import re
import gradio as gr

from transformers import DonutProcessor, VisionEncoderDecoderModel
import torch

processor = DonutProcessor.from_pretrained("naver-clova-ix/donut-base-finetuned-docvqa")
model = VisionEncoderDecoderModel.from_pretrained("naver-clova-ix/donut-base-finetuned-docvqa")
device = "cuda" if torch.cuda.is_available() else "cpu"
model.to(device)


def doc_process(image,question):
    # prepare decoder inputs
    task_prompt = "<s_docvqa><s_question>{user_input}</s_question><s_answer>"
    prompt = task_prompt.replace("{user_input}", question)
    decoder_input_ids = processor.tokenizer(prompt, add_special_tokens=False, return_tensors="pt").input_ids
    
    pixel_values = processor(image, return_tensors="pt").pixel_values
    
    
    outputs = model.generate(
    pixel_values.to(device),
    decoder_input_ids=decoder_input_ids.to(device),
    max_length=model.decoder.config.max_position_embeddings,
    early_stopping=True,
    pad_token_id=processor.tokenizer.pad_token_id,
    eos_token_id=processor.tokenizer.eos_token_id,
    use_cache=True,
    num_beams=1,
    bad_words_ids=[[processor.tokenizer.unk_token_id]],
    return_dict_in_generate=True,
    )
    
    sequence = processor.batch_decode(outputs.sequences)[0]
    sequence = sequence.replace(processor.tokenizer.eos_token, "").replace(processor.tokenizer.pad_token, "")
    sequence = re.sub(r"<.*?>", "", sequence, count=1).strip()  # remove first task start token
    #print(processor.token2json(sequence))
    return processor.token2json(sequence)
    
description = "Gradio Demo for Donut 🍩, inspired by Nielsr demo"

article = "<p style='text-align: center'><a href='https://arxiv.org/abs/2111.15664' target='_blank'>Donut: OCR-free Document Understanding Transformer</a> | <a href='https://github.com/clovaai/donut' target='_blank'>Github Repo</a></p>"

demo = gr.Interface(
    fn= doc_process,
    inputs=["image", "text"],
    outputs="json",
    title="Donut 🍩 for DocVQA",
    description=description,
    article=article,
    enable_queue=True,
    examples=[["example_1.png", "What is date of birth?"], ["example_1.png", "What is Patient initials?"]],
    cache_examples=False)

demo.launch()