{-# 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.IoT.ListPolicies
-- 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 your policies.
--
-- Requires permission to access the
-- <https://docs.aws.amazon.com/service-authorization/latest/reference/list_awsiot.html#awsiot-actions-as-permissions ListPolicies>
-- action.
--
-- This operation returns paginated results.
module Amazonka.IoT.ListPolicies
  ( -- * Creating a Request
    ListPolicies (..),
    newListPolicies,

    -- * Request Lenses
    listPolicies_ascendingOrder,
    listPolicies_marker,
    listPolicies_pageSize,

    -- * Destructuring the Response
    ListPoliciesResponse (..),
    newListPoliciesResponse,

    -- * Response Lenses
    listPoliciesResponse_nextMarker,
    listPoliciesResponse_policies,
    listPoliciesResponse_httpStatus,
  )
where

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

-- | The input for the ListPolicies operation.
--
-- /See:/ 'newListPolicies' smart constructor.
data ListPolicies = ListPolicies'
  { -- | Specifies the order for results. If true, the results are returned in
    -- ascending creation order.
    ascendingOrder :: Prelude.Maybe Prelude.Bool,
    -- | The marker for the next set of results.
    marker :: Prelude.Maybe Prelude.Text,
    -- | The result page size.
    pageSize :: Prelude.Maybe Prelude.Natural
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'ListPolicies' 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:
--
-- 'ascendingOrder', 'listPolicies_ascendingOrder' - Specifies the order for results. If true, the results are returned in
-- ascending creation order.
--
-- 'marker', 'listPolicies_marker' - The marker for the next set of results.
--
-- 'pageSize', 'listPolicies_pageSize' - The result page size.
newListPolicies ::
  ListPolicies
newListPolicies =
  ListPolicies'
    { ascendingOrder = Prelude.Nothing,
      marker = Prelude.Nothing,
      pageSize = Prelude.Nothing
    }

-- | Specifies the order for results. If true, the results are returned in
-- ascending creation order.
listPolicies_ascendingOrder :: Lens.Lens' ListPolicies (Prelude.Maybe Prelude.Bool)
listPolicies_ascendingOrder = Lens.lens (\ListPolicies' {ascendingOrder} -> ascendingOrder) (\s@ListPolicies' {} a -> s {ascendingOrder = a} :: ListPolicies)

-- | The marker for the next set of results.
listPolicies_marker :: Lens.Lens' ListPolicies (Prelude.Maybe Prelude.Text)
listPolicies_marker = Lens.lens (\ListPolicies' {marker} -> marker) (\s@ListPolicies' {} a -> s {marker = a} :: ListPolicies)

-- | The result page size.
listPolicies_pageSize :: Lens.Lens' ListPolicies (Prelude.Maybe Prelude.Natural)
listPolicies_pageSize = Lens.lens (\ListPolicies' {pageSize} -> pageSize) (\s@ListPolicies' {} a -> s {pageSize = a} :: ListPolicies)

instance Core.AWSPager ListPolicies where
  page rq rs
    | Core.stop
        ( rs
            Lens.^? listPoliciesResponse_nextMarker
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Core.stop
        ( rs
            Lens.^? listPoliciesResponse_policies
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Prelude.otherwise =
        Prelude.Just
          Prelude.$ rq
          Prelude.& listPolicies_marker
          Lens..~ rs
          Lens.^? listPoliciesResponse_nextMarker
          Prelude.. Lens._Just

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

instance Prelude.Hashable ListPolicies where
  hashWithSalt _salt ListPolicies' {..} =
    _salt
      `Prelude.hashWithSalt` ascendingOrder
      `Prelude.hashWithSalt` marker
      `Prelude.hashWithSalt` pageSize

instance Prelude.NFData ListPolicies where
  rnf ListPolicies' {..} =
    Prelude.rnf ascendingOrder
      `Prelude.seq` Prelude.rnf marker
      `Prelude.seq` Prelude.rnf pageSize

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

instance Data.ToPath ListPolicies where
  toPath = Prelude.const "/policies"

instance Data.ToQuery ListPolicies where
  toQuery ListPolicies' {..} =
    Prelude.mconcat
      [ "isAscendingOrder" Data.=: ascendingOrder,
        "marker" Data.=: marker,
        "pageSize" Data.=: pageSize
      ]

-- | The output from the ListPolicies operation.
--
-- /See:/ 'newListPoliciesResponse' smart constructor.
data ListPoliciesResponse = ListPoliciesResponse'
  { -- | The marker for the next set of results, or null if there are no
    -- additional results.
    nextMarker :: Prelude.Maybe Prelude.Text,
    -- | The descriptions of the policies.
    policies :: Prelude.Maybe [Policy],
    -- | The response's http status code.
    httpStatus :: Prelude.Int
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'ListPoliciesResponse' 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:
--
-- 'nextMarker', 'listPoliciesResponse_nextMarker' - The marker for the next set of results, or null if there are no
-- additional results.
--
-- 'policies', 'listPoliciesResponse_policies' - The descriptions of the policies.
--
-- 'httpStatus', 'listPoliciesResponse_httpStatus' - The response's http status code.
newListPoliciesResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  ListPoliciesResponse
newListPoliciesResponse pHttpStatus_ =
  ListPoliciesResponse'
    { nextMarker = Prelude.Nothing,
      policies = Prelude.Nothing,
      httpStatus = pHttpStatus_
    }

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

-- | The descriptions of the policies.
listPoliciesResponse_policies :: Lens.Lens' ListPoliciesResponse (Prelude.Maybe [Policy])
listPoliciesResponse_policies = Lens.lens (\ListPoliciesResponse' {policies} -> policies) (\s@ListPoliciesResponse' {} a -> s {policies = a} :: ListPoliciesResponse) Prelude.. Lens.mapping Lens.coerced

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

instance Prelude.NFData ListPoliciesResponse where
  rnf ListPoliciesResponse' {..} =
    Prelude.rnf nextMarker
      `Prelude.seq` Prelude.rnf policies
      `Prelude.seq` Prelude.rnf httpStatus