app.py

import streamlit as st
import torch
from transformers import pipeline, AutoTokenizer, AutoModelForSequenceClassification
import torchaudio
import os
import jieba

# Device setup: automatically selects CUDA or CPU
device = "cuda" if torch.cuda.is_available() else "cpu"

# Load Whisper model for Cantonese audio transcription
MODEL_NAME = "alvanlii/whisper-small-cantonese"
language = "zh"
pipe = pipeline(task="automatic-speech-recognition", model=MODEL_NAME, chunk_length_s=60, device=device)
pipe.model.config.forced_decoder_ids = pipe.tokenizer.get_decoder_prompt_ids(language=language, task="transcribe")

# Transcription function (supports long audio)
def transcribe_audio(audio_path):
    waveform, sample_rate = torchaudio.load(audio_path)
    duration = waveform.shape[1] / sample_rate
    if duration > 60:
        results = []
        for start in range(0, int(duration), 50):
            end = min(start + 60, int(duration))
            chunk = waveform[:, start * sample_rate:end * sample_rate]
            temp_filename = f"temp_chunk_{start}.wav"
            torchaudio.save(temp_filename, chunk, sample_rate)
            result = pipe(temp_filename)["text"]
            results.append(result)
            os.remove(temp_filename)
        return " ".join(results)
    return pipe(audio_path)["text"]

# Load sentiment analysis model (Custom multilingual sentiment analysis)
sentiment_pipe = pipeline("text-classification", model="CustomModel-multilingual-sentiment-analysis", device=device)

# Text splitting function (using jieba for Chinese text)
def split_text(text, max_length=512):
    words = list(jieba.cut(text))
    chunks, current_chunk = [], ""
    for word in words:
        if len(current_chunk) + len(word) < max_length:
            current_chunk += word
        else:
            chunks.append(current_chunk)
            current_chunk = word
    if current_chunk:
        chunks.append(current_chunk)
    return chunks

# Function to rate sentiment quality based on most frequent result
def rate_quality(text):
    chunks = split_text(text)
    results = []
    for chunk in chunks:
        result = sentiment_pipe(chunk)[0]
        label_map = {"Very Negative": "Very Poor", "Negative": "Poor", "Neutral": "Neutral", "Positive": "Good", "Very Positive": "Very Good"}
        results.append(label_map.get(result["label"], "Unknown"))
    return max(set(results), key=results.count)

# Streamlit main interface
def main():
    st.set_page_config(page_title="Customer Service Quality Analyzer", page_icon="🎙️")

    # Custom CSS styling
    st.markdown("""
    <style>
    @import url('https://fonts.googleapis.com/css2?family=Comic+Neue:wght@700&display=swap');
    .header {
        background: linear-gradient(45deg, #FF9A6C, #FF6B6B);
        border-radius: 15px;
        padding: 2rem;
        text-align: center;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        margin-bottom: 2rem;
    }
    .subtitle {
        font-family: 'Comic Neue', cursive;
        color: #4B4B4B;
        font-size: 1.2rem;
        margin: 1rem 0;
        padding: 1rem;
        background: rgba(255,255,255,0.9);
        border-radius: 10px;
        border-left: 5px solid #FF6B6B;
    }
    </style>
    """, unsafe_allow_html=True)

    # Header
    st.markdown("""
    <div class="header">
        <h1 style='margin:0;'>🎙️ Customer Service Quality Analyzer</h1>
        <p style='color: white; font-size: 1.2rem;'>Evaluate the service quality with simple-uploading!</p>
    </div>
    """, unsafe_allow_html=True)

    # Audio file uploader
    uploaded_file = st.file_uploader("👉🏻 Upload your Cantonese audio file here...", type=["wav", "mp3", "flac"])

    if uploaded_file is not None:
        st.audio(uploaded_file, format="audio/wav")
        temp_audio_path = "uploaded_audio.wav"
        with open(temp_audio_path, "wb") as f:
            f.write(uploaded_file.getbuffer())

        progress_bar = st.progress(0)
        status_container = st.empty()

        # Step 1: Audio transcription
        status_container.info("📝 **Step 1/2**: Transcribing audio...")
        transcript = transcribe_audio(temp_audio_path)
        progress_bar.progress(50)
        st.write("**Transcript:**", transcript)

        # Step 2: Sentiment Analysis
        status_container.info("🧑‍⚖️ **Step 2/2**: Evaluating sentiment quality...")
        quality_rating = rate_quality(transcript)
        progress_bar.progress(100)
        st.write("**Sentiment Rating:**", quality_rating)

        os.remove(temp_audio_path)

if __name__ == "__main__":
    main()