{-# 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.CloudFormation.ListStacks
-- 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 the summary information for stacks whose status matches the
-- specified StackStatusFilter. Summary information for stacks that have
-- been deleted is kept for 90 days after the stack is deleted. If no
-- StackStatusFilter is specified, summary information for all stacks is
-- returned (including existing stacks and stacks that have been deleted).
--
-- This operation returns paginated results.
module Network.AWS.CloudFormation.ListStacks
    (
    -- * Creating a Request
      listStacks
    , ListStacks
    -- * Request Lenses
    , lsNextToken
    , lsStackStatusFilter

    -- * Destructuring the Response
    , listStacksResponse
    , ListStacksResponse
    -- * Response Lenses
    , lsrsNextToken
    , lsrsStackSummaries
    , lsrsResponseStatus
    ) where

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

-- | The input for < ListStacks> action.
--
-- /See:/ 'listStacks' smart constructor.
data ListStacks = ListStacks'
    { _lsNextToken         :: !(Maybe Text)
    , _lsStackStatusFilter :: !(Maybe [StackStatus])
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'ListStacks' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'lsNextToken'
--
-- * 'lsStackStatusFilter'
listStacks
    :: ListStacks
listStacks =
    ListStacks'
    { _lsNextToken = Nothing
    , _lsStackStatusFilter = Nothing
    }

-- | A string that identifies the next page of stacks that you want to
-- retrieve.
lsNextToken :: Lens' ListStacks (Maybe Text)
lsNextToken = lens _lsNextToken (\ s a -> s{_lsNextToken = a});

-- | Stack status to use as a filter. Specify one or more stack status codes
-- to list only stacks with the specified status codes. For a complete list
-- of stack status codes, see the 'StackStatus' parameter of the < Stack>
-- data type.
lsStackStatusFilter :: Lens' ListStacks [StackStatus]
lsStackStatusFilter = lens _lsStackStatusFilter (\ s a -> s{_lsStackStatusFilter = a}) . _Default . _Coerce;

instance AWSPager ListStacks where
        page rq rs
          | stop (rs ^. lsrsNextToken) = Nothing
          | stop (rs ^. lsrsStackSummaries) = Nothing
          | otherwise =
            Just $ rq & lsNextToken .~ rs ^. lsrsNextToken

instance AWSRequest ListStacks where
        type Rs ListStacks = ListStacksResponse
        request = postQuery cloudFormation
        response
          = receiveXMLWrapper "ListStacksResult"
              (\ s h x ->
                 ListStacksResponse' <$>
                   (x .@? "NextToken") <*>
                     (x .@? "StackSummaries" .!@ mempty >>=
                        may (parseXMLList "member"))
                     <*> (pure (fromEnum s)))

instance Hashable ListStacks

instance ToHeaders ListStacks where
        toHeaders = const mempty

instance ToPath ListStacks where
        toPath = const "/"

instance ToQuery ListStacks where
        toQuery ListStacks'{..}
          = mconcat
              ["Action" =: ("ListStacks" :: ByteString),
               "Version" =: ("2010-05-15" :: ByteString),
               "NextToken" =: _lsNextToken,
               "StackStatusFilter" =:
                 toQuery
                   (toQueryList "member" <$> _lsStackStatusFilter)]

-- | The output for < ListStacks> action.
--
-- /See:/ 'listStacksResponse' smart constructor.
data ListStacksResponse = ListStacksResponse'
    { _lsrsNextToken      :: !(Maybe Text)
    , _lsrsStackSummaries :: !(Maybe [StackSummary])
    , _lsrsResponseStatus :: !Int
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'ListStacksResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'lsrsNextToken'
--
-- * 'lsrsStackSummaries'
--
-- * 'lsrsResponseStatus'
listStacksResponse
    :: Int -- ^ 'lsrsResponseStatus'
    -> ListStacksResponse
listStacksResponse pResponseStatus_ =
    ListStacksResponse'
    { _lsrsNextToken = Nothing
    , _lsrsStackSummaries = Nothing
    , _lsrsResponseStatus = pResponseStatus_
    }

-- | If the output exceeds 1 MB in size, a string that identifies the next
-- page of stacks. If no additional page exists, this value is null.
lsrsNextToken :: Lens' ListStacksResponse (Maybe Text)
lsrsNextToken = lens _lsrsNextToken (\ s a -> s{_lsrsNextToken = a});

-- | A list of 'StackSummary' structures containing information about the
-- specified stacks.
lsrsStackSummaries :: Lens' ListStacksResponse [StackSummary]
lsrsStackSummaries = lens _lsrsStackSummaries (\ s a -> s{_lsrsStackSummaries = a}) . _Default . _Coerce;

-- | The response status code.
lsrsResponseStatus :: Lens' ListStacksResponse Int
lsrsResponseStatus = lens _lsrsResponseStatus (\ s a -> s{_lsrsResponseStatus = a});