{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE DuplicateRecordFields #-}
{-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE StrictData #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# OPTIONS_GHC -fno-warn-unused-binds #-}
{-# OPTIONS_GHC -fno-warn-unused-imports #-}
{-# OPTIONS_GHC -fno-warn-unused-matches #-}

-- Derived from AWS service descriptions, licensed under Apache 2.0.

-- |
-- Module      : Amazonka.AutoScaling.DescribeAutoScalingInstances
-- Copyright   : (c) 2013-2023 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay
-- Stability   : auto-generated
-- Portability : non-portable (GHC extensions)
--
-- Gets information about the Auto Scaling instances in the account and
-- Region.
--
-- This operation returns paginated results.
module Amazonka.AutoScaling.DescribeAutoScalingInstances
  ( -- * Creating a Request
    DescribeAutoScalingInstances (..),
    newDescribeAutoScalingInstances,

    -- * Request Lenses
    describeAutoScalingInstances_instanceIds,
    describeAutoScalingInstances_maxRecords,
    describeAutoScalingInstances_nextToken,

    -- * Destructuring the Response
    DescribeAutoScalingInstancesResponse (..),
    newDescribeAutoScalingInstancesResponse,

    -- * Response Lenses
    describeAutoScalingInstancesResponse_autoScalingInstances,
    describeAutoScalingInstancesResponse_nextToken,
    describeAutoScalingInstancesResponse_httpStatus,
  )
where

import Amazonka.AutoScaling.Types
import qualified Amazonka.Core as Core
import qualified Amazonka.Core.Lens.Internal as Lens
import qualified Amazonka.Data as Data
import qualified Amazonka.Prelude as Prelude
import qualified Amazonka.Request as Request
import qualified Amazonka.Response as Response

-- | /See:/ 'newDescribeAutoScalingInstances' smart constructor.
data DescribeAutoScalingInstances = DescribeAutoScalingInstances'
  { -- | The IDs of the instances. If you omit this property, all Auto Scaling
    -- instances are described. If you specify an ID that does not exist, it is
    -- ignored with no error.
    --
    -- Array Members: Maximum number of 50 items.
    instanceIds :: Prelude.Maybe [Prelude.Text],
    -- | The maximum number of items to return with this call. The default value
    -- is @50@ and the maximum value is @50@.
    maxRecords :: Prelude.Maybe Prelude.Int,
    -- | The token for the next set of items to return. (You received this token
    -- from a previous call.)
    nextToken :: Prelude.Maybe Prelude.Text
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'DescribeAutoScalingInstances' with all optional fields omitted.
--
-- Use <https://hackage.haskell.org/package/generic-lens generic-lens> or <https://hackage.haskell.org/package/optics optics> to modify other optional fields.
--
-- The following record fields are available, with the corresponding lenses provided
-- for backwards compatibility:
--
-- 'instanceIds', 'describeAutoScalingInstances_instanceIds' - The IDs of the instances. If you omit this property, all Auto Scaling
-- instances are described. If you specify an ID that does not exist, it is
-- ignored with no error.
--
-- Array Members: Maximum number of 50 items.
--
-- 'maxRecords', 'describeAutoScalingInstances_maxRecords' - The maximum number of items to return with this call. The default value
-- is @50@ and the maximum value is @50@.
--
-- 'nextToken', 'describeAutoScalingInstances_nextToken' - The token for the next set of items to return. (You received this token
-- from a previous call.)
newDescribeAutoScalingInstances ::
  DescribeAutoScalingInstances
newDescribeAutoScalingInstances =
  DescribeAutoScalingInstances'
    { instanceIds =
        Prelude.Nothing,
      maxRecords = Prelude.Nothing,
      nextToken = Prelude.Nothing
    }

