{-# 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.ApplicationAutoScaling.DescribeScalableTargets
-- Copyright   : (c) 2013-2016 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)
--
-- Provides descriptive information for scalable targets with a specified
-- service namespace.
--
-- You can filter the results in a service namespace with the 'ResourceIds'
-- and 'ScalableDimension' parameters.
--
-- To create a new scalable target or update an existing one, see
-- < RegisterScalableTarget>. If you are no longer using a scalable target,
-- you can deregister it with < DeregisterScalableTarget>.
module Network.AWS.ApplicationAutoScaling.DescribeScalableTargets
    (
    -- * Creating a Request
      describeScalableTargets
    , DescribeScalableTargets
    -- * Request Lenses
    , dstResourceIds
    , dstScalableDimension
    , dstNextToken
    , dstMaxResults
    , dstServiceNamespace

    -- * Destructuring the Response
    , describeScalableTargetsResponse
    , DescribeScalableTargetsResponse
    -- * Response Lenses
    , dstsrsNextToken
    , dstsrsScalableTargets
    , dstsrsResponseStatus
    ) where

import           Network.AWS.ApplicationAutoScaling.Types
import           Network.AWS.ApplicationAutoScaling.Types.Product
import           Network.AWS.Lens
import           Network.AWS.Prelude
import           Network.AWS.Request
import           Network.AWS.Response

-- | /See:/ 'describeScalableTargets' smart constructor.
data DescribeScalableTargets = DescribeScalableTargets'
    { _dstResourceIds       :: !(Maybe [Text])
    , _dstScalableDimension :: !(Maybe ScalableDimension)
    , _dstNextToken         :: !(Maybe Text)
    , _dstMaxResults        :: !(Maybe Int)
    , _dstServiceNamespace  :: !ServiceNamespace
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeScalableTargets' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'dstResourceIds'
--
-- * 'dstScalableDimension'
--
-- * 'dstNextToken'
--
-- * 'dstMaxResults'
--
-- * 'dstServiceNamespace'
describeScalableTargets
    :: ServiceNamespace -- ^ 'dstServiceNamespace'
    -> DescribeScalableTargets
describeScalableTargets pServiceNamespace_ =
    DescribeScalableTargets'
    { _dstResourceIds = Nothing
    , _dstScalableDimension = Nothing
    , _dstNextToken = Nothing
    , _dstMaxResults = Nothing
    , _dstServiceNamespace = pServiceNamespace_
    }

-- | The unique identifier string for the resource associated with the
-- scalable target. For Amazon ECS services, this value is the resource
-- type, followed by the cluster name and service name, such as
-- 'service\/default\/sample-webapp'. If you specify a scalable dimension,
-- you must also specify a resource ID.
dstResourceIds :: Lens' DescribeScalableTargets [Text]
dstResourceIds = lens _dstResourceIds (\ s a -> s{_dstResourceIds = a}) . _Default . _Coerce;

-- | The scalable dimension associated with the scalable target. The scalable
-- dimension contains the service namespace, resource type, and scaling
-- property, such as 'ecs:service:DesiredCount' for the desired task count
-- of an Amazon ECS service. If you specify a scalable dimension, you must
-- also specify a resource ID.
dstScalableDimension :: Lens' DescribeScalableTargets (Maybe ScalableDimension)
dstScalableDimension = lens _dstScalableDimension (\ s a -> s{_dstScalableDimension = a});

-- | The 'NextToken' value returned from a previous paginated
-- 'DescribeScalableTargets' request. Pagination continues from the end of
-- the previous results that returned the 'NextToken' value. This value is
-- 'null' when there are no more results to return.
dstNextToken :: Lens' DescribeScalableTargets (Maybe Text)
dstNextToken = lens _dstNextToken (\ s a -> s{_dstNextToken = a});

-- | The maximum number of scalable target results returned by
-- 'DescribeScalableTargets' in paginated output. When this parameter is
-- used, 'DescribeScalableTargets' returns up to 'MaxResults' results in a
-- single page along with a 'NextToken' response element. The remaining
-- results of the initial request can be seen by sending another
-- 'DescribeScalableTargets' request with the returned 'NextToken' value.
-- This value can be between 1 and 50. If this parameter is not used, then
-- 'DescribeScalableTargets' returns up to 50 results and a 'NextToken'
-- value, if applicable.
dstMaxResults :: Lens' DescribeScalableTargets (Maybe Int)
dstMaxResults = lens _dstMaxResults (\ s a -> s{_dstMaxResults = a});

