{-# LANGUAGE DataKinds                   #-}
{-# LANGUAGE DeriveGeneric               #-}
{-# LANGUAGE FlexibleInstances           #-}
{-# LANGUAGE GeneralizedNewtypeDeriving  #-}
{-# LANGUAGE LambdaCase                  #-}
{-# LANGUAGE NoImplicitPrelude           #-}
{-# LANGUAGE OverloadedStrings           #-}
{-# LANGUAGE RecordWildCards             #-}
{-# LANGUAGE TypeFamilies                #-}

{-# OPTIONS_GHC -fno-warn-unused-imports #-}

-- Module      : Network.AWS.CloudSearch.DescribeExpressions
-- Copyright   : (c) 2013-2014 Brendan Hay <brendan.g.hay@gmail.com>
-- License     : This Source Code Form is subject to the terms of
--               the Mozilla Public License, v. 2.0.
--               A copy of the MPL can be found in the LICENSE file or
--               you can obtain it at http://mozilla.org/MPL/2.0/.
-- Maintainer  : Brendan Hay <brendan.g.hay@gmail.com>
-- Stability   : experimental
-- Portability : non-portable (GHC extensions)
--
-- Derived from AWS service descriptions, licensed under Apache 2.0.

-- | Gets the expressions configured for the search domain. Can be limited to
-- specific expressions by name. By default, shows all expressions and includes
-- any pending changes to the configuration. Set the 'Deployed' option to 'true' to
-- show the active configuration and exclude pending changes. For more
-- information, see Configuring Expressions in the /Amazon CloudSearch DeveloperGuide/.
--
-- <http://docs.aws.amazon.com/cloudsearch/latest/developerguide/API_DescribeExpressions.html>
module Network.AWS.CloudSearch.DescribeExpressions
    (
    -- * Request
      DescribeExpressions
    -- ** Request constructor
    , describeExpressions
    -- ** Request lenses
    , deDeployed
    , deDomainName
    , deExpressionNames

    -- * Response
    , DescribeExpressionsResponse
    -- ** Response constructor
    , describeExpressionsResponse
    -- ** Response lenses
    , derExpressions
    ) where

import Network.AWS.Prelude
import Network.AWS.Request.Query
import Network.AWS.CloudSearch.Types
import qualified GHC.Exts

data DescribeExpressions = DescribeExpressions
    { _deDeployed        :: Maybe Bool
    , _deDomainName      :: Text
    , _deExpressionNames :: List "member" Text
    } deriving (Eq, Ord, Show)

-- | 'DescribeExpressions' constructor.
--
-- The fields accessible through corresponding lenses are:
--
-- * 'deDeployed' @::@ 'Maybe' 'Bool'
--
-- * 'deDomainName' @::@ 'Text'
--
-- * 'deExpressionNames' @::@ ['Text']
--
describeExpressions :: Text -- ^ 'deDomainName'
                    -> DescribeExpressions
describeExpressions p1 = DescribeExpressions
    { _deDomainName      = p1
    , _deExpressionNames = mempty
    , _deDeployed        = Nothing
    }

-- | Whether to display the deployed configuration ('true') or include any pending
-- changes ('false'). Defaults to 'false'.
deDeployed :: Lens' DescribeExpressions (Maybe Bool)
deDeployed = lens _deDeployed (\s a -> s { _deDeployed = a })

-- | The name of the domain you want to describe.
deDomainName :: Lens' DescribeExpressions Text
deDomainName = lens _deDomainName (\s a -> s { _deDomainName = a })

-- | Limits the ''DescribeExpressions' response to the specified expressions. If not
-- specified, all expressions are shown.
deExpressionNames :: Lens' DescribeExpressions [Text]
deExpressionNames =
    lens _deExpressionNames (\s a -> s { _deExpressionNames = a })
        . _List

newtype DescribeExpressionsResponse = DescribeExpressionsResponse
    { _derExpressions :: List "member" ExpressionStatus
    } deriving (Eq, Show, Monoid, Semigroup)

instance GHC.Exts.IsList DescribeExpressionsResponse where
    type Item DescribeExpressionsResponse = ExpressionStatus

    fromList = DescribeExpressionsResponse . GHC.Exts.fromList
    toList   = GHC.Exts.toList . _derExpressions

-- | 'DescribeExpressionsResponse' constructor.
--
-- The fields accessible through corresponding lenses are:
--
-- * 'derExpressions' @::@ ['ExpressionStatus']
--
describeExpressionsResponse :: DescribeExpressionsResponse
describeExpressionsResponse = DescribeExpressionsResponse
    { _derExpressions = mempty
    }

-- | The expressions configured for the domain.
derExpressions :: Lens' DescribeExpressionsResponse [ExpressionStatus]
derExpressions = lens _derExpressions (\s a -> s { _derExpressions = a }) . _List

instance ToPath DescribeExpressions where
    toPath = const "/"

instance ToQuery DescribeExpressions where
    toQuery DescribeExpressions{..} = mconcat
        [ "Deployed"        =? _deDeployed
        , "DomainName"      =? _deDomainName
        , "ExpressionNames" =? _deExpressionNames
        ]

instance ToHeaders DescribeExpressions

instance AWSRequest DescribeExpressions where
    type Sv DescribeExpressions = CloudSearch
    type Rs DescribeExpressions = DescribeExpressionsResponse

    request  = post "DescribeExpressions"
    response = xmlResponse

instance FromXML DescribeExpressionsResponse where
    parseXML = withElement "DescribeExpressionsResult" $ \x -> DescribeExpressionsResponse
        <$> x .@? "Expressions" .!@ mempty