from transformers import ViTConfig, ViTForImageClassification
from transformers import ViTFeatureExtractor
from PIL import Image
import requests
import matplotlib.pyplot as plt
import gradio as gr
from transformers import ImageClassificationPipeline, PerceiverForImageClassificationConvProcessing, PerceiverFeatureExtractor
from transformers import VisionEncoderDecoderModel
from transformers import AutoTokenizer
import torch


# option 1: load with randomly initialized weights (train from scratch)

config = ViTConfig(num_hidden_layers=12, hidden_size=768)
model = ViTForImageClassification(config)

#print(config)

feature_extractor = ViTFeatureExtractor()
# or, to load one that corresponds to a checkpoint on the hub:
#feature_extractor = ViTFeatureExtractor.from_pretrained("google/vit-base-patch16-224")

#the following gets called by classify_image() 
feature_extractor = PerceiverFeatureExtractor.from_pretrained("deepmind/vision-perceiver-conv")
model = PerceiverForImageClassificationConvProcessing.from_pretrained("deepmind/vision-perceiver-conv")

image_pipe = ImageClassificationPipeline(model=model, feature_extractor=feature_extractor)

'''


# initialize a vit-bert from a pretrained ViT and a pretrained BERT model. Note that the cross-attention layers will be randomly initialized
model = VisionEncoderDecoderModel.from_encoder_decoder_pretrained(
    "google/vit-base-patch16-224-in21k", "bert-base-uncased"
)
# saving model after fine-tuning
model.save_pretrained("./vit-bert")
# load fine-tuned model
model = VisionEncoderDecoderModel.from_pretrained("./vit-bert")


'''

repo_name = "ydshieh/vit-gpt2-coco-en"
#test_image = "cats.jpg"
url = 'http://images.cocodataset.org/val2017/000000039769.jpg'
test_image = Image.open(requests.get(url, stream=True).raw)
test_image.save("cats.png")
feature_extractor2 = ViTFeatureExtractor.from_pretrained(repo_name)
tokenizer = AutoTokenizer.from_pretrained(repo_name)
model2 = VisionEncoderDecoderModel.from_pretrained(repo_name)
pixel_values = feature_extractor2(test_image, return_tensors="pt").pixel_values
print("Pixel Values")
print(pixel_values)
# autoregressively generate text (using beam search or other decoding strategy)
generated_ids = model2.generate(pixel_values, max_length=16, num_beams=4, return_dict_in_generate=True)
# decode into text
preds = tokenizer.batch_decode(generated_ids[0], skip_special_tokens=True)
preds = [pred.strip() for pred in preds]
print("Predictions")
print(preds)



def classify_image(image):
  results = image_pipe(image)
  
  print("RESULTS")
  print(results)
  # convert to format Gradio expects
  output = {}
  for prediction in results:
    predicted_label = prediction['label']
    score = prediction['score']
    output[predicted_label] = score
  print("OUTPUT")
  print(output)
  return output


image = gr.inputs.Image(type="pil")
image_piped = ""
label = gr.outputs.Label(num_top_classes=5)
examples = [["cats.jpg"], ["dog.jpg"]]
title = "Generate a Story from an Image"
description = "Demo for classifying images with Perceiver IO. To use it, simply upload an image and click 'submit' to let the model predict the 5 most probable ImageNet classes. Results will show up in a few seconds."  + image_piped
article = "<p style='text-align: center'></p>"

gr.Interface(fn=classify_image, inputs=image, outputs=label, title=title, description=description, examples="", enable_queue=True).launch(debug=True)