import gradio as gr
import numpy as np
from datasets import load_dataset
from transformers import AutoTokenizer
import matplotlib.pyplot as plt
import seaborn as sns
from enum import Enum


class VisType(Enum):
    SUM = 'Sum over Layers'
    

num_layers = 24
dataset = load_dataset('dar-tau/grammar-attention-maps-opt-350m')['train']
tokenizer = AutoTokenizer.from_pretrained('facebook/opt-350m', add_prefix_space=True)


def analyze_sentence(index, vis_type):
    row = dataset[index]
    text = row['text']
    tokenized = tokenizer.batch_decode(tokenizer.encode(text, add_special_tokens=False))
    attn_map_shape = row['attention_maps_shape'][1:]
    seq_len = attn_map_shape[1]
    attn_maps = np.array(row['attention_maps']).reshape(*attn_map_shape).clip(0, 1)
    fig = plt.figure(figsize=(0.1 + 0.3 * len(tokenized), 0.25 * len(tokenized)))
    attn_maps = attn_maps[:, 1:, 1:]
    if vis_type == VisType.SUM.value:
        plot_data = attn_maps.sum(0)
    elif vis_type.startswith('Layer #'):
        layer_to_inspect = int(vis_type.split('#')[1])
        plot_data = attn_maps[layer_to_inspect]
    else:
        print(vis_type)
        0/0
    sns.heatmap(plot_data)
    plt.xticks(np.arange(seq_len - 1) + 0.5, tokenized[1:], rotation=90);
    plt.yticks(np.arange(seq_len - 1) + 0.5, tokenized[1:], rotation=0);
    plt.ylabel('TARGET')
    plt.xlabel('SOURCE')    
    plt.grid()
    metrics = {'Metrics': 1}
    metrics.update({k: v for k, v in row.items() if k not in ['text', 'attention_maps', 'attention_maps_shape']})    
    return fig, metrics

demo = gr.Blocks()
with demo:
    with gr.Row():
        sentence_dropdown = gr.Dropdown(label="Sentence", 
                                        choices=[x.split('</s> ')[1] for x in dataset['text']], 
                               value=0, min_width=300, type='index')
        vis_dropdown = gr.Dropdown(label="Visualization", choices=[x.value for x in VisType] + [f'Layer #{i}' for i in range(num_layers)], 
                                   min_width=70, value=VisType.SUM, type='value')
        btn = gr.Button("Run", min_width=30)
    output = gr.Plot(label="Plot", container=True)
    metrics = gr.Label("Metrics")
    btn.click(analyze_sentence, [sentence_dropdown, vis_dropdown], [output, metrics])


if __name__ == "__main__":
    demo.launch()