{-# 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.DescribeStacks
-- 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)
--
-- Requests a description of one or more stacks.
--
-- __Required Permissions__: To use this action, an IAM user must have a
-- Show, Deploy, or Manage permissions level for the stack, or an attached
-- policy that explicitly grants permissions. For more information on user
-- permissions, see
-- <http://docs.aws.amazon.com/opsworks/latest/userguide/opsworks-security-users.html Managing User Permissions>.
--
-- /See:/ <http://docs.aws.amazon.com/opsworks/latest/APIReference/API_DescribeStacks.html AWS API Reference> for DescribeStacks.
module Network.AWS.OpsWorks.DescribeStacks
    (
    -- * Creating a Request
      describeStacks
    , DescribeStacks
    -- * Request Lenses
    , dsStackIds

    -- * Destructuring the Response
    , describeStacksResponse
    , DescribeStacksResponse
    -- * Response Lenses
    , dsrsStacks
    , dsrsStatus
    ) 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:/ 'describeStacks' smart constructor.
newtype DescribeStacks = DescribeStacks'
    { _dsStackIds :: Maybe [Text]
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeStacks' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'dsStackIds'
describeStacks
    :: DescribeStacks
describeStacks =
    DescribeStacks'
    { _dsStackIds = Nothing
    }

-- | An array of stack IDs that specify the stacks to be described. If you
-- omit this parameter, 'DescribeStacks' returns a description of every
-- stack.
dsStackIds :: Lens' DescribeStacks [Text]
dsStackIds = lens _dsStackIds (\ s a -> s{_dsStackIds = a}) . _Default . _Coerce;

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

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

instance ToJSON DescribeStacks where
        toJSON DescribeStacks'{..}
          = object
              (catMaybes [("StackIds" .=) <$> _dsStackIds])

instance ToPath DescribeStacks where
        toPath = const "/"

instance ToQuery DescribeStacks where
        toQuery = const mempty

-- | Contains the response to a 'DescribeStacks' request.
--
-- /See:/ 'describeStacksResponse' smart constructor.
data DescribeStacksResponse = DescribeStacksResponse'
    { _dsrsStacks :: !(Maybe [Stack])
    , _dsrsStatus :: !Int
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeStacksResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'dsrsStacks'
--
-- * 'dsrsStatus'
describeStacksResponse
    :: Int -- ^ 'dsrsStatus'
    -> DescribeStacksResponse
describeStacksResponse pStatus_ =
    DescribeStacksResponse'
    { _dsrsStacks = Nothing
    , _dsrsStatus = pStatus_
    }

-- | An array of 'Stack' objects that describe the stacks.
dsrsStacks :: Lens' DescribeStacksResponse [Stack]
dsrsStacks = lens _dsrsStacks (\ s a -> s{_dsrsStacks = a}) . _Default . _Coerce;

-- | The response status code.
dsrsStatus :: Lens' DescribeStacksResponse Int
dsrsStatus = lens _dsrsStatus (\ s a -> s{_dsrsStatus = a});