{-# 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.MemoryDb.DescribeParameters
-- 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 the detailed parameter list for a particular parameter group.
--
-- This operation returns paginated results.
module Amazonka.MemoryDb.DescribeParameters
  ( -- * Creating a Request
    DescribeParameters (..),
    newDescribeParameters,

    -- * Request Lenses
    describeParameters_maxResults,
    describeParameters_nextToken,
    describeParameters_parameterGroupName,

    -- * Destructuring the Response
    DescribeParametersResponse (..),
    newDescribeParametersResponse,

    -- * Response Lenses
    describeParametersResponse_nextToken,
    describeParametersResponse_parameters,
    describeParametersResponse_httpStatus,
  )
where

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

-- | /See:/ 'newDescribeParameters' smart constructor.
data DescribeParameters = DescribeParameters'
  { -- | The maximum number of records to include in the response. If more
    -- records exist than the specified MaxResults value, a token is included
    -- in the response so that the remaining results can be retrieved.
    maxResults :: Prelude.Maybe Prelude.Int,
    -- | An optional argument to pass in case the total number of records exceeds
    -- the value of MaxResults. If nextToken is returned, there are more
    -- results available. The value of nextToken is a unique pagination token
    -- for each page. Make the call again using the returned token to retrieve
    -- the next page. Keep all other arguments unchanged.
    nextToken :: Prelude.Maybe Prelude.Text,
    -- | he name of a specific parameter group to return details for.
    parameterGroupName :: Prelude.Text
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'DescribeParameters' 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', 'describeParameters_maxResults' - The maximum number of records to include in the response. If more
-- records exist than the specified MaxResults value, a token is included
-- in the response so that the remaining results can be retrieved.
--
-- 'nextToken', 'describeParameters_nextToken' - An optional argument to pass in case the total number of records exceeds
-- the value of MaxResults. If nextToken is returned, there are more
-- results available. The value of nextToken is a unique pagination token
-- for each page. Make the call again using the returned token to retrieve
-- the next page. Keep all other arguments unchanged.
--
-- 'parameterGroupName', 'describeParameters_parameterGroupName' - he name of a specific parameter group to return details for.
newDescribeParameters ::
  -- | 'parameterGroupName'
  Prelude.Text ->
  DescribeParameters
newDescribeParameters pParameterGroupName_ =
  DescribeParameters'
    { maxResults = Prelude.Nothing,
      nextToken = Prelude.Nothing,
      parameterGroupName = pParameterGroupName_
    }

-- | The maximum number of records to include in the response. If more
-- records exist than the specified MaxResults value, a token is included
-- in the response so that the remaining results can be retrieved.
describeParameters_maxResults :: Lens.Lens' DescribeParameters (Prelude.Maybe Prelude.Int)
describeParameters_maxResults = Lens.lens (\DescribeParameters' {maxResults} -> maxResults) (\s@DescribeParameters' {} a -> s {maxResults = a} :: DescribeParameters)

-- | An optional argument to pass in case the total number of records exceeds
-- the value of MaxResults. If nextToken is returned, there are more
-- results available. The value of nextToken is a unique pagination token
-- for each page. Make the call again using the returned token to retrieve
-- the next page. Keep all other arguments unchanged.
describeParameters_nextToken :: Lens.Lens' DescribeParameters (Prelude.Maybe Prelude.Text)
describeParameters_nextToken = Lens.lens (\DescribeParameters' {nextToken} -> nextToken) (\s@DescribeParameters' {} a -> s {nextToken = a} :: DescribeParameters)

-- | he name of a specific parameter group to return details for.
describeParameters_parameterGroupName :: Lens.Lens' DescribeParameters Prelude.Text
describeParameters_parameterGroupName = Lens.lens (\DescribeParameters' {parameterGroupName} -> parameterGroupName) (\s@DescribeParameters' {} a -> s {parameterGroupName = a} :: DescribeParameters)

instance Core.AWSPager DescribeParameters where
  page rq rs
    | Core.stop
        ( rs
            Lens.^? describeParametersResponse_nextToken
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Core.stop
        ( rs
            Lens.^? describeParametersResponse_parameters
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Prelude.otherwise =
        Prelude.Just
          Prelude.$ rq
          Prelude.& describeParameters_nextToken
          Lens..~ rs
          Lens.^? describeParametersResponse_nextToken
          Prelude.. Lens._Just

