{-# 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.ElastiCache.DescribeCacheSubnetGroups
-- Copyright   : (c) 2013-2017 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay <brendan.g.hay+amazonka@gmail.com>
-- Stability   : auto-generated
-- Portability : non-portable (GHC extensions)
--
-- Returns a list of cache subnet group descriptions. If a subnet group name is specified, the list contains only the description of that group.
--
--
--
-- This operation returns paginated results.
module Network.AWS.ElastiCache.DescribeCacheSubnetGroups
    (
    -- * Creating a Request
      describeCacheSubnetGroups
    , DescribeCacheSubnetGroups
    -- * Request Lenses
    , dcsgCacheSubnetGroupName
    , dcsgMarker
    , dcsgMaxRecords

    -- * Destructuring the Response
    , describeCacheSubnetGroupsResponse
    , DescribeCacheSubnetGroupsResponse
    -- * Response Lenses
    , dcsgrsMarker
    , dcsgrsCacheSubnetGroups
    , dcsgrsResponseStatus
    ) where

import Network.AWS.ElastiCache.Types
import Network.AWS.ElastiCache.Types.Product
import Network.AWS.Lens
import Network.AWS.Pager
import Network.AWS.Prelude
import Network.AWS.Request
import Network.AWS.Response

-- | Represents the input of a @DescribeCacheSubnetGroups@ operation.
--
--
--
-- /See:/ 'describeCacheSubnetGroups' smart constructor.
data DescribeCacheSubnetGroups = DescribeCacheSubnetGroups'
  { _dcsgCacheSubnetGroupName :: !(Maybe Text)
  , _dcsgMarker               :: !(Maybe Text)
  , _dcsgMaxRecords           :: !(Maybe Int)
  } deriving (Eq, Read, Show, Data, Typeable, Generic)


-- | Creates a value of 'DescribeCacheSubnetGroups' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'dcsgCacheSubnetGroupName' - The name of the cache subnet group to return details for.
--
-- * 'dcsgMarker' - An optional marker returned from a prior request. Use this marker for pagination of results from this operation. If this parameter is specified, the response includes only records beyond the marker, up to the value specified by @MaxRecords@ .
--
-- * 'dcsgMaxRecords' - The maximum number of records to include in the response. If more records exist than the specified @MaxRecords@ value, a marker is included in the response so that the remaining results can be retrieved. Default: 100 Constraints: minimum 20; maximum 100.
describeCacheSubnetGroups
    :: DescribeCacheSubnetGroups
describeCacheSubnetGroups =
  DescribeCacheSubnetGroups'
  { _dcsgCacheSubnetGroupName = Nothing
  , _dcsgMarker = Nothing
  , _dcsgMaxRecords = Nothing
  }


-- | The name of the cache subnet group to return details for.
dcsgCacheSubnetGroupName :: Lens' DescribeCacheSubnetGroups (Maybe Text)
dcsgCacheSubnetGroupName = lens _dcsgCacheSubnetGroupName (\ s a -> s{_dcsgCacheSubnetGroupName = a});

-- | An optional marker returned from a prior request. Use this marker for pagination of results from this operation. If this parameter is specified, the response includes only records beyond the marker, up to the value specified by @MaxRecords@ .
dcsgMarker :: Lens' DescribeCacheSubnetGroups (Maybe Text)
dcsgMarker = lens _dcsgMarker (\ s a -> s{_dcsgMarker = a});

