{-# 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.EKS.ListClusters
-- 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 the Amazon EKS clusters in your Amazon Web Services account in the
-- specified Region.
--
-- This operation returns paginated results.
module Amazonka.EKS.ListClusters
  ( -- * Creating a Request
    ListClusters (..),
    newListClusters,

    -- * Request Lenses
    listClusters_include,
    listClusters_maxResults,
    listClusters_nextToken,

    -- * Destructuring the Response
    ListClustersResponse (..),
    newListClustersResponse,

    -- * Response Lenses
    listClustersResponse_clusters,
    listClustersResponse_nextToken,
    listClustersResponse_httpStatus,
  )
where

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

-- | /See:/ 'newListClusters' smart constructor.
data ListClusters = ListClusters'
  { -- | Indicates whether external clusters are included in the returned list.
    -- Use \'@all@\' to return connected clusters, or blank to return only
    -- Amazon EKS clusters. \'@all@\' must be in lowercase otherwise an error
    -- occurs.
    include :: Prelude.Maybe [Prelude.Text],
    -- | The maximum number of cluster results returned by @ListClusters@ in
    -- paginated output. When you use this parameter, @ListClusters@ returns
    -- only @maxResults@ results in a single page along with a @nextToken@
    -- response element. You can see the remaining results of the initial
    -- request by sending another @ListClusters@ request with the returned
    -- @nextToken@ value. This value can be between 1 and 100. If you don\'t
    -- use this parameter, @ListClusters@ returns up to 100 results and a
    -- @nextToken@ value if applicable.
    maxResults :: Prelude.Maybe Prelude.Natural,
    -- | The @nextToken@ value returned from a previous paginated @ListClusters@
    -- request where @maxResults@ was used and the results exceeded the value
    -- of that parameter. Pagination continues from the end of the previous
    -- results that returned the @nextToken@ value.
    --
    -- This token should be treated as an opaque identifier that is used only
    -- to retrieve the next items in a list and not for other programmatic
    -- purposes.
    nextToken :: Prelude.Maybe Prelude.Text
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'ListClusters' 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:
--
-- 'include', 'listClusters_include' - Indicates whether external clusters are included in the returned list.
-- Use \'@all@\' to return connected clusters, or blank to return only
-- Amazon EKS clusters. \'@all@\' must be in lowercase otherwise an error
-- occurs.
--
-- 'maxResults', 'listClusters_maxResults' - The maximum number of cluster results returned by @ListClusters@ in
-- paginated output. When you use this parameter, @ListClusters@ returns
-- only @maxResults@ results in a single page along with a @nextToken@
-- response element. You can see the remaining results of the initial
-- request by sending another @ListClusters@ request with the returned
-- @nextToken@ value. This value can be between 1 and 100. If you don\'t
-- use this parameter, @ListClusters@ returns up to 100 results and a
-- @nextToken@ value if applicable.
--
-- 'nextToken', 'listClusters_nextToken' - The @nextToken@ value returned from a previous paginated @ListClusters@
-- request where @maxResults@ was used and the results exceeded the value
-- of that parameter. Pagination continues from the end of the previous
-- results that returned the @nextToken@ value.
--
-- This token should be treated as an opaque identifier that is used only
-- to retrieve the next items in a list and not for other programmatic
-- purposes.
newListClusters ::
  ListClusters
newListClusters =
  ListClusters'
    { include = Prelude.Nothing,
      maxResults = Prelude.Nothing,
      nextToken = Prelude.Nothing
    }

-- | Indicates whether external clusters are included in the returned list.
-- Use \'@all@\' to return connected clusters, or blank to return only
-- Amazon EKS clusters. \'@all@\' must be in lowercase otherwise an error
-- occurs.
listClusters_include :: Lens.Lens' ListClusters (Prelude.Maybe [Prelude.Text])
listClusters_include = Lens.lens (\ListClusters' {include} -> include) (\s@ListClusters' {} a -> s {include = a} :: ListClusters) Prelude.. Lens.mapping Lens.coerced

-- | The maximum number of cluster results returned by @ListClusters@ in
-- paginated output. When you use this parameter, @ListClusters@ returns
-- only @maxResults@ results in a single page along with a @nextToken@
-- response element. You can see the remaining results of the initial
-- request by sending another @ListClusters@ request with the returned
-- @nextToken@ value. This value can be between 1 and 100. If you don\'t
-- use this parameter, @ListClusters@ returns up to 100 results and a
-- @nextToken@ value if applicable.
listClusters_maxResults :: Lens.Lens' ListClusters (Prelude.Maybe Prelude.Natural)
listClusters_maxResults = Lens.lens (\ListClusters' {maxResults} -> maxResults) (\s@ListClusters' {} a -> s {maxResults = a} :: ListClusters)

