import gradio as gr
from fastai.vision.all import *
import pathlib

# Fix for windows path run time issue
temp = pathlib.PosixPath
pathlib.WindowsPath = pathlib.PosixPath

# Label function
def is_cat(x:string): return x[0].isupper()

def get_data():
    # Read the dataset from fastai
    path = untar_data(URLs.PETS)/'images'
    return ImageDataLoaders.from_name_func(
        path,get_image_files(path), valid_pct=0.2, seed=42,
        label_func=is_cat, item_tfms=Resize(224))
    
if __name__ == '__main__':
    # This is required for windows users
    # multiprocessing.set_start_method('spawn')
    dls = get_data() 

    # Since the model is already trained, I have commented out the code to train it
    
    # Train the model with vision_learner
    # learn = vision_learner(dls, resnet34, metrics=error_rate)
    # learn.fine_tune(1)

    # #Export the model
    # learn.path = Path('.')
    # learn.export(
    #     'cats_classifier.pkl'
    # )

    model = load_learner('cats_classifier.pkl')

    def predict(image):
        img = PILImage.create(image)
        pred,pred_idx,probs = model.predict(img)
        return f"Probability it's a cat: {probs[1].item():.6f}" 

    demo = gr.Interface(fn=model.predict, inputs="image", outputs='text')
    demo.launch()