/* 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 OpenSearch.Net.Utf8Json;

namespace OpenSearch.Client
{
	[JsonFormatter(typeof(VerbatimDictionaryKeysFormatter<SuggestContainer, ISuggestContainer, string, ISuggestBucket>))]
	public interface ISuggestContainer : IIsADictionary<string, ISuggestBucket> { }

	public class SuggestContainer : IsADictionaryBase<string, ISuggestBucket>, ISuggestContainer
	{
		public SuggestContainer() { }

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

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

		public void Add(string name, ISuggestBucket script) => BackingDictionary.Add(name, script);
	}

	public class SuggestContainerDescriptor<T>
		: IsADictionaryDescriptorBase<SuggestContainerDescriptor<T>, ISuggestContainer, string, ISuggestBucket>
		where T : class
	{
		public SuggestContainerDescriptor() : base(new SuggestContainer()) { }

		private SuggestContainerDescriptor<T> AssignToBucket<TSuggester>(string name, TSuggester suggester, Action<SuggestBucket, TSuggester> assign)
			where TSuggester : ISuggester
		{
			var bucket = new SuggestBucket();
			assign(bucket, suggester);
			return Assign(name, bucket);
		}

		/// <inheritdoc cref="ITermSuggester"/>
		public SuggestContainerDescriptor<T> Term(string name, Func<TermSuggesterDescriptor<T>, ITermSuggester> suggest) =>
			AssignToBucket(name, suggest?.Invoke(new TermSuggesterDescriptor<T>()), (b, s) =>
			{
				b.Term = s;
				b.Text = s.Text;
			});

		/// <inheritdoc cref="IPhraseSuggester"/>
		public SuggestContainerDescriptor<T> Phrase(string name, Func<PhraseSuggesterDescriptor<T>, IPhraseSuggester> suggest) =>
			AssignToBucket(name, suggest?.Invoke(new PhraseSuggesterDescriptor<T>()), (b, s) =>
			{
				b.Phrase = s;
				b.Text = s.Text;
			});

		/// <summary>
		/// The completion suggester is a so-called prefix suggester.
		/// It does not do spell correction like the term or phrase suggesters but allows basic auto-complete functionality.
		/// </summary>
		public SuggestContainerDescriptor<T> Completion(string name, Func<CompletionSuggesterDescriptor<T>, ICompletionSuggester> suggest) =>
			AssignToBucket(name, suggest?.Invoke(new CompletionSuggesterDescriptor<T>()), (b, s) =>
			{
				b.Completion = s;
				b.Prefix = s.Prefix;
				b.Regex = s.Regex;
			});
	}
}