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from argparse import Namespace
from glob import glob
import yaml
import os

import spaces
import gradio as gr
import torch
import torchvision
import safetensors
from diffusers import AutoencoderKL, ConsistencyDecoderVAE
from peft import get_peft_model, LoraConfig, set_peft_model_state_dict
from huggingface_hub import snapshot_download

pretrained_model_path = snapshot_download(repo_id="revp2024/revp-censorship")
with open(glob(os.path.join(pretrained_model_path, 'hparams.yml'), recursive=True)[0]) as f:
    args = Namespace(**yaml.safe_load(f))

with open('examples/add_censorship.yaml') as f:
    add_censor_examples = yaml.safe_load(f)
with open('examples/remove_censorship.yaml') as f:
    remove_censor_examples = yaml.safe_load(f)

def prepare_model():
    print('Loading model ...')
    vae_lora_config = LoraConfig(
        r=args.rank,
        lora_alpha=args.rank,
        init_lora_weights="gaussian",
        target_modules=["conv", "conv1", "conv2",
                        "to_q", "to_k", "to_v", "to_out.0"],
    )
    vae = AutoencoderKL.from_pretrained(
        args.pretrained_model_name_or_path, subfolder="vae"
    )
    vae = get_peft_model(vae, vae_lora_config)
    lora_weights_path = os.path.join(pretrained_model_path, f"pytorch_lora_weights.safetensors")
    state_dict = {}
    with safetensors.torch.safe_open(lora_weights_path, framework="pt", device="cpu") as f:
       for key in f.keys():
           state_dict[key] = f.get_tensor(key)

    set_peft_model_state_dict(vae, state_dict)

    print('Done.')
    cd_vae = ConsistencyDecoderVAE.from_pretrained("openai/consistency-decoder", torch_dtype=torch.float16)
    vae = vae.to('cuda' if torch.cuda.is_available() else 'mps' if torch.backends.mps.is_available() else 'cpu')
    cd_vae = cd_vae.to('cuda' if torch.cuda.is_available() else 'mps' if torch.backends.mps.is_available() else 'cpu')
    return vae, cd_vae


@spaces.GPU
@torch.no_grad()
def add_censorship(input_image, mode, pixelation_block_size, blur_kernel_size, soft_edges, soft_edge_kernel_size):
    background, layers, _ = input_image.values()
    input_images = torch.from_numpy(background).permute(2, 0, 1)[None, :3] / 255
    mask = torch.from_numpy(layers[0]).permute(2, 0, 1)[None, -1:] / 255

    H, W = input_images.shape[-2:]
    if H > 1024 or W > 1024:
        H_t, W_t = H, W
        if H > W:
            H, W = 1024, int(1024 * W_t / H_t)
        else:
            H, W = int(1024 * H_t / W_t), 1024
    H_q8 = (H // 8) * 8
    W_q8 = (W // 8) * 8
    input_images = torch.nn.functional.interpolate(input_images, (H_q8, W_q8), mode='bilinear')
    mask = torch.nn.functional.interpolate(mask, (H_q8, W_q8))
    if soft_edges:
        mask = torchvision.transforms.functional.gaussian_blur(mask, soft_edge_kernel_size)[0][0]

    input_images = input_images.to(vae.device)

    if mode == 'Pixelation':
        censored = torch.nn.functional.avg_pool2d(
            input_images, pixelation_block_size)
        censored = torch.nn.functional.interpolate(censored, input_images.shape[-2:])
    elif mode == 'Gaussian blur':
        censored = torchvision.transforms.functional.gaussian_blur(
            input_images, blur_kernel_size)
    elif mode == 'Black':
        censored = torch.zeros_like(input_images)
    else:
        raise ValueError("censor_mode has to be either `pixelation' or `gaussian_blur'")
    
    mask = mask.to(input_images.device)
    censored_images = input_images * (1 - mask) + censored * mask
    censored_images *= 255

    input_images = input_images * 2 - 1
    with vae.disable_adapter():
        latents = vae.encode(input_images).latent_dist.mean
    images = vae.decode(latents, return_dict=False)[0]

    # denormalize
    images = images / 2 + 0.5
    images *= 255

    residuals = (images - censored_images).clamp(-args.budget, args.budget)
    images = (censored_images + residuals).clamp(0, 255).to(torch.uint8)

    gr.Info("Try to donwload/copy the censored image to the `Remove censorsip' tab")
    return images[0].permute(1, 2, 0).cpu().numpy()

@spaces.GPU
@torch.no_grad()
def remove_censorship(input_image, use_cd, x1, y1, x2, y2):
    background, layers, _ = input_image.values()
    images = torch.from_numpy(background).permute(2, 0, 1)[None, :3] / 255
    mask = torch.from_numpy(layers[0]).permute(2, 0, 1)[None, -1:] / 255
    images = images * (1 - mask)
    images = images[..., y1:y2, x1:x2]
    latents = vae.encode((images * 2 - 1).to(vae.device)).latent_dist.mean
    if use_cd:
        images = cd_vae.decode(latents.to(cd_vae.dtype), return_dict=False)[0]
    else:
        with vae.disable_adapter():
            images = vae.decode(latents, return_dict=False)[0]
    # denormalize
    images = images / 2 + 0.5
    images *= 255
    images = images.clamp(0, 255).to(torch.uint8)
    return images[0].permute(1, 2, 0).cpu().numpy()

