{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}

-- | http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-waf-rule.html

module Stratosphere.Resources.WAFRule where

import Control.Lens hiding ((.=))
import Data.Aeson
import Data.Maybe (catMaybes)
import Data.Monoid (mempty)
import Data.Text

import Stratosphere.Values
import Stratosphere.ResourceProperties.WAFRulePredicate

-- | Full data type definition for WAFRule. See 'wafRule' for a more
-- convenient constructor.
data WAFRule =
  WAFRule
  { _wAFRuleMetricName :: Val Text
  , _wAFRuleName :: Val Text
  , _wAFRulePredicates :: Maybe [WAFRulePredicate]
  } deriving (Show, Eq)

instance ToJSON WAFRule where
  toJSON WAFRule{..} =
    object $
    catMaybes
    [ Just ("MetricName" .= _wAFRuleMetricName)
    , Just ("Name" .= _wAFRuleName)
    , ("Predicates" .=) <$> _wAFRulePredicates
    ]

instance FromJSON WAFRule where
  parseJSON (Object obj) =
    WAFRule <$>
      obj .: "MetricName" <*>
      obj .: "Name" <*>
      obj .:? "Predicates"
  parseJSON _ = mempty

-- | Constructor for 'WAFRule' containing required fields as arguments.
wafRule
  :: Val Text -- ^ 'wafrMetricName'
  -> Val Text -- ^ 'wafrName'
  -> WAFRule
wafRule metricNamearg namearg =
  WAFRule
  { _wAFRuleMetricName = metricNamearg
  , _wAFRuleName = namearg
  , _wAFRulePredicates = Nothing
  }

-- | http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-waf-rule.html#cfn-waf-rule-metricname
wafrMetricName :: Lens' WAFRule (Val Text)
wafrMetricName = lens _wAFRuleMetricName (\s a -> s { _wAFRuleMetricName = a })

-- | http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-waf-rule.html#cfn-waf-rule-name
wafrName :: Lens' WAFRule (Val Text)
wafrName = lens _wAFRuleName (\s a -> s { _wAFRuleName = a })

-- | http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-waf-rule.html#cfn-waf-rule-predicates
wafrPredicates :: Lens' WAFRule (Maybe [WAFRulePredicate])
wafrPredicates = lens _wAFRulePredicates (\s a -> s { _wAFRulePredicates = a })