"""Speech synthesis service interface."""

from abc import ABC, abstractmethod
from typing import Iterator, TYPE_CHECKING

if TYPE_CHECKING:
    from ..models.speech_synthesis_request import SpeechSynthesisRequest
    from ..models.audio_content import AudioContent
    from ..models.audio_chunk import AudioChunk


class ISpeechSynthesisService(ABC):
    """Interface for speech synthesis services."""
    
    @abstractmethod
    def synthesize(self, request: 'SpeechSynthesisRequest') -> 'AudioContent':
        """
        Synthesize speech from text.
        
        Args:
            request: The speech synthesis request containing text and voice settings
            
        Returns:
            AudioContent: The synthesized audio
            
        Raises:
            SpeechSynthesisException: If synthesis fails
        """
        pass
    
    @abstractmethod
    def synthesize_stream(self, request: 'SpeechSynthesisRequest') -> Iterator['AudioChunk']:
        """
        Synthesize speech from text as a stream.
        
        Args:
            request: The speech synthesis request containing text and voice settings
            
        Returns:
            Iterator[AudioChunk]: Stream of audio chunks
            
        Raises:
            SpeechSynthesisException: If synthesis fails
        """
        pass