/* 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;

namespace OpenSearch.Client
{
	public interface IBucketAggregation : IAggregation
	{
		AggregationDictionary Aggregations { get; set; }
	}

	public abstract class BucketAggregationBase : AggregationBase, IBucketAggregation
	{
		internal BucketAggregationBase() { }

		protected BucketAggregationBase(string name) : base(name) { }

		public AggregationDictionary Aggregations { get; set; }
	}

	public abstract class BucketAggregationDescriptorBase<TBucketAggregation, TBucketAggregationInterface, T>
		: IBucketAggregation, IDescriptor
		where TBucketAggregation : BucketAggregationDescriptorBase<TBucketAggregation, TBucketAggregationInterface, T>
		, TBucketAggregationInterface, IBucketAggregation
		where T : class
		where TBucketAggregationInterface : class, IBucketAggregation
	{
		protected TBucketAggregationInterface Self => (TBucketAggregation)this;
		AggregationDictionary IBucketAggregation.Aggregations { get; set; }

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

		string IAggregation.Name { get; set; }

		protected TBucketAggregation Assign<TValue>(TValue value, Action<TBucketAggregationInterface, TValue> assigner) =>
			Fluent.Assign((TBucketAggregation)this, value, assigner);

		public TBucketAggregation Aggregations(Func<AggregationContainerDescriptor<T>, IAggregationContainer> selector) =>
			Assign(selector, (a, v) => a.Aggregations = v?.Invoke(new AggregationContainerDescriptor<T>())?.Aggregations);

		public TBucketAggregation Aggregations(AggregationDictionary aggregations) =>
			Assign(aggregations, (a, v) => a.Aggregations = v);

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