import gradio as gr

import torch
import numpy as np
from transformers import AutoTokenizer
from src.modeling.modeling_bert import BertForSequenceClassification
from src.modeling.modeling_electra import ElectraForSequenceClassification
from src.attention_rollout import AttentionRollout

import seaborn as sns
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.gridspec as gridspec
import matplotlib.backends.backend_pdf

def inference(text, model):
  if model == "bert-base-uncased-cls-sst2":
    config = {
        # As of now, BERT and ELECTRA are supported. You can choose any checkpoing of these models.
        ### BERT-base
        "MODEL": "TehranNLP-org/bert-base-uncased-cls-sst2"
        # "MODEL": "TehranNLP-org/bert-base-uncased-cls-mnli"
        # "MODEL": "TehranNLP-org/bert-base-uncased-cls-hatexplain"
        ### BERT-large
        # "MODEL": "TehranNLP-org/bert-large-sst2"
        # "MODEL": "TehranNLP-org/bert-large-mnli"
        # "MODEL": "TehranNLP-org/bert-large-hateXplain"
        ### ELECTRA
        # "MODEL": "TehranNLP-org/electra-base-sst2"
        # "MODEL": "TehranNLP-org/electra-base-mnli"
        # "MODEL": "TehranNLP-org/electra-base-hateXplain"
    }
  elif model == "bert-large-sst2":
    config = {
        # As of now, BERT and ELECTRA are supported. You can choose any checkpoing of these models.
        ### BERT-base
        #"MODEL": "TehranNLP-org/bert-base-uncased-cls-sst2"
        # "MODEL": "TehranNLP-org/bert-base-uncased-cls-mnli"
        # "MODEL": "TehranNLP-org/bert-base-uncased-cls-hatexplain"
        ### BERT-large
        "MODEL": "TehranNLP-org/bert-large-sst2"
        # "MODEL": "TehranNLP-org/bert-large-mnli"
        # "MODEL": "TehranNLP-org/bert-large-hateXplain"
        ### ELECTRA
        # "MODEL": "TehranNLP-org/electra-base-sst2"
        # "MODEL": "TehranNLP-org/electra-base-mnli"
        # "MODEL": "TehranNLP-org/electra-base-hateXplain"
    }
  else:
   config = {
        # As of now, BERT and ELECTRA are supported. You can choose any checkpoing of these models.
        ### BERT-base
        #"MODEL": "TehranNLP-org/bert-base-uncased-cls-sst2"
        # "MODEL": "TehranNLP-org/bert-base-uncased-cls-mnli"
        # "MODEL": "TehranNLP-org/bert-base-uncased-cls-hatexplain"
        ### BERT-large
        #"MODEL": "TehranNLP-org/bert-large-sst2"
        # "MODEL": "TehranNLP-org/bert-large-mnli"
        # "MODEL": "TehranNLP-org/bert-large-hateXplain"
        ### ELECTRA
        "MODEL": "TehranNLP-org/electra-base-sst2"
        # "MODEL": "TehranNLP-org/electra-base-mnli"
        # "MODEL": "TehranNLP-org/electra-base-hateXplain"
    }
  SENTENCE = text
  
  tokenizer = AutoTokenizer.from_pretrained(config["MODEL"])
  tokenized_sentence = tokenizer.encode_plus(SENTENCE, return_tensors="pt")
  if "bert" in config["MODEL"]:
      model = BertForSequenceClassification.from_pretrained(config["MODEL"])
  elif "electra" in config["MODEL"]:
      model = ElectraForSequenceClassification.from_pretrained(config["MODEL"])
  else:
      raise Exception(f"Not implented model: {config['MODEL']}")
      
  # Extract single layer attentions
  with torch.no_grad():
      logits, attentions, norms = model(**tokenized_sentence, output_attentions=True, output_norms=True, return_dict=False)
      num_layers = len(attentions)
      norm_nenc = torch.stack([norms[i][4] for i in range(num_layers)]).squeeze().cpu().numpy()
      print("Single layer N-Enc token attribution:", norm_nenc.shape)
  
      # Aggregate and compute GlobEnc
      globenc = AttentionRollout().compute_flows([norm_nenc], output_hidden_states=True)[0]
      globenc = np.array(globenc)
      print("Aggregated N-Enc token attribution (GlobEnc):", globenc.shape)
      


  tokenized_text = tokenizer.convert_ids_to_tokens(tokenized_sentence["input_ids"][0])
  plt.figure(figsize=(14, 8))
  norm_cls = globenc[:, 0, :]
  norm_cls = np.flip(norm_cls, axis=0)
  row_sums = norm_cls.max(axis=1)
  norm_cls = norm_cls / row_sums[:, np.newaxis]
  df = pd.DataFrame(norm_cls, columns=tokenized_text, index=range(len(norm_cls), 0, -1))
  ax = sns.heatmap(df, cmap="Reds", square=True)
  bottom, top = ax.get_ylim()
  ax.set_ylim(bottom + 0.5, top - 0.5)
  plt.title("GlobEnc", fontsize=16)
  plt.ylabel("Layer", fontsize=16)
  plt.xticks(rotation = 90, fontsize=16)
  plt.yticks(fontsize=13)
  plt.gcf().subplots_adjust(bottom=0.2)
  print("logits:", logits)
  
  return plt
  
demo = gr.Blocks()

with demo:
    gr.Markdown(
    """
    ## Please check out [DecompX](https://huggingface.co/spaces/mohsenfayyaz/DecompX) for a more faithful approach.
    ## Gradio Demo for [mohsenfayyaz/GlobEnc](https://github.com/mohsenfayyaz/GlobEnc), GlobEnc: Quantifying Global Token Attribution by Incorporating the Whole Encoder Layer in Transformers
    """)
    inp = [gr.Textbox(),gr.Dropdown(choices=['bert-base-uncased-cls-sst2','bert-large-sst2','electra-base-sst2'])]
    out = gr.Plot()
    
    button = gr.Button(value="Run")
    gr.Examples([["A deep and meaningful film.", "bert-base-uncased-cls-sst2"], ["A deep and meaningful film.", "bert-large-sst2"]], inp, out, inference)
    button.click(fn=inference, 
               inputs=inp, 
               outputs=out)

demo.launch()