-- | The namespace for the AWS service that the scalable target is associated
-- with. For more information, see
-- <http://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html#genref-aws-service-namespaces AWS Service Namespaces>
-- in the Amazon Web Services General Reference.
dstServiceNamespace :: Lens' DescribeScalableTargets ServiceNamespace
dstServiceNamespace = lens _dstServiceNamespace (\ s a -> s{_dstServiceNamespace = a});

instance AWSRequest DescribeScalableTargets where
        type Rs DescribeScalableTargets =
             DescribeScalableTargetsResponse
        request = postJSON applicationAutoScaling
        response
          = receiveJSON
              (\ s h x ->
                 DescribeScalableTargetsResponse' <$>
                   (x .?> "NextToken") <*>
                     (x .?> "ScalableTargets" .!@ mempty)
                     <*> (pure (fromEnum s)))

instance Hashable DescribeScalableTargets

instance NFData DescribeScalableTargets

instance ToHeaders DescribeScalableTargets where
        toHeaders
          = const
              (mconcat
                 ["X-Amz-Target" =#
                    ("AnyScaleFrontendService.DescribeScalableTargets" ::
                       ByteString),
                  "Content-Type" =#
                    ("application/x-amz-json-1.1" :: ByteString)])

instance ToJSON DescribeScalableTargets where
        toJSON DescribeScalableTargets'{..}
          = object
              (catMaybes
                 [("ResourceIds" .=) <$> _dstResourceIds,
                  ("ScalableDimension" .=) <$> _dstScalableDimension,
                  ("NextToken" .=) <$> _dstNextToken,
                  ("MaxResults" .=) <$> _dstMaxResults,
                  Just ("ServiceNamespace" .= _dstServiceNamespace)])

instance ToPath DescribeScalableTargets where
        toPath = const "/"

instance ToQuery DescribeScalableTargets where
        toQuery = const mempty

-- | /See:/ 'describeScalableTargetsResponse' smart constructor.
data DescribeScalableTargetsResponse = DescribeScalableTargetsResponse'
    { _dstsrsNextToken       :: !(Maybe Text)
    , _dstsrsScalableTargets :: !(Maybe [ScalableTarget])
    , _dstsrsResponseStatus  :: !Int
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeScalableTargetsResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'dstsrsNextToken'
--
-- * 'dstsrsScalableTargets'
--
-- * 'dstsrsResponseStatus'
describeScalableTargetsResponse
    :: Int -- ^ 'dstsrsResponseStatus'
    -> DescribeScalableTargetsResponse
describeScalableTargetsResponse pResponseStatus_ =
    DescribeScalableTargetsResponse'
    { _dstsrsNextToken = Nothing
    , _dstsrsScalableTargets = Nothing
    , _dstsrsResponseStatus = pResponseStatus_
    }

-- | The 'NextToken' value to include in a future 'DescribeScalableTargets'
-- request. When the results of a 'DescribeScalableTargets' request exceed
-- 'MaxResults', this value can be used to retrieve the next page of
-- results. This value is 'null' when there are no more results to return.
dstsrsNextToken :: Lens' DescribeScalableTargetsResponse (Maybe Text)
dstsrsNextToken = lens _dstsrsNextToken (\ s a -> s{_dstsrsNextToken = a});

-- | The list of scalable targets that matches the request parameters.
dstsrsScalableTargets :: Lens' DescribeScalableTargetsResponse [ScalableTarget]
dstsrsScalableTargets = lens _dstsrsScalableTargets (\ s a -> s{_dstsrsScalableTargets = a}) . _Default . _Coerce;

-- | The response status code.
dstsrsResponseStatus :: Lens' DescribeScalableTargetsResponse Int
dstsrsResponseStatus = lens _dstsrsResponseStatus (\ s a -> s{_dstsrsResponseStatus = a});

instance NFData DescribeScalableTargetsResponse