{-# 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.ListOpenWorkflowExecutions
-- 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 a list of open workflow executions in the specified domain that
-- meet the filtering criteria. The results may be split into multiple
-- pages. To retrieve subsequent pages, make the call again using the
-- nextPageToken returned by the initial call.
--
-- 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_ListOpenWorkflowExecutions.html AWS API Reference> for ListOpenWorkflowExecutions.
--
-- This operation returns paginated results.
module Network.AWS.SWF.ListOpenWorkflowExecutions
    (
    -- * Creating a Request
      listOpenWorkflowExecutions
    , ListOpenWorkflowExecutions
    -- * Request Lenses
    , loweNextPageToken
    , loweExecutionFilter
    , loweTypeFilter
    , loweReverseOrder
    , loweTagFilter
    , loweMaximumPageSize
    , loweDomain
    , loweStartTimeFilter

    -- * Destructuring the Response
    , workflowExecutionInfos
    , WorkflowExecutionInfos
    -- * Response Lenses
    , weiNextPageToken
    , weiExecutionInfos
    ) where

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

-- | /See:/ 'listOpenWorkflowExecutions' smart constructor.
data ListOpenWorkflowExecutions = ListOpenWorkflowExecutions'
    { _loweNextPageToken   :: !(Maybe Text)
    , _loweExecutionFilter :: !(Maybe WorkflowExecutionFilter)
    , _loweTypeFilter      :: !(Maybe WorkflowTypeFilter)
    , _loweReverseOrder    :: !(Maybe Bool)
    , _loweTagFilter       :: !(Maybe TagFilter)
    , _loweMaximumPageSize :: !(Maybe Nat)
    , _loweDomain          :: !Text
    , _loweStartTimeFilter :: !ExecutionTimeFilter
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'ListOpenWorkflowExecutions' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'loweNextPageToken'
--
-- * 'loweExecutionFilter'
--
-- * 'loweTypeFilter'
--
-- * 'loweReverseOrder'
--
-- * 'loweTagFilter'
--
-- * 'loweMaximumPageSize'
--
-- * 'loweDomain'
--
-- * 'loweStartTimeFilter'
listOpenWorkflowExecutions
    :: Text -- ^ 'loweDomain'
    -> ExecutionTimeFilter -- ^ 'loweStartTimeFilter'
    -> ListOpenWorkflowExecutions
listOpenWorkflowExecutions pDomain_ pStartTimeFilter_ =
    ListOpenWorkflowExecutions'
    { _loweNextPageToken = Nothing
    , _loweExecutionFilter = Nothing
    , _loweTypeFilter = Nothing
    , _loweReverseOrder = Nothing
    , _loweTagFilter = Nothing
    , _loweMaximumPageSize = Nothing
    , _loweDomain = pDomain_
    , _loweStartTimeFilter = pStartTimeFilter_
    }

-- | If a 'NextPageToken' was returned by a previous call, there are more
-- results available. To retrieve the next page of results, make the call
-- again using the returned token in 'nextPageToken'. Keep all other
-- arguments unchanged.
--
-- The configured 'maximumPageSize' determines how many results can be
-- returned in a single call.
loweNextPageToken :: Lens' ListOpenWorkflowExecutions (Maybe Text)
loweNextPageToken = lens _loweNextPageToken (\ s a -> s{_loweNextPageToken = a});

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

-- | If specified, only executions of the type specified in the filter are
-- returned.
--
-- 'executionFilter', 'typeFilter' and 'tagFilter' are mutually exclusive.
-- You can specify at most one of these in a request.
loweTypeFilter :: Lens' ListOpenWorkflowExecutions (Maybe WorkflowTypeFilter)
loweTypeFilter = lens _loweTypeFilter (\ s a -> s{_loweTypeFilter = a});

-- | When set to 'true', returns the results in reverse order. By default the
-- results are returned in descending order of the start time of the
-- executions.
loweReverseOrder :: Lens' ListOpenWorkflowExecutions (Maybe Bool)
loweReverseOrder = lens _loweReverseOrder (\ s a -> s{_loweReverseOrder = a});

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

-- | The maximum number of results that will be returned per call.
-- 'nextPageToken' can be used to obtain futher pages of results. The
-- default is 1000, which is the maximum allowed page size. You can,
-- however, specify a page size /smaller/ than the maximum.
--
-- This is an upper limit only; the actual number of results returned per
-- call may be fewer than the specified maximum.
loweMaximumPageSize :: Lens' ListOpenWorkflowExecutions (Maybe Natural)
loweMaximumPageSize = lens _loweMaximumPageSize (\ s a -> s{_loweMaximumPageSize = a}) . mapping _Nat;

-- | The name of the domain that contains the workflow executions to list.
loweDomain :: Lens' ListOpenWorkflowExecutions Text
loweDomain = lens _loweDomain (\ s a -> s{_loweDomain = a});

-- | Workflow executions are included in the returned results based on
-- whether their start times are within the range specified by this filter.
loweStartTimeFilter :: Lens' ListOpenWorkflowExecutions ExecutionTimeFilter
loweStartTimeFilter = lens _loweStartTimeFilter (\ s a -> s{_loweStartTimeFilter = a});

instance AWSPager ListOpenWorkflowExecutions where
        page rq rs
          | stop (rs ^. weiNextPageToken) = Nothing
          | stop (rs ^. weiExecutionInfos) = Nothing
          | otherwise =
            Just $ rq &
              loweNextPageToken .~ rs ^. weiNextPageToken

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

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

instance ToJSON ListOpenWorkflowExecutions where
        toJSON ListOpenWorkflowExecutions'{..}
          = object
              (catMaybes
                 [("nextPageToken" .=) <$> _loweNextPageToken,
                  ("executionFilter" .=) <$> _loweExecutionFilter,
                  ("typeFilter" .=) <$> _loweTypeFilter,
                  ("reverseOrder" .=) <$> _loweReverseOrder,
                  ("tagFilter" .=) <$> _loweTagFilter,
                  ("maximumPageSize" .=) <$> _loweMaximumPageSize,
                  Just ("domain" .= _loweDomain),
                  Just ("startTimeFilter" .= _loweStartTimeFilter)])

instance ToPath ListOpenWorkflowExecutions where
        toPath = const "/"

instance ToQuery ListOpenWorkflowExecutions where
        toQuery = const mempty