app.py

import gradio as gr
from gtts import gTTS
import tempfile
import os

# Define a simple dictionary of available languages for gTTS
# We can't use the massive list from tts_voice.py because gTTS uses simple language codes.
gtts_languages = {
    "English": "en",
    "Mandarin Chinese": "zh-cn",
    "French": "fr",
    "German": "de",
    "Spanish": "es",
    "Japanese": "ja",
    "Korean": "ko",
    "Russian": "ru"
}

# The main function is now SYNCHRONOUS (no 'async')
def text_to_speech_gtts(text, language_name, slow_speed): # ADDED slow_speed
    # 1. Input Validation
    if not text or not text.strip():
        return "ERROR: Input text cannot be empty.", None

    try:
        # Get the language code from the name 
        lang_code = gtts_languages[language_name]
        
        # Create a temporary file path
        with tempfile.NamedTemporaryFile(delete=False, suffix=".mp3") as tmp_file:
            tmp_path = tmp_file.name

        # Initialize gTTS object - USE slow_speed from input
        tts = gTTS(text=text, lang=lang_code, slow=slow_speed) 
        
        # Save the audio file (synchronous operation) [cite: 4]
        tts.save(tmp_path) 

        return "Speech synthesis complete: {}".format(text), tmp_path
    
    except Exception as e:
        # Handle all gTTS-related errors (e.g., language not supported, network failure)
        return (f"ERROR: Failed to generate audio. Details: {str(e)}", None)


# --- Modern Gradio Component Syntax (Translated UI) ---
input_text = gr.Textbox(lines=5, label="Input Text")
speech_speed = gr.Radio(
    choices=[("Normal", False), ("Slow", True)], # Custom labels and corresponding boolean values
    value=False, # Default to Normal speed
    label="Speech Speed"
)
output_text = gr.Textbox(label="Output Text") 
output_audio = gr.Audio(
    type="filepath", 
    label="Generated Audio File", 
    interactive=True # The file will still be available for download without 'live=False'
)

default_language = "English" # Use English as the default language
language = gr.Dropdown(
    choices=list(gtts_languages.keys()), 
    value=default_language, 
    label="Language" # Dropped 'Voice' because gTTS has no specific voice selection
) 


# --- Gradio Interface Definition ---
interface = gr.Interface(
    fn=text_to_speech_gtts, # Use the new synchronous function
    inputs=[input_text, language, speech_speed], # ADDED speech_speed
    outputs=[output_text, output_audio],
    title="Google TTS Text-to-Speech (Simple Version)", 
    description="Convert text into audio using the reliable Google Text-to-Speech service. (Max 100 characters for optimal stability)"
)


# --- Standard Synchronous Launch Command ---
if __name__ == "__main__":
    # Gradio runs synchronous functions reliably without extra configuration.
    interface.launch()