{-# 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.OpsWorks.DescribeAgentVersions
-- 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)
--
-- Describes the available AWS OpsWorks agent versions. You must specify a
-- stack ID or a configuration manager. 'DescribeAgentVersions' returns a
-- list of available agent versions for the specified stack or
-- configuration manager.
--
-- /See:/ <http://docs.aws.amazon.com/opsworks/latest/APIReference/API_DescribeAgentVersions.html AWS API Reference> for DescribeAgentVersions.
module Network.AWS.OpsWorks.DescribeAgentVersions
    (
    -- * Creating a Request
      describeAgentVersions
    , DescribeAgentVersions
    -- * Request Lenses
    , davConfigurationManager
    , davStackId

    -- * Destructuring the Response
    , describeAgentVersionsResponse
    , DescribeAgentVersionsResponse
    -- * Response Lenses
    , davrsAgentVersions
    , davrsStatus
    ) where

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

-- | /See:/ 'describeAgentVersions' smart constructor.
data DescribeAgentVersions = DescribeAgentVersions'
    { _davConfigurationManager :: !(Maybe StackConfigurationManager)
    , _davStackId              :: !(Maybe Text)
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeAgentVersions' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'davConfigurationManager'
--
-- * 'davStackId'
describeAgentVersions
    :: DescribeAgentVersions
describeAgentVersions =
    DescribeAgentVersions'
    { _davConfigurationManager = Nothing
    , _davStackId = Nothing
    }

-- | The configuration manager.
davConfigurationManager :: Lens' DescribeAgentVersions (Maybe StackConfigurationManager)
davConfigurationManager = lens _davConfigurationManager (\ s a -> s{_davConfigurationManager = a});

-- | The stack ID.
davStackId :: Lens' DescribeAgentVersions (Maybe Text)
davStackId = lens _davStackId (\ s a -> s{_davStackId = a});

instance AWSRequest DescribeAgentVersions where
        type Rs DescribeAgentVersions =
             DescribeAgentVersionsResponse
        request = postJSON opsWorks
        response
          = receiveJSON
              (\ s h x ->
                 DescribeAgentVersionsResponse' <$>
                   (x .?> "AgentVersions" .!@ mempty) <*>
                     (pure (fromEnum s)))

instance ToHeaders DescribeAgentVersions where
        toHeaders
          = const
              (mconcat
                 ["X-Amz-Target" =#
                    ("OpsWorks_20130218.DescribeAgentVersions" ::
                       ByteString),
                  "Content-Type" =#
                    ("application/x-amz-json-1.1" :: ByteString)])

instance ToJSON DescribeAgentVersions where
        toJSON DescribeAgentVersions'{..}
          = object
              (catMaybes
                 [("ConfigurationManager" .=) <$>
                    _davConfigurationManager,
                  ("StackId" .=) <$> _davStackId])

instance ToPath DescribeAgentVersions where
        toPath = const "/"

instance ToQuery DescribeAgentVersions where
        toQuery = const mempty

-- | Contains the response to a 'DescribeAgentVersions' request.
--
-- /See:/ 'describeAgentVersionsResponse' smart constructor.
data DescribeAgentVersionsResponse = DescribeAgentVersionsResponse'
    { _davrsAgentVersions :: !(Maybe [AgentVersion])
    , _davrsStatus        :: !Int
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeAgentVersionsResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'davrsAgentVersions'
--
-- * 'davrsStatus'
describeAgentVersionsResponse
    :: Int -- ^ 'davrsStatus'
    -> DescribeAgentVersionsResponse
describeAgentVersionsResponse pStatus_ =
    DescribeAgentVersionsResponse'
    { _davrsAgentVersions = Nothing
    , _davrsStatus = pStatus_
    }

-- | The agent versions for the specified stack or configuration manager.
-- Note that this value is the complete version number, not the abbreviated
-- number used by the console.
davrsAgentVersions :: Lens' DescribeAgentVersionsResponse [AgentVersion]
davrsAgentVersions = lens _davrsAgentVersions (\ s a -> s{_davrsAgentVersions = a}) . _Default . _Coerce;

-- | The response status code.
davrsStatus :: Lens' DescribeAgentVersionsResponse Int
davrsStatus = lens _davrsStatus (\ s a -> s{_davrsStatus = a});