{-# 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.EFS.DescribeTags
-- 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)
--
-- Returns the tags associated with a file system. The order of tags
-- returned in the response of one 'DescribeTags' call, and the order of
-- tags returned across the responses of a multi-call iteration (when using
-- pagination), is unspecified.
--
-- This operation requires permission for the
-- 'elasticfilesystem:DescribeTags' action.
--
-- /See:/ <http://docs.aws.amazon.com/directoryservice/latest/devguide/API_DescribeTags.html AWS API Reference> for DescribeTags.
module Network.AWS.EFS.DescribeTags
    (
    -- * Creating a Request
      describeTags
    , DescribeTags
    -- * Request Lenses
    , dtMarker
    , dtMaxItems
    , dtFileSystemId

    -- * Destructuring the Response
    , describeTagsResponse
    , DescribeTagsResponse
    -- * Response Lenses
    , dtrsMarker
    , dtrsNextMarker
    , dtrsResponseStatus
    , dtrsTags
    ) where

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

-- | /See:/ 'describeTags' smart constructor.
data DescribeTags = DescribeTags'
    { _dtMarker       :: !(Maybe Text)
    , _dtMaxItems     :: !(Maybe Nat)
    , _dtFileSystemId :: !Text
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeTags' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'dtMarker'
--
-- * 'dtMaxItems'
--
-- * 'dtFileSystemId'
describeTags
    :: Text -- ^ 'dtFileSystemId'
    -> DescribeTags
describeTags pFileSystemId_ =
    DescribeTags'
    { _dtMarker = Nothing
    , _dtMaxItems = Nothing
    , _dtFileSystemId = pFileSystemId_
    }

-- | Optional. String. Opaque pagination token returned from a previous
-- 'DescribeTags' operation. If present, it specifies to continue the list
-- from where the previous call left off.
dtMarker :: Lens' DescribeTags (Maybe Text)
dtMarker = lens _dtMarker (\ s a -> s{_dtMarker = a});

-- | Optional. Maximum number of file system tags to return in the response.
-- It must be an integer with a value greater than zero.
dtMaxItems :: Lens' DescribeTags (Maybe Natural)
dtMaxItems = lens _dtMaxItems (\ s a -> s{_dtMaxItems = a}) . mapping _Nat;

-- | The ID of the file system whose tag set you want to retrieve.
dtFileSystemId :: Lens' DescribeTags Text
dtFileSystemId = lens _dtFileSystemId (\ s a -> s{_dtFileSystemId = a});

instance AWSRequest DescribeTags where
        type Rs DescribeTags = DescribeTagsResponse
        request = get eFS
        response
          = receiveJSON
              (\ s h x ->
                 DescribeTagsResponse' <$>
                   (x .?> "Marker") <*> (x .?> "NextMarker") <*>
                     (pure (fromEnum s))
                     <*> (x .?> "Tags" .!@ mempty))

instance ToHeaders DescribeTags where
        toHeaders = const mempty

instance ToPath DescribeTags where
        toPath DescribeTags'{..}
          = mconcat
              ["/2015-02-01/tags/", toBS _dtFileSystemId, "/"]

instance ToQuery DescribeTags where
        toQuery DescribeTags'{..}
          = mconcat
              ["Marker" =: _dtMarker, "MaxItems" =: _dtMaxItems]

-- | /See:/ 'describeTagsResponse' smart constructor.
data DescribeTagsResponse = DescribeTagsResponse'
    { _dtrsMarker         :: !(Maybe Text)
    , _dtrsNextMarker     :: !(Maybe Text)
    , _dtrsResponseStatus :: !Int
    , _dtrsTags           :: ![Tag]
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeTagsResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'dtrsMarker'
--
-- * 'dtrsNextMarker'
--
-- * 'dtrsResponseStatus'
--
-- * 'dtrsTags'
describeTagsResponse
    :: Int -- ^ 'dtrsResponseStatus'
    -> DescribeTagsResponse
describeTagsResponse pResponseStatus_ =
    DescribeTagsResponse'
    { _dtrsMarker = Nothing
    , _dtrsNextMarker = Nothing
    , _dtrsResponseStatus = pResponseStatus_
    , _dtrsTags = mempty
    }

-- | If the request included a 'Marker', the response returns that value in
-- this field.
dtrsMarker :: Lens' DescribeTagsResponse (Maybe Text)
dtrsMarker = lens _dtrsMarker (\ s a -> s{_dtrsMarker = a});

-- | If a value is present, there are more tags to return. In a subsequent
-- request, you can provide the value of 'NextMarker' as the value of the
-- 'Marker' parameter in your next request to retrieve the next set of
-- tags.
dtrsNextMarker :: Lens' DescribeTagsResponse (Maybe Text)
dtrsNextMarker = lens _dtrsNextMarker (\ s a -> s{_dtrsNextMarker = a});

-- | The response status code.
dtrsResponseStatus :: Lens' DescribeTagsResponse Int
dtrsResponseStatus = lens _dtrsResponseStatus (\ s a -> s{_dtrsResponseStatus = a});

-- | Returns tags associated with the file system as an array of 'Tag'
-- objects.
dtrsTags :: Lens' DescribeTagsResponse [Tag]
dtrsTags = lens _dtrsTags (\ s a -> s{_dtrsTags = a}) . _Coerce;