{-# 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.GameLift.PutScalingPolicy
-- 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)
--
-- Creates or updates a scaling policy for a fleet. An active scaling
-- policy prompts GameLift to track a certain metric for a fleet and
-- automatically change the fleet\'s capacity in specific circumstances.
-- Each scaling policy contains one rule statement. Fleets can have
-- multiple scaling policies in force simultaneously.
--
-- A scaling policy rule statement has the following structure:
--
-- If /[MetricName]/ is /[ComparisonOperator]/ /[Threshold]/ for
-- /[EvaluationPeriods]/ minutes, then /[ScalingAdjustmentType]/ to\/by
-- /[ScalingAdjustment]/.
--
-- For example, this policy: \"If the number of idle instances exceeds 20
-- for more than 15 minutes, then reduce the fleet capacity by 10
-- instances\" could be implemented as the following rule statement:
--
-- If [IdleInstances] is [GreaterThanOrEqualToThreshold] [20] for [15]
-- minutes, then [ChangeInCapacity] by [-10].
--
-- To create or update a scaling policy, specify a unique combination of
-- name and fleet ID, and set the rule values. All parameters for this
-- action are required. If successful, the policy name is returned. Scaling
-- policies cannot be suspended or made inactive. To stop enforcing a
-- scaling policy, call < DeleteScalingPolicy>.
module Network.AWS.GameLift.PutScalingPolicy
    (
    -- * Creating a Request
      putScalingPolicy
    , PutScalingPolicy
    -- * Request Lenses
    , pspName
    , pspFleetId
    , pspScalingAdjustment
    , pspScalingAdjustmentType
    , pspThreshold
    , pspComparisonOperator
    , pspEvaluationPeriods
    , pspMetricName

    -- * Destructuring the Response
    , putScalingPolicyResponse
    , PutScalingPolicyResponse
    -- * Response Lenses
    , psprsName
    , psprsResponseStatus
    ) where

import           Network.AWS.GameLift.Types
import           Network.AWS.GameLift.Types.Product
import           Network.AWS.Lens
import           Network.AWS.Prelude
import           Network.AWS.Request
import           Network.AWS.Response

-- | Represents the input for a request action.
--
-- /See:/ 'putScalingPolicy' smart constructor.
data PutScalingPolicy = PutScalingPolicy'
    { _pspName                  :: !Text
    , _pspFleetId               :: !Text
    , _pspScalingAdjustment     :: !Int
    , _pspScalingAdjustmentType :: !ScalingAdjustmentType
    , _pspThreshold             :: !Double
    , _pspComparisonOperator    :: !ComparisonOperatorType
    , _pspEvaluationPeriods     :: !Nat
    , _pspMetricName            :: !MetricName
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'PutScalingPolicy' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'pspName'
--
-- * 'pspFleetId'
--
-- * 'pspScalingAdjustment'
--
-- * 'pspScalingAdjustmentType'
--
-- * 'pspThreshold'
--
-- * 'pspComparisonOperator'
--
-- * 'pspEvaluationPeriods'
--
-- * 'pspMetricName'
putScalingPolicy
    :: Text -- ^ 'pspName'
    -> Text -- ^ 'pspFleetId'
    -> Int -- ^ 'pspScalingAdjustment'
    -> ScalingAdjustmentType -- ^ 'pspScalingAdjustmentType'
    -> Double -- ^ 'pspThreshold'
    -> ComparisonOperatorType -- ^ 'pspComparisonOperator'
    -> Natural -- ^ 'pspEvaluationPeriods'
    -> MetricName -- ^ 'pspMetricName'
    -> PutScalingPolicy
putScalingPolicy pName_ pFleetId_ pScalingAdjustment_ pScalingAdjustmentType_ pThreshold_ pComparisonOperator_ pEvaluationPeriods_ pMetricName_ =
    PutScalingPolicy'
    { _pspName = pName_
    , _pspFleetId = pFleetId_
    , _pspScalingAdjustment = pScalingAdjustment_
    , _pspScalingAdjustmentType = pScalingAdjustmentType_
    , _pspThreshold = pThreshold_
    , _pspComparisonOperator = pComparisonOperator_
    , _pspEvaluationPeriods = _Nat # pEvaluationPeriods_
    , _pspMetricName = pMetricName_
    }

-- | Descriptive label associated with this scaling policy. Policy names do
-- not need to be unique. A fleet can have only one scaling policy with the
-- same name.
pspName :: Lens' PutScalingPolicy Text
pspName = lens _pspName (\ s a -> s{_pspName = a});

-- | Unique identity for the fleet to scale with this policy.
pspFleetId :: Lens' PutScalingPolicy Text
pspFleetId = lens _pspFleetId (\ s a -> s{_pspFleetId = a});

-- | Amount of adjustment to make, based on the scaling adjustment type.
pspScalingAdjustment :: Lens' PutScalingPolicy Int
pspScalingAdjustment = lens _pspScalingAdjustment (\ s a -> s{_pspScalingAdjustment = a});

