randomize_seed:
        seed = random.randint(0, MAX_SEED)
    return seed


def run(
    image: PIL.Image.Image,
    prompt: str,
    negative_prompt: str,
    style=default_style,
    num_steps=25,
    guidance_scale=5,
    adapter_conditioning_scale=0.8,
    cond_tau=0.8,
    seed=0,
) -> PIL.Image.Image:
    image = image.convert("RGB").resize((1024, 1024))
    image = TF.to_tensor(image) > 0.5
    image = TF.to_pil_image(image.to(torch.float32))

    prompt, negative_prompt = apply_style(style, prompt, negative_prompt)

    generator = torch.Generator(device=device).manual_seed(seed)
    out = pipe(
        prompt=prompt,
        negative_prompt=negative_prompt,
        image=image,
        num_inference_steps=num_steps,
        generator=generator,
        guidance_scale=guidance_scale,
        adapter_conditioning_scale=adapter_conditioning_scale,
        cond_tau=cond_tau,
    ).images[0]
    return out


with gr.Blocks() as demo:
    gr.Markdown(DESCRIPTION)
    with gr.Row():
        with gr.Column():
            image = gr.Image(
                source="canvas",
                tool="sketch",
                type="pil",
                image_mode="1",
                invert_colors=True,
                shape=(1024, 1024),
                brush_radius=4,
                height=600,
            )
            prompt = gr.Textbox(label="Prompt")
            run_button = gr.Button("Run")
            with gr.Accordion("Advanced options", open=False):
                style = gr.Dropdown(
                    choices=style_names,
                    value=default_style,
                    label="Style"
                )
                negative_prompt = gr.Textbox(
                    label="Negative prompt", value=""
                )
                num_steps = gr.Slider(
                    label="Number of steps",
                    minimum=1,
                    maximum=50,
                    step=1,
                    value=25,
                )
                guidance_scale = gr.Slider(
                    label="Guidance scale",
                    minimum=0.1,
                    maximum=10.0,
                    step=0.1,
                    value=5,
                )
                adapter_conditioning_scale = gr.Slider(
                    label="Adapter Conditioning Scale",
                    minimum=0.5,
                    maximum=1,
                    step=0.1,
                    value=.8,
                )
                cond_tau = gr.Slider(
                    label="Fraction of timesteps for which adapter should be applied",
                    minimum=0.5,
                    maximum=1,
                    step=0.1,
                    value=.8,
                )
                seed = gr.Slider(
                    label="Seed",
                    minimum=0,
                    maximum=MAX_SEED,
                    step=1,
                    value=0,
                )
                randomize_seed = gr.Checkbox(label="Randomize seed", value=True)
        with gr.Column():
            result = gr.Image(label="Result", height=600)

    inputs = [
        image,
        prompt,
        negative_prompt,
        style,
        num_steps,
        guidance_scale,
        adapter_conditioning_scale,
        cond_tau,
        seed,
    ]
    prompt.submit(
        fn=randomize_seed_fn,
        inputs=[seed, randomize_seed],
        outputs=seed,
        queue=False,
        api_name=False,
    ).then(
        fn=run,
        inputs=inputs,
        outputs=result,
        api_name=False,
    )
    run_button.click(
        fn=randomize_seed_fn,
        inputs=[seed, randomize_seed],
        outputs=seed,
        queue=False,
        api_name=False,
    ).then(
        fn=run,
        inputs=inputs,
        outputs=result,
        api_name="run",
    )

if __name__ == "__main__":
    demo.queue(max_size=20).launch()