from typing import Any, Dict, List, Optional
import sounddevice as sd
from helpers.os_environment import isLinux, isMacOS, isWindows
import glob
class DeviceManager():

    @classmethod
    def _isOutput(cls, device:Dict[str,Any]) -> bool:
        return device["max_output_channels"] > 0

    @classmethod
    def _getAudioDevices(cls) -> sd.DeviceList:
        # To update the list of devices
        # Sadly this doesn't work on MacOS.
        if not isMacOS():
            sd._terminate()
            sd._initialize()
        devices: sd.DeviceList = sd.query_devices()
        return devices

    @classmethod
    def getAudioOutputs(cls) -> List[Dict]:
        outputs: List[Dict] = list(filter(cls._isOutput, cls._getAudioDevices()))
        outputs = sorted(outputs, key=lambda k: k['name'])
        return [{"name": None}] + outputs

    @classmethod
    def getSerialPorts(cls) -> List[Optional[str]]:
        """ Lists serial port names

            :raises EnvironmentError:
                On unsupported or unknown platforms
            :returns:
                A list of the serial ports available on the system
        """
        # TODO: Get list of COM ports properly. (Can't use )
        if isWindows():
            ports = ['COM%s' % (i + 1) for i in range(8)]
        elif isLinux():
            # this excludes your current terminal "/dev/tty"
            ports = glob.glob('/dev/tty[A-Za-z]*')
        elif isMacOS():
            ports = glob.glob('/dev/tty.*')
        else:
            raise EnvironmentError('Unsupported platform')

        valid: List[str] = ports

        result: List[Optional[str]] = []

        if len(valid) > 0:
            valid.sort()

        result.append(None) # Add the None option
        result.extend(valid)

        return result