import os
import yaml
import torch
import argparse
import numpy as np
import gradio as gr

from PIL import Image
from copy import deepcopy
from torch.nn.parallel import DataParallel, DistributedDataParallel

from huggingface_hub import hf_hub_download
from gradio_imageslider import ImageSlider

## local code
from models import seemore


def dict2namespace(config):
    namespace = argparse.Namespace()
    for key, value in config.items():
        if isinstance(value, dict):
            new_value = dict2namespace(value)
        else:
            new_value = value
        setattr(namespace, key, new_value)
    return namespace

def load_img (filename, norm=True,):
    img = np.array(Image.open(filename).convert("RGB"))
    h, w = img.shape[:2]
    
    if w > 1920 or h > 1080:
        new_h, new_w = h // 4, w // 4
        img = np.array(Image.fromarray(img).resize((new_w, new_h), Image.BICUBIC))
 
    if norm:
        img = img / 255.
        img = img.astype(np.float32)
    return img

def process_img (image):
    img = np.array(image)
    img = img / 255.
    img = img.astype(np.float32)
    y = torch.tensor(img).permute(2,0,1).unsqueeze(0).to(device)
    
    with torch.no_grad():
        x_hat = model(y)

    restored_img = x_hat.squeeze().permute(1,2,0).clamp_(0, 1).cpu().detach().numpy()
    restored_img = np.clip(restored_img, 0. , 1.)

    restored_img = (restored_img * 255.0).round().astype(np.uint8)  # float32 to uint8
    #return Image.fromarray(restored_img) #
    return (image, Image.fromarray(restored_img))

def load_network(net, load_path, strict=True, param_key='params'):
    if isinstance(net, (DataParallel, DistributedDataParallel)):
        net = net.module
    load_net = torch.load(load_path, map_location=lambda storage, loc: storage)
    if param_key is not None:
        if param_key not in load_net and 'params' in load_net:
            param_key = 'params'
        load_net = load_net[param_key]
    # remove unnecessary 'module.'
    for k, v in deepcopy(load_net).items():
        if k.startswith('module.'):
            load_net[k[7:]] = v
            load_net.pop(k)
    net.load_state_dict(load_net, strict=strict)

CONFIG = "configs/eval_seemore_t_x4.yml"
hf_hub_download(repo_id="eduardzamfir/SeemoRe-T", filename="SeemoRe_T_X4.pth", local_dir="./")
MODEL_NAME = "SeemoRe_T_X4.pth"

# parse config file
with open(os.path.join(CONFIG), "r") as f:
    config = yaml.safe_load(f)

cfg = dict2namespace(config)

device = torch.device("cpu")
model = seemore.SeemoRe(scale=cfg.model.scale, in_chans=cfg.model.in_chans,
                        num_experts=cfg.model.num_experts, num_layers=cfg.model.num_layers, embedding_dim=cfg.model.embedding_dim, 
                        img_range=cfg.model.img_range, use_shuffle=cfg.model.use_shuffle, global_kernel_size=cfg.model.global_kernel_size, 
                        recursive=cfg.model.recursive, lr_space=cfg.model.lr_space, topk=cfg.model.topk)

model = model.to(device)
print ("IMAGE MODEL CKPT:", MODEL_NAME)
load_network(model, MODEL_NAME, strict=True, param_key='params')

title = "Online Image Enhancer - Free Upscale & Enhancement"

description = '''

Experience the power of our advanced image enhancement model! Upscale and enhance your images online for free. 
Simply upload an image to see the transformation.
'''

article = "<p style='text-align: center'>See More Details: Efficient Image Super-Resolution by Experts Mining</a></p>"

#### Image,Prompts examples
examples = [
            ['images/0801x4.png'],
            ['images/0840x4.png'],
            ['images/0841x4.png'],
            ['images/0870x4.png'],
            ['images/0878x4.png'],
            ['images/0884x4.png'],
            ['images/0900x4.png'],
            ['images/img002x4.png'],
            ['images/img003x4.png'],
            ['images/img004x4.png'],
            ['images/img035x4.png'],
            ['images/img053x4.png'],
            ['images/img064x4.png'],
            ['images/img083x4.png'],
            ['images/img092x4.png'],
            ]

css = """
    .image-frame img, .image-container img {
        width: auto;
        height: auto;
        max-width: none;
    }
"""

demo = gr.Interface(
    fn=process_img,
    inputs=[gr.Image(type="pil", label="Input", value="images/0878x4.png"),],
    outputs=ImageSlider(label="Super-Resolved Image", 
                        type="pil",
                        show_download_button=True,
                        ), #[gr.Image(type="pil", label="Ouput", min_width=500)],
    title=title,
    description=description,
    article=article,
    examples=examples,
    css=css,
)

if __name__ == "__main__":
    demo.launch()