{-# 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.CloudWatchEvents.ListRules
-- 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)
--
-- Lists the Amazon CloudWatch Events rules in your account. You can either list all the rules or you can provide a prefix to match to the rule names. If you have more rules in your account than the given limit, the results will be paginated. In that case, use the next token returned in the response and repeat ListRules until the NextToken in the response is returned as null.
module Network.AWS.CloudWatchEvents.ListRules
    (
    -- * Creating a Request
      listRules
    , ListRules
    -- * Request Lenses
    , lrNextToken
    , lrNamePrefix
    , lrLimit

    -- * Destructuring the Response
    , listRulesResponse
    , ListRulesResponse
    -- * Response Lenses
    , lrrsRules
    , lrrsNextToken
    , lrrsResponseStatus
    ) where

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

-- | Container for the parameters to the < ListRules> operation.
--
-- /See:/ 'listRules' smart constructor.
data ListRules = ListRules'
    { _lrNextToken  :: !(Maybe Text)
    , _lrNamePrefix :: !(Maybe Text)
    , _lrLimit      :: !(Maybe Nat)
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'ListRules' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'lrNextToken'
--
-- * 'lrNamePrefix'
--
-- * 'lrLimit'
listRules
    :: ListRules
listRules =
    ListRules'
    { _lrNextToken = Nothing
    , _lrNamePrefix = Nothing
    , _lrLimit = Nothing
    }

-- | The token returned by a previous call to indicate that there is more data available.
lrNextToken :: Lens' ListRules (Maybe Text)
lrNextToken = lens _lrNextToken (\ s a -> s{_lrNextToken = a});

-- | The prefix matching the rule name.
lrNamePrefix :: Lens' ListRules (Maybe Text)
lrNamePrefix = lens _lrNamePrefix (\ s a -> s{_lrNamePrefix = a});

-- | The maximum number of results to return.
lrLimit :: Lens' ListRules (Maybe Natural)
lrLimit = lens _lrLimit (\ s a -> s{_lrLimit = a}) . mapping _Nat;

instance AWSRequest ListRules where
        type Rs ListRules = ListRulesResponse
        request = postJSON cloudWatchEvents
        response
          = receiveJSON
              (\ s h x ->
                 ListRulesResponse' <$>
                   (x .?> "Rules" .!@ mempty) <*> (x .?> "NextToken")
                     <*> (pure (fromEnum s)))

instance Hashable ListRules

instance NFData ListRules

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

instance ToJSON ListRules where
        toJSON ListRules'{..}
          = object
              (catMaybes
                 [("NextToken" .=) <$> _lrNextToken,
                  ("NamePrefix" .=) <$> _lrNamePrefix,
                  ("Limit" .=) <$> _lrLimit])

instance ToPath ListRules where
        toPath = const "/"

instance ToQuery ListRules where
        toQuery = const mempty

-- | The result of the < ListRules> operation.
--
-- /See:/ 'listRulesResponse' smart constructor.
data ListRulesResponse = ListRulesResponse'
    { _lrrsRules          :: !(Maybe [Rule])
    , _lrrsNextToken      :: !(Maybe Text)
    , _lrrsResponseStatus :: !Int
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'ListRulesResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'lrrsRules'
--
-- * 'lrrsNextToken'
--
-- * 'lrrsResponseStatus'
listRulesResponse
    :: Int -- ^ 'lrrsResponseStatus'
    -> ListRulesResponse
listRulesResponse pResponseStatus_ =
    ListRulesResponse'
    { _lrrsRules = Nothing
    , _lrrsNextToken = Nothing
    , _lrrsResponseStatus = pResponseStatus_
    }

-- | List of rules matching the specified criteria.
lrrsRules :: Lens' ListRulesResponse [Rule]
lrrsRules = lens _lrrsRules (\ s a -> s{_lrrsRules = a}) . _Default . _Coerce;

-- | Indicates that there are additional results to retrieve.
lrrsNextToken :: Lens' ListRulesResponse (Maybe Text)
lrrsNextToken = lens _lrrsNextToken (\ s a -> s{_lrrsNextToken = a});

-- | The response status code.
lrrsResponseStatus :: Lens' ListRulesResponse Int
lrrsResponseStatus = lens _lrrsResponseStatus (\ s a -> s{_lrrsResponseStatus = a});

instance NFData ListRulesResponse