class RemoteException(Exception):
    pass

class RemoteNewsgroup():
    __slots__ = 'name',

    def __init__(self, name: str):
        self.name: str = name

    def __str__(self):
        return self.name

class RemoteNewsgroupDescription(RemoteNewsgroup):
    __slots__ = 'name', 'description',

    def __init__(self, name: str, description: str):
        super().__init__(name)

        self.description: str = description

    def __str__(self):
        return "%s %s" % (
            self.name, self.description
        )

class RemoteNewsgroupSummary(RemoteNewsgroup):
    __slots__ = 'name', 'low', 'high', 'post',
    
    def __init__(self, name: str, low: int, high: int, post: bool):
        super().__init__(name)
        
        self.low:  int  = low
        self.high: int  = high
        self.post: bool = post

    def __str__(self):
        return "%s %d %d %s" % (
            self.name,
            self.low,
            self.high,
            'y' if self.post else 'n'
        )

class RemoteMessageOverview():
    __slots__ = (
        'id', 'subject', 'sender', 'created_on', 'message_id',
        'references', 'size', 'lines', 'headers'
    )

    def __init__(self):
        self.headers = dict()