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

namespace OpenSearch.Client
{
	/// <summary>
	/// An analyzer of type snowball that uses the standard tokenizer, with standard filter, lowercase filter, stop filter, and snowball filter.
	/// <para>
	/// The Snowball Analyzer is a stemming analyzer from Lucene that is originally based on the snowball project from
	/// snowball.tartarus.org.
	/// </para>
	/// </summary>
	public interface ISnowballAnalyzer : IAnalyzer
	{
		[DataMember(Name ="language")]
		SnowballLanguage? Language { get; set; }

		[DataMember(Name ="stopwords")]
		StopWords StopWords { get; set; }
	}

	/// <inheritdoc />
	public class SnowballAnalyzer : AnalyzerBase, ISnowballAnalyzer
	{
		public SnowballAnalyzer() : base("snowball") { }

		public SnowballLanguage? Language { get; set; }

		public StopWords StopWords { get; set; }
	}

	/// <inheritdoc />
	public class SnowballAnalyzerDescriptor : AnalyzerDescriptorBase<SnowballAnalyzerDescriptor, ISnowballAnalyzer>, ISnowballAnalyzer
	{
		protected override string Type => "snowball";
		SnowballLanguage? ISnowballAnalyzer.Language { get; set; }

		StopWords ISnowballAnalyzer.StopWords { get; set; }

		public SnowballAnalyzerDescriptor StopWords(StopWords stopWords) => Assign(stopWords, (a, v) => a.StopWords = v);

		public SnowballAnalyzerDescriptor StopWords(IEnumerable<string> stopWords) => Assign(stopWords.ToListOrNullIfEmpty(), (a, v) => a.StopWords = v);

		public SnowballAnalyzerDescriptor StopWords(params string[] stopWords) => Assign(stopWords.ToListOrNullIfEmpty(), (a, v) => a.StopWords = v);

		public SnowballAnalyzerDescriptor Language(SnowballLanguage? language) => Assign(language, (a, v) => a.Language = v);
	}
}