# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

__all__ = [
    'Provider',
    'ContainerState'
]


class Type(object):
    @classmethod
    def tostring(cls, value):
        """Return the string representation of the state object attribute
        :param str value: the state object to turn into string
        :return: the uppercase string that represents the state object
        :rtype: str
        """
        return value.upper()

    @classmethod
    def fromstring(cls, value):
        """Return the state object attribute that matches the string
        :param str value: the string to look up
        :return: the state object attribute that matches the string
        :rtype: str
        """
        return getattr(cls, value.upper(), None)


class Provider(object):
    """
    Defines for each of the supported providers

    Non-Dummy drivers are sorted in alphabetical order. Please preserve this
    ordering when adding new drivers.
    """
    DUMMY = 'dummy'
    DOCKER = 'docker'
    ECS = 'ecs'
    GKE = 'GKE'
    JOYENT = 'joyent'
    KUBERNETES = 'kubernetes'
    LXD = 'lxd'
    RANCHER = 'rancher'


class ContainerState(Type):
    """
    Standard states for a container

    :cvar RUNNING: Container is running.
    :cvar REBOOTING: Container is rebooting.
    :cvar TERMINATED: Container is terminated.
                This container can't be started later on.
    :cvar STOPPED: Container is stopped.
                This container can be started later on.
    :cvar PENDING: Container is pending.
    :cvar SUSPENDED: Container is suspended.
    :cvar ERROR: Container is an error state.
                Usually no operations can be performed
                on the container once it ends up in the error state.
    :cvar PAUSED: Container is paused.
    :cvar UNKNOWN: Container state is unknown.
    """
    RUNNING = 'running'
    REBOOTING = 'rebooting'
    TERMINATED = 'terminated'
    PENDING = 'pending'
    UNKNOWN = 'unknown'
    STOPPED = 'stopped'
    SUSPENDED = 'suspended'
    ERROR = 'error'
    PAUSED = 'paused'