/* 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;
using OpenSearch.Net.Utf8Json;

namespace OpenSearch.Client
{
	internal class SuggestDictionaryFormatter<T> : IJsonFormatter<ISuggestDictionary<T>>
		where T : class
	{
		public ISuggestDictionary<T> Deserialize(ref JsonReader reader, IJsonFormatterResolver formatterResolver)
		{
			var formatter = formatterResolver.GetFormatter<Dictionary<string, ISuggest<T>[]>>();
			var dict = formatter.Deserialize(ref reader, formatterResolver);
			return new SuggestDictionary<T>(dict);
		}

		public void Serialize(ref JsonWriter writer, ISuggestDictionary<T> value, IJsonFormatterResolver formatterResolver)
		{
			var formatter = new VerbatimInterfaceReadOnlyDictionaryKeysFormatter<string, ISuggest<T>[]>();
			formatter.Serialize(ref writer, (SuggestDictionary<T>)value, formatterResolver);
		}
	}

	[JsonFormatter(typeof(SuggestDictionaryFormatter<>))]
	public interface ISuggestDictionary<out T>
		where T : class
	{
		ISuggest<T>[] this[string key] { get; }

		IEnumerable<string> Keys { get; }

		IEnumerable<ISuggest<T>[]> Values { get; }

		bool ContainsKey(string key);
	}


	public class SuggestDictionary<T> : IsAReadOnlyDictionaryBase<string, ISuggest<T>[]>, ISuggestDictionary<T>
		where T : class
	{
		[SerializationConstructor]
		public SuggestDictionary(IReadOnlyDictionary<string, ISuggest<T>[]> backingDictionary) : base(backingDictionary) { }

		public static SuggestDictionary<T> Default { get; } = new SuggestDictionary<T>(EmptyReadOnly<string, ISuggest<T>[]>.Dictionary);

		protected override string Sanitize(string key)
		{
			//typed_keys = true results in suggest keys being returned as "<type>#<name>"
			var hashIndex = key.IndexOf('#');
			return hashIndex > -1 ? key.Substring(hashIndex + 1) : key;
		}

	}
}