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# -*- coding: utf-8 -*-

"""
The MIT License (MIT)

Copyright (c) 2015-2016 Rapptz

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
"""

import abc

class Snowflake(metaclass=abc.ABCMeta):
    __slots__ = ()

    @property
    @abc.abstractmethod
    def created_at(self):
        raise NotImplementedError

    @classmethod
    def __subclasshook__(cls, C):
        if cls is Snowflake:
            mro = C.__mro__
            for attr in ('created_at', 'id'):
                for base in mro:
                    if attr in base.__dict__:
                        break
                else:
                    return NotImplemented
            return True
        return NotImplemented

class User(metaclass=abc.ABCMeta):
    __slots__ = ()

    @property
    @abc.abstractmethod
    def display_name(self):
        raise NotImplementedError

    @property
    @abc.abstractmethod
    def mention(self):
        raise NotImplementedError

    @classmethod
    def __subclasshook__(cls, C):
        if cls is User:
            if Snowflake.__subclasshook__(C) is NotImplemented:
                return NotImplemented

            mro = C.__mro__
            for attr in ('display_name', 'mention', 'name', 'avatar', 'discriminator', 'bot'):
                for base in mro:
                    if attr in base.__dict__:
                        break
                else:
                    return NotImplemented
            return True
        return NotImplemented