{-# 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.ListInstances
-- 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 information for all active EC2 instances and EC2 instances
-- terminated in the last 30 days, up to a maximum of 2,000. EC2 instances
-- in any of the following states are considered active:
-- AWAITING_FULFILLMENT, PROVISIONING, BOOTSTRAPPING, RUNNING.
--
-- This operation returns paginated results.
module Amazonka.EMR.ListInstances
  ( -- * Creating a Request
    ListInstances (..),
    newListInstances,

    -- * Request Lenses
    listInstances_instanceFleetId,
    listInstances_instanceFleetType,
    listInstances_instanceGroupId,
    listInstances_instanceGroupTypes,
    listInstances_instanceStates,
    listInstances_marker,
    listInstances_clusterId,

    -- * Destructuring the Response
    ListInstancesResponse (..),
    newListInstancesResponse,

    -- * Response Lenses
    listInstancesResponse_instances,
    listInstancesResponse_marker,
    listInstancesResponse_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 instances to list.
--
-- /See:/ 'newListInstances' smart constructor.
data ListInstances = ListInstances'
  { -- | The unique identifier of the instance fleet.
    instanceFleetId :: Prelude.Maybe Prelude.Text,
    -- | The node type of the instance fleet. For example MASTER, CORE, or TASK.
    instanceFleetType :: Prelude.Maybe InstanceFleetType,
    -- | The identifier of the instance group for which to list the instances.
    instanceGroupId :: Prelude.Maybe Prelude.Text,
    -- | The type of instance group for which to list the instances.
    instanceGroupTypes :: Prelude.Maybe [InstanceGroupType],
    -- | A list of instance states that will filter the instances returned with
    -- this request.
    instanceStates :: Prelude.Maybe [InstanceState],
    -- | 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 instances.
    clusterId :: Prelude.Text
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'ListInstances' 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:
--
-- 'instanceFleetId', 'listInstances_instanceFleetId' - The unique identifier of the instance fleet.
--
-- 'instanceFleetType', 'listInstances_instanceFleetType' - The node type of the instance fleet. For example MASTER, CORE, or TASK.
--
-- 'instanceGroupId', 'listInstances_instanceGroupId' - The identifier of the instance group for which to list the instances.
--
-- 'instanceGroupTypes', 'listInstances_instanceGroupTypes' - The type of instance group for which to list the instances.
--
-- 'instanceStates', 'listInstances_instanceStates' - A list of instance states that will filter the instances returned with
-- this request.
--
-- 'marker', 'listInstances_marker' - The pagination token that indicates the next set of results to retrieve.
--
-- 'clusterId', 'listInstances_clusterId' - The identifier of the cluster for which to list the instances.
newListInstances ::
  -- | 'clusterId'
  Prelude.Text ->
  ListInstances
newListInstances pClusterId_ =
  ListInstances'
    { instanceFleetId = Prelude.Nothing,
      instanceFleetType = Prelude.Nothing,
      instanceGroupId = Prelude.Nothing,
      instanceGroupTypes = Prelude.Nothing,
      instanceStates = Prelude.Nothing,
      marker = Prelude.Nothing,
      clusterId = pClusterId_
    }

-- | The unique identifier of the instance fleet.
listInstances_instanceFleetId :: Lens.Lens' ListInstances (Prelude.Maybe Prelude.Text)
listInstances_instanceFleetId = Lens.lens (\ListInstances' {instanceFleetId} -> instanceFleetId) (\s@ListInstances' {} a -> s {instanceFleetId = a} :: ListInstances)

-- | The node type of the instance fleet. For example MASTER, CORE, or TASK.
listInstances_instanceFleetType :: Lens.Lens' ListInstances (Prelude.Maybe InstanceFleetType)
listInstances_instanceFleetType = Lens.lens (\ListInstances' {instanceFleetType} -> instanceFleetType) (\s@ListInstances' {} a -> s {instanceFleetType = a} :: ListInstances)

-- | The identifier of the instance group for which to list the instances.
listInstances_instanceGroupId :: Lens.Lens' ListInstances (Prelude.Maybe Prelude.Text)
listInstances_instanceGroupId = Lens.lens (\ListInstances' {instanceGroupId} -> instanceGroupId) (\s@ListInstances' {} a -> s {instanceGroupId = a} :: ListInstances)

