/* SPDX-License-Identifier: Apache-2.0
*
* The OpenSearch Contributors require contributions made to
* this file be licensed under the Apache-2.0 license or a
* compatible open source license.
*/
/*
* Modifications Copyright OpenSearch Contributors. See
* GitHub history for details.
*
*  Licensed to Elasticsearch B.V. under one or more contributor
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*  this work for additional information regarding copyright
*  ownership. Elasticsearch B.V. licenses this file to you 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
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using System;
using System.Threading;
using OpenSearch.OpenSearch.Xunit.XunitPlumbing;
using FluentAssertions;
using OpenSearch.Client;
using Tests.Core.ManagedOpenSearch.Clusters;
using Tests.Core.Xunit;

namespace Tests.Document.Multiple.BulkAll
{
	public class BulkAllDisposeApiTests : BulkAllApiTestsBase
	{
		public BulkAllDisposeApiTests(IntrusiveOperationCluster cluster) : base(cluster) { }

		[I] [SkipOnCi]
		public void DisposingObservableCancelsBulkAll()
		{
			var index = CreateIndexName();
			var handle = new ManualResetEvent(false);

			var size = 1000;
			var pages = 1000;
			var seenPages = 0;
			var numberOfDocuments = size * pages;
			var documents = CreateLazyStreamOfDocuments(numberOfDocuments);

			//first we setup our cold observable
			var observableBulk = Client.BulkAll(documents, f => f
				.MaxDegreeOfParallelism(8)
				.BackOffTime(TimeSpan.FromSeconds(10))
				.BackOffRetries(2)
				.Size(size)
				.RefreshOnCompleted()
				.Index(index)
			);
			//we set up an observer
			Exception ex = null;
			var bulkObserver = new BulkAllObserver(
				onError: (e) => OnError(ref ex, e, handle),
				onCompleted: () => handle.Set(),
				onNext: (b) => Interlocked.Increment(ref seenPages)
			);

			//when we subscribe the observable becomes hot
			observableBulk.Subscribe(bulkObserver);

			//we wait N seconds to see some bulks
			handle.WaitOne(TimeSpan.FromSeconds(3));
			observableBulk.Dispose();
			//we wait N seconds to give in flight request a chance to cancel
			handle.WaitOne(TimeSpan.FromSeconds(3));

			if (ex != null && !(ex is OperationCanceledException)) throw ex;

			seenPages.Should().BeLessThan(pages).And.BeGreaterThan(0);
			var count = Client.Count<SmallObject>(f => f.Index(index));
			count.Count.Should().BeLessThan(numberOfDocuments).And.BeGreaterThan(0);
			bulkObserver.TotalNumberOfFailedBuffers.Should().Be(0);
		}
	}
}