app.py

import gradio as gr
from supertonic import TTS
import os
import numpy as np

# Initialize TTS - auto_download=True handles the HF model fetching automatically
# This runs on CPU by default via ONNX
try:
    tts = TTS(auto_download=True)
except Exception as e:
    print(f"Error initializing TTS: {e}")

# All available voices found in the repository tree
VOICES = ["M1", "M2", "M3", "M4", "M5", "F1", "F2", "F3", "F4", "F5"]

# The 31 supported languages
LANGUAGES = {
    "English": "en", "Korean": "ko", "Japanese": "ja", "Arabic": "ar",
    "Bulgarian": "bg", "Czech": "cs", "Danish": "da", "German": "de",
    "Greek": "el", "Spanish": "es", "Estonian": "et", "Finnish": "fi",
    "French": "fr", "Hindi": "hi", "Croatian": "hr", "Hungarian": "hu",
    "Indonesian": "id", "Italian": "it", "Lithuanian": "lt", "Latvian": "lv",
    "Dutch": "nl", "Polish": "pl", "Portuguese": "pt", "Romanian": "ro",
    "Russian": "ru", "Slovak": "sk", "Slovenian": "sl", "Swedish": "sv",
    "Turkish": "tr", "Ukrainian": "uk", "Vietnamese": "vi"
}

def generate_speech(text, voice, language_name):
    if not text.strip():
        raise gr.Error("Please enter some text.")
        
    try:
        lang_code = LANGUAGES[language_name]
        
        # Get the voice style object
        style = tts.get_voice_style(voice_name=voice)
        
        # Synthesize (Returns wav data and a numpy array for duration)
        wav, duration = tts.synthesize(text, voice_style=style, lang=lang_code)
        
        # Save to a temporary path
        output_path = "output.wav"
        tts.save_audio(wav, output_path)
        
        # FIX: Convert numpy.ndarray duration to float for f-string compatibility
        readable_duration = float(duration)
        
        return output_path, f"Generation Successful! \nDuration: {readable_duration:.2f}s"
    
    except Exception as e:
        raise gr.Error(f"Generation failed: {str(e)}")

# Define the Gradio Interface
with gr.Blocks(theme='soft', title="Supertonic 3 TTS") as demo:
    gr.Markdown("# 🎙️ Supertonic 3: Multilingual TTS")
    gr.Markdown("An on-device, lightweight Text-to-Speech system by **Supertone**. Running on CPU via ONNX.")
    
    with gr.Row():
        with gr.Column(scale=1):
            input_text = gr.Textbox(
                label="Input Text", 
                placeholder="Type your message here...",
                value="The train delay was announced at 4:45 PM <breath> due to track maintenance.",
                lines=4
            )
            
            with gr.Row():
                voice_opt = gr.Dropdown(
                    choices=VOICES, 
                    value="M1", 
                    label="Voice Style"
                )
                lang_opt = gr.Dropdown(
                    choices=sorted(list(LANGUAGES.keys())), 
                    value="English", 
                    label="Language"
                )
            
            btn = gr.Button("Synthesize Speech", variant="primary")
            
        with gr.Column(scale=1):
            audio_output = gr.Audio(label="Synthesized Audio", type="filepath")
            status_box = gr.Textbox(label="Status", interactive=False)
            
            gr.HTML("""
                <div style="margin-top: 20px; text-align: center;">
                    <p>Supported Expression Tags: <code>&lt;laugh&gt;</code>, <code>&lt;breath&gt;</code>, <code>&lt;sigh&gt;</code></p>
                    <a href="https://huggingface.co/Supertone/supertonic-3">
                        <img src="https://img.shields.io/badge/Model-Supertone%20Supertonic--3-blue?logo=huggingface" alt="Model Page">
                    </a>
                </div>
            """)

    # Setup Examples
    gr.Examples(
        examples=[
            ["Hello! This is a test of the Supertonic 3 system running locally.", "M1", "English"],
            ["こんにちは、これは日本語の音声合成のテストです。", "F1", "Japanese"],
            ["¡Hola! Esta es una prueba de voz en español.", "F3", "Spanish"],
            ["C'est un plaisir de vous rencontrer.", "M4", "French"]
        ],
        inputs=[input_text, voice_opt, lang_opt]
    )

    btn.click(
        fn=generate_speech, 
        inputs=[input_text, voice_opt, lang_opt], 
        outputs=[audio_output, status_box]
    )

if __name__ == "__main__":
    demo.launch()