import gradio as gr
import torch
from PIL import Image
from torchvision import transforms
import warnings
import sys
import os
import contextlib
from transformers import ViTForImageClassification

# Suppress warnings related to the model weights initialization
warnings.filterwarnings("ignore", category=UserWarning, message=".*weights.*")
warnings.filterwarnings("ignore", category=FutureWarning, module="torch")

# Suppress output for copying files and verbose model initialization messages
@contextlib.contextmanager
def suppress_stdout():
    with open(os.devnull, 'w') as devnull:
        old_stdout = sys.stdout
        sys.stdout = devnull
        try:
            yield
        finally:
            sys.stdout = old_stdout

# Load the saved model and suppress the warnings
with suppress_stdout():
    model = ViTForImageClassification.from_pretrained('google/vit-base-patch16-224-in21k', num_labels=6)
    model.load_state_dict(torch.load('vit_sugarcane_disease_detection.pth', map_location=torch.device('cpu')))
    model.eval()

# Define the same transformation used during training
transform = transforms.Compose([
    transforms.Resize((224, 224)),
    transforms.ToTensor(),
    transforms.Normalize(mean=[0.485, 0.456, 0.406], std=[0.229, 0.224, 0.225]),
])

# Load the class names (disease types)
class_names = ['BacterialBlights', 'Healthy', 'Mosaic', 'RedRot', 'Rust', 'Yellow']

# Function to predict disease type from an image
def predict_disease(image):
    # Apply transformations to the image
    img_tensor = transform(image).unsqueeze(0)  # Add batch dimension

    # Make prediction
    with torch.no_grad():
        outputs = model(img_tensor)
        _, predicted_class = torch.max(outputs.logits, 1)
    
    # Get the predicted label
    predicted_label = class_names[predicted_class.item()]
    
    return predicted_label

# Create Gradio interface
inputs = gr.Image(type="pil")
outputs = gr.Text()

EXAMPLES = ["bacterialblight.jpeg"]

demo_app = gr.Interface(
    fn=predict_disease,
    inputs=inputs,
    outputs=outputs,
    title="Sugarcane Disease Detection",
    examples=EXAMPLES,
    live=True,
    theme="huggingface"
)

demo_app.launch(debug=True)