/* 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.Linq.Expressions;
using System.Runtime.Serialization;

namespace OpenSearch.Client
{
	/// <summary>
	/// A suggester that suggests similar looking terms based on a provided text
	/// </summary>
	public interface ISuggester
	{
		/// <summary>
		/// The analyzer to analyse the suggest text with.
		/// Defaults to the search analyzer of the suggest field.
		/// </summary>
		[DataMember(Name ="analyzer")]
		string Analyzer { get; set; }

		/// <summary>
		/// The name of the field on which to run the query
		/// </summary>
		[DataMember(Name ="field")]
		Field Field { get; set; }

		/// <summary>
		/// The number of suggestions to return. Defaults to 5
		/// </summary>
		[DataMember(Name ="size")]
		int? Size { get; set; }
	}

	/// <inheritdoc />
	public abstract class SuggesterBase : ISuggester
	{
		/// <inheritdoc />
		public string Analyzer { get; set; }
		/// <inheritdoc />
		public Field Field { get; set; }
		/// <inheritdoc />
		public int? Size { get; set; }
	}

	/// <inheritdoc cref="ISuggester" />
	[DataContract]
	public abstract class SuggestDescriptorBase<TDescriptor, TInterface, T> : DescriptorBase<TDescriptor, TInterface>, ISuggester
		where TDescriptor : SuggestDescriptorBase<TDescriptor, TInterface, T>, TInterface, ISuggester
		where TInterface : class, ISuggester
	{
		string ISuggester.Analyzer { get; set; }
		Field ISuggester.Field { get; set; }

		int? ISuggester.Size { get; set; }

		/// <inheritdoc cref="ISuggester.Size" />
		public TDescriptor Size(int? size) => Assign(size, (a, v) => a.Size = v);

		/// <inheritdoc cref="ISuggester.Analyzer" />
		public TDescriptor Analyzer(string analyzer) => Assign(analyzer, (a, v) => a.Analyzer = v);

		/// <inheritdoc cref="ISuggester.Field" />
		public TDescriptor Field(Field field) => Assign(field, (a, v) => a.Field = v);

		/// <inheritdoc cref="ISuggester.Field" />
		public TDescriptor Field<TValue>(Expression<Func<T, TValue>> objectPath) => Assign(objectPath, (a, v) => a.Field = v);
	}
}