import gradio as gr
from pathlib import Path
import os
from PIL import Image
import torch
import torchvision.transforms as transforms
import requests

# Function to download the model from Google Drive
def download_file_from_google_drive(id, destination):
    URL = "https://drive.google.com/uc?export=download"
    session = requests.Session()
    response = session.get(URL, params={'id': id}, stream=True)
    token = get_confirm_token(response)

    if token:
        params = {'id': id, 'confirm': token}
        response = session.get(URL, params=params, stream=True)

    save_response_content(response, destination)

def get_confirm_token(response):
    for key, value in response.cookies.items():
        if key.startswith('download_warning'):
            return value
    return None

def save_response_content(response, destination):
    CHUNK_SIZE = 32768
    with open(destination, "wb") as f:
        for chunk in response.iter_content(CHUNK_SIZE):
            if chunk:  # filter out keep-alive new chunks
                f.write(chunk)

# Replace 'YOUR_FILE_ID' with your actual file ID from Google Drive
file_id = '1WJ33nys02XpPDsMO5uIZFiLqTuAT_iuV'
destination = 'ema_ckpt_cond.pt'
download_file_from_google_drive(file_id, destination)

# Preprocessing
from modules import PaletteModelV2
from diffusion import Diffusion_cond

device = 'cuda'

model = PaletteModelV2(c_in=2, c_out=1, num_classes=5, image_size=256, true_img_size=64).to(device)
ckpt = torch.load(destination, map_location=device)
model.load_state_dict(ckpt)

diffusion = Diffusion_cond(noise_steps=1000, img_size=256, device=device)
model.eval()

transform_hmi = transforms.Compose([
    transforms.ToTensor(),
    transforms.Resize((256, 256)),
    transforms.RandomVerticalFlip(p=1.0),
    transforms.Normalize(mean=(0.5,), std=(0.5,))
])

def generate_image(seed_image):
    seed_image_tensor = transform_hmi(Image.open(seed_image)).reshape(1, 1, 256, 256).to(device)
    generated_image = diffusion.sample(model, y=seed_image_tensor, labels=None, n=1)
    generated_image_pil = transforms.ToPILImage()(generated_image.squeeze().cpu())
    return generated_image_pil

# Create Gradio interface
iface = gr.Interface(
    fn=generate_image,
    inputs="file",
    outputs="image",
    title="Magnetogram-to-Magnetogram: Generative Forecasting of Solar Evolution",
    description="Upload a LoS magnetogram and predict how it is going to be in 24 hours."
)

iface.launch()