-- | The type of instance group for which to list the instances.
listInstances_instanceGroupTypes :: Lens.Lens' ListInstances (Prelude.Maybe [InstanceGroupType])
listInstances_instanceGroupTypes = Lens.lens (\ListInstances' {instanceGroupTypes} -> instanceGroupTypes) (\s@ListInstances' {} a -> s {instanceGroupTypes = a} :: ListInstances) Prelude.. Lens.mapping Lens.coerced

-- | A list of instance states that will filter the instances returned with
-- this request.
listInstances_instanceStates :: Lens.Lens' ListInstances (Prelude.Maybe [InstanceState])
listInstances_instanceStates = Lens.lens (\ListInstances' {instanceStates} -> instanceStates) (\s@ListInstances' {} a -> s {instanceStates = a} :: ListInstances) Prelude.. Lens.mapping Lens.coerced

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

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

instance Core.AWSPager ListInstances where
  page rq rs
    | Core.stop
        ( rs
            Lens.^? listInstancesResponse_marker
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Core.stop
        ( rs
            Lens.^? listInstancesResponse_instances
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Prelude.otherwise =
        Prelude.Just
          Prelude.$ rq
          Prelude.& listInstances_marker
          Lens..~ rs
          Lens.^? listInstancesResponse_marker
          Prelude.. Lens._Just

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

instance Prelude.Hashable ListInstances where
  hashWithSalt _salt ListInstances' {..} =
    _salt
      `Prelude.hashWithSalt` instanceFleetId
      `Prelude.hashWithSalt` instanceFleetType
      `Prelude.hashWithSalt` instanceGroupId
      `Prelude.hashWithSalt` instanceGroupTypes
      `Prelude.hashWithSalt` instanceStates
      `Prelude.hashWithSalt` marker
      `Prelude.hashWithSalt` clusterId

instance Prelude.NFData ListInstances where
  rnf ListInstances' {..} =
    Prelude.rnf instanceFleetId
      `Prelude.seq` Prelude.rnf instanceFleetType
      `Prelude.seq` Prelude.rnf instanceGroupId
      `Prelude.seq` Prelude.rnf instanceGroupTypes
      `Prelude.seq` Prelude.rnf instanceStates
      `Prelude.seq` Prelude.rnf marker
      `Prelude.seq` Prelude.rnf clusterId

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

instance Data.ToJSON ListInstances where
  toJSON ListInstances' {..} =
    Data.object
      ( Prelude.catMaybes
          [ ("InstanceFleetId" Data..=)
              Prelude.<$> instanceFleetId,
            ("InstanceFleetType" Data..=)
              Prelude.<$> instanceFleetType,
            ("InstanceGroupId" Data..=)
              Prelude.<$> instanceGroupId,
            ("InstanceGroupTypes" Data..=)
              Prelude.<$> instanceGroupTypes,
            ("InstanceStates" Data..=)
              Prelude.<$> instanceStates,
            ("Marker" Data..=) Prelude.<$> marker,
            Prelude.Just ("ClusterId" Data..= clusterId)
          ]
      )

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

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

-- | This output contains the list of instances.
--
-- /See:/ 'newListInstancesResponse' smart constructor.
data ListInstancesResponse = ListInstancesResponse'
  { -- | The list of instances for the cluster and given filters.
    instances :: Prelude.Maybe [Instance],
    -- | 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 'ListInstancesResponse' 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:
--
-- 'instances', 'listInstancesResponse_instances' - The list of instances for the cluster and given filters.
--
-- 'marker', 'listInstancesResponse_marker' - The pagination token that indicates the next set of results to retrieve.
--
-- 'httpStatus', 'listInstancesResponse_httpStatus' - The response's http status code.
newListInstancesResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  ListInstancesResponse
newListInstancesResponse pHttpStatus_ =
  ListInstancesResponse'
    { instances = Prelude.Nothing,
      marker = Prelude.Nothing,
      httpStatus = pHttpStatus_
    }

-- | The list of instances for the cluster and given filters.
listInstancesResponse_instances :: Lens.Lens' ListInstancesResponse (Prelude.Maybe [Instance])
listInstancesResponse_instances = Lens.lens (\ListInstancesResponse' {instances} -> instances) (\s@ListInstancesResponse' {} a -> s {instances = a} :: ListInstancesResponse) Prelude.. Lens.mapping Lens.coerced

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

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

instance Prelude.NFData ListInstancesResponse where
  rnf ListInstancesResponse' {..} =
    Prelude.rnf instances
      `Prelude.seq` Prelude.rnf marker
      `Prelude.seq` Prelude.rnf httpStatus