{-# 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.AutoScaling.DescribePolicies
-- Copyright   : (c) 2013-2023 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay
-- Stability   : auto-generated
-- Portability : non-portable (GHC extensions)
--
-- Gets information about the scaling policies in the account and Region.
--
-- This operation returns paginated results.
module Amazonka.AutoScaling.DescribePolicies
  ( -- * Creating a Request
    DescribePolicies (..),
    newDescribePolicies,

    -- * Request Lenses
    describePolicies_autoScalingGroupName,
    describePolicies_maxRecords,
    describePolicies_nextToken,
    describePolicies_policyNames,
    describePolicies_policyTypes,

    -- * Destructuring the Response
    DescribePoliciesResponse (..),
    newDescribePoliciesResponse,

    -- * Response Lenses
    describePoliciesResponse_nextToken,
    describePoliciesResponse_scalingPolicies,
    describePoliciesResponse_httpStatus,
  )
where

import Amazonka.AutoScaling.Types
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

-- | /See:/ 'newDescribePolicies' smart constructor.
data DescribePolicies = DescribePolicies'
  { -- | The name of the Auto Scaling group.
    autoScalingGroupName :: Prelude.Maybe Prelude.Text,
    -- | The maximum number of items to be returned with each call. The default
    -- value is @50@ and the maximum value is @100@.
    maxRecords :: Prelude.Maybe Prelude.Int,
    -- | The token for the next set of items to return. (You received this token
    -- from a previous call.)
    nextToken :: Prelude.Maybe Prelude.Text,
    -- | The names of one or more policies. If you omit this property, all
    -- policies are described. If a group name is provided, the results are
    -- limited to that group. If you specify an unknown policy name, it is
    -- ignored with no error.
    --
    -- Array Members: Maximum number of 50 items.
    policyNames :: Prelude.Maybe [Prelude.Text],
    -- | One or more policy types. The valid values are @SimpleScaling@,
    -- @StepScaling@, @TargetTrackingScaling@, and @PredictiveScaling@.
    policyTypes :: Prelude.Maybe [Prelude.Text]
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'DescribePolicies' 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:
--
-- 'autoScalingGroupName', 'describePolicies_autoScalingGroupName' - The name of the Auto Scaling group.
--
-- 'maxRecords', 'describePolicies_maxRecords' - The maximum number of items to be returned with each call. The default
-- value is @50@ and the maximum value is @100@.
--
-- 'nextToken', 'describePolicies_nextToken' - The token for the next set of items to return. (You received this token
-- from a previous call.)
--
-- 'policyNames', 'describePolicies_policyNames' - The names of one or more policies. If you omit this property, all
-- policies are described. If a group name is provided, the results are
-- limited to that group. If you specify an unknown policy name, it is
-- ignored with no error.
--
-- Array Members: Maximum number of 50 items.
--
-- 'policyTypes', 'describePolicies_policyTypes' - One or more policy types. The valid values are @SimpleScaling@,
-- @StepScaling@, @TargetTrackingScaling@, and @PredictiveScaling@.
newDescribePolicies ::
  DescribePolicies
newDescribePolicies =
  DescribePolicies'
    { autoScalingGroupName =
        Prelude.Nothing,
      maxRecords = Prelude.Nothing,
      nextToken = Prelude.Nothing,
      policyNames = Prelude.Nothing,
      policyTypes = Prelude.Nothing
    }

-- | The name of the Auto Scaling group.
describePolicies_autoScalingGroupName :: Lens.Lens' DescribePolicies (Prelude.Maybe Prelude.Text)
describePolicies_autoScalingGroupName = Lens.lens (\DescribePolicies' {autoScalingGroupName} -> autoScalingGroupName) (\s@DescribePolicies' {} a -> s {autoScalingGroupName = a} :: DescribePolicies)

-- | The maximum number of items to be returned with each call. The default
-- value is @50@ and the maximum value is @100@.
describePolicies_maxRecords :: Lens.Lens' DescribePolicies (Prelude.Maybe Prelude.Int)
describePolicies_maxRecords = Lens.lens (\DescribePolicies' {maxRecords} -> maxRecords) (\s@DescribePolicies' {} a -> s {maxRecords = a} :: DescribePolicies)

-- | The token for the next set of items to return. (You received this token
-- from a previous call.)
describePolicies_nextToken :: Lens.Lens' DescribePolicies (Prelude.Maybe Prelude.Text)
describePolicies_nextToken = Lens.lens (\DescribePolicies' {nextToken} -> nextToken) (\s@DescribePolicies' {} a -> s {nextToken = a} :: DescribePolicies)

-- | The names of one or more policies. If you omit this property, all
-- policies are described. If a group name is provided, the results are
-- limited to that group. If you specify an unknown policy name, it is
-- ignored with no error.
--
-- Array Members: Maximum number of 50 items.
describePolicies_policyNames :: Lens.Lens' DescribePolicies (Prelude.Maybe [Prelude.Text])
describePolicies_policyNames = Lens.lens (\DescribePolicies' {policyNames} -> policyNames) (\s@DescribePolicies' {} a -> s {policyNames = a} :: DescribePolicies) Prelude.. Lens.mapping Lens.coerced

