import streamlit as st
from transformers import WhisperForConditionalGeneration, WhisperProcessor
from transformers import pipeline
import librosa
import torch
from spleeter.separator import Separator
from pydub import AudioSegment
from IPython.display import Audio
import os
import accelerate

os.environ["PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION"] = "python" #fix Spaces pipeline error

# load song
output_file = "/content/"

# preprocess and crop audio file
def audio_preprocess():
    # separate music and vocal
    separator = Separator('spleeter:2stems')
    separator.separate_to_file(input_file, output_file)

    # Crop the audio
    start_time = 60000  # e.g. 30 seconds, 30000
    end_time = 110000  # e.g. 40 seconds, 40000

    audio = AudioSegment.from_file('/content/test1/vocals.wav')
    cropped_audio = audio[start_time:end_time]
    cropped_audio.export('/content/cropped_vocals.wav', format='wav') # save vocal audio file


# ASR transcription
def asr_model():
    # load audio file
    y, sr = librosa.load('cropped_vocals.wav', sr=16000)

    # ASR model
    MODEL_NAME = "RexChan/ISOM5240-whisper-small-zhhk_1"
    processor = WhisperProcessor.from_pretrained(MODEL_NAME)
    model = WhisperForConditionalGeneration.from_pretrained(MODEL_NAME, low_cpu_mem_usage=True)

    model.config.forced_decoder_ids = None
    model.config.suppress_tokens = []
    model.config.use_cache = False

    processed_in = processor(y, sampling_rate=sr, return_tensors="pt")
    gout = model.generate(
        input_features=processed_in.input_features,
        output_scores=True, return_dict_in_generate=True
    )
    transcription = processor.batch_decode(gout.sequences, skip_special_tokens=True)[0]

    # print result
    print(f"Song lyrics = {transcription}")

    return transcription


# sentiment analysis
def senti_model(transcription):

    pipe = pipeline("text-classification", model="lxyuan/distilbert-base-multilingual-cased-sentiments-student")
    final_result = pipe(transcription)
    print(f"Sentiment Analysis shows that this song is {final_result[0]['label']}. Confident level of this analysis is {final_result[0]['score']*100:.1f}%.")

    return final_result


# main
def main():

    input_file = st.file_uploader("upload a song in mp3 format", type="mp3") # upload song
    if input_file is not None:
      st.write("File uploaded successfully!")
    else:
      st.write("No file uploaded.")
    st.set_page_config(page_title="Sentiment Analysis on Your Cantonese Song",)
    st.header("Cantonese Song Sentiment Analyzer")
    audio_preprocess()
    transcription = asr_model()
    final_result = senti_model(transcription)
    
    if st.button("Play Audio"):
        st.audio(audio_data['audio'],
                    format="audio/wav",
                    start_time=0,
                    sample_rate = audio_data['sampling_rate'])


if __name__ == '__main__':
    main()