{-# 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.OpsWorks.DescribeInstances
-- Copyright   : (c) 2013-2023 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay
-- Stability   : auto-generated
-- Portability : non-portable (GHC extensions)
--
-- Requests a description of a set of instances.
--
-- This call accepts only one resource-identifying parameter.
--
-- __Required Permissions__: To use this action, an IAM user must have a
-- Show, Deploy, or Manage permissions level for the stack, or an attached
-- policy that explicitly grants permissions. For more information about
-- user permissions, see
-- <https://docs.aws.amazon.com/opsworks/latest/userguide/opsworks-security-users.html Managing User Permissions>.
module Amazonka.OpsWorks.DescribeInstances
  ( -- * Creating a Request
    DescribeInstances (..),
    newDescribeInstances,

    -- * Request Lenses
    describeInstances_instanceIds,
    describeInstances_layerId,
    describeInstances_stackId,

    -- * Destructuring the Response
    DescribeInstancesResponse (..),
    newDescribeInstancesResponse,

    -- * Response Lenses
    describeInstancesResponse_instances,
    describeInstancesResponse_httpStatus,
  )
where

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

-- | /See:/ 'newDescribeInstances' smart constructor.
data DescribeInstances = DescribeInstances'
  { -- | An array of instance IDs to be described. If you use this parameter,
    -- @DescribeInstances@ returns a description of the specified instances.
    -- Otherwise, it returns a description of every instance.
    instanceIds :: Prelude.Maybe [Prelude.Text],
    -- | A layer ID. If you use this parameter, @DescribeInstances@ returns
    -- descriptions of the instances associated with the specified layer.
    layerId :: Prelude.Maybe Prelude.Text,
    -- | A stack ID. If you use this parameter, @DescribeInstances@ returns
    -- descriptions of the instances associated with the specified stack.
    stackId :: Prelude.Maybe Prelude.Text
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'DescribeInstances' 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', 'describeInstances_instanceIds' - An array of instance IDs to be described. If you use this parameter,
-- @DescribeInstances@ returns a description of the specified instances.
-- Otherwise, it returns a description of every instance.
--
-- 'layerId', 'describeInstances_layerId' - A layer ID. If you use this parameter, @DescribeInstances@ returns
-- descriptions of the instances associated with the specified layer.
--
-- 'stackId', 'describeInstances_stackId' - A stack ID. If you use this parameter, @DescribeInstances@ returns
-- descriptions of the instances associated with the specified stack.
newDescribeInstances ::
  DescribeInstances
newDescribeInstances =
  DescribeInstances'
    { instanceIds = Prelude.Nothing,
      layerId = Prelude.Nothing,
      stackId = Prelude.Nothing
    }

-- | An array of instance IDs to be described. If you use this parameter,
-- @DescribeInstances@ returns a description of the specified instances.
-- Otherwise, it returns a description of every instance.
describeInstances_instanceIds :: Lens.Lens' DescribeInstances (Prelude.Maybe [Prelude.Text])
describeInstances_instanceIds = Lens.lens (\DescribeInstances' {instanceIds} -> instanceIds) (\s@DescribeInstances' {} a -> s {instanceIds = a} :: DescribeInstances) Prelude.. Lens.mapping Lens.coerced

-- | A layer ID. If you use this parameter, @DescribeInstances@ returns
-- descriptions of the instances associated with the specified layer.
describeInstances_layerId :: Lens.Lens' DescribeInstances (Prelude.Maybe Prelude.Text)
describeInstances_layerId = Lens.lens (\DescribeInstances' {layerId} -> layerId) (\s@DescribeInstances' {} a -> s {layerId = a} :: DescribeInstances)

-- | A stack ID. If you use this parameter, @DescribeInstances@ returns
-- descriptions of the instances associated with the specified stack.
describeInstances_stackId :: Lens.Lens' DescribeInstances (Prelude.Maybe Prelude.Text)
describeInstances_stackId = Lens.lens (\DescribeInstances' {stackId} -> stackId) (\s@DescribeInstances' {} a -> s {stackId = a} :: DescribeInstances)

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

instance Prelude.Hashable DescribeInstances where
  hashWithSalt _salt DescribeInstances' {..} =
    _salt
      `Prelude.hashWithSalt` instanceIds
      `Prelude.hashWithSalt` layerId
      `Prelude.hashWithSalt` stackId

instance Prelude.NFData DescribeInstances where
  rnf DescribeInstances' {..} =
    Prelude.rnf instanceIds
      `Prelude.seq` Prelude.rnf layerId
      `Prelude.seq` Prelude.rnf stackId

instance Data.ToHeaders DescribeInstances where
  toHeaders =
    Prelude.const
      ( Prelude.mconcat
          [ "X-Amz-Target"
              Data.=# ( "OpsWorks_20130218.DescribeInstances" ::
                          Prelude.ByteString
                      ),
            "Content-Type"
              Data.=# ( "application/x-amz-json-1.1" ::
                          Prelude.ByteString
                      )
          ]
      )

instance Data.ToJSON DescribeInstances where
  toJSON DescribeInstances' {..} =
    Data.object
      ( Prelude.catMaybes
          [ ("InstanceIds" Data..=) Prelude.<$> instanceIds,
            ("LayerId" Data..=) Prelude.<$> layerId,
            ("StackId" Data..=) Prelude.<$> stackId
          ]
      )

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

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

-- | Contains the response to a @DescribeInstances@ request.
--
-- /See:/ 'newDescribeInstancesResponse' smart constructor.
data DescribeInstancesResponse = DescribeInstancesResponse'
  { -- | An array of @Instance@ objects that describe the instances.
    instances :: Prelude.Maybe [Instance],
    -- | The response's http status code.
    httpStatus :: Prelude.Int
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'DescribeInstancesResponse' 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', 'describeInstancesResponse_instances' - An array of @Instance@ objects that describe the instances.
--
-- 'httpStatus', 'describeInstancesResponse_httpStatus' - The response's http status code.
newDescribeInstancesResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  DescribeInstancesResponse
newDescribeInstancesResponse pHttpStatus_ =
  DescribeInstancesResponse'
    { instances =
        Prelude.Nothing,
      httpStatus = pHttpStatus_
    }

-- | An array of @Instance@ objects that describe the instances.
describeInstancesResponse_instances :: Lens.Lens' DescribeInstancesResponse (Prelude.Maybe [Instance])
describeInstancesResponse_instances = Lens.lens (\DescribeInstancesResponse' {instances} -> instances) (\s@DescribeInstancesResponse' {} a -> s {instances = a} :: DescribeInstancesResponse) Prelude.. Lens.mapping Lens.coerced

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

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