{-# 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.EC2.DescribeClassicLinkInstances
-- 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)
--
-- Describes one or more of your linked EC2-Classic instances. This request only returns information about EC2-Classic instances linked to a VPC through ClassicLink; you cannot use this request to return information about other instances.
module Network.AWS.EC2.DescribeClassicLinkInstances
    (
    -- * Creating a Request
      describeClassicLinkInstances
    , DescribeClassicLinkInstances
    -- * Request Lenses
    , dcliFilters
    , dcliNextToken
    , dcliInstanceIds
    , dcliDryRun
    , dcliMaxResults

    -- * Destructuring the Response
    , describeClassicLinkInstancesResponse
    , DescribeClassicLinkInstancesResponse
    -- * Response Lenses
    , dclirsNextToken
    , dclirsInstances
    , dclirsResponseStatus
    ) where

import           Network.AWS.EC2.Types
import           Network.AWS.EC2.Types.Product
import           Network.AWS.Lens
import           Network.AWS.Prelude
import           Network.AWS.Request
import           Network.AWS.Response

-- | Contains the parameters for DescribeClassicLinkInstances.
--
-- /See:/ 'describeClassicLinkInstances' smart constructor.
data DescribeClassicLinkInstances = DescribeClassicLinkInstances'
    { _dcliFilters     :: !(Maybe [Filter])
    , _dcliNextToken   :: !(Maybe Text)
    , _dcliInstanceIds :: !(Maybe [Text])
    , _dcliDryRun      :: !(Maybe Bool)
    , _dcliMaxResults  :: !(Maybe Int)
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeClassicLinkInstances' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'dcliFilters'
--
-- * 'dcliNextToken'
--
-- * 'dcliInstanceIds'
--
-- * 'dcliDryRun'
--
-- * 'dcliMaxResults'
describeClassicLinkInstances
    :: DescribeClassicLinkInstances
describeClassicLinkInstances =
    DescribeClassicLinkInstances'
    { _dcliFilters = Nothing
    , _dcliNextToken = Nothing
    , _dcliInstanceIds = Nothing
    , _dcliDryRun = Nothing
    , _dcliMaxResults = Nothing
    }

-- | One or more filters.
--
-- -   'group-id' - The ID of a VPC security group that\'s associated with the instance.
--
-- -   'instance-id' - The ID of the instance.
--
-- -   'tag':/key/=/value/ - The key\/value combination of a tag assigned to the resource.
--
-- -   'tag-key' - The key of a tag assigned to the resource. This filter is independent of the 'tag-value' filter. For example, if you use both the filter \"tag-key=Purpose\" and the filter \"tag-value=X\", you get any resources assigned both the tag key Purpose (regardless of what the tag\'s value is), and the tag value X (regardless of what the tag\'s key is). If you want to list only resources where Purpose is X, see the 'tag':/key/=/value/ filter.
--
-- -   'tag-value' - The value of a tag assigned to the resource. This filter is independent of the 'tag-key' filter.
--
-- -   'vpc-id' - The ID of the VPC that the instance is linked to.
--
dcliFilters :: Lens' DescribeClassicLinkInstances [Filter]
dcliFilters = lens _dcliFilters (\ s a -> s{_dcliFilters = a}) . _Default . _Coerce;

-- | The token to retrieve the next page of results.
dcliNextToken :: Lens' DescribeClassicLinkInstances (Maybe Text)
dcliNextToken = lens _dcliNextToken (\ s a -> s{_dcliNextToken = a});

-- | One or more instance IDs. Must be instances linked to a VPC through ClassicLink.
dcliInstanceIds :: Lens' DescribeClassicLinkInstances [Text]
dcliInstanceIds = lens _dcliInstanceIds (\ s a -> s{_dcliInstanceIds = a}) . _Default . _Coerce;

-- | Checks whether you have the required permissions for the action, without actually making the request, and provides an error response. If you have the required permissions, the error response is 'DryRunOperation'. Otherwise, it is 'UnauthorizedOperation'.
dcliDryRun :: Lens' DescribeClassicLinkInstances (Maybe Bool)
dcliDryRun = lens _dcliDryRun (\ s a -> s{_dcliDryRun = a});

