{-# 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.IAM.ListPolicyVersions
-- 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)
--
-- Lists information about the versions of the specified managed policy, including the version that is currently set as the policy\'s default version.
--
-- For more information about managed policies, see <http://docs.aws.amazon.com/IAM/latest/UserGuide/policies-managed-vs-inline.html Managed Policies and Inline Policies> in the /IAM User Guide/.
--
-- This operation returns paginated results.
module Network.AWS.IAM.ListPolicyVersions
    (
    -- * Creating a Request
      listPolicyVersions
    , ListPolicyVersions
    -- * Request Lenses
    , lpvMarker
    , lpvMaxItems
    , lpvPolicyARN

    -- * Destructuring the Response
    , listPolicyVersionsResponse
    , ListPolicyVersionsResponse
    -- * Response Lenses
    , lpvrsVersions
    , lpvrsMarker
    , lpvrsIsTruncated
    , lpvrsResponseStatus
    ) where

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

-- | /See:/ 'listPolicyVersions' smart constructor.
data ListPolicyVersions = ListPolicyVersions'
    { _lpvMarker    :: !(Maybe Text)
    , _lpvMaxItems  :: !(Maybe Nat)
    , _lpvPolicyARN :: !Text
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'ListPolicyVersions' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'lpvMarker'
--
-- * 'lpvMaxItems'
--
-- * 'lpvPolicyARN'
listPolicyVersions
    :: Text -- ^ 'lpvPolicyARN'
    -> ListPolicyVersions
listPolicyVersions pPolicyARN_ =
    ListPolicyVersions'
    { _lpvMarker = Nothing
    , _lpvMaxItems = Nothing
    , _lpvPolicyARN = pPolicyARN_
    }

-- | Use this parameter only when paginating results and only after you receive a response indicating that the results are truncated. Set it to the value of the 'Marker' element in the response that you received to indicate where the next call should start.
lpvMarker :: Lens' ListPolicyVersions (Maybe Text)
lpvMarker = lens _lpvMarker (\ s a -> s{_lpvMarker = a});

-- | Use this only when paginating results to indicate the maximum number of items you want in the response. If additional items exist beyond the maximum you specify, the 'IsTruncated' response element is 'true'.
--
-- This parameter is optional. If you do not include it, it defaults to 100. Note that IAM might return fewer results, even when there are more results available. In that case, the 'IsTruncated' response element returns 'true' and 'Marker' contains a value to include in the subsequent call that tells the service where to continue from.
lpvMaxItems :: Lens' ListPolicyVersions (Maybe Natural)
lpvMaxItems = lens _lpvMaxItems (\ s a -> s{_lpvMaxItems = a}) . mapping _Nat;

-- | The Amazon Resource Name (ARN) of the IAM policy for which you want the versions.
--
-- For more information about ARNs, see <http://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html Amazon Resource Names (ARNs) and AWS Service Namespaces> in the /AWS General Reference/.
lpvPolicyARN :: Lens' ListPolicyVersions Text
lpvPolicyARN = lens _lpvPolicyARN (\ s a -> s{_lpvPolicyARN = a});

instance AWSPager ListPolicyVersions where
        page rq rs
          | stop (rs ^. lpvrsIsTruncated) = Nothing
          | isNothing (rs ^. lpvrsMarker) = Nothing
          | otherwise =
            Just $ rq & lpvMarker .~ rs ^. lpvrsMarker

instance AWSRequest ListPolicyVersions where
        type Rs ListPolicyVersions =
             ListPolicyVersionsResponse
        request = postQuery iam
        response
          = receiveXMLWrapper "ListPolicyVersionsResult"
              (\ s h x ->
                 ListPolicyVersionsResponse' <$>
                   (x .@? "Versions" .!@ mempty >>=
                      may (parseXMLList "member"))
                     <*> (x .@? "Marker")
                     <*> (x .@? "IsTruncated")
                     <*> (pure (fromEnum s)))

instance Hashable ListPolicyVersions

instance NFData ListPolicyVersions

instance ToHeaders ListPolicyVersions where
        toHeaders = const mempty

instance ToPath ListPolicyVersions where
        toPath = const "/"

instance ToQuery ListPolicyVersions where
        toQuery ListPolicyVersions'{..}
          = mconcat
              ["Action" =: ("ListPolicyVersions" :: ByteString),
               "Version" =: ("2010-05-08" :: ByteString),
               "Marker" =: _lpvMarker, "MaxItems" =: _lpvMaxItems,
               "PolicyArn" =: _lpvPolicyARN]

-- | Contains the response to a successful < ListPolicyVersions> request.
--
-- /See:/ 'listPolicyVersionsResponse' smart constructor.
data ListPolicyVersionsResponse = ListPolicyVersionsResponse'
    { _lpvrsVersions       :: !(Maybe [PolicyVersion])
    , _lpvrsMarker         :: !(Maybe Text)
    , _lpvrsIsTruncated    :: !(Maybe Bool)
    , _lpvrsResponseStatus :: !Int
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'ListPolicyVersionsResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'lpvrsVersions'
--
-- * 'lpvrsMarker'
--
-- * 'lpvrsIsTruncated'
--
-- * 'lpvrsResponseStatus'
listPolicyVersionsResponse
    :: Int -- ^ 'lpvrsResponseStatus'
    -> ListPolicyVersionsResponse
listPolicyVersionsResponse pResponseStatus_ =
    ListPolicyVersionsResponse'
    { _lpvrsVersions = Nothing
    , _lpvrsMarker = Nothing
    , _lpvrsIsTruncated = Nothing
    , _lpvrsResponseStatus = pResponseStatus_
    }

-- | A list of policy versions.
--
-- For more information about managed policy versions, see <http://docs.aws.amazon.com/IAM/latest/UserGuide/policies-managed-versions.html Versioning for Managed Policies> in the /IAM User Guide/.
lpvrsVersions :: Lens' ListPolicyVersionsResponse [PolicyVersion]
lpvrsVersions = lens _lpvrsVersions (\ s a -> s{_lpvrsVersions = a}) . _Default . _Coerce;

-- | When 'IsTruncated' is 'true', this element is present and contains the value to use for the 'Marker' parameter in a subsequent pagination request.
lpvrsMarker :: Lens' ListPolicyVersionsResponse (Maybe Text)
lpvrsMarker = lens _lpvrsMarker (\ s a -> s{_lpvrsMarker = a});

-- | A flag that indicates whether there are more items to return. If your results were truncated, you can make a subsequent pagination request using the 'Marker' request parameter to retrieve more items. Note that IAM might return fewer than the 'MaxItems' number of results even when there are more results available. We recommend that you check 'IsTruncated' after every call to ensure that you receive all of your results.
lpvrsIsTruncated :: Lens' ListPolicyVersionsResponse (Maybe Bool)
lpvrsIsTruncated = lens _lpvrsIsTruncated (\ s a -> s{_lpvrsIsTruncated = a});

-- | The response status code.
lpvrsResponseStatus :: Lens' ListPolicyVersionsResponse Int
lpvrsResponseStatus = lens _lpvrsResponseStatus (\ s a -> s{_lpvrsResponseStatus = a});

instance NFData ListPolicyVersionsResponse