{-# 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.SNS.ListTopics
-- 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 a list of the requester\'s topics. Each call returns a limited
-- list of topics, up to 100. If there are more topics, a @NextToken@ is
-- also returned. Use the @NextToken@ parameter in a new @ListTopics@ call
-- to get further results.
--
-- This action is throttled at 30 transactions per second (TPS).
--
-- This operation returns paginated results.
module Amazonka.SNS.ListTopics
  ( -- * Creating a Request
    ListTopics (..),
    newListTopics,

    -- * Request Lenses
    listTopics_nextToken,

    -- * Destructuring the Response
    ListTopicsResponse (..),
    newListTopicsResponse,

    -- * Response Lenses
    listTopicsResponse_nextToken,
    listTopicsResponse_topics,
    listTopicsResponse_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.SNS.Types

-- | /See:/ 'newListTopics' smart constructor.
data ListTopics = ListTopics'
  { -- | Token returned by the previous @ListTopics@ request.
    nextToken :: Prelude.Maybe Prelude.Text
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'ListTopics' 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:
--
-- 'nextToken', 'listTopics_nextToken' - Token returned by the previous @ListTopics@ request.
newListTopics ::
  ListTopics
newListTopics =
  ListTopics' {nextToken = Prelude.Nothing}

-- | Token returned by the previous @ListTopics@ request.
listTopics_nextToken :: Lens.Lens' ListTopics (Prelude.Maybe Prelude.Text)
listTopics_nextToken = Lens.lens (\ListTopics' {nextToken} -> nextToken) (\s@ListTopics' {} a -> s {nextToken = a} :: ListTopics)

instance Core.AWSPager ListTopics where
  page rq rs
    | Core.stop
        ( rs
            Lens.^? listTopicsResponse_nextToken
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Core.stop
        ( rs
            Lens.^? listTopicsResponse_topics
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Prelude.otherwise =
        Prelude.Just
          Prelude.$ rq
          Prelude.& listTopics_nextToken
          Lens..~ rs
          Lens.^? listTopicsResponse_nextToken
          Prelude.. Lens._Just

instance Core.AWSRequest ListTopics where
  type AWSResponse ListTopics = ListTopicsResponse
  request overrides =
    Request.postQuery (overrides defaultService)
  response =
    Response.receiveXMLWrapper
      "ListTopicsResult"
      ( \s h x ->
          ListTopicsResponse'
            Prelude.<$> (x Data..@? "NextToken")
            Prelude.<*> ( x
                            Data..@? "Topics"
                            Core..!@ Prelude.mempty
                            Prelude.>>= Core.may (Data.parseXMLList "member")
                        )
            Prelude.<*> (Prelude.pure (Prelude.fromEnum s))
      )

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

instance Prelude.NFData ListTopics where
  rnf ListTopics' {..} = Prelude.rnf nextToken

instance Data.ToHeaders ListTopics where
  toHeaders = Prelude.const Prelude.mempty

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

instance Data.ToQuery ListTopics where
  toQuery ListTopics' {..} =
    Prelude.mconcat
      [ "Action"
          Data.=: ("ListTopics" :: Prelude.ByteString),
        "Version"
          Data.=: ("2010-03-31" :: Prelude.ByteString),
        "NextToken" Data.=: nextToken
      ]

-- | Response for ListTopics action.
--
-- /See:/ 'newListTopicsResponse' smart constructor.
data ListTopicsResponse = ListTopicsResponse'
  { -- | Token to pass along to the next @ListTopics@ request. This element is
    -- returned if there are additional topics to retrieve.
    nextToken :: Prelude.Maybe Prelude.Text,
    -- | A list of topic ARNs.
    topics :: Prelude.Maybe [Topic],
    -- | The response's http status code.
    httpStatus :: Prelude.Int
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'ListTopicsResponse' 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:
--
-- 'nextToken', 'listTopicsResponse_nextToken' - Token to pass along to the next @ListTopics@ request. This element is
-- returned if there are additional topics to retrieve.
--
-- 'topics', 'listTopicsResponse_topics' - A list of topic ARNs.
--
-- 'httpStatus', 'listTopicsResponse_httpStatus' - The response's http status code.
newListTopicsResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  ListTopicsResponse
newListTopicsResponse pHttpStatus_ =
  ListTopicsResponse'
    { nextToken = Prelude.Nothing,
      topics = Prelude.Nothing,
      httpStatus = pHttpStatus_
    }

-- | Token to pass along to the next @ListTopics@ request. This element is
-- returned if there are additional topics to retrieve.
listTopicsResponse_nextToken :: Lens.Lens' ListTopicsResponse (Prelude.Maybe Prelude.Text)
listTopicsResponse_nextToken = Lens.lens (\ListTopicsResponse' {nextToken} -> nextToken) (\s@ListTopicsResponse' {} a -> s {nextToken = a} :: ListTopicsResponse)

-- | A list of topic ARNs.
listTopicsResponse_topics :: Lens.Lens' ListTopicsResponse (Prelude.Maybe [Topic])
listTopicsResponse_topics = Lens.lens (\ListTopicsResponse' {topics} -> topics) (\s@ListTopicsResponse' {} a -> s {topics = a} :: ListTopicsResponse) Prelude.. Lens.mapping Lens.coerced

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

instance Prelude.NFData ListTopicsResponse where
  rnf ListTopicsResponse' {..} =
    Prelude.rnf nextToken
      `Prelude.seq` Prelude.rnf topics
      `Prelude.seq` Prelude.rnf httpStatus