import sys
import os
import requests

import torch
import numpy as np

import matplotlib.pyplot as plt
from PIL import Image
import gradio as gr


os.system("pip install timm==0.4.5")
os.system("git clone https://github.com/facebookresearch/mae.git")
sys.path.append('./mae')

import models_mae

# define the utils

imagenet_mean = np.array([0.485, 0.456, 0.406])
imagenet_std = np.array([0.229, 0.224, 0.225])

def show_image(image, title=''):
    # image is [H, W, 3]
    assert image.shape[2] == 3
    plt.imshow(torch.clip((image * imagenet_std + imagenet_mean) * 255, 0, 255).int())
    plt.title(title, fontsize=16)
    plt.axis('off')
    return

def prepare_model(chkpt_dir, arch='mae_vit_large_patch16'):
    # build model
    model = getattr(models_mae, arch)()
    # load model
    checkpoint = torch.load(chkpt_dir, map_location='cpu')
    msg = model.load_state_dict(checkpoint['model'], strict=False)
    print(msg)
    return model

def run_one_image(img, model):
    x = torch.tensor(img)

    # make it a batch-like
    x = x.unsqueeze(dim=0)
    x = torch.einsum('nhwc->nchw', x)

    # run MAE
    loss, y, mask = model(x.float(), mask_ratio=0.75)
    y = model.unpatchify(y)
    y = torch.einsum('nchw->nhwc', y).detach().cpu()

    # visualize the mask
    mask = mask.detach()
    mask = mask.unsqueeze(-1).repeat(1, 1, model.patch_embed.patch_size[0]**2 *3)  # (N, H*W, p*p*3)
    mask = model.unpatchify(mask)  # 1 is removing, 0 is keeping
    mask = torch.einsum('nchw->nhwc', mask).detach().cpu()
    
    x = torch.einsum('nchw->nhwc', x)

    # masked image
    im_masked = x * (1 - mask)

    # MAE reconstruction pasted with visible patches
    im_paste = x * (1 - mask) + y * mask

    # make the plt figure larger
    plt.rcParams['figure.figsize'] = [24, 24]

    plt.subplot(1, 4, 1)
    show_image(x[0], "original")

    plt.subplot(1, 4, 2)
    show_image(im_masked[0], "masked")

    plt.subplot(1, 4, 3)
    show_image(y[0], "reconstruction")

    plt.subplot(1, 4, 4)
    show_image(im_paste[0], "reconstruction + visible")

    plt.show()
    

# download checkpoint if not exist
os.system("wget -nc https://dl.fbaipublicfiles.com/mae/visualize/mae_visualize_vit_large.pth")

chkpt_dir = 'mae_visualize_vit_large.pth'
model_mae = prepare_model(chkpt_dir, 'mae_vit_large_patch16')
print('Model loaded.')

    
def inference(img):    
  img = img.resize((224, 224))
  img = np.array(img) / 255.
  
  assert img.shape == (224, 224, 3)
  
  # normalize by ImageNet mean and std
  img = img - imagenet_mean
  img = img / imagenet_std
  
  
  torch.manual_seed(2)
  return run_one_image(img, model_mae)
  

title = "MAE"
description = "Gradio Demo for MAE. To use it, simply upload your image, or click one of the examples to load them. Read more at the links below."

article = "<p style='text-align: center'><a href='https://arxiv.org/abs/2112.11641' target='_blank'>JoJoGAN: One Shot Face Stylization</a>| <a href='https://github.com/mchong6/JoJoGAN' target='_blank'>Github Repo Pytorch</a></p> <center><img src='https://visitor-badge.glitch.me/badge?page_id=akhaliq_jojogan' alt='visitor badge'></center>"


gr.Interface(inference, [gr.inputs.Image(type="pil")], gr.outputs.Image(type="plot"),title=title,description=description,article=article,allow_flagging=False,examples=examples,allow_screenshot=False,enable_queue=True).launch()