/* 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;
using OpenSearch.Net.Utf8Json;

namespace OpenSearch.Client
{
	/// <summary>
	/// An analyzer of type standard that is built of using Standard Tokenizer, with Standard Token Filter, Lower Case Token Filter, and Stop Token
	/// Filter.
	/// </summary>
	public interface IStandardAnalyzer : IAnalyzer
	{
		/// <summary>
		/// The maximum token length. If a token is seen that exceeds this length then it is discarded. Defaults to 255.
		/// </summary>
		[DataMember(Name ="max_token_length")]
		[JsonFormatter(typeof(NullableStringIntFormatter))]
		int? MaxTokenLength { get; set; }

		/// <summary>
		/// A list of stopword to initialize the stop filter with. Defaults to the english stop words.
		/// </summary>
		[DataMember(Name ="stopwords")]
		StopWords StopWords { get; set; }
	}

	/// <inheritdoc />
	public class StandardAnalyzer : AnalyzerBase, IStandardAnalyzer
	{
		public StandardAnalyzer() : base("standard") { }

		/// <inheritdoc />
		public int? MaxTokenLength { get; set; }

		/// <inheritdoc />
		public StopWords StopWords { get; set; }
	}

	/// <inheritdoc />
	public class StandardAnalyzerDescriptor : AnalyzerDescriptorBase<StandardAnalyzerDescriptor, IStandardAnalyzer>, IStandardAnalyzer
	{
		protected override string Type => "standard";
		int? IStandardAnalyzer.MaxTokenLength { get; set; }

		StopWords IStandardAnalyzer.StopWords { get; set; }

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

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

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

		public StandardAnalyzerDescriptor MaxTokenLength(int? maxTokenLength) =>
			Assign(maxTokenLength, (a, v) => a.MaxTokenLength = v);
	}
}