class BaseStorageError(Exception):
    pass


class StorageActionNotImplemented(Exception):
    def __init__(self, storage, action, message='is not implemented'):
        self.storage = storage
        self.action = action
        self.message = message
        super().__init__(self.message)

    def __str__(self):
        return f'{self.action} on class {self.storage} {self.message}'


class FileDoesNotExist(BaseStorageError):
    def __init__(self, source, message='File does not exists on disk'):
        self.source = source
        self.message = message
        super().__init__(self.message)

    def __str__(self):
        return f'{self.source} -> {self.message}'


class InvalidLocation(BaseStorageError):
    def __init__(self, location, message='Location does not exists or is not valid'):
        self.location = location
        self.message = message
        super().__init__(self.message)

    def __str__(self):
        return f'{self.location} -> {self.message}'


class InvalidAuthentication(BaseStorageError):
    def __init__(self, user, message='Authentication failed'):
        self.user = user
        self.message = message
        super().__init__(self.message)

    def __str__(self):
        return f'{self.user} -> {self.message}'


class UnknownStorageEngine(BaseStorageError):
    def __init__(self, engine, message='Storage engine is unknown, not available'):
        self.engine = engine
        self.message = message
        super().__init__(self.message)

    def __str__(self):
        return f'{self.engine} -> {self.message}'


class MissingEncryptionKey(BaseStorageError):
    def __init__(self, message='The encryption keys are missing'):
        self.message = message
        super().__init__(self.message)

    def __str__(self):
        return f'{self.message}'