-- | One or more policy types. The valid values are @SimpleScaling@,
-- @StepScaling@, @TargetTrackingScaling@, and @PredictiveScaling@.
describePolicies_policyTypes :: Lens.Lens' DescribePolicies (Prelude.Maybe [Prelude.Text])
describePolicies_policyTypes = Lens.lens (\DescribePolicies' {policyTypes} -> policyTypes) (\s@DescribePolicies' {} a -> s {policyTypes = a} :: DescribePolicies) Prelude.. Lens.mapping Lens.coerced

instance Core.AWSPager DescribePolicies where
  page rq rs
    | Core.stop
        ( rs
            Lens.^? describePoliciesResponse_nextToken
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Core.stop
        ( rs
            Lens.^? describePoliciesResponse_scalingPolicies
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Prelude.otherwise =
        Prelude.Just
          Prelude.$ rq
          Prelude.& describePolicies_nextToken
          Lens..~ rs
          Lens.^? describePoliciesResponse_nextToken
          Prelude.. Lens._Just

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

instance Prelude.Hashable DescribePolicies where
  hashWithSalt _salt DescribePolicies' {..} =
    _salt
      `Prelude.hashWithSalt` autoScalingGroupName
      `Prelude.hashWithSalt` maxRecords
      `Prelude.hashWithSalt` nextToken
      `Prelude.hashWithSalt` policyNames
      `Prelude.hashWithSalt` policyTypes

instance Prelude.NFData DescribePolicies where
  rnf DescribePolicies' {..} =
    Prelude.rnf autoScalingGroupName
      `Prelude.seq` Prelude.rnf maxRecords
      `Prelude.seq` Prelude.rnf nextToken
      `Prelude.seq` Prelude.rnf policyNames
      `Prelude.seq` Prelude.rnf policyTypes

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

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

instance Data.ToQuery DescribePolicies where
  toQuery DescribePolicies' {..} =
    Prelude.mconcat
      [ "Action"
          Data.=: ("DescribePolicies" :: Prelude.ByteString),
        "Version"
          Data.=: ("2011-01-01" :: Prelude.ByteString),
        "AutoScalingGroupName" Data.=: autoScalingGroupName,
        "MaxRecords" Data.=: maxRecords,
        "NextToken" Data.=: nextToken,
        "PolicyNames"
          Data.=: Data.toQuery
            (Data.toQueryList "member" Prelude.<$> policyNames),
        "PolicyTypes"
          Data.=: Data.toQuery
            (Data.toQueryList "member" Prelude.<$> policyTypes)
      ]

-- | /See:/ 'newDescribePoliciesResponse' smart constructor.
data DescribePoliciesResponse = DescribePoliciesResponse'
  { -- | A string that indicates that the response contains more items than can
    -- be returned in a single response. To receive additional items, specify
    -- this string for the @NextToken@ value when requesting the next set of
    -- items. This value is null when there are no more items to return.
    nextToken :: Prelude.Maybe Prelude.Text,
    -- | The scaling policies.
    scalingPolicies :: Prelude.Maybe [ScalingPolicy],
    -- | The response's http status code.
    httpStatus :: Prelude.Int
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'DescribePoliciesResponse' 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', 'describePoliciesResponse_nextToken' - A string that indicates that the response contains more items than can
-- be returned in a single response. To receive additional items, specify
-- this string for the @NextToken@ value when requesting the next set of
-- items. This value is null when there are no more items to return.
--
-- 'scalingPolicies', 'describePoliciesResponse_scalingPolicies' - The scaling policies.
--
-- 'httpStatus', 'describePoliciesResponse_httpStatus' - The response's http status code.
newDescribePoliciesResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  DescribePoliciesResponse
newDescribePoliciesResponse pHttpStatus_ =
  DescribePoliciesResponse'
    { nextToken =
        Prelude.Nothing,
      scalingPolicies = Prelude.Nothing,
      httpStatus = pHttpStatus_
    }

-- | A string that indicates that the response contains more items than can
-- be returned in a single response. To receive additional items, specify
-- this string for the @NextToken@ value when requesting the next set of
-- items. This value is null when there are no more items to return.
describePoliciesResponse_nextToken :: Lens.Lens' DescribePoliciesResponse (Prelude.Maybe Prelude.Text)
describePoliciesResponse_nextToken = Lens.lens (\DescribePoliciesResponse' {nextToken} -> nextToken) (\s@DescribePoliciesResponse' {} a -> s {nextToken = a} :: DescribePoliciesResponse)

-- | The scaling policies.
describePoliciesResponse_scalingPolicies :: Lens.Lens' DescribePoliciesResponse (Prelude.Maybe [ScalingPolicy])
describePoliciesResponse_scalingPolicies = Lens.lens (\DescribePoliciesResponse' {scalingPolicies} -> scalingPolicies) (\s@DescribePoliciesResponse' {} a -> s {scalingPolicies = a} :: DescribePoliciesResponse) Prelude.. Lens.mapping Lens.coerced

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

instance Prelude.NFData DescribePoliciesResponse where
  rnf DescribePoliciesResponse' {..} =
    Prelude.rnf nextToken
      `Prelude.seq` Prelude.rnf scalingPolicies
      `Prelude.seq` Prelude.rnf httpStatus