/* 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.Runtime.Serialization;
using OpenSearch.Net.Utf8Json;

namespace OpenSearch.Client
{
	[InterfaceDataContract]
	[ReadAs(typeof(RuntimeField))]
	public interface IRuntimeField
	{
		/// <summary>
		/// Runtime fields with a type of date can accept the format parameter exactly as the date field type.
		/// <see cref="DateFormat" />
		/// </summary>
		[DataMember(Name = "format")]
		string Format { get; set; }

		/// <summary>
		/// The script to be evaluated for field calculation at search time.
		/// </summary>
		[DataMember(Name = "script")]
		IStoredScript Script { get; set; }

		/// <summary>
		/// The datatype of the runtime field.
		/// </summary>
		[DataMember(Name = "type")]
		FieldType Type { get; set; }
	}

	public class RuntimeField : IRuntimeField
	{
		/// <inheritdoc />
		public string Format { get; set; }
		/// <inheritdoc />
		public IStoredScript Script { get; set; }
		/// <inheritdoc />
		public FieldType Type { get; set; }
	}

	public class RuntimeFieldDescriptor
		: DescriptorBase<RuntimeFieldDescriptor, IRuntimeField>, IRuntimeField
	{
		public RuntimeFieldDescriptor(FieldType fieldType) => Self.Type = fieldType;

		string IRuntimeField.Format { get; set; }
		IStoredScript IRuntimeField.Script { get; set; }
		FieldType IRuntimeField.Type { get; set; }

		public RuntimeFieldDescriptor Format(string format) => Assign(format, (a, v) => a.Format = v);

		public RuntimeFieldDescriptor Script(IStoredScript script) => Assign(script, (a, v) => a.Script = v);

		public RuntimeFieldDescriptor Script(string source) => Assign(source, (a, v) => a.Script = new PainlessScript(source));
	}
}