-- | The maximum number of results to return for the request in a single page. The remaining results of the initial request can be seen by sending another request with the returned 'NextToken' value. This value can be between 5 and 1000; if 'MaxResults' is given a value larger than 1000, only 1000 results are returned. You cannot specify this parameter and the instance IDs parameter in the same request.
--
-- Constraint: If the value is greater than 1000, we return only 1000 items.
dcliMaxResults :: Lens' DescribeClassicLinkInstances (Maybe Int)
dcliMaxResults = lens _dcliMaxResults (\ s a -> s{_dcliMaxResults = a});

instance AWSRequest DescribeClassicLinkInstances
         where
        type Rs DescribeClassicLinkInstances =
             DescribeClassicLinkInstancesResponse
        request = postQuery ec2
        response
          = receiveXML
              (\ s h x ->
                 DescribeClassicLinkInstancesResponse' <$>
                   (x .@? "nextToken") <*>
                     (x .@? "instancesSet" .!@ mempty >>=
                        may (parseXMLList "item"))
                     <*> (pure (fromEnum s)))

instance Hashable DescribeClassicLinkInstances

instance NFData DescribeClassicLinkInstances

instance ToHeaders DescribeClassicLinkInstances where
        toHeaders = const mempty

instance ToPath DescribeClassicLinkInstances where
        toPath = const "/"

instance ToQuery DescribeClassicLinkInstances where
        toQuery DescribeClassicLinkInstances'{..}
          = mconcat
              ["Action" =:
                 ("DescribeClassicLinkInstances" :: ByteString),
               "Version" =: ("2016-04-01" :: ByteString),
               toQuery (toQueryList "Filter" <$> _dcliFilters),
               "NextToken" =: _dcliNextToken,
               toQuery
                 (toQueryList "InstanceId" <$> _dcliInstanceIds),
               "DryRun" =: _dcliDryRun,
               "MaxResults" =: _dcliMaxResults]

-- | Contains the output of DescribeClassicLinkInstances.
--
-- /See:/ 'describeClassicLinkInstancesResponse' smart constructor.
data DescribeClassicLinkInstancesResponse = DescribeClassicLinkInstancesResponse'
    { _dclirsNextToken      :: !(Maybe Text)
    , _dclirsInstances      :: !(Maybe [ClassicLinkInstance])
    , _dclirsResponseStatus :: !Int
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeClassicLinkInstancesResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'dclirsNextToken'
--
-- * 'dclirsInstances'
--
-- * 'dclirsResponseStatus'
describeClassicLinkInstancesResponse
    :: Int -- ^ 'dclirsResponseStatus'
    -> DescribeClassicLinkInstancesResponse
describeClassicLinkInstancesResponse pResponseStatus_ =
    DescribeClassicLinkInstancesResponse'
    { _dclirsNextToken = Nothing
    , _dclirsInstances = Nothing
    , _dclirsResponseStatus = pResponseStatus_
    }

-- | The token to use to retrieve the next page of results. This value is 'null' when there are no more results to return.
dclirsNextToken :: Lens' DescribeClassicLinkInstancesResponse (Maybe Text)
dclirsNextToken = lens _dclirsNextToken (\ s a -> s{_dclirsNextToken = a});

-- | Information about one or more linked EC2-Classic instances.
dclirsInstances :: Lens' DescribeClassicLinkInstancesResponse [ClassicLinkInstance]
dclirsInstances = lens _dclirsInstances (\ s a -> s{_dclirsInstances = a}) . _Default . _Coerce;

-- | The response status code.
dclirsResponseStatus :: Lens' DescribeClassicLinkInstancesResponse Int
dclirsResponseStatus = lens _dclirsResponseStatus (\ s a -> s{_dclirsResponseStatus = a});

instance NFData DescribeClassicLinkInstancesResponse