{-# 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.DescribeEventSubscriptions
-- 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)
--
-- Lists descriptions of all the Amazon Redshift event notifications subscription for a customer account. If you specify a subscription name, lists the description for that subscription.
--
-- This operation returns paginated results.
module Network.AWS.Redshift.DescribeEventSubscriptions
    (
    -- * Creating a Request
      describeEventSubscriptions
    , DescribeEventSubscriptions
    -- * Request Lenses
    , dessSubscriptionName
    , dessMarker
    , dessMaxRecords

    -- * Destructuring the Response
    , describeEventSubscriptionsResponse
    , DescribeEventSubscriptionsResponse
    -- * Response Lenses
    , desrsEventSubscriptionsList
    , desrsMarker
    , desrsResponseStatus
    ) 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:/ 'describeEventSubscriptions' smart constructor.
data DescribeEventSubscriptions = DescribeEventSubscriptions'
    { _dessSubscriptionName :: !(Maybe Text)
    , _dessMarker           :: !(Maybe Text)
    , _dessMaxRecords       :: !(Maybe Int)
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeEventSubscriptions' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'dessSubscriptionName'
--
-- * 'dessMarker'
--
-- * 'dessMaxRecords'
describeEventSubscriptions
    :: DescribeEventSubscriptions
describeEventSubscriptions =
    DescribeEventSubscriptions'
    { _dessSubscriptionName = Nothing
    , _dessMarker = Nothing
    , _dessMaxRecords = Nothing
    }

-- | The name of the Amazon Redshift event notification subscription to be described.
dessSubscriptionName :: Lens' DescribeEventSubscriptions (Maybe Text)
dessSubscriptionName = lens _dessSubscriptionName (\ s a -> s{_dessSubscriptionName = a});

-- | An optional parameter that specifies the starting point to return a set of response records. When the results of a < DescribeEventSubscriptions> 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.
dessMarker :: Lens' DescribeEventSubscriptions (Maybe Text)
dessMarker = lens _dessMarker (\ s a -> s{_dessMarker = 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.
dessMaxRecords :: Lens' DescribeEventSubscriptions (Maybe Int)
dessMaxRecords = lens _dessMaxRecords (\ s a -> s{_dessMaxRecords = a});

instance AWSPager DescribeEventSubscriptions where
        page rq rs
          | stop (rs ^. desrsMarker) = Nothing
          | stop (rs ^. desrsEventSubscriptionsList) = Nothing
          | otherwise =
            Just $ rq & dessMarker .~ rs ^. desrsMarker

instance AWSRequest DescribeEventSubscriptions where
        type Rs DescribeEventSubscriptions =
             DescribeEventSubscriptionsResponse
        request = postQuery redshift
        response
          = receiveXMLWrapper
              "DescribeEventSubscriptionsResult"
              (\ s h x ->
                 DescribeEventSubscriptionsResponse' <$>
                   (x .@? "EventSubscriptionsList" .!@ mempty >>=
                      may (parseXMLList "EventSubscription"))
                     <*> (x .@? "Marker")
                     <*> (pure (fromEnum s)))

instance Hashable DescribeEventSubscriptions

instance NFData DescribeEventSubscriptions

instance ToHeaders DescribeEventSubscriptions where
        toHeaders = const mempty

instance ToPath DescribeEventSubscriptions where
        toPath = const "/"

instance ToQuery DescribeEventSubscriptions where
        toQuery DescribeEventSubscriptions'{..}
          = mconcat
              ["Action" =:
                 ("DescribeEventSubscriptions" :: ByteString),
               "Version" =: ("2012-12-01" :: ByteString),
               "SubscriptionName" =: _dessSubscriptionName,
               "Marker" =: _dessMarker,
               "MaxRecords" =: _dessMaxRecords]

-- |
--
-- /See:/ 'describeEventSubscriptionsResponse' smart constructor.
data DescribeEventSubscriptionsResponse = DescribeEventSubscriptionsResponse'
    { _desrsEventSubscriptionsList :: !(Maybe [EventSubscription])
    , _desrsMarker                 :: !(Maybe Text)
    , _desrsResponseStatus         :: !Int
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeEventSubscriptionsResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'desrsEventSubscriptionsList'
--
-- * 'desrsMarker'
--
-- * 'desrsResponseStatus'
describeEventSubscriptionsResponse
    :: Int -- ^ 'desrsResponseStatus'
    -> DescribeEventSubscriptionsResponse
describeEventSubscriptionsResponse pResponseStatus_ =
    DescribeEventSubscriptionsResponse'
    { _desrsEventSubscriptionsList = Nothing
    , _desrsMarker = Nothing
    , _desrsResponseStatus = pResponseStatus_
    }

-- | A list of event subscriptions.
desrsEventSubscriptionsList :: Lens' DescribeEventSubscriptionsResponse [EventSubscription]
desrsEventSubscriptionsList = lens _desrsEventSubscriptionsList (\ s a -> s{_desrsEventSubscriptionsList = 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.
desrsMarker :: Lens' DescribeEventSubscriptionsResponse (Maybe Text)
desrsMarker = lens _desrsMarker (\ s a -> s{_desrsMarker = a});

-- | The response status code.
desrsResponseStatus :: Lens' DescribeEventSubscriptionsResponse Int
desrsResponseStatus = lens _desrsResponseStatus (\ s a -> s{_desrsResponseStatus = a});

instance NFData DescribeEventSubscriptionsResponse