{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric      #-}
{-# LANGUAGE OverloadedStrings  #-}
{-# LANGUAGE RecordWildCards    #-}
{-# LANGUAGE TypeFamilies       #-}

{-# OPTIONS_GHC -fno-warn-unused-imports #-}
{-# OPTIONS_GHC -fno-warn-unused-binds   #-}
{-# OPTIONS_GHC -fno-warn-unused-matches #-}

-- Derived from AWS service descriptions, licensed under Apache 2.0.

-- |
-- Module      : Network.AWS.AutoScaling.DetachInstances
-- Copyright   : (c) 2013-2015 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay <brendan.g.hay@gmail.com>
-- Stability   : auto-generated
-- Portability : non-portable (GHC extensions)
--
-- Removes one or more instances from the specified Auto Scaling group.
-- After the instances are detached, you can manage them independently from
-- the rest of the Auto Scaling group.
--
-- For more information, see
-- <http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/detach-instance-asg.html Detach EC2 Instances from Your Auto Scaling Group>
-- in the /Auto Scaling Developer Guide/.
--
-- /See:/ <http://docs.aws.amazon.com/AutoScaling/latest/APIReference/API_DetachInstances.html AWS API Reference> for DetachInstances.
module Network.AWS.AutoScaling.DetachInstances
    (
    -- * Creating a Request
      detachInstances
    , DetachInstances
    -- * Request Lenses
    , diInstanceIds
    , diAutoScalingGroupName
    , diShouldDecrementDesiredCapacity

    -- * Destructuring the Response
    , detachInstancesResponse
    , DetachInstancesResponse
    -- * Response Lenses
    , dirsActivities
    , dirsStatus
    ) where

import           Network.AWS.AutoScaling.Types
import           Network.AWS.AutoScaling.Types.Product
import           Network.AWS.Prelude
import           Network.AWS.Request
import           Network.AWS.Response

-- | /See:/ 'detachInstances' smart constructor.
data DetachInstances = DetachInstances'
    { _diInstanceIds                    :: !(Maybe [Text])
    , _diAutoScalingGroupName           :: !Text
    , _diShouldDecrementDesiredCapacity :: !Bool
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DetachInstances' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'diInstanceIds'
--
-- * 'diAutoScalingGroupName'
--
-- * 'diShouldDecrementDesiredCapacity'
detachInstances
    :: Text -- ^ 'diAutoScalingGroupName'
    -> Bool -- ^ 'diShouldDecrementDesiredCapacity'
    -> DetachInstances
detachInstances pAutoScalingGroupName_ pShouldDecrementDesiredCapacity_ =
    DetachInstances'
    { _diInstanceIds = Nothing
    , _diAutoScalingGroupName = pAutoScalingGroupName_
    , _diShouldDecrementDesiredCapacity = pShouldDecrementDesiredCapacity_
    }

-- | One or more instance IDs.
diInstanceIds :: Lens' DetachInstances [Text]
diInstanceIds = lens _diInstanceIds (\ s a -> s{_diInstanceIds = a}) . _Default . _Coerce;

-- | The name of the group.
diAutoScalingGroupName :: Lens' DetachInstances Text
diAutoScalingGroupName = lens _diAutoScalingGroupName (\ s a -> s{_diAutoScalingGroupName = a});

-- | If 'True', the Auto Scaling group decrements the desired capacity value
-- by the number of instances detached.
diShouldDecrementDesiredCapacity :: Lens' DetachInstances Bool
diShouldDecrementDesiredCapacity = lens _diShouldDecrementDesiredCapacity (\ s a -> s{_diShouldDecrementDesiredCapacity = a});

instance AWSRequest DetachInstances where
        type Rs DetachInstances = DetachInstancesResponse
        request = postQuery autoScaling
        response
          = receiveXMLWrapper "DetachInstancesResult"
              (\ s h x ->
                 DetachInstancesResponse' <$>
                   (x .@? "Activities" .!@ mempty >>=
                      may (parseXMLList "member"))
                     <*> (pure (fromEnum s)))

instance ToHeaders DetachInstances where
        toHeaders = const mempty

instance ToPath DetachInstances where
        toPath = const "/"

instance ToQuery DetachInstances where
        toQuery DetachInstances'{..}
          = mconcat
              ["Action" =: ("DetachInstances" :: ByteString),
               "Version" =: ("2011-01-01" :: ByteString),
               "InstanceIds" =:
                 toQuery (toQueryList "member" <$> _diInstanceIds),
               "AutoScalingGroupName" =: _diAutoScalingGroupName,
               "ShouldDecrementDesiredCapacity" =:
                 _diShouldDecrementDesiredCapacity]

-- | /See:/ 'detachInstancesResponse' smart constructor.
data DetachInstancesResponse = DetachInstancesResponse'
    { _dirsActivities :: !(Maybe [Activity])
    , _dirsStatus     :: !Int
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DetachInstancesResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'dirsActivities'
--
-- * 'dirsStatus'
detachInstancesResponse
    :: Int -- ^ 'dirsStatus'
    -> DetachInstancesResponse
detachInstancesResponse pStatus_ =
    DetachInstancesResponse'
    { _dirsActivities = Nothing
    , _dirsStatus = pStatus_
    }

-- | The activities related to detaching the instances from the Auto Scaling
-- group.
dirsActivities :: Lens' DetachInstancesResponse [Activity]
dirsActivities = lens _dirsActivities (\ s a -> s{_dirsActivities = a}) . _Default . _Coerce;

-- | The response status code.
dirsStatus :: Lens' DetachInstancesResponse Int
dirsStatus = lens _dirsStatus (\ s a -> s{_dirsStatus = a});