/* 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;
using OpenSearch.Net.Utf8Json;


namespace OpenSearch.Client.Specification.IngestApi
{
	/// <summary>
	/// Converts a field in the currently ingested document to a different type,
	/// such as converting a string to an integer.
	/// If the field value is an array, all members will be converted.
	/// </summary>
	[InterfaceDataContract]
	public interface IConvertProcessor : IProcessor
	{
		/// <summary>
		/// The field whose value is to be converted
		/// </summary>
		[DataMember(Name ="field")]
		Field Field { get; set; }

		/// <summary>
		/// The field to assign the converted value to, by default field is updated in-place
		/// </summary>
		[DataMember(Name ="target_field")]
		Field TargetField { get; set; }

		/// <summary>
		/// The type to convert the existing value to
		/// </summary>
		[DataMember(Name ="type")]
		ConvertProcessorType? Type { get; set; }

		/// <summary>
		/// If <c>true</c> and <see cref="Field" /> does not exist or is null,
		/// the processor quietly exits without modifying the document. Default is <c>false</c>
		/// </summary>
		[DataMember(Name = "ignore_missing")]
		bool? IgnoreMissing { get; set; }
	}

	public class ConvertProcessor : ProcessorBase, IConvertProcessor
	{
		/// <inheritdoc />
		public Field Field { get; set; }
		/// <inheritdoc />
		public Field TargetField { get; set; }
		/// <inheritdoc />
		public ConvertProcessorType? Type { get; set; }
		/// <inheritdoc />
		public bool? IgnoreMissing { get; set; }
		/// <inheritdoc />
		protected override string Name => "convert";
	}

	public class ConvertProcessorDescriptor<T> : ProcessorDescriptorBase<ConvertProcessorDescriptor<T>, IConvertProcessor>, IConvertProcessor
		where T : class
	{
		protected override string Name => "convert";
		Field IConvertProcessor.Field { get; set; }
		Field IConvertProcessor.TargetField { get; set; }
		bool? IConvertProcessor.IgnoreMissing { get; set; }
		ConvertProcessorType? IConvertProcessor.Type { get; set; }

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

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

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

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

		/// <inheritdoc cref="IConvertProcessor.Type" />
		public ConvertProcessorDescriptor<T> Type(ConvertProcessorType? type) => Assign(type, (a, v) => a.Type = v);

		/// <inheritdoc cref="IConvertProcessor.IgnoreMissing" />
		public ConvertProcessorDescriptor<T> IgnoreMissing(bool? ignoreMissing = true) => Assign(ignoreMissing, (a, v) => a.IgnoreMissing = v);
	}

	[StringEnum]
	public enum ConvertProcessorType
	{
		[EnumMember(Value = "integer")]
		Integer,

		[EnumMember(Value = "long")]
		Long,

		[EnumMember(Value = "float")]
		Float,

		[EnumMember(Value = "double")]
		Double,

		[EnumMember(Value = "string")]
		String,

		[EnumMember(Value = "boolean")]
		Boolean,

		[EnumMember(Value = "auto")]
		Auto
	}
}