import torch
from utils import Callable_tokenizer, preprocess_en
from models import Seq2seq_with_attention, Encoder, Decoder, Attention
import gradio as gr

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

seq2seq_with_attention = torch.load("./seq2seq_with_attention_df-CoVoST2_df-opus_seed-123_subword.bin", map_location=device, weights_only=False)

en_sp = Callable_tokenizer('./tokenizers/NEW_en_vocab_df-CoVoST2_df-opus_seed-123_vocab-16K_FULL.model')
ar_sp = Callable_tokenizer('./tokenizers/NEW_ar_vocab_df-CoVoST2_df-opus_seed-123_vocab-32K_FULL.model')

def pre_processor(text):
    preprocessed = preprocess_en(text)
    en_tokens = torch.tensor(en_sp.user_tokenization(preprocessed)).unsqueeze(0).to(device)
    return en_tokens

def post_processor(raw_output):
    return ar_sp.decode(raw_output[1:-1])

@torch.no_grad
def lunch(raw_input, maxtries=30):
    en_tokens = pre_processor(raw_input)
    output = seq2seq_with_attention.translate(en_tokens, maxtries)
    return post_processor(output)


custom_css ='.gr-button {background-color: #bf4b04; color: white;}'
with gr.Blocks(css=custom_css) as demo:
    with gr.Row():
        with gr.Column():
            input_text = gr.Textbox(label='English Sentence')
            gr.Examples(['How are you?',
                         'She is a good girl.',
                         'Who is better than me?!'],
                        inputs=input_text, label="Examples: ")
        with gr.Column():
            output = gr.Textbox(label="Arabic Translation")
            
            start_btn = gr.Button(value='Submit', elem_classes=["gr-button"])
    start_btn.click(fn=lunch, inputs=input_text, outputs=output)

demo.launch()