/* 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;

namespace OpenSearch.Client
{
	/// <summary>
	/// A values source that is equivalent to a simple terms aggregation.
	/// The values are extracted from a field or a script exactly like the terms aggregation.
	/// </summary>
	public interface ITermsCompositeAggregationSource : ICompositeAggregationSource
	{
		/// <summary>
		/// A script to create the values for the composite buckets
		/// </summary>
		[DataMember(Name ="script")]
		IScript Script { get; set; }
	}

	/// <inheritdoc cref="ITermsCompositeAggregationSource" />
	public class TermsCompositeAggregationSource : CompositeAggregationSourceBase, ITermsCompositeAggregationSource
	{
		public TermsCompositeAggregationSource(string name) : base(name) { }

		/// <inheritdoc />
		public IScript Script { get; set; }

		/// <inheritdoc />
		protected override string SourceType => "terms";
	}

	/// <inheritdoc cref="ITermsCompositeAggregationSource" />
	public class TermsCompositeAggregationSourceDescriptor<T>
		: CompositeAggregationSourceDescriptorBase<TermsCompositeAggregationSourceDescriptor<T>, ITermsCompositeAggregationSource, T>,
			ITermsCompositeAggregationSource
	{
		public TermsCompositeAggregationSourceDescriptor(string name) : base(name, "terms") { }

		IScript ITermsCompositeAggregationSource.Script { get; set; }

		/// <inheritdoc cref="ITermsCompositeAggregationSource.Script" />
		public TermsCompositeAggregationSourceDescriptor<T> Script(Func<ScriptDescriptor, IScript> selector) =>
			Assign(selector, (a, v) => a.Script = v?.Invoke(new ScriptDescriptor()));
	}
}