class ChannelException(Exception):
    def __init__(self, message: str, retryable: bool = False, retry_after_ms: int = 0):
        super().__init__(message)
        self.retryable = retryable
        self.retry_after_ms = retry_after_ms


class ChannelNotConnectedError(ChannelException):
    def __init__(self):
        super().__init__("Channel not connected", retryable=True, retry_after_ms=5000)


class ChannelConnectionError(ChannelException):
    def __init__(self, message: str = "Channel connection failed"):
        super().__init__(message, retryable=True, retry_after_ms=5000)


class ChannelAuthenticationError(ChannelException):
    def __init__(self, message: str = "Channel authentication failed"):
        super().__init__(message, retryable=False)


class ChannelRateLimitError(ChannelException):
    def __init__(self, retry_after_ms: int = 60000):
        super().__init__("Rate limited by channel", retryable=True, retry_after_ms=retry_after_ms)


class TokenExpiredError(ChannelException):
    def __init__(self):
        super().__init__("Access token expired", retryable=True, retry_after_ms=1000)


class MessageFormatError(ChannelException):
    def __init__(self):
        super().__init__("Invalid message format", retryable=False)


class DeliveryFailedError(ChannelException):
    def __init__(self, message: str = ""):
        detail = f"Message delivery failed: {message}" if message else "Message delivery failed"
        super().__init__(detail, retryable=True, retry_after_ms=3000)