{-# 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.ECS.RunTask
-- 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.

-- | Start a task using random placement and the default Amazon ECS scheduler. If
-- you want to use your own scheduler or place a task on a specific container
-- instance, use 'StartTask' instead.
--
-- <http://docs.aws.amazon.com/AmazonECS/latest/APIReference/API_RunTask.html>
module Network.AWS.ECS.RunTask
    (
    -- * Request
      RunTask
    -- ** Request constructor
    , runTask
    -- ** Request lenses
    , rtCluster
    , rtCount
    , rtOverrides
    , rtTaskDefinition

    -- * Response
    , RunTaskResponse
    -- ** Response constructor
    , runTaskResponse
    -- ** Response lenses
    , rtrFailures
    , rtrTasks
    ) where

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

data RunTask = RunTask
    { _rtCluster        :: Maybe Text
    , _rtCount          :: Maybe Int
    , _rtOverrides      :: Maybe TaskOverride
    , _rtTaskDefinition :: Text
    } deriving (Eq, Read, Show)

-- | 'RunTask' constructor.
--
-- The fields accessible through corresponding lenses are:
--
-- * 'rtCluster' @::@ 'Maybe' 'Text'
--
-- * 'rtCount' @::@ 'Maybe' 'Int'
--
-- * 'rtOverrides' @::@ 'Maybe' 'TaskOverride'
--
-- * 'rtTaskDefinition' @::@ 'Text'
--
runTask :: Text -- ^ 'rtTaskDefinition'
        -> RunTask
runTask p1 = RunTask
    { _rtTaskDefinition = p1
    , _rtCluster        = Nothing
    , _rtOverrides      = Nothing
    , _rtCount          = Nothing
    }

-- | The short name or full Amazon Resource Name (ARN) of the cluster that you
-- want to run your task on. If you do not specify a cluster, the default
-- cluster is assumed..
rtCluster :: Lens' RunTask (Maybe Text)
rtCluster = lens _rtCluster (\s a -> s { _rtCluster = a })

-- | The number of instances of the specified task that you would like to place on
-- your cluster.
rtCount :: Lens' RunTask (Maybe Int)
rtCount = lens _rtCount (\s a -> s { _rtCount = a })

rtOverrides :: Lens' RunTask (Maybe TaskOverride)
rtOverrides = lens _rtOverrides (\s a -> s { _rtOverrides = a })

-- | The 'family' and 'revision' ('family:revision') or full Amazon Resource Name (ARN)
-- of the task definition that you want to run.
rtTaskDefinition :: Lens' RunTask Text
rtTaskDefinition = lens _rtTaskDefinition (\s a -> s { _rtTaskDefinition = a })

data RunTaskResponse = RunTaskResponse
    { _rtrFailures :: List "member" Failure
    , _rtrTasks    :: List "member" Task
    } deriving (Eq, Read, Show)

-- | 'RunTaskResponse' constructor.
--
-- The fields accessible through corresponding lenses are:
--
-- * 'rtrFailures' @::@ ['Failure']
--
-- * 'rtrTasks' @::@ ['Task']
--
runTaskResponse :: RunTaskResponse
runTaskResponse = RunTaskResponse
    { _rtrTasks    = mempty
    , _rtrFailures = mempty
    }

-- | Any failed tasks from your 'RunTask' action are listed here.
rtrFailures :: Lens' RunTaskResponse [Failure]
rtrFailures = lens _rtrFailures (\s a -> s { _rtrFailures = a }) . _List

-- | A full description of the tasks that were run. Each task that was
-- successfully placed on your cluster will be described here.
rtrTasks :: Lens' RunTaskResponse [Task]
rtrTasks = lens _rtrTasks (\s a -> s { _rtrTasks = a }) . _List

instance ToPath RunTask where
    toPath = const "/"

instance ToQuery RunTask where
    toQuery RunTask{..} = mconcat
        [ "cluster"        =? _rtCluster
        , "count"          =? _rtCount
        , "overrides"      =? _rtOverrides
        , "taskDefinition" =? _rtTaskDefinition
        ]

instance ToHeaders RunTask

instance AWSRequest RunTask where
    type Sv RunTask = ECS
    type Rs RunTask = RunTaskResponse

    request  = post "RunTask"
    response = xmlResponse

instance FromXML RunTaskResponse where
    parseXML = withElement "RunTaskResult" $ \x -> RunTaskResponse
        <$> x .@? "failures" .!@ mempty
        <*> x .@? "tasks" .!@ mempty