{-# 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.SWF.CountOpenWorkflowExecutions
-- Copyright   : (c) 2013-2015 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)
--
-- Returns the number of open workflow executions within the given domain
-- that meet the specified filtering criteria.
--
-- This operation is eventually consistent. The results are best effort and
-- may not exactly reflect recent updates and changes.
--
-- __Access Control__
--
-- You can use IAM policies to control this action\'s access to Amazon SWF
-- resources as follows:
--
-- -   Use a 'Resource' element with the domain name to limit the action to
--     only specified domains.
-- -   Use an 'Action' element to allow or deny permission to call this
--     action.
-- -   Constrain the following parameters by using a 'Condition' element
--     with the appropriate keys.
--     -   'tagFilter.tag': String constraint. The key is
--         'swf:tagFilter.tag'.
--     -   'typeFilter.name': String constraint. The key is
--         'swf:typeFilter.name'.
--     -   'typeFilter.version': String constraint. The key is
--         'swf:typeFilter.version'.
--
-- If the caller does not have sufficient permissions to invoke the action,
-- or the parameter values fall outside the specified constraints, the
-- action fails. The associated event attribute\'s __cause__ parameter will
-- be set to OPERATION_NOT_PERMITTED. For details and example IAM policies,
-- see
-- <http://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-iam.html Using IAM to Manage Access to Amazon SWF Workflows>.
--
-- /See:/ <http://docs.aws.amazon.com/amazonswf/latest/apireference/API_CountOpenWorkflowExecutions.html AWS API Reference> for CountOpenWorkflowExecutions.
module Network.AWS.SWF.CountOpenWorkflowExecutions
    (
    -- * Creating a Request
      countOpenWorkflowExecutions
    , CountOpenWorkflowExecutions
    -- * Request Lenses
    , coweExecutionFilter
    , coweTypeFilter
    , coweTagFilter
    , coweDomain
    , coweStartTimeFilter

    -- * Destructuring the Response
    , workflowExecutionCount
    , WorkflowExecutionCount
    -- * Response Lenses
    , wecTruncated
    , wecCount
    ) where

import           Network.AWS.Prelude
import           Network.AWS.Request
import           Network.AWS.Response
import           Network.AWS.SWF.Types
import           Network.AWS.SWF.Types.Product

-- | /See:/ 'countOpenWorkflowExecutions' smart constructor.
data CountOpenWorkflowExecutions = CountOpenWorkflowExecutions'
    { _coweExecutionFilter :: !(Maybe WorkflowExecutionFilter)
    , _coweTypeFilter      :: !(Maybe WorkflowTypeFilter)
    , _coweTagFilter       :: !(Maybe TagFilter)
    , _coweDomain          :: !Text
    , _coweStartTimeFilter :: !ExecutionTimeFilter
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'CountOpenWorkflowExecutions' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'coweExecutionFilter'
--
-- * 'coweTypeFilter'
--
-- * 'coweTagFilter'
--
-- * 'coweDomain'
--
-- * 'coweStartTimeFilter'
countOpenWorkflowExecutions
    :: Text -- ^ 'coweDomain'
    -> ExecutionTimeFilter -- ^ 'coweStartTimeFilter'
    -> CountOpenWorkflowExecutions
countOpenWorkflowExecutions pDomain_ pStartTimeFilter_ =
    CountOpenWorkflowExecutions'
    { _coweExecutionFilter = Nothing
    , _coweTypeFilter = Nothing
    , _coweTagFilter = Nothing
    , _coweDomain = pDomain_
    , _coweStartTimeFilter = pStartTimeFilter_
    }

-- | If specified, only workflow executions matching the 'WorkflowId' in the
-- filter are counted.
--
-- 'executionFilter', 'typeFilter' and 'tagFilter' are mutually exclusive.
-- You can specify at most one of these in a request.
coweExecutionFilter :: Lens' CountOpenWorkflowExecutions (Maybe WorkflowExecutionFilter)
coweExecutionFilter = lens _coweExecutionFilter (\ s a -> s{_coweExecutionFilter = a});

-- | Specifies the type of the workflow executions to be counted.
--
-- 'executionFilter', 'typeFilter' and 'tagFilter' are mutually exclusive.
-- You can specify at most one of these in a request.
coweTypeFilter :: Lens' CountOpenWorkflowExecutions (Maybe WorkflowTypeFilter)
coweTypeFilter = lens _coweTypeFilter (\ s a -> s{_coweTypeFilter = a});

-- | If specified, only executions that have a tag that matches the filter
-- are counted.
--
-- 'executionFilter', 'typeFilter' and 'tagFilter' are mutually exclusive.
-- You can specify at most one of these in a request.
coweTagFilter :: Lens' CountOpenWorkflowExecutions (Maybe TagFilter)
coweTagFilter = lens _coweTagFilter (\ s a -> s{_coweTagFilter = a});

-- | The name of the domain containing the workflow executions to count.
coweDomain :: Lens' CountOpenWorkflowExecutions Text
coweDomain = lens _coweDomain (\ s a -> s{_coweDomain = a});

-- | Specifies the start time criteria that workflow executions must meet in
-- order to be counted.
coweStartTimeFilter :: Lens' CountOpenWorkflowExecutions ExecutionTimeFilter
coweStartTimeFilter = lens _coweStartTimeFilter (\ s a -> s{_coweStartTimeFilter = a});

instance AWSRequest CountOpenWorkflowExecutions where
        type Rs CountOpenWorkflowExecutions =
             WorkflowExecutionCount
        request = postJSON sWF
        response = receiveJSON (\ s h x -> eitherParseJSON x)

instance ToHeaders CountOpenWorkflowExecutions where
        toHeaders
          = const
              (mconcat
                 ["X-Amz-Target" =#
                    ("SimpleWorkflowService.CountOpenWorkflowExecutions"
                       :: ByteString),
                  "Content-Type" =#
                    ("application/x-amz-json-1.0" :: ByteString)])

instance ToJSON CountOpenWorkflowExecutions where
        toJSON CountOpenWorkflowExecutions'{..}
          = object
              (catMaybes
                 [("executionFilter" .=) <$> _coweExecutionFilter,
                  ("typeFilter" .=) <$> _coweTypeFilter,
                  ("tagFilter" .=) <$> _coweTagFilter,
                  Just ("domain" .= _coweDomain),
                  Just ("startTimeFilter" .= _coweStartTimeFilter)])

instance ToPath CountOpenWorkflowExecutions where
        toPath = const "/"

instance ToQuery CountOpenWorkflowExecutions where
        toQuery = const mempty