-- | The IDs of the instances. If you omit this property, all Auto Scaling
-- instances are described. If you specify an ID that does not exist, it is
-- ignored with no error.
--
-- Array Members: Maximum number of 50 items.
describeAutoScalingInstances_instanceIds :: Lens.Lens' DescribeAutoScalingInstances (Prelude.Maybe [Prelude.Text])
describeAutoScalingInstances_instanceIds = Lens.lens (\DescribeAutoScalingInstances' {instanceIds} -> instanceIds) (\s@DescribeAutoScalingInstances' {} a -> s {instanceIds = a} :: DescribeAutoScalingInstances) Prelude.. Lens.mapping Lens.coerced

-- | The maximum number of items to return with this call. The default value
-- is @50@ and the maximum value is @50@.
describeAutoScalingInstances_maxRecords :: Lens.Lens' DescribeAutoScalingInstances (Prelude.Maybe Prelude.Int)
describeAutoScalingInstances_maxRecords = Lens.lens (\DescribeAutoScalingInstances' {maxRecords} -> maxRecords) (\s@DescribeAutoScalingInstances' {} a -> s {maxRecords = a} :: DescribeAutoScalingInstances)

-- | The token for the next set of items to return. (You received this token
-- from a previous call.)
describeAutoScalingInstances_nextToken :: Lens.Lens' DescribeAutoScalingInstances (Prelude.Maybe Prelude.Text)
describeAutoScalingInstances_nextToken = Lens.lens (\DescribeAutoScalingInstances' {nextToken} -> nextToken) (\s@DescribeAutoScalingInstances' {} a -> s {nextToken = a} :: DescribeAutoScalingInstances)

instance Core.AWSPager DescribeAutoScalingInstances where
  page rq rs
    | Core.stop
        ( rs
            Lens.^? describeAutoScalingInstancesResponse_nextToken
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Core.stop
        ( rs
            Lens.^? describeAutoScalingInstancesResponse_autoScalingInstances
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Prelude.otherwise =
        Prelude.Just
          Prelude.$ rq
          Prelude.& describeAutoScalingInstances_nextToken
          Lens..~ rs
          Lens.^? describeAutoScalingInstancesResponse_nextToken
          Prelude.. Lens._Just

instance Core.AWSRequest DescribeAutoScalingInstances where
  type
    AWSResponse DescribeAutoScalingInstances =
      DescribeAutoScalingInstancesResponse
  request overrides =
    Request.postQuery (overrides defaultService)
  response =
    Response.receiveXMLWrapper
      "DescribeAutoScalingInstancesResult"
      ( \s h x ->
          DescribeAutoScalingInstancesResponse'
            Prelude.<$> ( x
                            Data..@? "AutoScalingInstances"
                            Core..!@ Prelude.mempty
                            Prelude.>>= Core.may (Data.parseXMLList "member")
                        )
            Prelude.<*> (x Data..@? "NextToken")
            Prelude.<*> (Prelude.pure (Prelude.fromEnum s))
      )

instance
  Prelude.Hashable
    DescribeAutoScalingInstances
  where
  hashWithSalt _salt DescribeAutoScalingInstances' {..} =
    _salt
      `Prelude.hashWithSalt` instanceIds
      `Prelude.hashWithSalt` maxRecords
      `Prelude.hashWithSalt` nextToken

instance Prelude.NFData DescribeAutoScalingInstances where
  rnf DescribeAutoScalingInstances' {..} =
    Prelude.rnf instanceIds
      `Prelude.seq` Prelude.rnf maxRecords
      `Prelude.seq` Prelude.rnf nextToken

instance Data.ToHeaders DescribeAutoScalingInstances where
  toHeaders = Prelude.const Prelude.mempty

instance Data.ToPath DescribeAutoScalingInstances where
  toPath = Prelude.const "/"

instance Data.ToQuery DescribeAutoScalingInstances where
  toQuery DescribeAutoScalingInstances' {..} =
    Prelude.mconcat
      [ "Action"
          Data.=: ( "DescribeAutoScalingInstances" ::
                      Prelude.ByteString
                  ),
        "Version"
          Data.=: ("2011-01-01" :: Prelude.ByteString),
        "InstanceIds"
          Data.=: Data.toQuery
            (Data.toQueryList "member" Prelude.<$> instanceIds),
        "MaxRecords" Data.=: maxRecords,
        "NextToken" Data.=: nextToken
      ]

