{-# 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.ELB.DescribeInstanceHealth
-- Copyright   : (c) 2013-2015 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)
--
-- Describes the state of the specified instances registered with the
-- specified load balancer. If no instances are specified, the call
-- describes the state of all instances registered with the load balancer,
-- not including any terminated instances.
--
-- /See:/ <http://docs.aws.amazon.com/ElasticLoadBalancing/latest/APIReference/API_DescribeInstanceHealth.html AWS API Reference> for DescribeInstanceHealth.
module Network.AWS.ELB.DescribeInstanceHealth
    (
    -- * Creating a Request
      describeInstanceHealth
    , DescribeInstanceHealth
    -- * Request Lenses
    , dihInstances
    , dihLoadBalancerName

    -- * Destructuring the Response
    , describeInstanceHealthResponse
    , DescribeInstanceHealthResponse
    -- * Response Lenses
    , dihrsInstanceStates
    , dihrsResponseStatus
    ) where

import           Network.AWS.ELB.Types
import           Network.AWS.ELB.Types.Product
import           Network.AWS.Prelude
import           Network.AWS.Request
import           Network.AWS.Response

-- | /See:/ 'describeInstanceHealth' smart constructor.
data DescribeInstanceHealth = DescribeInstanceHealth'
    { _dihInstances        :: !(Maybe [Instance])
    , _dihLoadBalancerName :: !Text
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeInstanceHealth' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'dihInstances'
--
-- * 'dihLoadBalancerName'
describeInstanceHealth
    :: Text -- ^ 'dihLoadBalancerName'
    -> DescribeInstanceHealth
describeInstanceHealth pLoadBalancerName_ =
    DescribeInstanceHealth'
    { _dihInstances = Nothing
    , _dihLoadBalancerName = pLoadBalancerName_
    }

-- | The IDs of the instances.
dihInstances :: Lens' DescribeInstanceHealth [Instance]
dihInstances = lens _dihInstances (\ s a -> s{_dihInstances = a}) . _Default . _Coerce;

-- | The name of the load balancer.
dihLoadBalancerName :: Lens' DescribeInstanceHealth Text
dihLoadBalancerName = lens _dihLoadBalancerName (\ s a -> s{_dihLoadBalancerName = a});

instance AWSRequest DescribeInstanceHealth where
        type Rs DescribeInstanceHealth =
             DescribeInstanceHealthResponse
        request = postQuery eLB
        response
          = receiveXMLWrapper "DescribeInstanceHealthResult"
              (\ s h x ->
                 DescribeInstanceHealthResponse' <$>
                   (x .@? "InstanceStates" .!@ mempty >>=
                      may (parseXMLList "member"))
                     <*> (pure (fromEnum s)))

instance ToHeaders DescribeInstanceHealth where
        toHeaders = const mempty

instance ToPath DescribeInstanceHealth where
        toPath = const "/"

instance ToQuery DescribeInstanceHealth where
        toQuery DescribeInstanceHealth'{..}
          = mconcat
              ["Action" =:
                 ("DescribeInstanceHealth" :: ByteString),
               "Version" =: ("2012-06-01" :: ByteString),
               "Instances" =:
                 toQuery (toQueryList "member" <$> _dihInstances),
               "LoadBalancerName" =: _dihLoadBalancerName]

-- | /See:/ 'describeInstanceHealthResponse' smart constructor.
data DescribeInstanceHealthResponse = DescribeInstanceHealthResponse'
    { _dihrsInstanceStates :: !(Maybe [InstanceState])
    , _dihrsResponseStatus :: !Int
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeInstanceHealthResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'dihrsInstanceStates'
--
-- * 'dihrsResponseStatus'
describeInstanceHealthResponse
    :: Int -- ^ 'dihrsResponseStatus'
    -> DescribeInstanceHealthResponse
describeInstanceHealthResponse pResponseStatus_ =
    DescribeInstanceHealthResponse'
    { _dihrsInstanceStates = Nothing
    , _dihrsResponseStatus = pResponseStatus_
    }

-- | Information about the health of the instances.
dihrsInstanceStates :: Lens' DescribeInstanceHealthResponse [InstanceState]
dihrsInstanceStates = lens _dihrsInstanceStates (\ s a -> s{_dihrsInstanceStates = a}) . _Default . _Coerce;

-- | The response status code.
dihrsResponseStatus :: Lens' DescribeInstanceHealthResponse Int
dihrsResponseStatus = lens _dihrsResponseStatus (\ s a -> s{_dihrsResponseStatus = a});