{-# 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.EC2.DescribeAvailabilityZones
-- Copyright   : (c) 2013-2018 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay <brendan.g.hay+amazonka@gmail.com>
-- Stability   : auto-generated
-- Portability : non-portable (GHC extensions)
--
-- Describes one or more of the Availability Zones that are available to you. The results include zones only for the region you're currently using. If there is an event impacting an Availability Zone, you can use this request to view the state and any provided message for that Availability Zone.
--
--
-- For more information, see <http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html Regions and Availability Zones> in the /Amazon Elastic Compute Cloud User Guide/ .
--
module Network.AWS.EC2.DescribeAvailabilityZones
    (
    -- * Creating a Request
      describeAvailabilityZones
    , DescribeAvailabilityZones
    -- * Request Lenses
    , dazZoneNames
    , dazFilters
    , dazDryRun

    -- * Destructuring the Response
    , describeAvailabilityZonesResponse
    , DescribeAvailabilityZonesResponse
    -- * Response Lenses
    , dazrsAvailabilityZones
    , dazrsResponseStatus
    ) where

import Network.AWS.EC2.Types
import Network.AWS.EC2.Types.Product
import Network.AWS.Lens
import Network.AWS.Prelude
import Network.AWS.Request
import Network.AWS.Response

-- | Contains the parameters for DescribeAvailabilityZones.
--
--
--
-- /See:/ 'describeAvailabilityZones' smart constructor.
data DescribeAvailabilityZones = DescribeAvailabilityZones'
  { _dazZoneNames :: !(Maybe [Text])
  , _dazFilters   :: !(Maybe [Filter])
  , _dazDryRun    :: !(Maybe Bool)
  } deriving (Eq, Read, Show, Data, Typeable, Generic)


-- | Creates a value of 'DescribeAvailabilityZones' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'dazZoneNames' - The names of one or more Availability Zones.
--
-- * 'dazFilters' - One or more filters.     * @message@ - Information about the Availability Zone.     * @region-name@ - The name of the region for the Availability Zone (for example, @us-east-1@ ).     * @state@ - The state of the Availability Zone (@available@ | @information@ | @impaired@ | @unavailable@ ).     * @zone-name@ - The name of the Availability Zone (for example, @us-east-1a@ ).
--
-- * 'dazDryRun' - Checks whether you have the required permissions for the action, without actually making the request, and provides an error response. If you have the required permissions, the error response is @DryRunOperation@ . Otherwise, it is @UnauthorizedOperation@ .
describeAvailabilityZones
    :: DescribeAvailabilityZones
describeAvailabilityZones =
  DescribeAvailabilityZones'
    {_dazZoneNames = Nothing, _dazFilters = Nothing, _dazDryRun = Nothing}


-- | The names of one or more Availability Zones.
dazZoneNames :: Lens' DescribeAvailabilityZones [Text]
dazZoneNames = lens _dazZoneNames (\ s a -> s{_dazZoneNames = a}) . _Default . _Coerce

-- | One or more filters.     * @message@ - Information about the Availability Zone.     * @region-name@ - The name of the region for the Availability Zone (for example, @us-east-1@ ).     * @state@ - The state of the Availability Zone (@available@ | @information@ | @impaired@ | @unavailable@ ).     * @zone-name@ - The name of the Availability Zone (for example, @us-east-1a@ ).
dazFilters :: Lens' DescribeAvailabilityZones [Filter]
dazFilters = lens _dazFilters (\ s a -> s{_dazFilters = a}) . _Default . _Coerce

-- | Checks whether you have the required permissions for the action, without actually making the request, and provides an error response. If you have the required permissions, the error response is @DryRunOperation@ . Otherwise, it is @UnauthorizedOperation@ .
dazDryRun :: Lens' DescribeAvailabilityZones (Maybe Bool)
dazDryRun = lens _dazDryRun (\ s a -> s{_dazDryRun = a})

instance AWSRequest DescribeAvailabilityZones where
        type Rs DescribeAvailabilityZones =
             DescribeAvailabilityZonesResponse
        request = postQuery ec2
        response
          = receiveXML
              (\ s h x ->
                 DescribeAvailabilityZonesResponse' <$>
                   (x .@? "availabilityZoneInfo" .!@ mempty >>=
                      may (parseXMLList "item"))
                     <*> (pure (fromEnum s)))

instance Hashable DescribeAvailabilityZones where

instance NFData DescribeAvailabilityZones where

instance ToHeaders DescribeAvailabilityZones where
        toHeaders = const mempty

instance ToPath DescribeAvailabilityZones where
        toPath = const "/"

instance ToQuery DescribeAvailabilityZones where
        toQuery DescribeAvailabilityZones'{..}
          = mconcat
              ["Action" =:
                 ("DescribeAvailabilityZones" :: ByteString),
               "Version" =: ("2016-11-15" :: ByteString),
               toQuery (toQueryList "ZoneName" <$> _dazZoneNames),
               toQuery (toQueryList "Filter" <$> _dazFilters),
               "DryRun" =: _dazDryRun]

-- | Contains the output of DescribeAvailabiltyZones.
--
--
--
-- /See:/ 'describeAvailabilityZonesResponse' smart constructor.
data DescribeAvailabilityZonesResponse = DescribeAvailabilityZonesResponse'
  { _dazrsAvailabilityZones :: !(Maybe [AvailabilityZone])
  , _dazrsResponseStatus    :: !Int
  } deriving (Eq, Read, Show, Data, Typeable, Generic)


-- | Creates a value of 'DescribeAvailabilityZonesResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'dazrsAvailabilityZones' - Information about one or more Availability Zones.
--
-- * 'dazrsResponseStatus' - -- | The response status code.
describeAvailabilityZonesResponse
    :: Int -- ^ 'dazrsResponseStatus'
    -> DescribeAvailabilityZonesResponse
describeAvailabilityZonesResponse pResponseStatus_ =
  DescribeAvailabilityZonesResponse'
    {_dazrsAvailabilityZones = Nothing, _dazrsResponseStatus = pResponseStatus_}


-- | Information about one or more Availability Zones.
dazrsAvailabilityZones :: Lens' DescribeAvailabilityZonesResponse [AvailabilityZone]
dazrsAvailabilityZones = lens _dazrsAvailabilityZones (\ s a -> s{_dazrsAvailabilityZones = a}) . _Default . _Coerce

-- | -- | The response status code.
dazrsResponseStatus :: Lens' DescribeAvailabilityZonesResponse Int
dazrsResponseStatus = lens _dazrsResponseStatus (\ s a -> s{_dazrsResponseStatus = a})

instance NFData DescribeAvailabilityZonesResponse
         where