from transformers import pipeline, set_seed
from transformers import BioGptTokenizer, BioGptForCausalLM
from multilingual_translation import translate
from utils import lang_ids
import gradio as gr
import torch

biogpt_model_list = [
    "microsoft/biogpt",
    "microsoft/BioGPT-Large",
    "microsoft/BioGPT-Large-PubMedQA"
]

lang_model_list = [
    "facebook/m2m100_1.2B",
    "facebook/m2m100_418M"
]

lang_list = list(lang_ids.keys())

def translate_to_english(text, lang_model_id, base_lang):
    if base_lang == "English":
        return text
    else:
        base_lang = lang_ids[base_lang]
        new_text = translate(lang_model_id, text, base_lang, "en")
        return new_text[0]

def biogpt(
    prompt: str,
    biogpt_model_id: str,
    max_length: str,
    num_return_sequences: int,
    base_lang: str,
    lang_model_id: str
):
    
    en_prompt = translate_to_english(prompt, lang_model_id, base_lang)
    generator = pipeline("text-generation", model=biogpt_model_id, device="cpu")
    output = generator(en_prompt, max_length=max_length, num_return_sequences=num_return_sequences, do_sample=True)
    output_dict = {}
    for i in range(num_return_sequences):
        output_dict[str(i+1)] = output[i]['generated_text']

    output_text = ""
    for i in range(num_return_sequences):
        output_text += f'{output_dict[str(i+1)]}\n\n'
    
    if base_lang == "English":
        base_lang_output = output_text
        
    else: 
        base_lang_output_ = ""
        for i in range(num_return_sequences):
            base_lang_output_ += f'{translate(lang_model_id, output_dict[str(i+1)], "en", lang_ids[base_lang])[0]}\n\n'
        base_lang_output = base_lang_output_
    
    
    return en_prompt, output_text, base_lang_output


inputs = [
    gr.Textbox(lines=5, value="COVID-19 is", label="Prompt"),
    gr.Dropdown(biogpt_model_list, value="microsoft/biogpt", label="BioGPT Model ID"),
    gr.Slider(minumum=1, maximum=100, value=25, step=1, label="Max Length"),
    gr.Slider(minumum=1, maximum=10, value=2, step=1, label="Number of Outputs"),
    gr.Dropdown(lang_list, value="English", label="Base Language"),
    gr.Dropdown(lang_model_list, value="facebook/m2m100_418M", label="Language Model ID")
    ]

outputs = [
    gr.outputs.Textbox(label="Prompt"),
    gr.outputs.Textbox(label="Output"),
    gr.outputs.Textbox(label="Translated Output")
]

examples = [
    ["COVID-19 is", "microsoft/biogpt", 25, 2, "English", "facebook/m2m100_418M"],
    ["Kanser", "microsoft/biogpt", 25, 2, "Turkish", "facebook/m2m100_1.2B"]
]

title = "M2M100 + BioGPT: Generative Pre-trained Transformer for Biomedical Text Generation and Mining"

description = "BioGPT is a domain-specific generative pre-trained Transformer language model for biomedical text generation and mining. BioGPT follows the Transformer language model backbone, and is pre-trained on 15M PubMed abstracts from scratch. Github: github.com/microsoft/BioGPT Paper: https://arxiv.org/abs/2210.10341" 

demo_app = gr.Interface(
    biogpt, 
    inputs, 
    outputs, 
    title=title, 
    description=description,
    examples=examples, 
    cache_examples=False,
)
demo_app.launch(debug=True, enable_queue=True)