/* 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
*  under the License.
*/

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

namespace Tests.Mapping
{
	public class PropertyDescriptorTests
	{
		[U] public void IPropertiesDescriptorImplementsAllPropertyMethodsOfPropertiesDescriptor()
		{
			var concreteMethodNames =
				from m in typeof(PropertiesDescriptor<>).GetMethods()
				where m.Name != "Scalar"
				where m.ReturnType == typeof(PropertiesDescriptor<>)
				where m.IsGenericMethod == false
				let parameters = m.GetParameters()
				where parameters.Length > 0
				let firstParameter = parameters[0].ParameterType
				where firstParameter.IsConstructedGenericType
				where firstParameter.GetGenericTypeDefinition() == typeof(Func<,>)
				select m.Name;

			var interfaceMethodNames =
				from m in typeof(IPropertiesDescriptor<,>).GetMethods()
				where m.Name != "Scalar"
				where m.ReturnType == typeof(IPropertiesDescriptor<,>).GetGenericArguments()[1]
				where m.IsGenericMethod == false
				let parameters = m.GetParameters()
				where parameters.Length > 0
				let firstParameter = parameters[0].ParameterType
				where firstParameter.IsConstructedGenericType
				where firstParameter.GetGenericTypeDefinition() == typeof(Func<,>)
				select m.Name;

			concreteMethodNames.Except(interfaceMethodNames).Should().BeEmpty();
		}

		[U] public void IPropertiesDescriptorImplementsAPropertyMethodsForAllIPropertyTypes()
		{
			var selectorInterfaces =
				from m in typeof(PropertiesDescriptor<>).GetMethods()
				where m.Name != "Scalar"
				where m.ReturnType == typeof(PropertiesDescriptor<>)
				where m.IsGenericMethod == false
				let parameters = m.GetParameters()
				where parameters.Length > 0
				let firstParameter = parameters[0].ParameterType
				where firstParameter.IsConstructedGenericType
				where firstParameter.GetGenericTypeDefinition() == typeof(Func<,>)
				let selectorInterface = firstParameter.GetGenericArguments()[1]
				select selectorInterface;

			var exclude = new[]
			{
				typeof(IProperty),
				typeof(ICoreProperty),
				typeof(IDocValuesProperty),
			};

			var propertyTypes =
				from t in typeof(IProperty).Assembly.GetTypes()
				where typeof(IProperty).IsAssignableFrom(t)
				where t.IsInterface
				where !exclude.Contains(t)
				select t;

			selectorInterfaces.Except(propertyTypes).Should().BeEmpty();
		}
	}
}