fix

utils/tts.py

@@ -35,6 +35,23 @@ def get_best_engine(lang_code: str = 'z') -> TTSEngineBase:
     """
     return TTSFactory.create_engine(None, lang_code)
 
+# Function to get a TTS engine instance (for backward compatibility)
+def get_tts_engine(engine_type: str = None, lang_code: str = 'z') -> TTSEngineBase:
+    """Get a TTS engine instance
+    
+    This function is maintained for backward compatibility with app.py.
+    New code should use the factory pattern implementation directly.
+    
+    Args:
+        engine_type (str, optional): Type of engine to create ('kokoro', 'kokoro_space', 'dia', 'dummy')
+                                    If None, the best available engine will be used
+        lang_code (str): Language code for the engine
+        
+    Returns:
+        TTSEngineBase: An instance of a TTS engine
+    """
+    return TTSFactory.create_engine(engine_type, lang_code)
+
 # Legacy function for backward compatibility
 def generate_speech(text: str, language: str = "z", voice: str = "af_heart", speed: float = 1.0) -> str:
     """Generate speech using the best available TTS engine