/* 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.Collections.Generic;
using System.Runtime.Serialization;

namespace OpenSearch.Client
{
	public interface IMatrixAggregation : IAggregation
	{
		[DataMember(Name ="fields")]
		Fields Fields { get; set; }

		[DataMember(Name ="missing")]
		IDictionary<Field, double> Missing { get; set; }
	}

	public abstract class MatrixAggregationBase : AggregationBase, IMatrixAggregation
	{
		internal MatrixAggregationBase() { }

		protected MatrixAggregationBase(string name, Fields field) : base(name) => Fields = field;

		public Fields Fields { get; set; }

		public IDictionary<Field, double> Missing { get; set; }
	}

	public abstract class MatrixAggregationDescriptorBase<TMatrixAggregation, TMatrixAggregationInterface, T>
		: DescriptorBase<TMatrixAggregation, TMatrixAggregationInterface>, IMatrixAggregation
		where TMatrixAggregation : MatrixAggregationDescriptorBase<TMatrixAggregation, TMatrixAggregationInterface, T>
		, TMatrixAggregationInterface, IMatrixStatsAggregation
		where T : class
		where TMatrixAggregationInterface : class, IMatrixAggregation
	{
		Fields IMatrixAggregation.Fields { get; set; }

		IDictionary<string, object> IAggregation.Meta { get; set; }

		IDictionary<Field, double> IMatrixAggregation.Missing { get; set; }

		string IAggregation.Name { get; set; }

		public TMatrixAggregation Field(Fields fields) => Assign(fields, (a, v) => a.Fields = v);

		public TMatrixAggregation Fields(Func<FieldsDescriptor<T>, IPromise<Fields>> fields) =>
			Assign(fields, (a, v) => a.Fields = v?.Invoke(new FieldsDescriptor<T>())?.Value);

		public TMatrixAggregation Missing(Func<FluentDictionary<Field, double>, FluentDictionary<Field, double>> selector) =>
			Assign(selector, (a, v) => a.Missing = v?.Invoke(new FluentDictionary<Field, double>()));

		public TMatrixAggregation Meta(Func<FluentDictionary<string, object>, FluentDictionary<string, object>> selector) =>
			Assign(selector, (a, v) => a.Meta = v?.Invoke(new FluentDictionary<string, object>()));
	}
}