{-# 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.EC2.DescribeSpotPriceHistory
-- 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)
--
-- Describes the Spot Price history. The prices returned are listed in
-- chronological order, from the oldest to the most recent, for up to the
-- past 90 days. For more information, see
-- <http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-spot-instances-history.html Spot Instance Pricing History>
-- in the /Amazon Elastic Compute Cloud User Guide/.
--
-- When you specify a start and end time, this operation returns the prices
-- of the instance types within the time range that you specified and the
-- time when the price changed. The price is valid within the time period
-- that you specified; the response merely indicates the last time that the
-- price changed.
--
-- /See:/ <http://docs.aws.amazon.com/AWSEC2/latest/APIReference/ApiReference-query-DescribeSpotPriceHistory.html AWS API Reference> for DescribeSpotPriceHistory.
--
-- This operation returns paginated results.
module Network.AWS.EC2.DescribeSpotPriceHistory
    (
    -- * Creating a Request
      describeSpotPriceHistory
    , DescribeSpotPriceHistory
    -- * Request Lenses
    , dsphInstanceTypes
    , dsphStartTime
    , dsphFilters
    , dsphNextToken
    , dsphAvailabilityZone
    , dsphEndTime
    , dsphProductDescriptions
    , dsphDryRun
    , dsphMaxResults

    -- * Destructuring the Response
    , describeSpotPriceHistoryResponse
    , DescribeSpotPriceHistoryResponse
    -- * Response Lenses
    , dsphrsNextToken
    , dsphrsSpotPriceHistory
    , dsphrsResponseStatus
    ) where

import           Network.AWS.EC2.Types
import           Network.AWS.EC2.Types.Product
import           Network.AWS.Pager
import           Network.AWS.Prelude
import           Network.AWS.Request
import           Network.AWS.Response

-- | Contains the parameters for DescribeSpotPriceHistory.
--
-- /See:/ 'describeSpotPriceHistory' smart constructor.
data DescribeSpotPriceHistory = DescribeSpotPriceHistory'
    { _dsphInstanceTypes       :: !(Maybe [InstanceType])
    , _dsphStartTime           :: !(Maybe ISO8601)
    , _dsphFilters             :: !(Maybe [Filter])
    , _dsphNextToken           :: !(Maybe Text)
    , _dsphAvailabilityZone    :: !(Maybe Text)
    , _dsphEndTime             :: !(Maybe ISO8601)
    , _dsphProductDescriptions :: !(Maybe [Text])
    , _dsphDryRun              :: !(Maybe Bool)
    , _dsphMaxResults          :: !(Maybe Int)
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeSpotPriceHistory' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'dsphInstanceTypes'
--
-- * 'dsphStartTime'
--
-- * 'dsphFilters'
--
-- * 'dsphNextToken'
--
-- * 'dsphAvailabilityZone'
--
-- * 'dsphEndTime'
--
-- * 'dsphProductDescriptions'
--
-- * 'dsphDryRun'
--
-- * 'dsphMaxResults'
describeSpotPriceHistory
    :: DescribeSpotPriceHistory
describeSpotPriceHistory =
    DescribeSpotPriceHistory'
    { _dsphInstanceTypes = Nothing
    , _dsphStartTime = Nothing
    , _dsphFilters = Nothing
    , _dsphNextToken = Nothing
    , _dsphAvailabilityZone = Nothing
    , _dsphEndTime = Nothing
    , _dsphProductDescriptions = Nothing
    , _dsphDryRun = Nothing
    , _dsphMaxResults = Nothing
    }

-- | Filters the results by the specified instance types.
dsphInstanceTypes :: Lens' DescribeSpotPriceHistory [InstanceType]
dsphInstanceTypes = lens _dsphInstanceTypes (\ s a -> s{_dsphInstanceTypes = a}) . _Default . _Coerce;

-- | The date and time, up to the past 90 days, from which to start
-- retrieving the price history data, in UTC format (for example,
-- /YYYY/-/MM/-/DD/T/HH/:/MM/:/SS/Z).
dsphStartTime :: Lens' DescribeSpotPriceHistory (Maybe UTCTime)
dsphStartTime = lens _dsphStartTime (\ s a -> s{_dsphStartTime = a}) . mapping _Time;

-- | One or more filters.
--
-- -   'availability-zone' - The Availability Zone for which prices should
--     be returned.
--
-- -   'instance-type' - The type of instance (for example, 'm1.small').
--
-- -   'product-description' - The product description for the Spot Price
--     ('Linux\/UNIX' | 'SUSE Linux' | 'Windows' |
--     'Linux\/UNIX (Amazon VPC)' | 'SUSE Linux (Amazon VPC)' |
--     'Windows (Amazon VPC)').
--
-- -   'spot-price' - The Spot Price. The value must match exactly (or use
--     wildcards; greater than or less than comparison is not supported).
--
-- -   'timestamp' - The timestamp of the Spot Price history, in UTC format
--     (for example, /YYYY/-/MM/-/DD/T/HH/:/MM/:/SS/Z). You can use
--     wildcards (* and ?). Greater than or less than comparison is not
--     supported.
--
dsphFilters :: Lens' DescribeSpotPriceHistory [Filter]
dsphFilters = lens _dsphFilters (\ s a -> s{_dsphFilters = a}) . _Default . _Coerce;

-- | The token for the next set of results.
dsphNextToken :: Lens' DescribeSpotPriceHistory (Maybe Text)
dsphNextToken = lens _dsphNextToken (\ s a -> s{_dsphNextToken = a});

