/* 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 OpenSearch.Net.Utf8Json;

namespace OpenSearch.Client
{
	internal class IndicesBoostFormatter : IJsonFormatter<IDictionary<IndexName, double>>
	{
		public void Serialize(ref JsonWriter writer, IDictionary<IndexName, double> value, IJsonFormatterResolver formatterResolver)
		{
			if (value == null)
			{
				writer.WriteNull();
				return;
			}

			var settings = formatterResolver.GetConnectionSettings();
			writer.WriteBeginArray();
			var count = 0;
			foreach (var entry in value)
			{
				if (count > 0)
					writer.WriteValueSeparator();
				writer.WriteBeginObject();
				var indexName = settings.Inferrer.IndexName(entry.Key);
				writer.WritePropertyName(indexName);
				writer.WriteDouble(entry.Value);
				writer.WriteEndObject();
				count++;
			}
			writer.WriteEndArray();
		}

		public IDictionary<IndexName, double> Deserialize(ref JsonReader reader, IJsonFormatterResolver formatterResolver)
		{
			var token = reader.GetCurrentJsonToken();
			switch (token)
			{
				case JsonToken.BeginObject:
					return formatterResolver.GetFormatter<Dictionary<IndexName, double>>()
						.Deserialize(ref reader, formatterResolver);
				case JsonToken.BeginArray:
					var dictionary = new Dictionary<IndexName, double>();
					var count = 0;
					var indexNameFormatter = formatterResolver.GetFormatter<IndexName>();
					while (reader.ReadIsInArray(ref count))
					{
						reader.ReadIsBeginObjectWithVerify();
						var indexName = indexNameFormatter.Deserialize(ref reader, formatterResolver);
						reader.ReadIsNameSeparatorWithVerify();
						dictionary.Add(indexName, reader.ReadDouble());
						reader.ReadIsEndObjectWithVerify();
					}
					return dictionary;
				default:
					reader.ReadNextBlock();
					return null;
			}
		}
	}
}