{-# 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.DescribeUsers
-- 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 a list of users.
--
-- This operation returns paginated results.
module Amazonka.MemoryDb.DescribeUsers
  ( -- * Creating a Request
    DescribeUsers (..),
    newDescribeUsers,

    -- * Request Lenses
    describeUsers_filters,
    describeUsers_maxResults,
    describeUsers_nextToken,
    describeUsers_userName,

    -- * Destructuring the Response
    DescribeUsersResponse (..),
    newDescribeUsersResponse,

    -- * Response Lenses
    describeUsersResponse_nextToken,
    describeUsersResponse_users,
    describeUsersResponse_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:/ 'newDescribeUsers' smart constructor.
data DescribeUsers = DescribeUsers'
  { -- | Filter to determine the list of users to return.
    filters :: Prelude.Maybe [Filter],
    -- | 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,
    -- | The name of the user
    userName :: Prelude.Maybe Prelude.Text
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'DescribeUsers' 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:
--
-- 'filters', 'describeUsers_filters' - Filter to determine the list of users to return.
--
-- 'maxResults', 'describeUsers_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', 'describeUsers_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.
--
-- 'userName', 'describeUsers_userName' - The name of the user
newDescribeUsers ::
  DescribeUsers
newDescribeUsers =
  DescribeUsers'
    { filters = Prelude.Nothing,
      maxResults = Prelude.Nothing,
      nextToken = Prelude.Nothing,
      userName = Prelude.Nothing
    }

-- | Filter to determine the list of users to return.
describeUsers_filters :: Lens.Lens' DescribeUsers (Prelude.Maybe [Filter])
describeUsers_filters = Lens.lens (\DescribeUsers' {filters} -> filters) (\s@DescribeUsers' {} a -> s {filters = a} :: DescribeUsers) Prelude.. Lens.mapping Lens.coerced

-- | 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.
describeUsers_maxResults :: Lens.Lens' DescribeUsers (Prelude.Maybe Prelude.Int)
describeUsers_maxResults = Lens.lens (\DescribeUsers' {maxResults} -> maxResults) (\s@DescribeUsers' {} a -> s {maxResults = a} :: DescribeUsers)

-- | 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.
describeUsers_nextToken :: Lens.Lens' DescribeUsers (Prelude.Maybe Prelude.Text)
describeUsers_nextToken = Lens.lens (\DescribeUsers' {nextToken} -> nextToken) (\s@DescribeUsers' {} a -> s {nextToken = a} :: DescribeUsers)

-- | The name of the user
describeUsers_userName :: Lens.Lens' DescribeUsers (Prelude.Maybe Prelude.Text)
describeUsers_userName = Lens.lens (\DescribeUsers' {userName} -> userName) (\s@DescribeUsers' {} a -> s {userName = a} :: DescribeUsers)

instance Core.AWSPager DescribeUsers where
  page rq rs
    | Core.stop
        ( rs
            Lens.^? describeUsersResponse_nextToken
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Core.stop
        ( rs
            Lens.^? describeUsersResponse_users
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Prelude.otherwise =
        Prelude.Just
          Prelude.$ rq
          Prelude.& describeUsers_nextToken
          Lens..~ rs
          Lens.^? describeUsersResponse_nextToken
          Prelude.. Lens._Just

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

instance Prelude.Hashable DescribeUsers where
  hashWithSalt _salt DescribeUsers' {..} =
    _salt
      `Prelude.hashWithSalt` filters
      `Prelude.hashWithSalt` maxResults
      `Prelude.hashWithSalt` nextToken
      `Prelude.hashWithSalt` userName

instance Prelude.NFData DescribeUsers where
  rnf DescribeUsers' {..} =
    Prelude.rnf filters
      `Prelude.seq` Prelude.rnf maxResults
      `Prelude.seq` Prelude.rnf nextToken
      `Prelude.seq` Prelude.rnf userName

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

instance Data.ToJSON DescribeUsers where
  toJSON DescribeUsers' {..} =
    Data.object
      ( Prelude.catMaybes
          [ ("Filters" Data..=) Prelude.<$> filters,
            ("MaxResults" Data..=) Prelude.<$> maxResults,
            ("NextToken" Data..=) Prelude.<$> nextToken,
            ("UserName" Data..=) Prelude.<$> userName
          ]
      )

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

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

-- | /See:/ 'newDescribeUsersResponse' smart constructor.
data DescribeUsersResponse = DescribeUsersResponse'
  { -- | 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 users.
    users :: Prelude.Maybe [User],
    -- | The response's http status code.
    httpStatus :: Prelude.Int
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'DescribeUsersResponse' 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', 'describeUsersResponse_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.
--
-- 'users', 'describeUsersResponse_users' - A list of users.
--
-- 'httpStatus', 'describeUsersResponse_httpStatus' - The response's http status code.
newDescribeUsersResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  DescribeUsersResponse
newDescribeUsersResponse pHttpStatus_ =
  DescribeUsersResponse'
    { nextToken = Prelude.Nothing,
      users = 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.
describeUsersResponse_nextToken :: Lens.Lens' DescribeUsersResponse (Prelude.Maybe Prelude.Text)
describeUsersResponse_nextToken = Lens.lens (\DescribeUsersResponse' {nextToken} -> nextToken) (\s@DescribeUsersResponse' {} a -> s {nextToken = a} :: DescribeUsersResponse)

-- | A list of users.
describeUsersResponse_users :: Lens.Lens' DescribeUsersResponse (Prelude.Maybe [User])
describeUsersResponse_users = Lens.lens (\DescribeUsersResponse' {users} -> users) (\s@DescribeUsersResponse' {} a -> s {users = a} :: DescribeUsersResponse) Prelude.. Lens.mapping Lens.coerced

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

instance Prelude.NFData DescribeUsersResponse where
  rnf DescribeUsersResponse' {..} =
    Prelude.rnf nextToken
      `Prelude.seq` Prelude.rnf users
      `Prelude.seq` Prelude.rnf httpStatus