{-# 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.ElasticTranscoder.ListPipelines
-- 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.

-- | The ListPipelines operation gets a list of the pipelines associated with the
-- current AWS account.
--
-- <http://docs.aws.amazon.com/elastictranscoder/latest/developerguide/ListPipelines.html>
module Network.AWS.ElasticTranscoder.ListPipelines
    (
    -- * Request
      ListPipelines
    -- ** Request constructor
    , listPipelines
    -- ** Request lenses
    , lpAscending
    , lpPageToken

    -- * Response
    , ListPipelinesResponse
    -- ** Response constructor
    , listPipelinesResponse
    -- ** Response lenses
    , lprNextPageToken
    , lprPipelines
    ) where

import Network.AWS.Data (Object)
import Network.AWS.Prelude
import Network.AWS.Request.RestJSON
import Network.AWS.ElasticTranscoder.Types
import qualified GHC.Exts

data ListPipelines = ListPipelines
    { _lpAscending :: Maybe Text
    , _lpPageToken :: Maybe Text
    } deriving (Eq, Ord, Read, Show)

-- | 'ListPipelines' constructor.
--
-- The fields accessible through corresponding lenses are:
--
-- * 'lpAscending' @::@ 'Maybe' 'Text'
--
-- * 'lpPageToken' @::@ 'Maybe' 'Text'
--
listPipelines :: ListPipelines
listPipelines = ListPipelines
    { _lpAscending = Nothing
    , _lpPageToken = Nothing
    }

-- | To list pipelines in chronological order by the date and time that they were
-- created, enter 'true'. To list pipelines in reverse chronological order, enter 'false'.
lpAscending :: Lens' ListPipelines (Maybe Text)
lpAscending = lens _lpAscending (\s a -> s { _lpAscending = a })

-- | When Elastic Transcoder returns more than one page of results, use 'pageToken'
-- in subsequent 'GET' requests to get each successive page of results.
lpPageToken :: Lens' ListPipelines (Maybe Text)
lpPageToken = lens _lpPageToken (\s a -> s { _lpPageToken = a })

data ListPipelinesResponse = ListPipelinesResponse
    { _lprNextPageToken :: Maybe Text
    , _lprPipelines     :: List "Pipelines" Pipeline
    } deriving (Eq, Read, Show)

-- | 'ListPipelinesResponse' constructor.
--
-- The fields accessible through corresponding lenses are:
--
-- * 'lprNextPageToken' @::@ 'Maybe' 'Text'
--
-- * 'lprPipelines' @::@ ['Pipeline']
--
listPipelinesResponse :: ListPipelinesResponse
listPipelinesResponse = ListPipelinesResponse
    { _lprPipelines     = mempty
    , _lprNextPageToken = Nothing
    }

-- | A value that you use to access the second and subsequent pages of results, if
-- any. When the pipelines fit on one page or when you've reached the last page
-- of results, the value of 'NextPageToken' is 'null'.
lprNextPageToken :: Lens' ListPipelinesResponse (Maybe Text)
lprNextPageToken = lens _lprNextPageToken (\s a -> s { _lprNextPageToken = a })

-- | An array of 'Pipeline' objects.
lprPipelines :: Lens' ListPipelinesResponse [Pipeline]
lprPipelines = lens _lprPipelines (\s a -> s { _lprPipelines = a }) . _List

instance ToPath ListPipelines where
    toPath = const "/2012-09-25/pipelines"

instance ToQuery ListPipelines where
    toQuery ListPipelines{..} = mconcat
        [ "Ascending" =? _lpAscending
        , "PageToken" =? _lpPageToken
        ]

instance ToHeaders ListPipelines

instance ToJSON ListPipelines where
    toJSON = const (toJSON Empty)

instance AWSRequest ListPipelines where
    type Sv ListPipelines = ElasticTranscoder
    type Rs ListPipelines = ListPipelinesResponse

    request  = get
    response = jsonResponse

instance FromJSON ListPipelinesResponse where
    parseJSON = withObject "ListPipelinesResponse" $ \o -> ListPipelinesResponse
        <$> o .:? "NextPageToken"
        <*> o .:? "Pipelines" .!= mempty

instance AWSPager ListPipelines where
    page rq rs
        | stop (rs ^. lprNextPageToken) = Nothing
        | otherwise = (\x -> rq & lpPageToken ?~ x)
            <$> (rs ^. lprNextPageToken)