# @@@@@@@ Start of the program @@@@@@@@

vae, cd_vae = prepare_model()

css = '''
.my-disabled {
    background-color: #eee;
}
.my-disabled input {
    background-color: #eee;
}
'''
with gr.Blocks(css=css) as demo:
    gr.Markdown('# ReVP: Reversible Visual Processing with Latent Models')
    gr.Markdown('### Check out our project page for more info: https://revp2024.github.io')
    with gr.Tab('Add censorship'):
        with gr.Row():
            with gr.Column():
                input_image = gr.ImageEditor(brush=gr.Brush(default_size=100))
                with gr.Accordion('Options', open=False) as options_accord:
                    mode = gr.Radio(label='Mode', choices=['Pixelation', 'Gaussian blur', 'Black'],
                                    value='Pixelation', interactive=True)
                    pixelation_block_size = gr.Slider(label='Block size', minimum=10, maximum=40, value=25, step=1, interactive=True)
                    blur_kernel_size = gr.Slider(label='Blur kernel size', minimum=21, maximum=151,  value=85, step=2, interactive=True, visible=False)
                    def change_mode(mode):
                        if mode == 'Gaussian blur':
                            return gr.Slider(visible=False), gr.Slider(visible=True), gr.Accordion(open=True)
                        elif mode == 'Pixelation':
                            return gr.Slider(visible=True), gr.Slider(visible=False), gr.Accordion(open=True)
                        elif mode == 'Black':
                            return gr.Slider(visible=False), gr.Slider(visible=False), gr.Accordion(open=True)
                        else:
                            raise NotImplementedError
                    mode.select(change_mode, mode, [pixelation_block_size, blur_kernel_size, options_accord])
                    with gr.Row(variant='panel'):
                        soft_edges = gr.Checkbox(label='Soft edges', value=True, interactive=True, scale=1)
                        soft_edge_kernel_size = gr.Slider(label='Soft edge kernel size', minimum=21, maximum=49,  value=35, step=2, interactive=True, visible=True, scale=2)
                    def change_soft_edges(soft_edges):
                        return gr.Slider(visible=True if soft_edges else False), gr.Accordion(open=True)
                    soft_edges.change(change_soft_edges, soft_edges, [soft_edge_kernel_size, options_accord])
                submit_btn = gr.Button('Submit')
            output_image = gr.Image(label='Censored', show_download_button=True)

        submit_btn.click(
            fn=add_censorship,
            inputs=[input_image, mode, pixelation_block_size, blur_kernel_size, soft_edges, soft_edge_kernel_size],
            outputs=output_image
        )
        gr.Examples(
            examples=add_censor_examples,
            fn=add_censorship,
            inputs=[input_image, mode, pixelation_block_size, blur_kernel_size, soft_edges, soft_edge_kernel_size],
            outputs=output_image,
            cache_examples=False,
        )

    with gr.Tab('Remove censorship'):
        with gr.Row():
            with gr.Column():
                input_image = gr.ImageEditor()
                use_cd = gr.Checkbox(label='Use Consistency Decoder (slower)')
                with gr.Accordion('Manual cropping', open=False):
                    with gr.Row():
                        with gr.Row():
                            x1 = gr.Number(value=0, label='x1')
                            y1 = gr.Number(value=0, label='y1')
                        with gr.Row():
                            x2_ = gr.Number(value=10000, label='x2', interactive=False, elem_classes='my-disabled')
                            y1_ = gr.Number(value=0, label='y1', interactive=False, elem_classes='my-disabled')
                    with gr.Row():
                        with gr.Row():
                            x1_ =gr.Number(value=0, label='x1', elem_classes='my-disabled')
                            y2_ = gr.Number(value=10000, label='y2', elem_classes='my-disabled')
                        with gr.Row():
                            x2 = gr.Number(value=10000, label='x2')
                            y2 = gr.Number(value=10000, label='y2')
                submit_btn = gr.Button('Submit')
            output_image = gr.Image(label='Uncensored')

        submit_btn.click(
            fn=remove_censorship,
            inputs=[input_image, use_cd, x1, y1, x2, y2],
            outputs=output_image
        )
        gr.Examples(
            examples=remove_censor_examples,
            fn=remove_censorship,
            inputs=[input_image, use_cd, x1, y1, x2, y2],
            outputs=output_image,
            cache_examples=False,
        )

        # sync coordinate on changed
        x1.change(lambda x : x, x1, x1_)
        x2.change(lambda x : x, x2, x2_)
        y1.change(lambda x : x, y1, y1_)
        y2.change(lambda x : x, y2, y2_)


if __name__ == '__main__':
    demo.queue(4)
    demo.launch()