/* 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.Collections.Generic;
using System.Runtime.Serialization;
using OpenSearch.Net.Utf8Json;

namespace OpenSearch.Client
{
	[JsonFormatter(typeof(IncludeExcludeFormatter))]
	public class IncludeExclude
	{
		public IncludeExclude(string pattern) => Pattern = pattern;

		public IncludeExclude(IEnumerable<string> values) => Values = values;

		[IgnoreDataMember]
		public string Pattern { get; set; }

		[IgnoreDataMember]
		public IEnumerable<string> Values { get; set; }
	}

	internal class IncludeExcludeFormatter : IJsonFormatter<IncludeExclude>
	{
		public void Serialize(ref JsonWriter writer, IncludeExclude value, IJsonFormatterResolver formatterResolver)
		{
			if (value == null)
				writer.WriteNull();
			else if (value.Values != null)
			{
				var formatter = formatterResolver.GetFormatter<IEnumerable<string>>();
				formatter.Serialize(ref writer, value.Values, formatterResolver);
			}
			else
				writer.WriteString(value.Pattern);
		}

		public IncludeExclude Deserialize(ref JsonReader reader, IJsonFormatterResolver formatterResolver)
		{
			var token = reader.GetCurrentJsonToken();

			if (token == JsonToken.Null)
			{
				reader.ReadNext();
				return null;
			}

			IncludeExclude termsInclude;

			switch (token)
			{
				case JsonToken.BeginArray:
					var formatter = formatterResolver.GetFormatter<IEnumerable<string>>();
					termsInclude = new IncludeExclude(formatter.Deserialize(ref reader, formatterResolver));
					break;
				case JsonToken.String:
					termsInclude = new IncludeExclude(reader.ReadString());
					break;
				default:
					throw new Exception($"Unexpected token {token} when deserializing {nameof(IncludeExclude)}");
			}

			return termsInclude;
		}
	}
}