{-# 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.MediaPackage.ListChannels
-- 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 collection of Channels.
--
-- This operation returns paginated results.
module Amazonka.MediaPackage.ListChannels
  ( -- * Creating a Request
    ListChannels (..),
    newListChannels,

    -- * Request Lenses
    listChannels_maxResults,
    listChannels_nextToken,

    -- * Destructuring the Response
    ListChannelsResponse (..),
    newListChannelsResponse,

    -- * Response Lenses
    listChannelsResponse_channels,
    listChannelsResponse_nextToken,
    listChannelsResponse_httpStatus,
  )
where

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

-- | /See:/ 'newListChannels' smart constructor.
data ListChannels = ListChannels'
  { -- | Upper bound on number of records to return.
    maxResults :: Prelude.Maybe Prelude.Natural,
    -- | A token used to resume pagination from the end of a previous request.
    nextToken :: Prelude.Maybe Prelude.Text
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'ListChannels' 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', 'listChannels_maxResults' - Upper bound on number of records to return.
--
-- 'nextToken', 'listChannels_nextToken' - A token used to resume pagination from the end of a previous request.
newListChannels ::
  ListChannels
newListChannels =
  ListChannels'
    { maxResults = Prelude.Nothing,
      nextToken = Prelude.Nothing
    }

-- | Upper bound on number of records to return.
listChannels_maxResults :: Lens.Lens' ListChannels (Prelude.Maybe Prelude.Natural)
listChannels_maxResults = Lens.lens (\ListChannels' {maxResults} -> maxResults) (\s@ListChannels' {} a -> s {maxResults = a} :: ListChannels)

-- | A token used to resume pagination from the end of a previous request.
listChannels_nextToken :: Lens.Lens' ListChannels (Prelude.Maybe Prelude.Text)
listChannels_nextToken = Lens.lens (\ListChannels' {nextToken} -> nextToken) (\s@ListChannels' {} a -> s {nextToken = a} :: ListChannels)

instance Core.AWSPager ListChannels where
  page rq rs
    | Core.stop
        ( rs
            Lens.^? listChannelsResponse_nextToken
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Core.stop
        ( rs
            Lens.^? listChannelsResponse_channels
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Prelude.otherwise =
        Prelude.Just
          Prelude.$ rq
          Prelude.& listChannels_nextToken
          Lens..~ rs
          Lens.^? listChannelsResponse_nextToken
          Prelude.. Lens._Just

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

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

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

instance Data.ToHeaders ListChannels where
  toHeaders =
    Prelude.const
      ( Prelude.mconcat
          [ "Content-Type"
              Data.=# ( "application/x-amz-json-1.1" ::
                          Prelude.ByteString
                      )
          ]
      )

instance Data.ToPath ListChannels where
  toPath = Prelude.const "/channels"

instance Data.ToQuery ListChannels where
  toQuery ListChannels' {..} =
    Prelude.mconcat
      [ "maxResults" Data.=: maxResults,
        "nextToken" Data.=: nextToken
      ]

-- | /See:/ 'newListChannelsResponse' smart constructor.
data ListChannelsResponse = ListChannelsResponse'
  { -- | A list of Channel records.
    channels :: Prelude.Maybe [Channel],
    -- | A token that can be used to resume pagination from the end of the
    -- collection.
    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 'ListChannelsResponse' 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:
--
-- 'channels', 'listChannelsResponse_channels' - A list of Channel records.
--
-- 'nextToken', 'listChannelsResponse_nextToken' - A token that can be used to resume pagination from the end of the
-- collection.
--
-- 'httpStatus', 'listChannelsResponse_httpStatus' - The response's http status code.
newListChannelsResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  ListChannelsResponse
newListChannelsResponse pHttpStatus_ =
  ListChannelsResponse'
    { channels = Prelude.Nothing,
      nextToken = Prelude.Nothing,
      httpStatus = pHttpStatus_
    }

-- | A list of Channel records.
listChannelsResponse_channels :: Lens.Lens' ListChannelsResponse (Prelude.Maybe [Channel])
listChannelsResponse_channels = Lens.lens (\ListChannelsResponse' {channels} -> channels) (\s@ListChannelsResponse' {} a -> s {channels = a} :: ListChannelsResponse) Prelude.. Lens.mapping Lens.coerced

-- | A token that can be used to resume pagination from the end of the
-- collection.
listChannelsResponse_nextToken :: Lens.Lens' ListChannelsResponse (Prelude.Maybe Prelude.Text)
listChannelsResponse_nextToken = Lens.lens (\ListChannelsResponse' {nextToken} -> nextToken) (\s@ListChannelsResponse' {} a -> s {nextToken = a} :: ListChannelsResponse)

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

instance Prelude.NFData ListChannelsResponse where
  rnf ListChannelsResponse' {..} =
    Prelude.rnf channels
      `Prelude.seq` Prelude.rnf nextToken
      `Prelude.seq` Prelude.rnf httpStatus