import torch #needed only for GPU
from PIL import Image
from io import BytesIO
import numpy as np
from diffusers import StableDiffusionLatentUpscalePipeline, StableDiffusionUpscalePipeline
import gradio as gr
import modin.pandas as pd

# load model for CPU or GPU

model_2x = "stabilityai/sd-x2-latent-upscaler"
model_4x = "stabilityai/stable-diffusion-x4-upscaler"
device = "cuda" if torch.cuda.is_available() else "cpu"
upscaler2x = StableDiffusionLatentUpscalePipeline.from_pretrained(model_2x, torch_dtype=torch.float16, revision="fp16") if torch.cuda.is_available() else StableDiffusionLatentUpscalePipeline.from_pretrained(model_2x, safety_checker=None)
upscaler4x = StableDiffusionUpscalePipeline.from_pretrained(model_4x, torch_dtype=torch.float16, revision="fp16") if torch.cuda.is_available() else StableDiffusionUpscalePipeline.from_pretrained(model_4x)

#define interface 

def upscale(raw_img, model, prompt, negative_prompt, scale, steps):
    generator = torch.manual_seed(999999)
    low_res_img = Image.open(raw_img).convert("RGB")
    if model == "Upscaler 4x": 
        low_res_img = low_res_img.resize((128, 128)) 
    else: 
        low_res_img
    image = upscaler2x(prompt=prompt, negative_prompt=negative_prompt, image=low_res_img, guidance_scale=scale, num_inference_steps=steps).images[0] if model == "Upscaler 2x" else upscaler4x(prompt=prompt, negative_prompt=negative_prompt, image=low_res_img, guidance_scale=scale, num_inference_steps=steps).images[0]
    return image
    
#launch interface
    
gr.Interface(fn=upscale, inputs=[
    gr.Image(type="filepath", label='Lower Resolution Image'), 
    gr.Radio(['Upscaler 2x','Upscaler 4x'], label="Models"),
    gr.Textbox(label="Optional: Enter a Prompt to Slightly Guide the AI's Enhancement"), 
    gr.Textbox(label='Experimental: Slightly influence What you do not want the AI to Enhance.'), 
    gr.Slider(2, 15, 7, step=1, label='Guidance Scale: How much the AI influences the Upscaling.'), 
    gr.Slider(5, 25, 10, step=1, label='Number of Iterations')], 
    outputs=gr.Image(type="filepath", label = 'Upscaled Image'), 
    title='SD Upscaler', 
    description='2x Latent Upscaler using SD 2.0 And 4x Upscaler using SD 2.1. This version runs on CPU or GPU and is currently running on a T4 GPU. For 4x Upscaling use images lower than 512x512. For 2x Upscaling use 512x512 to 768x768 images.<br><br><b>Notice: Largest Accepted Resolution is 768x768', 
    article = "Code Monkey: <a href=\"https://huggingface.co/Manjushri\">Manjushri</a>").launch(max_threads=True, debug=True)