class BasicException(Exception):
    def __init__(self, msg, **kwargs):
        self.msg = msg
        self.kwargs = kwargs

    def __str__(self):
        if len(self.kwargs) > 2:
            params = "".join("{}={}, ".format(k, v) for k, v in self.kwargs.items())

            # Remove the extra 2 characters (space and comma) and add all data to the final message.
            message = self.msg + " ({})".format(params[:-2])

        else:
            message = self.msg

        return message

    def to_json(self):
        response = {"error": self.msg}
        response.update(self.kwargs)
        return response


class InvalidParameter(BasicException):
    """Raised when a command line parameter is invalid (either missing or wrong)"""


class InvalidKey(BasicException):
    """Raised when there is an error loading the keys"""


class EncryptionError(BasicException):
    """Raised when there is an error with encryption related functions, covers decryption"""


class SignatureError(BasicException):
    """Raised when there is an with the signature related functions, covers EC recover"""