import torch
from PIL import Image
from RealESRGAN import RealESRGAN
import gradio as gr

device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
model2 = RealESRGAN(device, scale=2)
model2.load_weights('weights/RealESRGAN_x2.pth', download=True)
model4 = RealESRGAN(device, scale=4)
model4.load_weights('weights/RealESRGAN_x4.pth', download=True)
model8 = RealESRGAN(device, scale=8)
model8.load_weights('weights/RealESRGAN_x8.pth', download=True)


def inference(image, size):
    global model2
    global model4
    global model8
    if image is None:
        raise gr.Error("Image not uploaded")
        

    if torch.cuda.is_available():
        torch.cuda.empty_cache()
    
    if size == '2x':
        try:
            result = model2.predict(image.convert('RGB'))
        except torch.cuda.OutOfMemoryError as e:
            print(e)
            model2 = RealESRGAN(device, scale=2)
            model2.load_weights('weights/RealESRGAN_x2.pth', download=False)
            result = model2.predict(image.convert('RGB'))
    elif size == '4x':
        try:
            result = model4.predict(image.convert('RGB'))
        except torch.cuda.OutOfMemoryError as e:
            print(e)
            model4 = RealESRGAN(device, scale=4)
            model4.load_weights('weights/RealESRGAN_x4.pth', download=False)
            result = model2.predict(image.convert('RGB'))
    else:
        try:
            width, height = image.size
            if width >= 5000 or height >= 5000:
                raise gr.Error("The image is too large.")
            result = model8.predict(image.convert('RGB'))
        except torch.cuda.OutOfMemoryError as e:
            print(e)
            model8 = RealESRGAN(device, scale=8)
            model8.load_weights('weights/RealESRGAN_x8.pth', download=False)
            result = model2.predict(image.convert('RGB'))
            
    print(f"Image size ({device}): {size} ... OK")
    return result


title = "Face Real ESRGAN UpScale: 2x 4x 8x"
description = "This is an unofficial demo for Real-ESRGAN. Scales the resolution of a photo. This model shows better results on faces compared to the original version.<br>Telegram BOT: https://t.me/restoration_photo_bot"
article = "<div style='text-align: center;'>Twitter <a href='https://twitter.com/DoEvent' target='_blank'>Max Skobeev</a> | <a href='https://huggingface.co/sberbank-ai/Real-ESRGAN' target='_blank'>Model card</a><div>"


gr.Interface(inference,
    [gr.Image(type="pil"), 
    gr.Radio(["2x", "4x", "8x"], 
    type="value",
    value="2x",
    label="Resolution model")], 
    gr.Image(type="pil", label="Output", format="png"),
    title=title,
    description=description,
    article=article,
    examples=[["groot.jpeg", "2x"]],
    allow_flagging="never",
    cache_examples="lazy",
    delete_cache=(44000, 44000),
    ).queue(api_open=True).launch(show_error=True, show_api=True)