# Requirements.txt
from torch import cuda
from transformers import T5Tokenizer, T5ForConditionalGeneration
import gradio as gr
from utils import convert_ans_to_token, convert_ques_to_token, rotate, convert_token_to_ques, convert_token_to_answer
from modeling import LaTr_for_pretraining, LaTr_for_finetuning, LaTrForVQA
from dataset import load_json_file, get_specific_file, resize_align_bbox, get_tokens_with_boxes, create_features
import torch.nn as nn
from PIL import Image, ImageDraw
import pytesseract
from tqdm.auto import tqdm
import numpy as np
import json
import os
import torch
from torchvision import transforms


# install PyTesseract
os.system('pip install -q pytesseract')
os.environ["TOKENIZERS_PARALLELISM"] = "false"


# Default Library import
# Visualization libraries

# Specific libraries of LaTr

# Setting the hyperparameters as well as primary configurations

PAD_TOKEN_BOX = [0, 0, 0, 0]
max_seq_len = 512
batch_size = 2
target_size = (500, 384)
t5_model = "t5-base"


device = 'cuda' if cuda.is_available() else 'cpu'


# Configuration for the model
config = {
    't5_model': 't5-base',
    'vocab_size': 32128,
    'hidden_state': 768,
    'max_2d_position_embeddings': 1001,
    'classes': 32128,  # number of tokens
    'seq_len': 512
}

tokenizer = T5Tokenizer.from_pretrained(t5_model)
latr = LaTrForVQA(config)
url = 'https://www.kaggleusercontent.com/kf/99663112/eyJhbGciOiJkaXIiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0..tGHcmnLDazeyRNWAxV-KDQ.6unLNRwl7AyVy0Qz3ONE1m_mRNmgC-8VGyS61PdkSeBMV7PpG2B1cD5liuLlok5LQiYrGujrULdtIXKTqCUU_PA3MMSRhi1VKkGMdtrzJLMvzA4jxlWh_qak8P89w4ir4LENyuPCan24M0MOLXYjrm4d1iiy4Hg8pp2o5zWgs0OrVYoh_AJNazOD7pRIjLEAqnM-Pa0LSmvJkfN7j3Zn_Fu9jJ7Pq3Z0rWVtEb-PbeY06f9t-0QK6-JU8K2LdQjuBaCxjgB3BlufgFhKuhU3CZXsJitG7tDnwMSl4JImGfMmBntE2kn9-0dl_aANxaQd2Lsy8KGUDNAdQ2vBpowGQ0-tgDT_w7DpG6DzmUlmzIegqJF1-JyurCO0TrX_RatoPa7jGzuqA5vUT4263-MkoAlR0Xuulq4_pwGV-WnJsrcLuuDtEKFVsYjQvikWM3c9Arw0MsXchYCQkl_OZ6ZqYZ6TZrYxujHE2B6nHxu0F-5xj33vQ2ojaMpHtDplTnqCe4TdmzRWV6LhopfL4x1NXIXry8we4IqgPPwnIy3G2lZVR39nPmNR-8IGjbvweVr6Ci6y1COdbLR4JiTMVc_Nvf2glVKRjppTdcEwLv-j1YR8JsZpZvjaOEokrNkyCG7J0PLJAHlY8iX-pRdBG4vivbSHxnKl3Qppa689VH0RARpOsOBYv-IF-rM1nSmKq7Ci.tXi1B0oNQFlUtxesMcma3w/models/epoch=0-step=34602.ckpt'


try:
    latr = latr.load_from_checkpoint(url)
    print("Checkpoint loaded successfully")
except:
    print("Checkpoint not loaded")
    pass


image = gr.inputs.Image(type="pil")
question = gr.inputs.Textbox(label="Question")
answer = gr.outputs.Textbox(label="Predicted answer")
examples = [["remote.jpg", "what number is the button near the top left?"]]


from transformers import ViTFeatureExtractor, ViTModel
vit_feat_extract = ViTFeatureExtractor("google/vit-base-patch16-224-in21k")

import torchvision
import numpy as np

def answer_question(image, question):

    # Extracting features from the image
    image.save("sample.png")
    img, boxes, tokenized_words = create_features("sample.png",
                                                  tokenizer=tokenizer,
                                                  target_size=target_size,
                                                  max_seq_length=max_seq_len,
                                                  use_ocr=True
                                                  )

    ## Converting the boxes as per the format required for model input
    boxes = torch.as_tensor(boxes, dtype=torch.int32)
    width = (boxes[:, 2] - boxes[:, 0]).view(-1, 1)
    height = (boxes[:, 3] - boxes[:, 1]).view(-1, 1)
    boxes = torch.cat([boxes, width, height], axis = -1)

    ## Clamping the value,as some of the box values are out of bound
    boxes[:, 0] = torch.clamp(boxes[:, 0], min = 0, max = 0)
    boxes[:, 2] = torch.clamp(boxes[:, 2], min = 1000, max = 1000)
    boxes[:, 4] = torch.clamp(boxes[:, 4], min = 1000, max = 1000)
    
    boxes[:, 1] = torch.clamp(boxes[:, 1], min = 0, max = 0)
    boxes[:, 3] = torch.clamp(boxes[:, 3], min = 1000, max = 1000)
    boxes[:, 5] = torch.clamp(boxes[:, 5], min = 1000, max = 1000)

    ## Tensor tokenized words
    tokenized_words = torch.as_tensor(tokenized_words, dtype=torch.int32)    
    img = np.array(img)
    img = torchvision.transforms.ToTensor()(img)
    question = convert_ques_to_token(question = question, tokenizer = tokenizer)

    ## Expanding the dimension for inference
    boxes = boxes.unsqueeze(0)
    tokenized_words = tokenized_words.unsqueeze(0)
    question = question.unsqueeze(0)

    img = vit_feat_extract(img, return_tensors = 'pt')['pixel_values']
    if int(len(img.shape)) == 3:
      img = img.unsqueeze(0)

    encoding = {'img': img, 'boxes': boxes, 'tokenized_words': tokenized_words, 'question': question}
    
    with torch.no_grad():
        logits = latr.forward(encoding)
        logits = logits.squeeze(0)

    _, preds = torch.max(logits, dim = 1)
    preds = preds.detach().cpu()
    mask = torch.clamp(preds, min = 0, max = 1)
    last_non_zero_argument = (mask != 0).nonzero()[1][-1]
    
    predicted_ans = convert_token_to_ques(preds[:last_non_zero_argument], tokenizer)
    return predicted_ans


# Taken from here: https://huggingface.co/spaces/nielsr/vilt-vqa/blob/main/app.py
title = "Interactive demo: laTr (Layout Aware Transformer) for VQA"
description = "Gradio Demo for LaTr (Layout Aware Transformer),trained on TextVQA Dataset. To use it, simply upload your image and type a question and click 'submit', or click one of the examples to load them. Read more at the links below."
article = "<p style='text-align: center'><a href='https://arxiv.org/abs/2112.12494' target='_blank'>LaTr: Layout-aware transformer for scene-text VQA,a novel multimodal architecture for Scene Text Visual Question Answering (STVQA)</a> | <a href='https://github.com/uakarsh/latr' target='_blank'>Github Repo</a></p>"
examples = [['remote.png', "what number is the button near the top left?"]]

interface = gr.Interface(fn=answer_question,
                         inputs=[image, question],
                         outputs=answer,
                         examples=examples,
                         title=title,
                         description=description,
                         article=article,
                         enable_queue=True)
interface.launch(debug=True)