/* 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
{
	[JsonFormatter(typeof(BucketsPathFormatter))]
	public interface IBucketsPath { }

	public class SingleBucketsPath : IBucketsPath
	{
		public SingleBucketsPath(string bucketsPath) => BucketsPath = bucketsPath;

		public string BucketsPath { get; }

		public static implicit operator SingleBucketsPath(string bucketsPath) => new SingleBucketsPath(bucketsPath);
	}

	public interface IMultiBucketsPath : IIsADictionary<string, string>, IBucketsPath { }

	public class MultiBucketsPath : IsADictionaryBase<string, string>, IMultiBucketsPath
	{
		public MultiBucketsPath() { }

		public MultiBucketsPath(IDictionary<string, string> container) : base(container) { }

		public MultiBucketsPath(Dictionary<string, string> container) : base(container) { }

		public void Add(string name, string bucketsPath) => BackingDictionary.Add(name, bucketsPath);

		public static implicit operator MultiBucketsPath(Dictionary<string, string> bucketsPath) => new MultiBucketsPath(bucketsPath);
	}

	public class MultiBucketsPathDescriptor
		: IsADictionaryDescriptorBase<MultiBucketsPathDescriptor, IMultiBucketsPath, string, string>
	{
		public MultiBucketsPathDescriptor() : base(new MultiBucketsPath()) { }

		public MultiBucketsPathDescriptor Add(string name, string bucketsPath) => Assign(name, bucketsPath);
	}

	internal class BucketsPathFormatter : IJsonFormatter<IBucketsPath>
	{
		public IBucketsPath Deserialize(ref JsonReader reader, IJsonFormatterResolver formatterResolver)
		{
			var token = reader.GetCurrentJsonToken();
			switch (token)
			{
				case JsonToken.String:
					return new SingleBucketsPath(reader.ReadString());
				case JsonToken.BeginObject:
					var formatter = formatterResolver.GetFormatter<Dictionary<string, string>>();
					var dict = formatter.Deserialize(ref reader, formatterResolver);
					return new MultiBucketsPath(dict);
				default:
					return null;
			}
		}

		public void Serialize(ref JsonWriter writer, IBucketsPath value, IJsonFormatterResolver formatterResolver)
		{
			if (value is SingleBucketsPath single)
				writer.WriteString(single.BucketsPath);
			else if (value is MultiBucketsPath multi)
			{
				writer.WriteBeginObject();
				var count = 0;
				foreach (var kv in multi)
				{
					if (count != 0)
						writer.WriteValueSeparator();
					writer.WritePropertyName(kv.Key);
					writer.WriteString(kv.Value);
					count++;
				}
				writer.WriteEndObject();
			}
			else
				writer.WriteNull();
		}
	}
}