app.py

import os
import tempfile
import gradio as gr
from huggingface_hub import hf_hub_download
from TTS.utils.synthesizer import Synthesizer

# Configuration
MAX_TXT_LEN = 400
HF_REPO = "sulaimank/luganda_LMs"

# Model mappings
MODEL_INFO = {
    "Model 1": "checkpoint_2080000.pth",
    "Model 2": "checkpoint_2085000.pth", 
    "Model 3": "checkpoint_2090000.pth",
    "Model 4": "checkpoint_2095000.pth",
    "Model 5": "checkpoint_2100000.pth",
}

# Cache for loaded synthesizers
synthesizer_cache = {}
config_path = None

def get_config():
    """Download config file once"""
    global config_path
    if config_path is None:
        config_path = hf_hub_download(HF_REPO, filename="config.json")
    return config_path

def load_synth(model_choice: str):
    """Load synthesizer with caching"""
    if model_choice not in synthesizer_cache:
        model_file = MODEL_INFO[model_choice]
        model_path = hf_hub_download(HF_REPO, filename=model_file)
        synthesizer_cache[model_choice] = Synthesizer(
            tts_checkpoint=model_path,
            tts_config_path=get_config()
        )
    return synthesizer_cache[model_choice]

def generate_speech(text: str, model_choice: str):
    """Generate speech from text"""
    if not text.strip():
        return None
        
    # Truncate if too long
    if len(text) > MAX_TXT_LEN:
        text = text[:MAX_TXT_LEN]
    
    try:
        synthesizer = load_synth(model_choice)
        wav = synthesizer.tts(text)
        
        # Save to temporary file
        with tempfile.NamedTemporaryFile(suffix=".wav", delete=False) as fp:
            synthesizer.save_wav(wav, fp.name)
            return fp.name
    except Exception as e:
        print(f"Error generating speech: {e}")
        return None

# Example texts
examples = [
    ["Nalubaale y'ennyanja esinga obunene mu Uganda.", "Model 1"],
    ["Abantu bangi tebamanyi kuwandika bulungi Luganda.", "Model 3"], 
    ["Kampala kye kibuga kya Uganda ekikulu.", "Model 5"],
]

# Custom CSS for modern look
custom_css = """
#title {
    text-align: center;
    background: linear-gradient(45deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

#subtitle {
    text-align: center;
    color: #64748b;
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.main-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem 1rem;
    width: 95%;
}

.input-section {
    background: white;
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    width: 100%;
}

.generate-btn {
    background: linear-gradient(45deg, #667eea, #764ba2) !important;
    border: none !important;
    border-radius: 12px !important;
    padding: 0.75rem 2rem !important;
    font-weight: 600 !important;
    font-size: 1.1rem !important;
    transition: all 0.3s ease !important;
}

.generate-btn:hover {
    transform: translateY(-2px) !important;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3) !important;
}

#root {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}
"""

# Create the Gradio interface
with gr.Blocks(
    css=custom_css,
    theme=gr.themes.Soft(
        primary_hue="blue",
        secondary_hue="purple",
        neutral_hue="slate"
    ),
    title="Luganda TTS"
) as demo:
    
    # Header
    gr.HTML("""
        <div id="title">🗣️ Luganda TTS 🗣️</div>
        <div id="subtitle">Transform text into Luganda speech</div>
    """)
    
    # Main container
    with gr.Column(elem_classes=["main-container"]):
        with gr.Column(elem_classes=["input-section"]):
            
            # Input text
            text_input = gr.Textbox(
                label="Enter Luganda Text",
                placeholder="Wandika wano ekigambo mu Luganda...",
                value="Gyebaleko ssebo.",
                lines=5,
                max_lines=8
            )
            
            # Model selection and generate button in a row
            with gr.Row():
                model_choice = gr.Radio(
                    label="Select Model",
                    choices=list(MODEL_INFO.keys()),
                    value="Model 1",
                    interactive=True
                )
                
                with gr.Column():
                    generate_btn = gr.Button(
                        "Generate Speech",
                        variant="primary",
                        elem_classes=["generate-btn"],
                        size="lg"
                    )
            
            # Audio output
            audio_output = gr.Audio(
                label="Generated Speech",
                type="filepath",
                interactive=False
            )
            
            # Examples
            gr.Examples(
                examples=examples,
                inputs=[text_input, model_choice],
                outputs=audio_output,
                fn=generate_speech,
                cache_examples=False,
                label="Try these examples"
            )
    
    # Event handlers
    generate_btn.click(
        fn=generate_speech,
        inputs=[text_input, model_choice],
        outputs=audio_output,
        show_progress=True
    )
    
    text_input.submit(
        fn=generate_speech,
        inputs=[text_input, model_choice], 
        outputs=audio_output,
        show_progress=True
    )

if __name__ == "__main__":
    demo.launch(
        share=False,
        server_name="0.0.0.0",
        server_port=7860,
        show_error=True
    )