{-# 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.Redshift.DescribeReservedNodes
-- 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)
--
-- Returns the descriptions of the reserved nodes.
--
-- This operation returns paginated results.
module Network.AWS.Redshift.DescribeReservedNodes
    (
    -- * Creating a Request
      describeReservedNodes
    , DescribeReservedNodes
    -- * Request Lenses
    , drnReservedNodeId
    , drnMarker
    , drnMaxRecords

    -- * Destructuring the Response
    , describeReservedNodesResponse
    , DescribeReservedNodesResponse
    -- * Response Lenses
    , drnrsReservedNodes
    , drnrsMarker
    , drnrsResponseStatus
    ) where

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

-- |
--
-- /See:/ 'describeReservedNodes' smart constructor.
data DescribeReservedNodes = DescribeReservedNodes'
    { _drnReservedNodeId :: !(Maybe Text)
    , _drnMarker         :: !(Maybe Text)
    , _drnMaxRecords     :: !(Maybe Int)
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeReservedNodes' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'drnReservedNodeId'
--
-- * 'drnMarker'
--
-- * 'drnMaxRecords'
describeReservedNodes
    :: DescribeReservedNodes
describeReservedNodes =
    DescribeReservedNodes'
    { _drnReservedNodeId = Nothing
    , _drnMarker = Nothing
    , _drnMaxRecords = Nothing
    }

-- | Identifier for the node reservation.
drnReservedNodeId :: Lens' DescribeReservedNodes (Maybe Text)
drnReservedNodeId = lens _drnReservedNodeId (\ s a -> s{_drnReservedNodeId = a});

-- | An optional parameter that specifies the starting point to return a set of response records. When the results of a < DescribeReservedNodes> request exceed the value specified in 'MaxRecords', AWS returns a value in the 'Marker' field of the response. You can retrieve the next set of response records by providing the returned marker value in the 'Marker' parameter and retrying the request.
drnMarker :: Lens' DescribeReservedNodes (Maybe Text)
drnMarker = lens _drnMarker (\ s a -> s{_drnMarker = a});

-- | The maximum number of response records to return in each call. If the number of remaining response records exceeds the specified 'MaxRecords' value, a value is returned in a 'marker' field of the response. You can retrieve the next set of records by retrying the command with the returned marker value.
--
-- Default: '100'
--
-- Constraints: minimum 20, maximum 100.
drnMaxRecords :: Lens' DescribeReservedNodes (Maybe Int)
drnMaxRecords = lens _drnMaxRecords (\ s a -> s{_drnMaxRecords = a});

instance AWSPager DescribeReservedNodes where
        page rq rs
          | stop (rs ^. drnrsMarker) = Nothing
          | stop (rs ^. drnrsReservedNodes) = Nothing
          | otherwise =
            Just $ rq & drnMarker .~ rs ^. drnrsMarker

instance AWSRequest DescribeReservedNodes where
        type Rs DescribeReservedNodes =
             DescribeReservedNodesResponse
        request = postQuery redshift
        response
          = receiveXMLWrapper "DescribeReservedNodesResult"
              (\ s h x ->
                 DescribeReservedNodesResponse' <$>
                   (x .@? "ReservedNodes" .!@ mempty >>=
                      may (parseXMLList "ReservedNode"))
                     <*> (x .@? "Marker")
                     <*> (pure (fromEnum s)))

instance Hashable DescribeReservedNodes

instance NFData DescribeReservedNodes

instance ToHeaders DescribeReservedNodes where
        toHeaders = const mempty

instance ToPath DescribeReservedNodes where
        toPath = const "/"

instance ToQuery DescribeReservedNodes where
        toQuery DescribeReservedNodes'{..}
          = mconcat
              ["Action" =: ("DescribeReservedNodes" :: ByteString),
               "Version" =: ("2012-12-01" :: ByteString),
               "ReservedNodeId" =: _drnReservedNodeId,
               "Marker" =: _drnMarker,
               "MaxRecords" =: _drnMaxRecords]

-- |
--
-- /See:/ 'describeReservedNodesResponse' smart constructor.
data DescribeReservedNodesResponse = DescribeReservedNodesResponse'
    { _drnrsReservedNodes  :: !(Maybe [ReservedNode])
    , _drnrsMarker         :: !(Maybe Text)
    , _drnrsResponseStatus :: !Int
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeReservedNodesResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'drnrsReservedNodes'
--
-- * 'drnrsMarker'
--
-- * 'drnrsResponseStatus'
describeReservedNodesResponse
    :: Int -- ^ 'drnrsResponseStatus'
    -> DescribeReservedNodesResponse
describeReservedNodesResponse pResponseStatus_ =
    DescribeReservedNodesResponse'
    { _drnrsReservedNodes = Nothing
    , _drnrsMarker = Nothing
    , _drnrsResponseStatus = pResponseStatus_
    }

-- | The list of 'ReservedNode' objects.
drnrsReservedNodes :: Lens' DescribeReservedNodesResponse [ReservedNode]
drnrsReservedNodes = lens _drnrsReservedNodes (\ s a -> s{_drnrsReservedNodes = a}) . _Default . _Coerce;

-- | A value that indicates the starting point for the next set of response records in a subsequent request. If a value is returned in a response, you can retrieve the next set of records by providing this returned marker value in the 'Marker' parameter and retrying the command. If the 'Marker' field is empty, all response records have been retrieved for the request.
drnrsMarker :: Lens' DescribeReservedNodesResponse (Maybe Text)
drnrsMarker = lens _drnrsMarker (\ s a -> s{_drnrsMarker = a});

-- | The response status code.
drnrsResponseStatus :: Lens' DescribeReservedNodesResponse Int
drnrsResponseStatus = lens _drnrsResponseStatus (\ s a -> s{_drnrsResponseStatus = a});

instance NFData DescribeReservedNodesResponse