/* 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
*  license agreements. See the NOTICE file distributed with
*  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
*
*  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
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*/

using System.Linq;
using System.Reflection;
using OpenSearch.OpenSearch.Xunit.XunitPlumbing;
using FluentAssertions;
using OpenSearch.Client;

namespace Tests.Aggregations
{
	public class AggregationVisitorTests
	{
		[U] public void VisitMethodForEachTypeOfAggregation()
		{
			// exclude intermediate aggregations
			var exclude = new[]
			{
				typeof(IMetricAggregation), typeof(IBucketAggregation), typeof(IPipelineAggregation), typeof(IMatrixAggregation),
				typeof(IFormattableMetricAggregation)
			};

			var aggregationTypes =
				(from t in typeof(IAggregation).Assembly.Types()
				where typeof(IAggregation).IsAssignableFrom(t)
				where t.IsInterface && !exclude.Contains(t)
				select t).ToList();

			var visitorMethodParameters =
				(from m in typeof(IAggregationVisitor).GetMethods()
				where m.Name == "Visit"
				let aggregationInterface = m.GetParameters().First().ParameterType
				where aggregationInterface != typeof(IAggregationContainer)
				select aggregationInterface).ToList();

			if (aggregationTypes.Count < visitorMethodParameters.Count)
				visitorMethodParameters.Except(aggregationTypes).Should().BeEmpty();
			else
				aggregationTypes.Except(visitorMethodParameters).Should().BeEmpty();
		}
	}
}