-- | Type of adjustment to make to a fleet\'s instance count (see
-- < FleetCapacity>):
--
-- -   ChangeInCapacity: add (or subtract) the scaling adjustment value
--     from the current instance count. Positive values scale up while
--     negative values scale down.
-- -   ExactCapacity: set the instance count to the scaling adjustment
--     value.
-- -   PercentChangeInCapacity: increase or reduce the current instance
--     count by the scaling adjustment, read as a percentage. Positive
--     values scale up while negative values scale down; for example, a
--     value of \"-10\" scales the fleet down by 10%.
pspScalingAdjustmentType :: Lens' PutScalingPolicy ScalingAdjustmentType
pspScalingAdjustmentType = lens _pspScalingAdjustmentType (\ s a -> s{_pspScalingAdjustmentType = a});

-- | Metric value used to trigger a scaling event.
pspThreshold :: Lens' PutScalingPolicy Double
pspThreshold = lens _pspThreshold (\ s a -> s{_pspThreshold = a});

-- | Comparison operator to use when measuring the metric against the
-- threshold value.
pspComparisonOperator :: Lens' PutScalingPolicy ComparisonOperatorType
pspComparisonOperator = lens _pspComparisonOperator (\ s a -> s{_pspComparisonOperator = a});

-- | Length of time (in minutes) the metric must be at or beyond the
-- threshold before a scaling event is triggered.
pspEvaluationPeriods :: Lens' PutScalingPolicy Natural
pspEvaluationPeriods = lens _pspEvaluationPeriods (\ s a -> s{_pspEvaluationPeriods = a}) . _Nat;

-- | Name of the Service-defined metric that is used to trigger an
-- adjustment.
--
-- -   ActivatingGameSessions: number of game sessions in the process of
--     being created (game session status = ACTIVATING).
-- -   ActiveGameSessions: number of game sessions currently running (game
--     session status = ACTIVE).
-- -   CurrentPlayerSessions: number of active or reserved player sessions
--     (player session status = ACTIVE or RESERVED).
-- -   AvailablePlayerSessions: number of player session slots currently
--     available in active game sessions across the fleet, calculated by
--     subtracting a game session\'s current player session count from its
--     maximum player session count. This number includes game sessions
--     that are not currently accepting players (game session
--     PlayerSessionCreationPolicy = DENY_ALL).
-- -   ActiveInstances: number of instances currently running a game
--     session.
-- -   IdleInstances: number of instances not currently running a game
--     session.
pspMetricName :: Lens' PutScalingPolicy MetricName
pspMetricName = lens _pspMetricName (\ s a -> s{_pspMetricName = a});

instance AWSRequest PutScalingPolicy where
        type Rs PutScalingPolicy = PutScalingPolicyResponse
        request = postJSON gameLift
        response
          = receiveJSON
              (\ s h x ->
                 PutScalingPolicyResponse' <$>
                   (x .?> "Name") <*> (pure (fromEnum s)))

instance Hashable PutScalingPolicy

instance ToHeaders PutScalingPolicy where
        toHeaders
          = const
              (mconcat
                 ["X-Amz-Target" =#
                    ("GameLift.PutScalingPolicy" :: ByteString),
                  "Content-Type" =#
                    ("application/x-amz-json-1.1" :: ByteString)])

instance ToJSON PutScalingPolicy where
        toJSON PutScalingPolicy'{..}
          = object
              (catMaybes
                 [Just ("Name" .= _pspName),
                  Just ("FleetId" .= _pspFleetId),
                  Just ("ScalingAdjustment" .= _pspScalingAdjustment),
                  Just
                    ("ScalingAdjustmentType" .=
                       _pspScalingAdjustmentType),
                  Just ("Threshold" .= _pspThreshold),
                  Just
                    ("ComparisonOperator" .= _pspComparisonOperator),
                  Just ("EvaluationPeriods" .= _pspEvaluationPeriods),
                  Just ("MetricName" .= _pspMetricName)])

instance ToPath PutScalingPolicy where
        toPath = const "/"

instance ToQuery PutScalingPolicy where
        toQuery = const mempty

-- | Represents the returned data in response to a request action.
--
-- /See:/ 'putScalingPolicyResponse' smart constructor.
data PutScalingPolicyResponse = PutScalingPolicyResponse'
    { _psprsName           :: !(Maybe Text)
    , _psprsResponseStatus :: !Int
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'PutScalingPolicyResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'psprsName'
--
-- * 'psprsResponseStatus'
putScalingPolicyResponse
    :: Int -- ^ 'psprsResponseStatus'
    -> PutScalingPolicyResponse
putScalingPolicyResponse pResponseStatus_ =
    PutScalingPolicyResponse'
    { _psprsName = Nothing
    , _psprsResponseStatus = pResponseStatus_
    }

-- | Descriptive label associated with this scaling policy. Policy names do
-- not need to be unique.
psprsName :: Lens' PutScalingPolicyResponse (Maybe Text)
psprsName = lens _psprsName (\ s a -> s{_psprsName = a});

-- | The response status code.
psprsResponseStatus :: Lens' PutScalingPolicyResponse Int
psprsResponseStatus = lens _psprsResponseStatus (\ s a -> s{_psprsResponseStatus = a});