{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric      #-}
{-# LANGUAGE OverloadedStrings  #-}
{-# LANGUAGE RecordWildCards    #-}

-- |
-- Module      : Network.AWS.EC2.Internal
-- Copyright   : (c) 2013-2016 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay <brendan.g.hay@gmail.com>
-- Stability   : experimental
-- Portability : non-portable (GHC extensions)
--
module Network.AWS.EC2.Internal where

import           Network.AWS.Lens
import           Network.AWS.Prelude

-- | Custom 'Tag' type which has an optional value component.
--
-- /See:/ 'tag' smart constructor.
data DeleteTag = DeleteTag
    { _deleteTagKey   :: !Text
    , _deleteTagValue :: !(Maybe Text)
    } deriving (Eq, Read, Show, Data, Typeable, Generic)

deleteTag :: Text -- ^ 'deleteTagKey'
          -> DeleteTag
deleteTag k = DeleteTag k Nothing

-- | The key of the tag to delete.
--
-- Constraints: Tag keys are case-sensitive and accept a maximum of 127
-- Unicode characters. May not begin with 'aws:'
deleteTagKey :: Lens' DeleteTag Text
deleteTagKey = lens _deleteTagKey (\s a -> s { _deleteTagKey = a })

-- | The optional value of the tag to delete.
--
-- Constraints: Tag values are case-sensitive and accept a maximum of 255
-- Unicode characters.
deleteTagValue :: Lens' DeleteTag (Maybe Text)
deleteTagValue = lens _deleteTagValue (\ s a -> s{_deleteTagValue = a});

instance FromXML DeleteTag where
    parseXML x = DeleteTag <$> (x .@ "key") <*> (x .@? "value")

instance ToQuery DeleteTag where
    toQuery DeleteTag {..} = mconcat
        [ "Key"   =: _deleteTagKey
        , "Value" =: _deleteTagValue
        ]