{-# LANGUAGE DataKinds                   #-}
{-# LANGUAGE DeriveGeneric               #-}
{-# LANGUAGE FlexibleInstances           #-}
{-# LANGUAGE GeneralizedNewtypeDeriving  #-}
{-# LANGUAGE LambdaCase                  #-}
{-# LANGUAGE NoImplicitPrelude           #-}
{-# LANGUAGE OverloadedStrings           #-}
{-# LANGUAGE RecordWildCards             #-}
{-# LANGUAGE TypeFamilies                #-}

{-# OPTIONS_GHC -fno-warn-unused-imports #-}

-- Module      : Network.AWS.SNS.GetTopicAttributes
-- Copyright   : (c) 2013-2014 Brendan Hay <brendan.g.hay@gmail.com>
-- License     : This Source Code Form is subject to the terms of
--               the Mozilla Public License, v. 2.0.
--               A copy of the MPL can be found in the LICENSE file or
--               you can obtain it at http://mozilla.org/MPL/2.0/.
-- Maintainer  : Brendan Hay <brendan.g.hay@gmail.com>
-- Stability   : experimental
-- Portability : non-portable (GHC extensions)
--
-- Derived from AWS service descriptions, licensed under Apache 2.0.

-- | Returns all of the properties of a topic. Topic properties returned might
-- differ based on the authorization of the user.
--
-- <http://docs.aws.amazon.com/sns/latest/api/API_GetTopicAttributes.html>
module Network.AWS.SNS.GetTopicAttributes
    (
    -- * Request
      GetTopicAttributes
    -- ** Request constructor
    , getTopicAttributes
    -- ** Request lenses
    , gtaTopicArn

    -- * Response
    , GetTopicAttributesResponse
    -- ** Response constructor
    , getTopicAttributesResponse
    -- ** Response lenses
    , gtarAttributes
    ) where

import Network.AWS.Prelude
import Network.AWS.Request.Query
import Network.AWS.SNS.Types
import qualified GHC.Exts

newtype GetTopicAttributes = GetTopicAttributes
    { _gtaTopicArn :: Text
    } deriving (Eq, Ord, Show, Monoid, IsString)

-- | 'GetTopicAttributes' constructor.
--
-- The fields accessible through corresponding lenses are:
--
-- * 'gtaTopicArn' @::@ 'Text'
--
getTopicAttributes :: Text -- ^ 'gtaTopicArn'
                   -> GetTopicAttributes
getTopicAttributes p1 = GetTopicAttributes
    { _gtaTopicArn = p1
    }

-- | The ARN of the topic whose properties you want to get.
gtaTopicArn :: Lens' GetTopicAttributes Text
gtaTopicArn = lens _gtaTopicArn (\s a -> s { _gtaTopicArn = a })

newtype GetTopicAttributesResponse = GetTopicAttributesResponse
    { _gtarAttributes :: EMap "entry" "key" "value" Text Text
    } deriving (Eq, Show, Monoid, Semigroup)

-- | 'GetTopicAttributesResponse' constructor.
--
-- The fields accessible through corresponding lenses are:
--
-- * 'gtarAttributes' @::@ 'HashMap' 'Text' 'Text'
--
getTopicAttributesResponse :: GetTopicAttributesResponse
getTopicAttributesResponse = GetTopicAttributesResponse
    { _gtarAttributes = mempty
    }

-- | A map of the topic's attributes. Attributes in this map include the following:
--
-- 'TopicArn' -- the topic's ARN  'Owner' -- the AWS account ID of the topic's
-- owner  'Policy' -- the JSON serialization of the topic's access control policy  'DisplayName' -- the human-readable name used in the "From" field for
-- notifications to email and email-json endpoints  'SubscriptionsPending' -- the
-- number of subscriptions pending confirmation on this topic  'SubscriptionsConfirmed' -- the number of confirmed subscriptions on this topic  'SubscriptionsDeleted'
-- -- the number of deleted subscriptions on this topic  'DeliveryPolicy' -- the
-- JSON serialization of the topic's delivery policy  'EffectiveDeliveryPolicy' --
-- the JSON serialization of the effective delivery policy that takes into
-- account system defaults
gtarAttributes :: Lens' GetTopicAttributesResponse (HashMap Text Text)
gtarAttributes = lens _gtarAttributes (\s a -> s { _gtarAttributes = a }) . _EMap

instance ToPath GetTopicAttributes where
    toPath = const "/"

instance ToQuery GetTopicAttributes where
    toQuery GetTopicAttributes{..} = mconcat
        [ "TopicArn" =? _gtaTopicArn
        ]

instance ToHeaders GetTopicAttributes

instance AWSRequest GetTopicAttributes where
    type Sv GetTopicAttributes = SNS
    type Rs GetTopicAttributes = GetTopicAttributesResponse

    request  = post "GetTopicAttributes"
    response = xmlResponse

instance FromXML GetTopicAttributesResponse where
    parseXML = withElement "GetTopicAttributesResult" $ \x -> GetTopicAttributesResponse
        <$> x .@? "Attributes" .!@ mempty