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

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

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

instance Data.ToHeaders DescribeParameters where
  toHeaders =
    Prelude.const
      ( Prelude.mconcat
          [ "X-Amz-Target"
              Data.=# ( "AmazonMemoryDB.DescribeParameters" ::
                          Prelude.ByteString
                      ),
            "Content-Type"
              Data.=# ( "application/x-amz-json-1.1" ::
                          Prelude.ByteString
                      )
          ]
      )

instance Data.ToJSON DescribeParameters where
  toJSON DescribeParameters' {..} =
    Data.object
      ( Prelude.catMaybes
          [ ("MaxResults" Data..=) Prelude.<$> maxResults,
            ("NextToken" Data..=) Prelude.<$> nextToken,
            Prelude.Just
              ("ParameterGroupName" Data..= parameterGroupName)
          ]
      )

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

instance Data.ToQuery DescribeParameters where
  toQuery = Prelude.const Prelude.mempty

-- | /See:/ 'newDescribeParametersResponse' smart constructor.
data DescribeParametersResponse = DescribeParametersResponse'
  { -- | An optional argument to pass in case the total number of records exceeds
    -- the value of MaxResults. If nextToken is returned, there are more
    -- results available. The value of nextToken is a unique pagination token
    -- for each page. Make the call again using the returned token to retrieve
    -- the next page. Keep all other arguments unchanged.
    nextToken :: Prelude.Maybe Prelude.Text,
    -- | A list of parameters specific to a particular parameter group. Each
    -- element in the list contains detailed information about one parameter.
    parameters :: Prelude.Maybe [Parameter],
    -- | The response's http status code.
    httpStatus :: Prelude.Int
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'DescribeParametersResponse' 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', 'describeParametersResponse_nextToken' - An optional argument to pass in case the total number of records exceeds
-- the value of MaxResults. If nextToken is returned, there are more
-- results available. The value of nextToken is a unique pagination token
-- for each page. Make the call again using the returned token to retrieve
-- the next page. Keep all other arguments unchanged.
--
-- 'parameters', 'describeParametersResponse_parameters' - A list of parameters specific to a particular parameter group. Each
-- element in the list contains detailed information about one parameter.
--
-- 'httpStatus', 'describeParametersResponse_httpStatus' - The response's http status code.
newDescribeParametersResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  DescribeParametersResponse
newDescribeParametersResponse pHttpStatus_ =
  DescribeParametersResponse'
    { nextToken =
        Prelude.Nothing,
      parameters = Prelude.Nothing,
      httpStatus = pHttpStatus_
    }

-- | An optional argument to pass in case the total number of records exceeds
-- the value of MaxResults. If nextToken is returned, there are more
-- results available. The value of nextToken is a unique pagination token
-- for each page. Make the call again using the returned token to retrieve
-- the next page. Keep all other arguments unchanged.
describeParametersResponse_nextToken :: Lens.Lens' DescribeParametersResponse (Prelude.Maybe Prelude.Text)
describeParametersResponse_nextToken = Lens.lens (\DescribeParametersResponse' {nextToken} -> nextToken) (\s@DescribeParametersResponse' {} a -> s {nextToken = a} :: DescribeParametersResponse)

-- | A list of parameters specific to a particular parameter group. Each
-- element in the list contains detailed information about one parameter.
describeParametersResponse_parameters :: Lens.Lens' DescribeParametersResponse (Prelude.Maybe [Parameter])
describeParametersResponse_parameters = Lens.lens (\DescribeParametersResponse' {parameters} -> parameters) (\s@DescribeParametersResponse' {} a -> s {parameters = a} :: DescribeParametersResponse) Prelude.. Lens.mapping Lens.coerced

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

instance Prelude.NFData DescribeParametersResponse where
  rnf DescribeParametersResponse' {..} =
    Prelude.rnf nextToken
      `Prelude.seq` Prelude.rnf parameters
      `Prelude.seq` Prelude.rnf httpStatus