{-# 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.BackupGateway.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 backup gateways owned by an Amazon Web Services account in an
-- Amazon Web Services Region. The returned list is ordered by gateway
-- Amazon Resource Name (ARN).
--
-- This operation returns paginated results.
module Amazonka.BackupGateway.ListGateways
  ( -- * Creating a Request
    ListGateways (..),
    newListGateways,

    -- * Request Lenses
    listGateways_maxResults,
    listGateways_nextToken,

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

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

import Amazonka.BackupGateway.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:/ 'newListGateways' smart constructor.
data ListGateways = ListGateways'
  { -- | The maximum number of gateways to list.
    maxResults :: Prelude.Maybe Prelude.Natural,
    -- | The next item following a partial list of returned resources. For
    -- example, if a request is made to return @MaxResults@ number of
    -- resources, @NextToken@ allows you to return more items in your list
    -- starting at the location pointed to by the next token.
    nextToken :: 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:
--
-- 'maxResults', 'listGateways_maxResults' - The maximum number of gateways to list.
--
-- 'nextToken', 'listGateways_nextToken' - The next item following a partial list of returned resources. For
-- example, if a request is made to return @MaxResults@ number of
-- resources, @NextToken@ allows you to return more items in your list
-- starting at the location pointed to by the next token.
newListGateways ::
  ListGateways
newListGateways =
  ListGateways'
    { maxResults = Prelude.Nothing,
      nextToken = Prelude.Nothing
    }

-- | The maximum number of gateways to list.
listGateways_maxResults :: Lens.Lens' ListGateways (Prelude.Maybe Prelude.Natural)
listGateways_maxResults = Lens.lens (\ListGateways' {maxResults} -> maxResults) (\s@ListGateways' {} a -> s {maxResults = a} :: ListGateways)

-- | The next item following a partial list of returned resources. For
-- example, if a request is made to return @MaxResults@ number of
-- resources, @NextToken@ allows you to return more items in your list
-- starting at the location pointed to by the next token.
listGateways_nextToken :: Lens.Lens' ListGateways (Prelude.Maybe Prelude.Text)
listGateways_nextToken = Lens.lens (\ListGateways' {nextToken} -> nextToken) (\s@ListGateways' {} a -> s {nextToken = a} :: ListGateways)

instance Core.AWSPager ListGateways where
  page rq rs
    | Core.stop
        ( rs
            Lens.^? listGatewaysResponse_nextToken
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Core.stop
        ( rs
            Lens.^? listGatewaysResponse_gateways
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Prelude.otherwise =
        Prelude.Just
          Prelude.$ rq
          Prelude.& listGateways_nextToken
          Lens..~ rs
          Lens.^? listGatewaysResponse_nextToken
          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..?> "NextToken")
            Prelude.<*> (Prelude.pure (Prelude.fromEnum s))
      )

instance Prelude.Hashable ListGateways where
  hashWithSalt _salt ListGateways' {..} =
    _salt
      `Prelude.hashWithSalt` maxResults
      `Prelude.hashWithSalt` nextToken

instance Prelude.NFData ListGateways where
  rnf ListGateways' {..} =
    Prelude.rnf maxResults
      `Prelude.seq` Prelude.rnf nextToken

instance Data.ToHeaders ListGateways where
  toHeaders =
    Prelude.const
      ( Prelude.mconcat
          [ "X-Amz-Target"
              Data.=# ( "BackupOnPremises_v20210101.ListGateways" ::
                          Prelude.ByteString
                      ),
            "Content-Type"
              Data.=# ( "application/x-amz-json-1.0" ::
                          Prelude.ByteString
                      )
          ]
      )

instance Data.ToJSON ListGateways where
  toJSON ListGateways' {..} =
    Data.object
      ( Prelude.catMaybes
          [ ("MaxResults" Data..=) Prelude.<$> maxResults,
            ("NextToken" Data..=) Prelude.<$> nextToken
          ]
      )

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'
  { -- | A list of your gateways.
    gateways :: Prelude.Maybe [Gateway],
    -- | The next item following a partial list of returned resources. For
    -- example, if a request is made to return @maxResults@ number of
    -- resources, @NextToken@ allows you to return more items in your list
    -- starting at the location pointed to by the next token.
    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 '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' - A list of your gateways.
--
-- 'nextToken', 'listGatewaysResponse_nextToken' - The next item following a partial list of returned resources. For
-- example, if a request is made to return @maxResults@ number of
-- resources, @NextToken@ allows you to return more items in your list
-- starting at the location pointed to by the next token.
--
-- 'httpStatus', 'listGatewaysResponse_httpStatus' - The response's http status code.
newListGatewaysResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  ListGatewaysResponse
newListGatewaysResponse pHttpStatus_ =
  ListGatewaysResponse'
    { gateways = Prelude.Nothing,
      nextToken = Prelude.Nothing,
      httpStatus = pHttpStatus_
    }

-- | A list of your gateways.
listGatewaysResponse_gateways :: Lens.Lens' ListGatewaysResponse (Prelude.Maybe [Gateway])
listGatewaysResponse_gateways = Lens.lens (\ListGatewaysResponse' {gateways} -> gateways) (\s@ListGatewaysResponse' {} a -> s {gateways = a} :: ListGatewaysResponse) Prelude.. Lens.mapping Lens.coerced

-- | The next item following a partial list of returned resources. For
-- example, if a request is made to return @maxResults@ number of
-- resources, @NextToken@ allows you to return more items in your list
-- starting at the location pointed to by the next token.
listGatewaysResponse_nextToken :: Lens.Lens' ListGatewaysResponse (Prelude.Maybe Prelude.Text)
listGatewaysResponse_nextToken = Lens.lens (\ListGatewaysResponse' {nextToken} -> nextToken) (\s@ListGatewaysResponse' {} a -> s {nextToken = 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 nextToken
      `Prelude.seq` Prelude.rnf httpStatus