{-# 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.Greengrass.ListGroups
-- Copyright   : (c) 2013-2023 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay
-- Stability   : auto-generated
-- Portability : non-portable (GHC extensions)
--
-- Retrieves a list of groups.
--
-- This operation returns paginated results.
module Amazonka.Greengrass.ListGroups
  ( -- * Creating a Request
    ListGroups (..),
    newListGroups,

    -- * Request Lenses
    listGroups_maxResults,
    listGroups_nextToken,

    -- * Destructuring the Response
    ListGroupsResponse (..),
    newListGroupsResponse,

    -- * Response Lenses
    listGroupsResponse_groups,
    listGroupsResponse_nextToken,
    listGroupsResponse_httpStatus,
  )
where

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

-- | /See:/ 'newListGroups' smart constructor.
data ListGroups = ListGroups'
  { -- | The maximum number of results to be returned per request.
    maxResults :: Prelude.Maybe Prelude.Text,
    -- | The token for the next set of results, or \'\'null\'\' if there are no
    -- additional results.
    nextToken :: Prelude.Maybe Prelude.Text
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'ListGroups' 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', 'listGroups_maxResults' - The maximum number of results to be returned per request.
--
-- 'nextToken', 'listGroups_nextToken' - The token for the next set of results, or \'\'null\'\' if there are no
-- additional results.
newListGroups ::
  ListGroups
newListGroups =
  ListGroups'
    { maxResults = Prelude.Nothing,
      nextToken = Prelude.Nothing
    }

-- | The maximum number of results to be returned per request.
listGroups_maxResults :: Lens.Lens' ListGroups (Prelude.Maybe Prelude.Text)
listGroups_maxResults = Lens.lens (\ListGroups' {maxResults} -> maxResults) (\s@ListGroups' {} a -> s {maxResults = a} :: ListGroups)

-- | The token for the next set of results, or \'\'null\'\' if there are no
-- additional results.
listGroups_nextToken :: Lens.Lens' ListGroups (Prelude.Maybe Prelude.Text)
listGroups_nextToken = Lens.lens (\ListGroups' {nextToken} -> nextToken) (\s@ListGroups' {} a -> s {nextToken = a} :: ListGroups)

instance Core.AWSPager ListGroups where
  page rq rs
    | Core.stop
        ( rs
            Lens.^? listGroupsResponse_nextToken
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Core.stop
        ( rs
            Lens.^? listGroupsResponse_groups
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Prelude.otherwise =
        Prelude.Just
          Prelude.$ rq
          Prelude.& listGroups_nextToken
          Lens..~ rs
          Lens.^? listGroupsResponse_nextToken
          Prelude.. Lens._Just

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

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

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

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

instance Data.ToPath ListGroups where
  toPath = Prelude.const "/greengrass/groups"

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

-- | /See:/ 'newListGroupsResponse' smart constructor.
data ListGroupsResponse = ListGroupsResponse'
  { -- | Information about a group.
    groups :: Prelude.Maybe [GroupInformation],
    -- | The token for the next set of results, or \'\'null\'\' if there are no
    -- additional results.
    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 'ListGroupsResponse' 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:
--
-- 'groups', 'listGroupsResponse_groups' - Information about a group.
--
-- 'nextToken', 'listGroupsResponse_nextToken' - The token for the next set of results, or \'\'null\'\' if there are no
-- additional results.
--
-- 'httpStatus', 'listGroupsResponse_httpStatus' - The response's http status code.
newListGroupsResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  ListGroupsResponse
newListGroupsResponse pHttpStatus_ =
  ListGroupsResponse'
    { groups = Prelude.Nothing,
      nextToken = Prelude.Nothing,
      httpStatus = pHttpStatus_
    }

-- | Information about a group.
listGroupsResponse_groups :: Lens.Lens' ListGroupsResponse (Prelude.Maybe [GroupInformation])
listGroupsResponse_groups = Lens.lens (\ListGroupsResponse' {groups} -> groups) (\s@ListGroupsResponse' {} a -> s {groups = a} :: ListGroupsResponse) Prelude.. Lens.mapping Lens.coerced

-- | The token for the next set of results, or \'\'null\'\' if there are no
-- additional results.
listGroupsResponse_nextToken :: Lens.Lens' ListGroupsResponse (Prelude.Maybe Prelude.Text)
listGroupsResponse_nextToken = Lens.lens (\ListGroupsResponse' {nextToken} -> nextToken) (\s@ListGroupsResponse' {} a -> s {nextToken = a} :: ListGroupsResponse)

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

instance Prelude.NFData ListGroupsResponse where
  rnf ListGroupsResponse' {..} =
    Prelude.rnf groups
      `Prelude.seq` Prelude.rnf nextToken
      `Prelude.seq` Prelude.rnf httpStatus