/* 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.Runtime.Serialization;
using OpenSearch.Net.Utf8Json;

namespace OpenSearch.Client
{
	/// <summary>
	/// The unique token filter can be used to only index unique tokens during analysis. By default it is applied on all the
	/// token stream
	/// </summary>
	public interface IUniqueTokenFilter : ITokenFilter
	{
		/// <summary>
		///  If only_on_same_position is set to true, it will only remove duplicate tokens on the same position.
		/// </summary>
		[DataMember(Name = "only_on_same_position")]
		[JsonFormatter(typeof(NullableStringBooleanFormatter))]
		bool? OnlyOnSamePosition { get; set; }
	}

	/// <inheritdoc />
	public class UniqueTokenFilter : TokenFilterBase, IUniqueTokenFilter
	{
		public UniqueTokenFilter() : base("unique") { }

		/// <inheritdoc />
		public bool? OnlyOnSamePosition { get; set; }
	}

	/// <inheritdoc />
	public class UniqueTokenFilterDescriptor
		: TokenFilterDescriptorBase<UniqueTokenFilterDescriptor, IUniqueTokenFilter>, IUniqueTokenFilter
	{
		protected override string Type => "unique";

		bool? IUniqueTokenFilter.OnlyOnSamePosition { get; set; }

		/// <inheritdoc />
		public UniqueTokenFilterDescriptor OnlyOnSamePosition(bool? samePositionOnly = true) => Assign(samePositionOnly, (a, v) => a.OnlyOnSamePosition = v);
	}
}