{-# 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.Glue.ListSchemas
-- 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 schemas with minimal details. Schemas in Deleting
-- status will not be included in the results. Empty results will be
-- returned if there are no schemas available.
--
-- When the @RegistryId@ is not provided, all the schemas across registries
-- will be part of the API response.
--
-- This operation returns paginated results.
module Amazonka.Glue.ListSchemas
  ( -- * Creating a Request
    ListSchemas (..),
    newListSchemas,

    -- * Request Lenses
    listSchemas_maxResults,
    listSchemas_nextToken,
    listSchemas_registryId,

    -- * Destructuring the Response
    ListSchemasResponse (..),
    newListSchemasResponse,

    -- * Response Lenses
    listSchemasResponse_nextToken,
    listSchemasResponse_schemas,
    listSchemasResponse_httpStatus,
  )
where

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

-- | /See:/ 'newListSchemas' smart constructor.
data ListSchemas = ListSchemas'
  { -- | Maximum number of results required per page. If the value is not
    -- supplied, this will be defaulted to 25 per page.
    maxResults :: Prelude.Maybe Prelude.Natural,
    -- | A continuation token, if this is a continuation call.
    nextToken :: Prelude.Maybe Prelude.Text,
    -- | A wrapper structure that may contain the registry name and Amazon
    -- Resource Name (ARN).
    registryId :: Prelude.Maybe RegistryId
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'ListSchemas' 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', 'listSchemas_maxResults' - Maximum number of results required per page. If the value is not
-- supplied, this will be defaulted to 25 per page.
--
-- 'nextToken', 'listSchemas_nextToken' - A continuation token, if this is a continuation call.
--
-- 'registryId', 'listSchemas_registryId' - A wrapper structure that may contain the registry name and Amazon
-- Resource Name (ARN).
newListSchemas ::
  ListSchemas
newListSchemas =
  ListSchemas'
    { maxResults = Prelude.Nothing,
      nextToken = Prelude.Nothing,
      registryId = Prelude.Nothing
    }

-- | Maximum number of results required per page. If the value is not
-- supplied, this will be defaulted to 25 per page.
listSchemas_maxResults :: Lens.Lens' ListSchemas (Prelude.Maybe Prelude.Natural)
listSchemas_maxResults = Lens.lens (\ListSchemas' {maxResults} -> maxResults) (\s@ListSchemas' {} a -> s {maxResults = a} :: ListSchemas)

-- | A continuation token, if this is a continuation call.
listSchemas_nextToken :: Lens.Lens' ListSchemas (Prelude.Maybe Prelude.Text)
listSchemas_nextToken = Lens.lens (\ListSchemas' {nextToken} -> nextToken) (\s@ListSchemas' {} a -> s {nextToken = a} :: ListSchemas)

-- | A wrapper structure that may contain the registry name and Amazon
-- Resource Name (ARN).
listSchemas_registryId :: Lens.Lens' ListSchemas (Prelude.Maybe RegistryId)
listSchemas_registryId = Lens.lens (\ListSchemas' {registryId} -> registryId) (\s@ListSchemas' {} a -> s {registryId = a} :: ListSchemas)

instance Core.AWSPager ListSchemas where
  page rq rs
    | Core.stop
        ( rs
            Lens.^? listSchemasResponse_nextToken
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Core.stop
        ( rs
            Lens.^? listSchemasResponse_schemas
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Prelude.otherwise =
        Prelude.Just
          Prelude.$ rq
          Prelude.& listSchemas_nextToken
          Lens..~ rs
          Lens.^? listSchemasResponse_nextToken
          Prelude.. Lens._Just

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

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

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

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

instance Data.ToJSON ListSchemas where
  toJSON ListSchemas' {..} =
    Data.object
      ( Prelude.catMaybes
          [ ("MaxResults" Data..=) Prelude.<$> maxResults,
            ("NextToken" Data..=) Prelude.<$> nextToken,
            ("RegistryId" Data..=) Prelude.<$> registryId
          ]
      )

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

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

-- | /See:/ 'newListSchemasResponse' smart constructor.
data ListSchemasResponse = ListSchemasResponse'
  { -- | A continuation token for paginating the returned list of tokens,
    -- returned if the current segment of the list is not the last.
    nextToken :: Prelude.Maybe Prelude.Text,
    -- | An array of @SchemaListItem@ objects containing details of each schema.
    schemas :: Prelude.Maybe [SchemaListItem],
    -- | The response's http status code.
    httpStatus :: Prelude.Int
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'ListSchemasResponse' 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', 'listSchemasResponse_nextToken' - A continuation token for paginating the returned list of tokens,
-- returned if the current segment of the list is not the last.
--
-- 'schemas', 'listSchemasResponse_schemas' - An array of @SchemaListItem@ objects containing details of each schema.
--
-- 'httpStatus', 'listSchemasResponse_httpStatus' - The response's http status code.
newListSchemasResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  ListSchemasResponse
newListSchemasResponse pHttpStatus_ =
  ListSchemasResponse'
    { nextToken = Prelude.Nothing,
      schemas = Prelude.Nothing,
      httpStatus = pHttpStatus_
    }

-- | A continuation token for paginating the returned list of tokens,
-- returned if the current segment of the list is not the last.
listSchemasResponse_nextToken :: Lens.Lens' ListSchemasResponse (Prelude.Maybe Prelude.Text)
listSchemasResponse_nextToken = Lens.lens (\ListSchemasResponse' {nextToken} -> nextToken) (\s@ListSchemasResponse' {} a -> s {nextToken = a} :: ListSchemasResponse)

-- | An array of @SchemaListItem@ objects containing details of each schema.
listSchemasResponse_schemas :: Lens.Lens' ListSchemasResponse (Prelude.Maybe [SchemaListItem])
listSchemasResponse_schemas = Lens.lens (\ListSchemasResponse' {schemas} -> schemas) (\s@ListSchemasResponse' {} a -> s {schemas = a} :: ListSchemasResponse) Prelude.. Lens.mapping Lens.coerced

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

instance Prelude.NFData ListSchemasResponse where
  rnf ListSchemasResponse' {..} =
    Prelude.rnf nextToken
      `Prelude.seq` Prelude.rnf schemas
      `Prelude.seq` Prelude.rnf httpStatus