import gradio as gr
import transformers

encoder_model_name = "cl-tohoku/bert-base-japanese-v2"
decoder_model_name = "openai-community/gpt2"
src_tokenizer = transformers.BertJapaneseTokenizer.from_pretrained(encoder_model_name)
trg_tokenizer = transformers.PreTrainedTokenizerFast.from_pretrained(decoder_model_name)
model = transformers.EncoderDecoderModel.from_pretrained("sappho192/jesc-ja-en-translator")


def translate(text_src):
    embeddings = src_tokenizer(text_src, return_attention_mask=False, return_token_type_ids=False, return_tensors='pt')
    embeddings = {k: v for k, v in embeddings.items()}
    output = model.generate(**embeddings, max_length=512)[0, 1:-1]
    text_trg = trg_tokenizer.decode(output.cpu())
    return text_trg


def endpoint(sentence):
    return translate(sentence)


# demo = gr.Interface(fn=endpoint, inputs="text", outputs="text")
with gr.Blocks() as demo:
    input = gr.Textbox(label="Sentence")
    output = gr.Textbox(label="Result")
    btn = gr.Button(value="Submit")
    btn.click(endpoint, inputs=[input], outputs=[output])
    
    gr.Markdown("## Examples")
    gr.Markdown(
    """
    Translated result can be wrong or containg misleading content.  
    번역된 결과는 정확하지 않을 수 있으며, 적절치 않은 표현을 포함할 수 있습니다.
    """)
    gr.Examples(
        [["初めまして."],
         ["夜になりました"],
         ["試験前に緊張したあまり、熱がでてしまった。"], 
         ["山田は英語にかけてはクラスの誰にも負けない。"],
         ["この本によれば、最初の人工橋梁は新石器時代にさかのぼるという。"]],
        [input],
        output,
        endpoint,
        cache_examples=False
    )
    
if __name__ == "__main__":
    demo.launch(share=True)