import pyaudio
import threading

from .config import AUDIO_INPUT_DEVICE_INDEX, AUDIO_INPUT_DEVICE_NAME


class AudioManager:
    _instance = None
    _lock = threading.Lock()

    def __new__(cls):
        with cls._lock:
            if cls._instance is None:
                cls._instance = super(AudioManager, cls).__new__(cls)
                cls._instance.pa = pyaudio.PyAudio()
                print("🔊 AudioManager: PyAudio initialized (Global)")
            return cls._instance

    def get_pyaudio(self):
        return self.pa

    def resolve_input_device(self):
        """
        Возвращает индекс и информацию о входном устройстве.
        Если индекс/имя не заданы в .env, используем системное default устройство.
        """
        if AUDIO_INPUT_DEVICE_INDEX is not None:
            info = self.pa.get_device_info_by_index(AUDIO_INPUT_DEVICE_INDEX)
            if info.get("maxInputChannels", 0) <= 0:
                raise ValueError(
                    f"AUDIO_INPUT_DEVICE_INDEX={AUDIO_INPUT_DEVICE_INDEX} не является входным устройством."
                )
            return AUDIO_INPUT_DEVICE_INDEX, info

        if AUDIO_INPUT_DEVICE_NAME:
            wanted = AUDIO_INPUT_DEVICE_NAME.lower()
            for index in range(self.pa.get_device_count()):
                info = self.pa.get_device_info_by_index(index)
                if info.get("maxInputChannels", 0) <= 0:
                    continue
                name = str(info.get("name", ""))
                if wanted in name.lower():
                    return index, info
            raise ValueError(
                f"Не найдено входное устройство по AUDIO_INPUT_DEVICE_NAME={AUDIO_INPUT_DEVICE_NAME!r}."
            )

        default_info = self.pa.get_default_input_device_info()
        return None, default_info

    def cleanup(self):
        if self.pa:
            self.pa.terminate()
            self.pa = None


def get_audio_manager():
    return AudioManager()