import asyncio
import platform
import subprocess
import tempfile

from config import AppConfig


class TTSService:
    def __init__(self, config: AppConfig):
        self._voice = config.tts_voice
        self._edge_voice = config.tts_edge_voice

    async def speak(self, text: str) -> str | None:
        """크로스플랫폼 TTS. macOS: say→edge-tts→pyttsx3 / Windows: edge-tts→pyttsx3"""
        if not text:
            return None

        if platform.system() == "Darwin":
            try:
                tmp = tempfile.NamedTemporaryFile(suffix=".aiff", delete=False)
                tmp.close()
                await asyncio.to_thread(
                    subprocess.run,
                    ["say", "-v", self._voice, "-o", tmp.name, text],
                    check=True,
                    capture_output=True,
                )
                return tmp.name
            except Exception:
                pass

        try:
            import edge_tts
            tmp = tempfile.NamedTemporaryFile(suffix=".mp3", delete=False)
            tmp.close()
            await edge_tts.Communicate(text, self._edge_voice).save(tmp.name)
            return tmp.name
        except Exception:
            pass

        try:
            import pyttsx3
            tmp = tempfile.NamedTemporaryFile(suffix=".wav", delete=False)
            tmp.close()
            def _save():
                engine = pyttsx3.init()
                engine.save_to_file(text, tmp.name)
                engine.runAndWait()
            await asyncio.to_thread(_save)
            return tmp.name
        except Exception:
            return None