import torch

import gradio as gr
import yt_dlp as youtube_dl
from transformers import pipeline
from transformers.pipelines.audio_utils import ffmpeg_read
from transformers import MBartForConditionalGeneration, MBart50TokenizerFast


import tempfile
import os

MODEL_NAME = "openai/whisper-medium"
BATCH_SIZE = 8
FILE_LIMIT_MB = 1000

device = 0 if torch.cuda.is_available() else "cpu"

pipe = pipeline(
    task="automatic-speech-recognition",
    model=MODEL_NAME,
    chunk_length_s=30,
    device=device,
)

model = MBartForConditionalGeneration.from_pretrained("sanjitaa/mbart-many-to-many")
tokenizer = MBart50TokenizerFast.from_pretrained("sanjitaa/mbart-many-to-many")

def translate(inputs, task):
    if inputs is None:
        raise gr.Error("No audio file submitted! Please upload or record an audio file before submitting your request.")

    text = pipe(inputs, batch_size=BATCH_SIZE, generate_kwargs={"task": task}, return_timestamps=True)["text"]

    encoded_text = tokenizer(text, return_tensors="pt")
    tokenizer.src_lang = "en_XX"
    
    generated_tokens = model.generate(
        **encoded_text,
        forced_bos_token_id=tokenizer.lang_code_to_id["fr_XX"]
    )
    result = tokenizer.batch_decode(generated_tokens, skip_special_tokens=True)
    return result
        

demo = gr.Blocks()

mf_transcribe = gr.Interface(
    fn=translate,
    inputs=[
        gr.inputs.Audio(source="microphone", type="filepath", optional=True),
        gr.inputs.Radio(["translate"], label="Task", default="translate"),
        
    ],
    outputs="text",
    layout="horizontal",
    theme="huggingface",
    title="Whisper Medium: Transcribe Audio",
    description=(
        "Transcribe long-form microphone or audio inputs with the click of a button! Demo uses the"
        f" checkpoint [{MODEL_NAME}](https://huggingface.co/{MODEL_NAME}) and 🤗 Transformers to transcribe audio files"
        " of arbitrary length."
    ),
    allow_flagging="never",
)

file_transcribe = gr.Interface(
    fn=transcribe,
    inputs=[
        gr.inputs.Audio(source="upload", type="filepath", optional=True, label="Audio file"),
        gr.inputs.Radio(["translate"], label="Task", default="transcribe"),
    ],
    outputs="text",
    layout="horizontal",
    theme="huggingface",
    title="Whisper Large V2: Transcribe Audio",
    description=(
        "Transcribe long-form microphone or audio inputs with the click of a button! Demo uses the"
        f" checkpoint [{MODEL_NAME}](https://huggingface.co/{MODEL_NAME}) and 🤗 Transformers to transcribe audio files"
        " of arbitrary length."
    ),
    allow_flagging="never",
)


with demo:
    gr.TabbedInterface([mf_transcribe, file_transcribe], ["Microphone", "Audio file"])

demo.launch(enable_queue=True)