from api.utils.helper import Singleton


__all__ = ['settings']


class Settings(object):

    __metaclass__ = Singleton

    def __init__(self):
        self._config = {}
        self.config_file = '/usr/src/app/config/settings.conf'

    def init_config_from_file(self, config_file: str=None):
        if config_file:
            self.config_file = config_file
        try:
            with open(config_file, 'r') as f:
                data = f.readlines()
        except Exception:
            data = []
        for i in data:
            i = i.replace('\n', '').replace('\r\n', '')
            key, value = i.split('=')
            if self._config.get(key) != value:
                self._config[key] = value

    def update_setting(self, key: str, value: str):
        self._config[key] = value
        self.flush_config()

    def get_setting(self, key: str, default=None):
        return self._config.get(key, default)

    def list_all_settings(self) -> list:
        return self._config

    def delete_setting(self, key: str, value: str):
        if key in self._config:
            del self._config[key]

    def flush_config(self):
        with open(self.config_file, 'w') as f:
            for key, value in self._config.items():
                f.write(f'{key}={value}\n')



settings = Settings()