import gradio as gr
import numpy as np
import torch
from datasets import load_dataset
from transformers import pipeline, VitsModel, VitsTokenizer
# from transformers import SpeechT5ForTextToSpeech, SpeechT5HifiGan, SpeechT5Processor, pipeline

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

# load speech translation checkpoint
asr_pipe = pipeline("automatic-speech-recognition", model="openai/whisper-base", device=device)

# load text-to-speech checkpoint and speaker embeddings
# processor = SpeechT5Processor.from_pretrained("microsoft/speecht5_tts")

# model = SpeechT5ForTextToSpeech.from_pretrained("microsoft/speecht5_tts").to(device)
# vocoder = SpeechT5HifiGan.from_pretrained("microsoft/speecht5_hifigan").to(device)

# embeddings_dataset = load_dataset("Matthijs/cmu-arctic-xvectors", split="validation")
# speaker_embeddings = torch.tensor(embeddings_dataset[7306]["xvector"]).unsqueeze(0)
# using VITS MMS TTS instead of T5 TTS

model = VitsModel.from_pretrained("facebook/mms-tts-deu")

tokenizer = VitsTokenizer.from_pretrained("facebook/mms-tts-deu")

def translate(audio):
    try:
        outputs = asr_pipe(audio, generate_kwargs={"task": "translate", "return_timestamps": True})
        return outputs["text"]
    except Exception as e:
        print(f"Error in translation: {e}")
        return "Error during translation"


def synthesise(text):
    try:
        inputs = tokenizer(text, return_tensors="pt")
        input_ids = inputs["input_ids"]
        with torch.no_grad():
            outputs = model(input_ids)
        speech = outputs["waveform"]
        speech = speech.cpu()
        return speech.squeeze()
    except Exception as e:
        print(f"Error in synthesis: {e}")
        return None



def speech_to_speech_translation(audio):
    translated_text = translate(audio)
    print('translated text:\t', translated_text)
    if translated_text == "Error during translation":
        return None, None # Return None for both outputs in case of translation error.

    synthesised_speech = synthesise(translated_text)

    if synthesised_speech is None:
        return None, None # Return None for both outputs in case of synthesis error.

    synthesised_speech = (synthesised_speech.numpy() * 32767).astype(np.int16)
    return 16000, synthesised_speech


title = "Cascaded STST"
description = """
Demo for cascaded speech-to-speech translation (STST), mapping from source speech in any language to target speech in German. Demo uses OpenAI's [Whisper Base](https://huggingface.co/openai/whisper-base) model for speech translation, and Microsoft's
[SpeechT5 TTS](https://huggingface.co/microsoft/speecht5_tts) model for text-to-speech:

![Cascaded STST](https://huggingface.co/datasets/huggingface-course/audio-course-images/resolve/main/s2st_cascaded.png "Diagram of cascaded speech to speech translation")
"""

demo = gr.Blocks()

mic_translate = gr.Interface(
    fn=speech_to_speech_translation,
    inputs=gr.Microphone(type="filepath"),
    outputs=gr.Audio(label="Generated Speech", type="numpy"),
    title=title,
    description=description,
)

file_translate = gr.Interface(
    fn=speech_to_speech_translation,
    inputs=gr.Audio(type="filepath"),
    outputs=gr.Audio(label="Generated Speech", type="numpy"),
    examples=[["./example.wav"]],
    title=title,
    description=description,
)

with demo:
    gr.TabbedInterface([mic_translate, file_translate], ["Microphone", "Audio File"])

demo.launch(debug=True, height=600)
# demo.launch(height=600)