/* 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.Linq.Expressions;
using System.Runtime.Serialization;
using OpenSearch.Net.Utf8Json;

namespace OpenSearch.Client.Specification.IngestApi
{
	/// <summary>
	/// Converts a JSON string into a structured JSON object.
	/// </summary>
	[InterfaceDataContract]
	public interface IJsonProcessor : IProcessor
	{
		/// <summary>
		/// Flag that forces the serialized json to be injected into the top level of the document.
		/// <see cref="TargetField" /> must not be set when this option is chosen.
		/// </summary>
		[DataMember(Name ="add_to_root")]
		bool? AddToRoot { get; set; }

		/// <summary>
		/// Field holding json as a string
		/// </summary>
		[DataMember(Name ="field")]
		Field Field { get; set; }

		/// <summary>
		/// The field to insert the converted structured object into
		/// </summary>
		[DataMember(Name ="target_field")]
		Field TargetField { get; set; }
	}

	/// <inheritdoc cref="IJsonProcessor" />
	public class JsonProcessor : ProcessorBase, IJsonProcessor
	{
		/// <inheritdoc />
		public bool? AddToRoot { get; set; }

		/// <inheritdoc />
		public Field Field { get; set; }

		/// <inheritdoc />
		public Field TargetField { get; set; }

		protected override string Name => "json";
	}

	/// <inheritdoc cref="IJsonProcessor" />
	public class JsonProcessorDescriptor<T>
		: ProcessorDescriptorBase<JsonProcessorDescriptor<T>, IJsonProcessor>, IJsonProcessor
		where T : class
	{
		protected override string Name => "json";
		bool? IJsonProcessor.AddToRoot { get; set; }

		Field IJsonProcessor.Field { get; set; }
		Field IJsonProcessor.TargetField { get; set; }

		/// <inheritdoc cref="IJsonProcessor.Field" />
		public JsonProcessorDescriptor<T> Field(Field field) => Assign(field, (a, v) => a.Field = v);

		/// <inheritdoc cref="IJsonProcessor.Field" />
		public JsonProcessorDescriptor<T> Field<TValue>(Expression<Func<T, TValue>> objectPath) =>
			Assign(objectPath, (a, v) => a.Field = v);

		/// <inheritdoc cref="IJsonProcessor.TargetField" />
		public JsonProcessorDescriptor<T> TargetField(Field field) => Assign(field, (a, v) => a.TargetField = v);

		/// <inheritdoc cref="IJsonProcessor.TargetField" />
		public JsonProcessorDescriptor<T> TargetField<TValue>(Expression<Func<T, TValue>> objectPath) =>
			Assign(objectPath, (a, v) => a.TargetField = v);

		/// <inheritdoc cref="IJsonProcessor.AddToRoot" />
		public JsonProcessorDescriptor<T> AddToRoot(bool? addToRoot = true) => Assign(addToRoot, (a, v) => a.AddToRoot = v);
	}
}