{-# 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.DescribeRegions
-- Copyright   : (c) 2013-2016 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 one or more regions that are currently available to you.
--
-- For a list of the regions supported by Amazon EC2, see <http://docs.aws.amazon.com/general/latest/gr/rande.html#ec2_region Regions and Endpoints>.
module Network.AWS.EC2.DescribeRegions
    (
    -- * Creating a Request
      describeRegions
    , DescribeRegions
    -- * Request Lenses
    , drsRegionNames
    , drsFilters
    , drsDryRun

    -- * Destructuring the Response
    , describeRegionsResponse
    , DescribeRegionsResponse
    -- * Response Lenses
    , drrsRegions
    , drrsResponseStatus
    ) 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 DescribeRegions.
--
-- /See:/ 'describeRegions' smart constructor.
data DescribeRegions = DescribeRegions'
    { _drsRegionNames :: !(Maybe [Text])
    , _drsFilters     :: !(Maybe [Filter])
    , _drsDryRun      :: !(Maybe Bool)
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeRegions' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'drsRegionNames'
--
-- * 'drsFilters'
--
-- * 'drsDryRun'
describeRegions
    :: DescribeRegions
describeRegions =
    DescribeRegions'
    { _drsRegionNames = Nothing
    , _drsFilters = Nothing
    , _drsDryRun = Nothing
    }

-- | The names of one or more regions.
drsRegionNames :: Lens' DescribeRegions [Text]
drsRegionNames = lens _drsRegionNames (\ s a -> s{_drsRegionNames = a}) . _Default . _Coerce;

-- | One or more filters.
--
-- -   'endpoint' - The endpoint of the region (for example, 'ec2.us-east-1.amazonaws.com').
--
-- -   'region-name' - The name of the region (for example, 'us-east-1').
--
drsFilters :: Lens' DescribeRegions [Filter]
drsFilters = lens _drsFilters (\ s a -> s{_drsFilters = 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'.
drsDryRun :: Lens' DescribeRegions (Maybe Bool)
drsDryRun = lens _drsDryRun (\ s a -> s{_drsDryRun = a});

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

instance Hashable DescribeRegions

instance NFData DescribeRegions

instance ToHeaders DescribeRegions where
        toHeaders = const mempty

instance ToPath DescribeRegions where
        toPath = const "/"

instance ToQuery DescribeRegions where
        toQuery DescribeRegions'{..}
          = mconcat
              ["Action" =: ("DescribeRegions" :: ByteString),
               "Version" =: ("2016-04-01" :: ByteString),
               toQuery
                 (toQueryList "RegionName" <$> _drsRegionNames),
               toQuery (toQueryList "Filter" <$> _drsFilters),
               "DryRun" =: _drsDryRun]

-- | Contains the output of DescribeRegions.
--
-- /See:/ 'describeRegionsResponse' smart constructor.
data DescribeRegionsResponse = DescribeRegionsResponse'
    { _drrsRegions        :: !(Maybe [RegionInfo])
    , _drrsResponseStatus :: !Int
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeRegionsResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'drrsRegions'
--
-- * 'drrsResponseStatus'
describeRegionsResponse
    :: Int -- ^ 'drrsResponseStatus'
    -> DescribeRegionsResponse
describeRegionsResponse pResponseStatus_ =
    DescribeRegionsResponse'
    { _drrsRegions = Nothing
    , _drrsResponseStatus = pResponseStatus_
    }

-- | Information about one or more regions.
drrsRegions :: Lens' DescribeRegionsResponse [RegionInfo]
drrsRegions = lens _drrsRegions (\ s a -> s{_drrsRegions = a}) . _Default . _Coerce;

-- | The response status code.
drrsResponseStatus :: Lens' DescribeRegionsResponse Int
drrsResponseStatus = lens _drrsResponseStatus (\ s a -> s{_drrsResponseStatus = a});

instance NFData DescribeRegionsResponse