{-# 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.EMR.ListInstanceGroups
-- Copyright   : (c) 2013-2023 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay
-- Stability   : auto-generated
-- Portability : non-portable (GHC extensions)
--
-- Provides all available details about the instance groups in a cluster.
--
-- This operation returns paginated results.
module Amazonka.EMR.ListInstanceGroups
  ( -- * Creating a Request
    ListInstanceGroups (..),
    newListInstanceGroups,

    -- * Request Lenses
    listInstanceGroups_marker,
    listInstanceGroups_clusterId,

    -- * Destructuring the Response
    ListInstanceGroupsResponse (..),
    newListInstanceGroupsResponse,

    -- * Response Lenses
    listInstanceGroupsResponse_instanceGroups,
    listInstanceGroupsResponse_marker,
    listInstanceGroupsResponse_httpStatus,
  )
where

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

-- | This input determines which instance groups to retrieve.
--
-- /See:/ 'newListInstanceGroups' smart constructor.
data ListInstanceGroups = ListInstanceGroups'
  { -- | The pagination token that indicates the next set of results to retrieve.
    marker :: Prelude.Maybe Prelude.Text,
    -- | The identifier of the cluster for which to list the instance groups.
    clusterId :: Prelude.Text
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'ListInstanceGroups' 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:
--
-- 'marker', 'listInstanceGroups_marker' - The pagination token that indicates the next set of results to retrieve.
--
-- 'clusterId', 'listInstanceGroups_clusterId' - The identifier of the cluster for which to list the instance groups.
newListInstanceGroups ::
  -- | 'clusterId'
  Prelude.Text ->
  ListInstanceGroups
newListInstanceGroups pClusterId_ =
  ListInstanceGroups'
    { marker = Prelude.Nothing,
      clusterId = pClusterId_
    }

-- | The pagination token that indicates the next set of results to retrieve.
listInstanceGroups_marker :: Lens.Lens' ListInstanceGroups (Prelude.Maybe Prelude.Text)
listInstanceGroups_marker = Lens.lens (\ListInstanceGroups' {marker} -> marker) (\s@ListInstanceGroups' {} a -> s {marker = a} :: ListInstanceGroups)

-- | The identifier of the cluster for which to list the instance groups.
listInstanceGroups_clusterId :: Lens.Lens' ListInstanceGroups Prelude.Text
listInstanceGroups_clusterId = Lens.lens (\ListInstanceGroups' {clusterId} -> clusterId) (\s@ListInstanceGroups' {} a -> s {clusterId = a} :: ListInstanceGroups)

instance Core.AWSPager ListInstanceGroups where
  page rq rs
    | Core.stop
        ( rs
            Lens.^? listInstanceGroupsResponse_marker
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Core.stop
        ( rs
            Lens.^? listInstanceGroupsResponse_instanceGroups
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Prelude.otherwise =
        Prelude.Just
          Prelude.$ rq
          Prelude.& listInstanceGroups_marker
          Lens..~ rs
          Lens.^? listInstanceGroupsResponse_marker
          Prelude.. Lens._Just

instance Core.AWSRequest ListInstanceGroups where
  type
    AWSResponse ListInstanceGroups =
      ListInstanceGroupsResponse
  request overrides =
    Request.postJSON (overrides defaultService)
  response =
    Response.receiveJSON
      ( \s h x ->
          ListInstanceGroupsResponse'
            Prelude.<$> (x Data..?> "InstanceGroups" Core..!@ Prelude.mempty)
            Prelude.<*> (x Data..?> "Marker")
            Prelude.<*> (Prelude.pure (Prelude.fromEnum s))
      )

instance Prelude.Hashable ListInstanceGroups where
  hashWithSalt _salt ListInstanceGroups' {..} =
    _salt
      `Prelude.hashWithSalt` marker
      `Prelude.hashWithSalt` clusterId

instance Prelude.NFData ListInstanceGroups where
  rnf ListInstanceGroups' {..} =
    Prelude.rnf marker
      `Prelude.seq` Prelude.rnf clusterId

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

instance Data.ToJSON ListInstanceGroups where
  toJSON ListInstanceGroups' {..} =
    Data.object
      ( Prelude.catMaybes
          [ ("Marker" Data..=) Prelude.<$> marker,
            Prelude.Just ("ClusterId" Data..= clusterId)
          ]
      )

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

instance Data.ToQuery ListInstanceGroups where
  toQuery = Prelude.const Prelude.mempty

-- | This input determines which instance groups to retrieve.
--
-- /See:/ 'newListInstanceGroupsResponse' smart constructor.
data ListInstanceGroupsResponse = ListInstanceGroupsResponse'
  { -- | The list of instance groups for the cluster and given filters.
    instanceGroups :: Prelude.Maybe [InstanceGroup],
    -- | The pagination token that indicates the next set of results to retrieve.
    marker :: 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 'ListInstanceGroupsResponse' 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:
--
-- 'instanceGroups', 'listInstanceGroupsResponse_instanceGroups' - The list of instance groups for the cluster and given filters.
--
-- 'marker', 'listInstanceGroupsResponse_marker' - The pagination token that indicates the next set of results to retrieve.
--
-- 'httpStatus', 'listInstanceGroupsResponse_httpStatus' - The response's http status code.
newListInstanceGroupsResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  ListInstanceGroupsResponse
newListInstanceGroupsResponse pHttpStatus_ =
  ListInstanceGroupsResponse'
    { instanceGroups =
        Prelude.Nothing,
      marker = Prelude.Nothing,
      httpStatus = pHttpStatus_
    }

-- | The list of instance groups for the cluster and given filters.
listInstanceGroupsResponse_instanceGroups :: Lens.Lens' ListInstanceGroupsResponse (Prelude.Maybe [InstanceGroup])
listInstanceGroupsResponse_instanceGroups = Lens.lens (\ListInstanceGroupsResponse' {instanceGroups} -> instanceGroups) (\s@ListInstanceGroupsResponse' {} a -> s {instanceGroups = a} :: ListInstanceGroupsResponse) Prelude.. Lens.mapping Lens.coerced

-- | The pagination token that indicates the next set of results to retrieve.
listInstanceGroupsResponse_marker :: Lens.Lens' ListInstanceGroupsResponse (Prelude.Maybe Prelude.Text)
listInstanceGroupsResponse_marker = Lens.lens (\ListInstanceGroupsResponse' {marker} -> marker) (\s@ListInstanceGroupsResponse' {} a -> s {marker = a} :: ListInstanceGroupsResponse)

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

instance Prelude.NFData ListInstanceGroupsResponse where
  rnf ListInstanceGroupsResponse' {..} =
    Prelude.rnf instanceGroups
      `Prelude.seq` Prelude.rnf marker
      `Prelude.seq` Prelude.rnf httpStatus