{-# 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.QLDB.ListLedgers
-- 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 an array of ledger summaries that are associated with the
-- current Amazon Web Services account and Region.
--
-- This action returns a maximum of 100 items and is paginated so that you
-- can retrieve all the items by calling @ListLedgers@ multiple times.
module Amazonka.QLDB.ListLedgers
  ( -- * Creating a Request
    ListLedgers (..),
    newListLedgers,

    -- * Request Lenses
    listLedgers_maxResults,
    listLedgers_nextToken,

    -- * Destructuring the Response
    ListLedgersResponse (..),
    newListLedgersResponse,

    -- * Response Lenses
    listLedgersResponse_ledgers,
    listLedgersResponse_nextToken,
    listLedgersResponse_httpStatus,
  )
where

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 Amazonka.QLDB.Types
import qualified Amazonka.Request as Request
import qualified Amazonka.Response as Response

-- | /See:/ 'newListLedgers' smart constructor.
data ListLedgers = ListLedgers'
  { -- | The maximum number of results to return in a single @ListLedgers@
    -- request. (The actual number of results returned might be fewer.)
    maxResults :: Prelude.Maybe Prelude.Natural,
    -- | A pagination token, indicating that you want to retrieve the next page
    -- of results. If you received a value for @NextToken@ in the response from
    -- a previous @ListLedgers@ call, then you should use that value as input
    -- here.
    nextToken :: Prelude.Maybe Prelude.Text
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'ListLedgers' 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', 'listLedgers_maxResults' - The maximum number of results to return in a single @ListLedgers@
-- request. (The actual number of results returned might be fewer.)
--
-- 'nextToken', 'listLedgers_nextToken' - A pagination token, indicating that you want to retrieve the next page
-- of results. If you received a value for @NextToken@ in the response from
-- a previous @ListLedgers@ call, then you should use that value as input
-- here.
newListLedgers ::
  ListLedgers
newListLedgers =
  ListLedgers'
    { maxResults = Prelude.Nothing,
      nextToken = Prelude.Nothing
    }

-- | The maximum number of results to return in a single @ListLedgers@
-- request. (The actual number of results returned might be fewer.)
listLedgers_maxResults :: Lens.Lens' ListLedgers (Prelude.Maybe Prelude.Natural)
listLedgers_maxResults = Lens.lens (\ListLedgers' {maxResults} -> maxResults) (\s@ListLedgers' {} a -> s {maxResults = a} :: ListLedgers)

-- | A pagination token, indicating that you want to retrieve the next page
-- of results. If you received a value for @NextToken@ in the response from
-- a previous @ListLedgers@ call, then you should use that value as input
-- here.
listLedgers_nextToken :: Lens.Lens' ListLedgers (Prelude.Maybe Prelude.Text)
listLedgers_nextToken = Lens.lens (\ListLedgers' {nextToken} -> nextToken) (\s@ListLedgers' {} a -> s {nextToken = a} :: ListLedgers)

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

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

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

instance Data.ToHeaders ListLedgers where
  toHeaders =
    Prelude.const
      ( Prelude.mconcat
          [ "Content-Type"
              Data.=# ( "application/x-amz-json-1.0" ::
                          Prelude.ByteString
                      )
          ]
      )

instance Data.ToPath ListLedgers where
  toPath = Prelude.const "/ledgers"

instance Data.ToQuery ListLedgers where
  toQuery ListLedgers' {..} =
    Prelude.mconcat
      [ "max_results" Data.=: maxResults,
        "next_token" Data.=: nextToken
      ]

-- | /See:/ 'newListLedgersResponse' smart constructor.
data ListLedgersResponse = ListLedgersResponse'
  { -- | The array of ledger summaries that are associated with the current
    -- Amazon Web Services account and Region.
    ledgers :: Prelude.Maybe [LedgerSummary],
    -- | A pagination token, indicating whether there are more results available:
    --
    -- -   If @NextToken@ is empty, then the last page of results has been
    --     processed and there are no more results to be retrieved.
    --
    -- -   If @NextToken@ is /not/ empty, then there are more results
    --     available. To retrieve the next page of results, use the value of
    --     @NextToken@ in a subsequent @ListLedgers@ call.
    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 'ListLedgersResponse' 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:
--
-- 'ledgers', 'listLedgersResponse_ledgers' - The array of ledger summaries that are associated with the current
-- Amazon Web Services account and Region.
--
-- 'nextToken', 'listLedgersResponse_nextToken' - A pagination token, indicating whether there are more results available:
--
-- -   If @NextToken@ is empty, then the last page of results has been
--     processed and there are no more results to be retrieved.
--
-- -   If @NextToken@ is /not/ empty, then there are more results
--     available. To retrieve the next page of results, use the value of
--     @NextToken@ in a subsequent @ListLedgers@ call.
--
-- 'httpStatus', 'listLedgersResponse_httpStatus' - The response's http status code.
newListLedgersResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  ListLedgersResponse
newListLedgersResponse pHttpStatus_ =
  ListLedgersResponse'
    { ledgers = Prelude.Nothing,
      nextToken = Prelude.Nothing,
      httpStatus = pHttpStatus_
    }

-- | The array of ledger summaries that are associated with the current
-- Amazon Web Services account and Region.
listLedgersResponse_ledgers :: Lens.Lens' ListLedgersResponse (Prelude.Maybe [LedgerSummary])
listLedgersResponse_ledgers = Lens.lens (\ListLedgersResponse' {ledgers} -> ledgers) (\s@ListLedgersResponse' {} a -> s {ledgers = a} :: ListLedgersResponse) Prelude.. Lens.mapping Lens.coerced

-- | A pagination token, indicating whether there are more results available:
--
-- -   If @NextToken@ is empty, then the last page of results has been
--     processed and there are no more results to be retrieved.
--
-- -   If @NextToken@ is /not/ empty, then there are more results
--     available. To retrieve the next page of results, use the value of
--     @NextToken@ in a subsequent @ListLedgers@ call.
listLedgersResponse_nextToken :: Lens.Lens' ListLedgersResponse (Prelude.Maybe Prelude.Text)
listLedgersResponse_nextToken = Lens.lens (\ListLedgersResponse' {nextToken} -> nextToken) (\s@ListLedgersResponse' {} a -> s {nextToken = a} :: ListLedgersResponse)

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

instance Prelude.NFData ListLedgersResponse where
  rnf ListLedgersResponse' {..} =
    Prelude.rnf ledgers
      `Prelude.seq` Prelude.rnf nextToken
      `Prelude.seq` Prelude.rnf httpStatus