{-# 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.DMS.DescribeReplicationInstances
-- Copyright   : (c) 2013-2018 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 information about replication instances for your account in the current region.
--
--
--
-- This operation returns paginated results.
module Network.AWS.DMS.DescribeReplicationInstances
    (
    -- * Creating a Request
      describeReplicationInstances
    , DescribeReplicationInstances
    -- * Request Lenses
    , driFilters
    , driMarker
    , driMaxRecords

    -- * Destructuring the Response
    , describeReplicationInstancesResponse
    , DescribeReplicationInstancesResponse
    -- * Response Lenses
    , drisrsMarker
    , drisrsReplicationInstances
    , drisrsResponseStatus
    ) where

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

-- |
--
--
--
-- /See:/ 'describeReplicationInstances' smart constructor.
data DescribeReplicationInstances = DescribeReplicationInstances'
  { _driFilters    :: !(Maybe [Filter])
  , _driMarker     :: !(Maybe Text)
  , _driMaxRecords :: !(Maybe Int)
  } deriving (Eq, Read, Show, Data, Typeable, Generic)


-- | Creates a value of 'DescribeReplicationInstances' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'driFilters' - Filters applied to the describe action. Valid filter names: replication-instance-arn | replication-instance-id | replication-instance-class | engine-version
--
-- * 'driMarker' - An optional pagination token provided by a previous request. If this parameter is specified, the response includes only records beyond the marker, up to the value specified by @MaxRecords@ .
--
-- * 'driMaxRecords' - The maximum number of records to include in the response. If more records exist than the specified @MaxRecords@ value, a pagination token called a marker is included in the response so that the remaining results can be retrieved.  Default: 100 Constraints: Minimum 20, maximum 100.
describeReplicationInstances
    :: DescribeReplicationInstances
describeReplicationInstances =
  DescribeReplicationInstances'
    {_driFilters = Nothing, _driMarker = Nothing, _driMaxRecords = Nothing}


-- | Filters applied to the describe action. Valid filter names: replication-instance-arn | replication-instance-id | replication-instance-class | engine-version
driFilters :: Lens' DescribeReplicationInstances [Filter]
driFilters = lens _driFilters (\ s a -> s{_driFilters = a}) . _Default . _Coerce

-- | An optional pagination token provided by a previous request. If this parameter is specified, the response includes only records beyond the marker, up to the value specified by @MaxRecords@ .
driMarker :: Lens' DescribeReplicationInstances (Maybe Text)
driMarker = lens _driMarker (\ s a -> s{_driMarker = a})

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

instance AWSPager DescribeReplicationInstances where
        page rq rs
          | stop (rs ^. drisrsMarker) = Nothing
          | stop (rs ^. drisrsReplicationInstances) = Nothing
          | otherwise =
            Just $ rq & driMarker .~ rs ^. drisrsMarker

instance AWSRequest DescribeReplicationInstances
         where
        type Rs DescribeReplicationInstances =
             DescribeReplicationInstancesResponse
        request = postJSON dms
        response
          = receiveJSON
              (\ s h x ->
                 DescribeReplicationInstancesResponse' <$>
                   (x .?> "Marker") <*>
                     (x .?> "ReplicationInstances" .!@ mempty)
                     <*> (pure (fromEnum s)))

instance Hashable DescribeReplicationInstances where

instance NFData DescribeReplicationInstances where

instance ToHeaders DescribeReplicationInstances where
        toHeaders
          = const
              (mconcat
                 ["X-Amz-Target" =#
                    ("AmazonDMSv20160101.DescribeReplicationInstances" ::
                       ByteString),
                  "Content-Type" =#
                    ("application/x-amz-json-1.1" :: ByteString)])

instance ToJSON DescribeReplicationInstances where
        toJSON DescribeReplicationInstances'{..}
          = object
              (catMaybes
                 [("Filters" .=) <$> _driFilters,
                  ("Marker" .=) <$> _driMarker,
                  ("MaxRecords" .=) <$> _driMaxRecords])

instance ToPath DescribeReplicationInstances where
        toPath = const "/"

instance ToQuery DescribeReplicationInstances where
        toQuery = const mempty

-- |
--
--
--
-- /See:/ 'describeReplicationInstancesResponse' smart constructor.
data DescribeReplicationInstancesResponse = DescribeReplicationInstancesResponse'
  { _drisrsMarker               :: !(Maybe Text)
  , _drisrsReplicationInstances :: !(Maybe [ReplicationInstance])
  , _drisrsResponseStatus       :: !Int
  } deriving (Eq, Read, Show, Data, Typeable, Generic)


-- | Creates a value of 'DescribeReplicationInstancesResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'drisrsMarker' - An optional pagination token provided by a previous request. If this parameter is specified, the response includes only records beyond the marker, up to the value specified by @MaxRecords@ .
--
-- * 'drisrsReplicationInstances' - The replication instances described.
--
-- * 'drisrsResponseStatus' - -- | The response status code.
describeReplicationInstancesResponse
    :: Int -- ^ 'drisrsResponseStatus'
    -> DescribeReplicationInstancesResponse
describeReplicationInstancesResponse pResponseStatus_ =
  DescribeReplicationInstancesResponse'
    { _drisrsMarker = Nothing
    , _drisrsReplicationInstances = Nothing
    , _drisrsResponseStatus = pResponseStatus_
    }


-- | An optional pagination token provided by a previous request. If this parameter is specified, the response includes only records beyond the marker, up to the value specified by @MaxRecords@ .
drisrsMarker :: Lens' DescribeReplicationInstancesResponse (Maybe Text)
drisrsMarker = lens _drisrsMarker (\ s a -> s{_drisrsMarker = a})

-- | The replication instances described.
drisrsReplicationInstances :: Lens' DescribeReplicationInstancesResponse [ReplicationInstance]
drisrsReplicationInstances = lens _drisrsReplicationInstances (\ s a -> s{_drisrsReplicationInstances = a}) . _Default . _Coerce

-- | -- | The response status code.
drisrsResponseStatus :: Lens' DescribeReplicationInstancesResponse Int
drisrsResponseStatus = lens _drisrsResponseStatus (\ s a -> s{_drisrsResponseStatus = a})

instance NFData DescribeReplicationInstancesResponse
         where