from importlib.metadata import PackageNotFoundError
from os import path, environ
from cpdctrl.utility.config_file import ConfigFile



class AppConfig:
    """
    Configuration File
    """
    APP_NAME: str = "cpdctrl-gui"
    APP_VERSION: str = "unknown"
    CONFIG_DIR: str = path.expanduser("~/.config/cpdctrl")
    MAIN_CFG: ConfigFile = None
    MEAS_CFG: ConfigFile = None
    @classmethod
    def initialize(cls) -> None:
        """
        Perform any necessary initializations here, e.g.:
        - Loading settings from a file
        """
        if 'XDG_CONFIG_HOME' in environ.keys():
            AppConfig.CONFIG_DIR = path.join(environ["XDG_CONFIG_HOME"], "cpdctrl")
        # Main CFG
        AppConfig.MAIN_CFG_PATH = path.join(AppConfig.CONFIG_DIR, "cpdctrl-gui.yaml")
        AppConfig.MAIN_CFG = ConfigFile(AppConfig.MAIN_CFG_PATH, {
            "voltage_measurement_device_auto_reconnect": True,
            "led_device_auto_reconnect": True,
            "datadir": "~/data2",
        })

        # Measurement CFG
        AppConfig.MEAS_CFG_PATH = path.join(AppConfig.CONFIG_DIR, "cpdctrl-gui-measurement.yaml")
        AppConfig.MEAS_CFG = ConfigFile(AppConfig.MEAS_CFG_PATH, {})

        # Get the Version from importlib
        # This will always show the version of the installed package, not the local development version
        from importlib.metadata import version, PackageNotFoundError
        try:
            AppConfig.APP_VERSION = version("cpdctrl-gui")
        except PackageNotFoundError:
            pass

    @classmethod
    def finalize(cls) -> None:
       """
       Write configuration to file
       """
       AppConfig.MAIN_CFG.save()
       AppConfig.MEAS_CFG.save()