/* 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;
using OpenSearch.Net.Utf8Json.Internal;
using OpenSearch.Net.Utf8Json.Resolvers;


namespace OpenSearch.Client
{
	internal class ScriptFormatter : IJsonFormatter<IScript>
	{
		private static readonly AutomataDictionary AutomataDictionary = new AutomataDictionary
		{
			{ "inline", 0 },
			{ "source", 1 },
			{ "id", 2 },
			{ "lang", 3 },
			{ "params", 4 }
		};

		public IScript Deserialize(ref JsonReader reader, IJsonFormatterResolver formatterResolver)
		{
			if (reader.GetCurrentJsonToken() != JsonToken.BeginObject)
			{
				reader.ReadNextBlock();
				return null;
			}

			var count = 0;
			IScript script = null;
			string language = null;
			Dictionary<string, object> parameters = null;

			while (reader.ReadIsInObject(ref count))
			{
				if (AutomataDictionary.TryGetValue(reader.ReadPropertyNameSegmentRaw(), out var value))
				{
					switch (value)
					{
						case 0:
						case 1:
							script = new InlineScript(reader.ReadString());
							break;
						case 2:
							script = new IndexedScript(reader.ReadString());
							break;
						case 3:
							language = reader.ReadString();
							break;
						case 4:
							parameters = formatterResolver.GetFormatter<Dictionary<string, object>>()
								.Deserialize(ref reader, formatterResolver);
							break;
					}
				}
			}

			if (script == null)
				return null;

			script.Lang = language;
			script.Params = parameters;
			return script;
		}

		public void Serialize(ref JsonWriter writer, IScript value, IJsonFormatterResolver formatterResolver)
		{
			if (value == null)
			{
				writer.WriteNull();
				return;
			}

			switch (value)
			{
				case IInlineScript inlineScript:
				{
					var formatter = formatterResolver.GetFormatter<IInlineScript>();
					formatter.Serialize(ref writer, inlineScript, formatterResolver);
					break;
				}
				case IIndexedScript indexedScript:
				{
					var formatter = formatterResolver.GetFormatter<IIndexedScript>();
					formatter.Serialize(ref writer, indexedScript, formatterResolver);
					break;
				}
				default:
				{
					var formatter = DynamicObjectResolver.ExcludeNullCamelCase.GetFormatter<IScript>();
					formatter.Serialize(ref writer, value, formatterResolver);
					break;
				}
			}
		}
	}
}