{-# 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) 2013-2016 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 information about replication instances for your account in the
-- current region.
--
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.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'
--
-- * 'driMarker'
--
-- * 'driMaxRecords'
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 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

instance NFData DescribeReplicationInstances

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'
--
-- * 'drisrsReplicationInstances'
--
-- * 'drisrsResponseStatus'
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