-- | The @nextToken@ value returned from a previous paginated @ListClusters@
-- request where @maxResults@ was used and the results exceeded the value
-- of that parameter. Pagination continues from the end of the previous
-- results that returned the @nextToken@ value.
--
-- This token should be treated as an opaque identifier that is used only
-- to retrieve the next items in a list and not for other programmatic
-- purposes.
listClusters_nextToken :: Lens.Lens' ListClusters (Prelude.Maybe Prelude.Text)
listClusters_nextToken = Lens.lens (\ListClusters' {nextToken} -> nextToken) (\s@ListClusters' {} a -> s {nextToken = a} :: ListClusters)

instance Core.AWSPager ListClusters where
  page rq rs
    | Core.stop
        ( rs
            Lens.^? listClustersResponse_nextToken
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Core.stop
        ( rs
            Lens.^? listClustersResponse_clusters
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Prelude.otherwise =
        Prelude.Just
          Prelude.$ rq
          Prelude.& listClusters_nextToken
          Lens..~ rs
          Lens.^? listClustersResponse_nextToken
          Prelude.. Lens._Just

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

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

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

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

instance Data.ToPath ListClusters where
  toPath = Prelude.const "/clusters"

instance Data.ToQuery ListClusters where
  toQuery ListClusters' {..} =
    Prelude.mconcat
      [ "include"
          Data.=: Data.toQuery
            (Data.toQueryList "member" Prelude.<$> include),
        "maxResults" Data.=: maxResults,
        "nextToken" Data.=: nextToken
      ]

-- | /See:/ 'newListClustersResponse' smart constructor.
data ListClustersResponse = ListClustersResponse'
  { -- | A list of all of the clusters for your account in the specified Region.
    clusters :: Prelude.Maybe [Prelude.Text],
    -- | The @nextToken@ value to include in a future @ListClusters@ request.
    -- When the results of a @ListClusters@ request exceed @maxResults@, you
    -- can use this value to retrieve the next page of results. This value is
    -- @null@ when there are no more results to return.
    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 'ListClustersResponse' 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:
--
-- 'clusters', 'listClustersResponse_clusters' - A list of all of the clusters for your account in the specified Region.
--
-- 'nextToken', 'listClustersResponse_nextToken' - The @nextToken@ value to include in a future @ListClusters@ request.
-- When the results of a @ListClusters@ request exceed @maxResults@, you
-- can use this value to retrieve the next page of results. This value is
-- @null@ when there are no more results to return.
--
-- 'httpStatus', 'listClustersResponse_httpStatus' - The response's http status code.
newListClustersResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  ListClustersResponse
newListClustersResponse pHttpStatus_ =
  ListClustersResponse'
    { clusters = Prelude.Nothing,
      nextToken = Prelude.Nothing,
      httpStatus = pHttpStatus_
    }

-- | A list of all of the clusters for your account in the specified Region.
listClustersResponse_clusters :: Lens.Lens' ListClustersResponse (Prelude.Maybe [Prelude.Text])
listClustersResponse_clusters = Lens.lens (\ListClustersResponse' {clusters} -> clusters) (\s@ListClustersResponse' {} a -> s {clusters = a} :: ListClustersResponse) Prelude.. Lens.mapping Lens.coerced

-- | The @nextToken@ value to include in a future @ListClusters@ request.
-- When the results of a @ListClusters@ request exceed @maxResults@, you
-- can use this value to retrieve the next page of results. This value is
-- @null@ when there are no more results to return.
listClustersResponse_nextToken :: Lens.Lens' ListClustersResponse (Prelude.Maybe Prelude.Text)
listClustersResponse_nextToken = Lens.lens (\ListClustersResponse' {nextToken} -> nextToken) (\s@ListClustersResponse' {} a -> s {nextToken = a} :: ListClustersResponse)

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

instance Prelude.NFData ListClustersResponse where
  rnf ListClustersResponse' {..} =
    Prelude.rnf clusters
      `Prelude.seq` Prelude.rnf nextToken
      `Prelude.seq` Prelude.rnf httpStatus