/* 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.Runtime.Serialization;
using OpenSearch.Net.Utf8Json;

namespace OpenSearch.Client
{
	[InterfaceDataContract]
	[JsonFormatter(typeof(ScoreFunctionJsonFormatter))]
	public interface IScoreFunction
	{
		[DataMember(Name ="filter")]
		QueryContainer Filter { get; set; }

		[DataMember(Name ="weight")]
		double? Weight { get; set; }
	}

	public class FunctionScoreFunction : FunctionScoreFunctionBase { }

	public abstract class FunctionScoreFunctionBase : IScoreFunction
	{
		public QueryContainer Filter { get; set; }
		public double? Weight { get; set; }
	}

	public class FunctionScoreFunctionDescriptor<T> : FunctionScoreFunctionDescriptorBase<FunctionScoreFunctionDescriptor<T>, IScoreFunction, T>
		where T : class { }

	public abstract class FunctionScoreFunctionDescriptorBase<TDescriptor, TInterface, T> : DescriptorBase<TDescriptor, TInterface>, IScoreFunction
		where TDescriptor : FunctionScoreFunctionDescriptorBase<TDescriptor, TInterface, T>, TInterface, IScoreFunction
		where TInterface : class, IScoreFunction
		where T : class
	{
		QueryContainer IScoreFunction.Filter { get; set; }

		double? IScoreFunction.Weight { get; set; }

		public TDescriptor Filter(Func<QueryContainerDescriptor<T>, QueryContainer> filterSelector) =>
			Assign(filterSelector, (a, v) => a.Filter = v?.Invoke(new QueryContainerDescriptor<T>()));

		public TDescriptor Weight(double? weight) => Assign(weight, (a, v) => a.Weight = v);
	}
}