-- | /See:/ 'newDescribeAutoScalingInstancesResponse' smart constructor.
data DescribeAutoScalingInstancesResponse = DescribeAutoScalingInstancesResponse'
  { -- | The instances.
    autoScalingInstances :: Prelude.Maybe [AutoScalingInstanceDetails],
    -- | A string that indicates that the response contains more items than can
    -- be returned in a single response. To receive additional items, specify
    -- this string for the @NextToken@ value when requesting the next set of
    -- items. This value is null when there are no more items to return.
    nextToken :: Prelude.Maybe Prelude.Text,
    -- | The response's http status code.
    httpStatus :: Prelude.Int
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'DescribeAutoScalingInstancesResponse' with all optional fields omitted.
--
-- Use <https://hackage.haskell.org/package/generic-lens generic-lens> or <https://hackage.haskell.org/package/optics optics> to modify other optional fields.
--
-- The following record fields are available, with the corresponding lenses provided
-- for backwards compatibility:
--
-- 'autoScalingInstances', 'describeAutoScalingInstancesResponse_autoScalingInstances' - The instances.
--
-- 'nextToken', 'describeAutoScalingInstancesResponse_nextToken' - A string that indicates that the response contains more items than can
-- be returned in a single response. To receive additional items, specify
-- this string for the @NextToken@ value when requesting the next set of
-- items. This value is null when there are no more items to return.
--
-- 'httpStatus', 'describeAutoScalingInstancesResponse_httpStatus' - The response's http status code.
newDescribeAutoScalingInstancesResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  DescribeAutoScalingInstancesResponse
newDescribeAutoScalingInstancesResponse pHttpStatus_ =
  DescribeAutoScalingInstancesResponse'
    { autoScalingInstances =
        Prelude.Nothing,
      nextToken = Prelude.Nothing,
      httpStatus = pHttpStatus_
    }

-- | The instances.
describeAutoScalingInstancesResponse_autoScalingInstances :: Lens.Lens' DescribeAutoScalingInstancesResponse (Prelude.Maybe [AutoScalingInstanceDetails])
describeAutoScalingInstancesResponse_autoScalingInstances = Lens.lens (\DescribeAutoScalingInstancesResponse' {autoScalingInstances} -> autoScalingInstances) (\s@DescribeAutoScalingInstancesResponse' {} a -> s {autoScalingInstances = a} :: DescribeAutoScalingInstancesResponse) Prelude.. Lens.mapping Lens.coerced

-- | A string that indicates that the response contains more items than can
-- be returned in a single response. To receive additional items, specify
-- this string for the @NextToken@ value when requesting the next set of
-- items. This value is null when there are no more items to return.
describeAutoScalingInstancesResponse_nextToken :: Lens.Lens' DescribeAutoScalingInstancesResponse (Prelude.Maybe Prelude.Text)
describeAutoScalingInstancesResponse_nextToken = Lens.lens (\DescribeAutoScalingInstancesResponse' {nextToken} -> nextToken) (\s@DescribeAutoScalingInstancesResponse' {} a -> s {nextToken = a} :: DescribeAutoScalingInstancesResponse)

-- | The response's http status code.
describeAutoScalingInstancesResponse_httpStatus :: Lens.Lens' DescribeAutoScalingInstancesResponse Prelude.Int
describeAutoScalingInstancesResponse_httpStatus = Lens.lens (\DescribeAutoScalingInstancesResponse' {httpStatus} -> httpStatus) (\s@DescribeAutoScalingInstancesResponse' {} a -> s {httpStatus = a} :: DescribeAutoScalingInstancesResponse)

instance
  Prelude.NFData
    DescribeAutoScalingInstancesResponse
  where
  rnf DescribeAutoScalingInstancesResponse' {..} =
    Prelude.rnf autoScalingInstances
      `Prelude.seq` Prelude.rnf nextToken
      `Prelude.seq` Prelude.rnf httpStatus