{-# 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.StorageGateway.ListGateways
-- Copyright   : (c) 2013-2023 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay
-- Stability   : auto-generated
-- Portability : non-portable (GHC extensions)
--
-- Lists gateways owned by an Amazon Web Services account in an Amazon Web
-- Services Region specified in the request. The returned list is ordered
-- by gateway Amazon Resource Name (ARN).
--
-- By default, the operation returns a maximum of 100 gateways. This
-- operation supports pagination that allows you to optionally reduce the
-- number of gateways returned in a response.
--
-- If you have more gateways than are returned in a response (that is, the
-- response returns only a truncated list of your gateways), the response
-- contains a marker that you can specify in your next request to fetch the
-- next page of gateways.
--
-- This operation returns paginated results.
module Amazonka.StorageGateway.ListGateways
  ( -- * Creating a Request
    ListGateways (..),
    newListGateways,

    -- * Request Lenses
    listGateways_limit,
    listGateways_marker,

    -- * Destructuring the Response
    ListGatewaysResponse (..),
    newListGatewaysResponse,

    -- * Response Lenses
    listGatewaysResponse_gateways,
    listGatewaysResponse_marker,
    listGatewaysResponse_httpStatus,
  )
where

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
import Amazonka.StorageGateway.Types

-- | A JSON object containing zero or more of the following fields:
--
-- -   ListGatewaysInput$Limit
--
-- -   ListGatewaysInput$Marker
--
-- /See:/ 'newListGateways' smart constructor.
data ListGateways = ListGateways'
  { -- | Specifies that the list of gateways returned be limited to the specified
    -- number of items.
    limit :: Prelude.Maybe Prelude.Natural,
    -- | An opaque string that indicates the position at which to begin the
    -- returned list of gateways.
    marker :: Prelude.Maybe Prelude.Text
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'ListGateways' 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:
--
-- 'limit', 'listGateways_limit' - Specifies that the list of gateways returned be limited to the specified
-- number of items.
--
-- 'marker', 'listGateways_marker' - An opaque string that indicates the position at which to begin the
-- returned list of gateways.
newListGateways ::
  ListGateways
newListGateways =
  ListGateways'
    { limit = Prelude.Nothing,
      marker = Prelude.Nothing
    }

-- | Specifies that the list of gateways returned be limited to the specified
-- number of items.
listGateways_limit :: Lens.Lens' ListGateways (Prelude.Maybe Prelude.Natural)
listGateways_limit = Lens.lens (\ListGateways' {limit} -> limit) (\s@ListGateways' {} a -> s {limit = a} :: ListGateways)

-- | An opaque string that indicates the position at which to begin the
-- returned list of gateways.
listGateways_marker :: Lens.Lens' ListGateways (Prelude.Maybe Prelude.Text)
listGateways_marker = Lens.lens (\ListGateways' {marker} -> marker) (\s@ListGateways' {} a -> s {marker = a} :: ListGateways)

instance Core.AWSPager ListGateways where
  page rq rs
    | Core.stop
        ( rs
            Lens.^? listGatewaysResponse_marker
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Core.stop
        ( rs
            Lens.^? listGatewaysResponse_gateways
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Prelude.otherwise =
        Prelude.Just
          Prelude.$ rq
          Prelude.& listGateways_marker
          Lens..~ rs
          Lens.^? listGatewaysResponse_marker
          Prelude.. Lens._Just

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

instance Prelude.Hashable ListGateways where
  hashWithSalt _salt ListGateways' {..} =
    _salt
      `Prelude.hashWithSalt` limit
      `Prelude.hashWithSalt` marker

instance Prelude.NFData ListGateways where
  rnf ListGateways' {..} =
    Prelude.rnf limit `Prelude.seq` Prelude.rnf marker

instance Data.ToHeaders ListGateways where
  toHeaders =
    Prelude.const
      ( Prelude.mconcat
          [ "X-Amz-Target"
              Data.=# ( "StorageGateway_20130630.ListGateways" ::
                          Prelude.ByteString
                      ),
            "Content-Type"
              Data.=# ( "application/x-amz-json-1.1" ::
                          Prelude.ByteString
                      )
          ]
      )

instance Data.ToJSON ListGateways where
  toJSON ListGateways' {..} =
    Data.object
      ( Prelude.catMaybes
          [ ("Limit" Data..=) Prelude.<$> limit,
            ("Marker" Data..=) Prelude.<$> marker
          ]
      )

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

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

-- | /See:/ 'newListGatewaysResponse' smart constructor.
data ListGatewaysResponse = ListGatewaysResponse'
  { -- | An array of GatewayInfo objects.
    gateways :: Prelude.Maybe [GatewayInfo],
    -- | Use the marker in your next request to fetch the next set of gateways in
    -- the list. If there are no more gateways to list, this field does not
    -- appear in the response.
    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 'ListGatewaysResponse' 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:
--
-- 'gateways', 'listGatewaysResponse_gateways' - An array of GatewayInfo objects.
--
-- 'marker', 'listGatewaysResponse_marker' - Use the marker in your next request to fetch the next set of gateways in
-- the list. If there are no more gateways to list, this field does not
-- appear in the response.
--
-- 'httpStatus', 'listGatewaysResponse_httpStatus' - The response's http status code.
newListGatewaysResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  ListGatewaysResponse
newListGatewaysResponse pHttpStatus_ =
  ListGatewaysResponse'
    { gateways = Prelude.Nothing,
      marker = Prelude.Nothing,
      httpStatus = pHttpStatus_
    }

-- | An array of GatewayInfo objects.
listGatewaysResponse_gateways :: Lens.Lens' ListGatewaysResponse (Prelude.Maybe [GatewayInfo])
listGatewaysResponse_gateways = Lens.lens (\ListGatewaysResponse' {gateways} -> gateways) (\s@ListGatewaysResponse' {} a -> s {gateways = a} :: ListGatewaysResponse) Prelude.. Lens.mapping Lens.coerced

-- | Use the marker in your next request to fetch the next set of gateways in
-- the list. If there are no more gateways to list, this field does not
-- appear in the response.
listGatewaysResponse_marker :: Lens.Lens' ListGatewaysResponse (Prelude.Maybe Prelude.Text)
listGatewaysResponse_marker = Lens.lens (\ListGatewaysResponse' {marker} -> marker) (\s@ListGatewaysResponse' {} a -> s {marker = a} :: ListGatewaysResponse)

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

instance Prelude.NFData ListGatewaysResponse where
  rnf ListGatewaysResponse' {..} =
    Prelude.rnf gateways
      `Prelude.seq` Prelude.rnf marker
      `Prelude.seq` Prelude.rnf httpStatus