{-# 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.ResourceGroupsTagging.GetTagKeys
-- Copyright   : (c) 2013-2023 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay
-- Stability   : auto-generated
-- Portability : non-portable (GHC extensions)
--
-- Returns all tag keys currently in use in the specified Amazon Web
-- Services Region for the calling account.
--
-- This operation supports pagination, where the response can be sent in
-- multiple pages. You should check the @PaginationToken@ response
-- parameter to determine if there are additional results available to
-- return. Repeat the query, passing the @PaginationToken@ response
-- parameter value as an input to the next request until you recieve a
-- @null@ value. A null value for @PaginationToken@ indicates that there
-- are no more results waiting to be returned.
--
-- This operation returns paginated results.
module Amazonka.ResourceGroupsTagging.GetTagKeys
  ( -- * Creating a Request
    GetTagKeys (..),
    newGetTagKeys,

    -- * Request Lenses
    getTagKeys_paginationToken,

    -- * Destructuring the Response
    GetTagKeysResponse (..),
    newGetTagKeysResponse,

    -- * Response Lenses
    getTagKeysResponse_paginationToken,
    getTagKeysResponse_tagKeys,
    getTagKeysResponse_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 Amazonka.ResourceGroupsTagging.Types
import qualified Amazonka.Response as Response

-- | /See:/ 'newGetTagKeys' smart constructor.
data GetTagKeys = GetTagKeys'
  { -- | Specifies a @PaginationToken@ response value from a previous request to
    -- indicate that you want the next page of results. Leave this parameter
    -- empty in your initial request.
    paginationToken :: Prelude.Maybe Prelude.Text
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'GetTagKeys' 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:
--
-- 'paginationToken', 'getTagKeys_paginationToken' - Specifies a @PaginationToken@ response value from a previous request to
-- indicate that you want the next page of results. Leave this parameter
-- empty in your initial request.
newGetTagKeys ::
  GetTagKeys
newGetTagKeys =
  GetTagKeys' {paginationToken = Prelude.Nothing}

-- | Specifies a @PaginationToken@ response value from a previous request to
-- indicate that you want the next page of results. Leave this parameter
-- empty in your initial request.
getTagKeys_paginationToken :: Lens.Lens' GetTagKeys (Prelude.Maybe Prelude.Text)
getTagKeys_paginationToken = Lens.lens (\GetTagKeys' {paginationToken} -> paginationToken) (\s@GetTagKeys' {} a -> s {paginationToken = a} :: GetTagKeys)

instance Core.AWSPager GetTagKeys where
  page rq rs
    | Core.stop
        ( rs
            Lens.^? getTagKeysResponse_paginationToken
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Core.stop
        ( rs
            Lens.^? getTagKeysResponse_tagKeys
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Prelude.otherwise =
        Prelude.Just
          Prelude.$ rq
          Prelude.& getTagKeys_paginationToken
          Lens..~ rs
          Lens.^? getTagKeysResponse_paginationToken
          Prelude.. Lens._Just

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

instance Prelude.Hashable GetTagKeys where
  hashWithSalt _salt GetTagKeys' {..} =
    _salt `Prelude.hashWithSalt` paginationToken

instance Prelude.NFData GetTagKeys where
  rnf GetTagKeys' {..} = Prelude.rnf paginationToken

instance Data.ToHeaders GetTagKeys where
  toHeaders =
    Prelude.const
      ( Prelude.mconcat
          [ "X-Amz-Target"
              Data.=# ( "ResourceGroupsTaggingAPI_20170126.GetTagKeys" ::
                          Prelude.ByteString
                      ),
            "Content-Type"
              Data.=# ( "application/x-amz-json-1.1" ::
                          Prelude.ByteString
                      )
          ]
      )

instance Data.ToJSON GetTagKeys where
  toJSON GetTagKeys' {..} =
    Data.object
      ( Prelude.catMaybes
          [ ("PaginationToken" Data..=)
              Prelude.<$> paginationToken
          ]
      )

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

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

-- | /See:/ 'newGetTagKeysResponse' smart constructor.
data GetTagKeysResponse = GetTagKeysResponse'
  { -- | A string that indicates that there is more data available than this
    -- response contains. To receive the next part of the response, specify
    -- this response value as the @PaginationToken@ value in the request for
    -- the next page.
    paginationToken :: Prelude.Maybe Prelude.Text,
    -- | A list of all tag keys in the Amazon Web Services account.
    tagKeys :: 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 'GetTagKeysResponse' 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:
--
-- 'paginationToken', 'getTagKeysResponse_paginationToken' - A string that indicates that there is more data available than this
-- response contains. To receive the next part of the response, specify
-- this response value as the @PaginationToken@ value in the request for
-- the next page.
--
-- 'tagKeys', 'getTagKeysResponse_tagKeys' - A list of all tag keys in the Amazon Web Services account.
--
-- 'httpStatus', 'getTagKeysResponse_httpStatus' - The response's http status code.
newGetTagKeysResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  GetTagKeysResponse
newGetTagKeysResponse pHttpStatus_ =
  GetTagKeysResponse'
    { paginationToken =
        Prelude.Nothing,
      tagKeys = Prelude.Nothing,
      httpStatus = pHttpStatus_
    }

-- | A string that indicates that there is more data available than this
-- response contains. To receive the next part of the response, specify
-- this response value as the @PaginationToken@ value in the request for
-- the next page.
getTagKeysResponse_paginationToken :: Lens.Lens' GetTagKeysResponse (Prelude.Maybe Prelude.Text)
getTagKeysResponse_paginationToken = Lens.lens (\GetTagKeysResponse' {paginationToken} -> paginationToken) (\s@GetTagKeysResponse' {} a -> s {paginationToken = a} :: GetTagKeysResponse)

-- | A list of all tag keys in the Amazon Web Services account.
getTagKeysResponse_tagKeys :: Lens.Lens' GetTagKeysResponse (Prelude.Maybe [Prelude.Text])
getTagKeysResponse_tagKeys = Lens.lens (\GetTagKeysResponse' {tagKeys} -> tagKeys) (\s@GetTagKeysResponse' {} a -> s {tagKeys = a} :: GetTagKeysResponse) Prelude.. Lens.mapping Lens.coerced

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

instance Prelude.NFData GetTagKeysResponse where
  rnf GetTagKeysResponse' {..} =
    Prelude.rnf paginationToken
      `Prelude.seq` Prelude.rnf tagKeys
      `Prelude.seq` Prelude.rnf httpStatus