import numpy as np
import gradio as gr
import torch
import torch.nn as nn
import torch.nn.functional as F
from model import SRCNNModel, pred_SRCNN
from PIL import Image


title = "Super Resolution with CNN"
description = """

Your low resolution image will be reconstructed to high resolution with a scale of 2 with a convolutional neural network!<br>
CNN output on the left, bicubic interpolation output on the right.<br>
Training and dataset can be found on my [github page](https://github.com/susuhu/super-resolution/blob/main/Super_Resolution.ipynb).<br>

"""

article = "Check out the origianl [paper](https://arxiv.org/abs/1501.00092) proposed by Dong *et al*."

# load model
print("Loading  SRCNN model...")
device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')

model = SRCNNModel().to(device)
model.load_state_dict(torch.load('SRCNNmodel_trained.pt',map_location=torch.device(device) ))
model.eval()
print("SRCNN model loaded!")

# def image_grid(imgs, rows, cols):
#     '''
#     imgs:list of PILImage
#     '''
#     assert len(imgs) == rows*cols

#     w, h = imgs[0].size
#     grid = Image.new('RGB', size=(cols*w, rows*h))
#     grid_w, grid_h = grid.size
    
#     for i, img in enumerate(imgs):
#         grid.paste(img, box=(i%cols*w, i//cols*h))
#     return grid

def sepia(image):
    # gradio open image as np array
    image = Image.fromarray(image,mode='RGB')
    out_final,image_bicubic,image = pred_SRCNN(model=model,image=image,device=device)
    # grid = image_grid([out_final,image_bicubic],1,2)
    return out_final,image_bicubic

demo = gr.Interface(fn = sepia, inputs=gr.inputs.Image(label="Upload image"), [gr.outputs.Image(label="Conv net"), gr.outputs.Image(label="Bicubic interpoloation")],title=title,description = description,article = article,examples=[['LR_image.png'],['barbara.png']])

demo.launch()