/*
 * Copyright (C) 2023 Amazon.com, Inc. or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { defaultProvider } from '@aws-sdk/credential-provider-node';
import { Client } from '@opensearch-project/opensearch';
import { AwsSigv4Signer } from '@opensearch-project/opensearch/aws';

/**
 * @param endpoint The OpenSearch endpoint.
 * @param region The AWS region in which OpenSearch is deployed.
 * @returns a new instance of a configured OpenSearch client.
 */
export const createOpenSearchClient = (
  endpoint: string,
  region: string = process.env.AWS_REGION!
): Client => {
  return (new Client({
    ...AwsSigv4Signer({
      region: region,
      service: 'es',
      getCredentials: () => {
        const credentialsProvider = defaultProvider();
        return credentialsProvider();
      }
    }),
    node: endpoint
  }));
};