-- | Filters the results by the specified Availability Zone.
dsphAvailabilityZone :: Lens' DescribeSpotPriceHistory (Maybe Text)
dsphAvailabilityZone = lens _dsphAvailabilityZone (\ s a -> s{_dsphAvailabilityZone = a});

-- | The date and time, up to the current date, from which to stop retrieving
-- the price history data, in UTC format (for example,
-- /YYYY/-/MM/-/DD/T/HH/:/MM/:/SS/Z).
dsphEndTime :: Lens' DescribeSpotPriceHistory (Maybe UTCTime)
dsphEndTime = lens _dsphEndTime (\ s a -> s{_dsphEndTime = a}) . mapping _Time;

-- | Filters the results by the specified basic product descriptions.
dsphProductDescriptions :: Lens' DescribeSpotPriceHistory [Text]
dsphProductDescriptions = lens _dsphProductDescriptions (\ s a -> s{_dsphProductDescriptions = a}) . _Default . _Coerce;

-- | Checks whether you have the required permissions for the action, without
-- actually making the request, and provides an error response. If you have
-- the required permissions, the error response is 'DryRunOperation'.
-- Otherwise, it is 'UnauthorizedOperation'.
dsphDryRun :: Lens' DescribeSpotPriceHistory (Maybe Bool)
dsphDryRun = lens _dsphDryRun (\ s a -> s{_dsphDryRun = a});

-- | The maximum number of results to return in a single call. Specify a
-- value between 1 and 1000. The default value is 1000. To retrieve the
-- remaining results, make another call with the returned 'NextToken'
-- value.
dsphMaxResults :: Lens' DescribeSpotPriceHistory (Maybe Int)
dsphMaxResults = lens _dsphMaxResults (\ s a -> s{_dsphMaxResults = a});

instance AWSPager DescribeSpotPriceHistory where
        page rq rs
          | stop (rs ^. dsphrsNextToken) = Nothing
          | stop (rs ^. dsphrsSpotPriceHistory) = Nothing
          | otherwise =
            Just $ rq & dsphNextToken .~ rs ^. dsphrsNextToken

instance AWSRequest DescribeSpotPriceHistory where
        type Rs DescribeSpotPriceHistory =
             DescribeSpotPriceHistoryResponse
        request = postQuery eC2
        response
          = receiveXML
              (\ s h x ->
                 DescribeSpotPriceHistoryResponse' <$>
                   (x .@? "nextToken") <*>
                     (x .@? "spotPriceHistorySet" .!@ mempty >>=
                        may (parseXMLList "item"))
                     <*> (pure (fromEnum s)))

instance ToHeaders DescribeSpotPriceHistory where
        toHeaders = const mempty

instance ToPath DescribeSpotPriceHistory where
        toPath = const "/"

instance ToQuery DescribeSpotPriceHistory where
        toQuery DescribeSpotPriceHistory'{..}
          = mconcat
              ["Action" =:
                 ("DescribeSpotPriceHistory" :: ByteString),
               "Version" =: ("2015-04-15" :: ByteString),
               toQuery
                 (toQueryList "InstanceType" <$> _dsphInstanceTypes),
               "StartTime" =: _dsphStartTime,
               toQuery (toQueryList "Filter" <$> _dsphFilters),
               "NextToken" =: _dsphNextToken,
               "AvailabilityZone" =: _dsphAvailabilityZone,
               "EndTime" =: _dsphEndTime,
               toQuery
                 (toQueryList "ProductDescription" <$>
                    _dsphProductDescriptions),
               "DryRun" =: _dsphDryRun,
               "MaxResults" =: _dsphMaxResults]

-- | Contains the output of DescribeSpotPriceHistory.
--
-- /See:/ 'describeSpotPriceHistoryResponse' smart constructor.
data DescribeSpotPriceHistoryResponse = DescribeSpotPriceHistoryResponse'
    { _dsphrsNextToken        :: !(Maybe Text)
    , _dsphrsSpotPriceHistory :: !(Maybe [SpotPrice])
    , _dsphrsResponseStatus   :: !Int
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'DescribeSpotPriceHistoryResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'dsphrsNextToken'
--
-- * 'dsphrsSpotPriceHistory'
--
-- * 'dsphrsResponseStatus'
describeSpotPriceHistoryResponse
    :: Int -- ^ 'dsphrsResponseStatus'
    -> DescribeSpotPriceHistoryResponse
describeSpotPriceHistoryResponse pResponseStatus_ =
    DescribeSpotPriceHistoryResponse'
    { _dsphrsNextToken = Nothing
    , _dsphrsSpotPriceHistory = Nothing
    , _dsphrsResponseStatus = pResponseStatus_
    }

-- | The token required to retrieve the next set of results. This value is
-- 'null' when there are no more results to return.
dsphrsNextToken :: Lens' DescribeSpotPriceHistoryResponse (Maybe Text)
dsphrsNextToken = lens _dsphrsNextToken (\ s a -> s{_dsphrsNextToken = a});

-- | The historical Spot Prices.
dsphrsSpotPriceHistory :: Lens' DescribeSpotPriceHistoryResponse [SpotPrice]
dsphrsSpotPriceHistory = lens _dsphrsSpotPriceHistory (\ s a -> s{_dsphrsSpotPriceHistory = a}) . _Default . _Coerce;

-- | The response status code.
dsphrsResponseStatus :: Lens' DescribeSpotPriceHistoryResponse Int
dsphrsResponseStatus = lens _dsphrsResponseStatus (\ s a -> s{_dsphrsResponseStatus = a});