-- | The maximum number of records to include in the response. If more records exist than the specified @MaxRecords@ value, a marker is included in the response so that the remaining results can be retrieved. Default: 100 Constraints: minimum 20; maximum 100.
dcsgMaxRecords :: Lens' DescribeCacheSubnetGroups (Maybe Int)
dcsgMaxRecords = lens _dcsgMaxRecords (\ s a -> s{_dcsgMaxRecords = a});

instance AWSPager DescribeCacheSubnetGroups where
        page rq rs
          | stop (rs ^. dcsgrsMarker) = Nothing
          | stop (rs ^. dcsgrsCacheSubnetGroups) = Nothing
          | otherwise =
            Just $ rq & dcsgMarker .~ rs ^. dcsgrsMarker

instance AWSRequest DescribeCacheSubnetGroups where
        type Rs DescribeCacheSubnetGroups =
             DescribeCacheSubnetGroupsResponse
        request = postQuery elastiCache
        response
          = receiveXMLWrapper "DescribeCacheSubnetGroupsResult"
              (\ s h x ->
                 DescribeCacheSubnetGroupsResponse' <$>
                   (x .@? "Marker") <*>
                     (x .@? "CacheSubnetGroups" .!@ mempty >>=
                        may (parseXMLList "CacheSubnetGroup"))
                     <*> (pure (fromEnum s)))

instance Hashable DescribeCacheSubnetGroups where

instance NFData DescribeCacheSubnetGroups where

instance ToHeaders DescribeCacheSubnetGroups where
        toHeaders = const mempty

instance ToPath DescribeCacheSubnetGroups where
        toPath = const "/"

instance ToQuery DescribeCacheSubnetGroups where
        toQuery DescribeCacheSubnetGroups'{..}
          = mconcat
              ["Action" =:
                 ("DescribeCacheSubnetGroups" :: ByteString),
               "Version" =: ("2015-02-02" :: ByteString),
               "CacheSubnetGroupName" =: _dcsgCacheSubnetGroupName,
               "Marker" =: _dcsgMarker,
               "MaxRecords" =: _dcsgMaxRecords]

-- | Represents the output of a @DescribeCacheSubnetGroups@ operation.
--
--
--
-- /See:/ 'describeCacheSubnetGroupsResponse' smart constructor.
data DescribeCacheSubnetGroupsResponse = DescribeCacheSubnetGroupsResponse'
  { _dcsgrsMarker            :: !(Maybe Text)
  , _dcsgrsCacheSubnetGroups :: !(Maybe [CacheSubnetGroup])
  , _dcsgrsResponseStatus    :: !Int
  } deriving (Eq, Read, Show, Data, Typeable, Generic)


-- | Creates a value of 'DescribeCacheSubnetGroupsResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'dcsgrsMarker' - Provides an identifier to allow retrieval of paginated results.
--
-- * 'dcsgrsCacheSubnetGroups' - A list of cache subnet groups. Each element in the list contains detailed information about one group.
--
-- * 'dcsgrsResponseStatus' - -- | The response status code.
describeCacheSubnetGroupsResponse
    :: Int -- ^ 'dcsgrsResponseStatus'
    -> DescribeCacheSubnetGroupsResponse
describeCacheSubnetGroupsResponse pResponseStatus_ =
  DescribeCacheSubnetGroupsResponse'
  { _dcsgrsMarker = Nothing
  , _dcsgrsCacheSubnetGroups = Nothing
  , _dcsgrsResponseStatus = pResponseStatus_
  }


-- | Provides an identifier to allow retrieval of paginated results.
dcsgrsMarker :: Lens' DescribeCacheSubnetGroupsResponse (Maybe Text)
dcsgrsMarker = lens _dcsgrsMarker (\ s a -> s{_dcsgrsMarker = a});

-- | A list of cache subnet groups. Each element in the list contains detailed information about one group.
dcsgrsCacheSubnetGroups :: Lens' DescribeCacheSubnetGroupsResponse [CacheSubnetGroup]
dcsgrsCacheSubnetGroups = lens _dcsgrsCacheSubnetGroups (\ s a -> s{_dcsgrsCacheSubnetGroups = a}) . _Default . _Coerce;

-- | -- | The response status code.
dcsgrsResponseStatus :: Lens' DescribeCacheSubnetGroupsResponse Int
dcsgrsResponseStatus = lens _dcsgrsResponseStatus (\ s a -> s{_dcsgrsResponseStatus = a});

instance NFData DescribeCacheSubnetGroupsResponse
         where