/* 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.Concurrent;
using System.Reflection;
using System.Runtime.Serialization;

namespace OpenSearch.Client
{
	/// <summary>Determines how a POCO property maps to the property on a JSON object when serialized</summary>
	public interface IPropertyMapping
	{
		/// <summary>
		/// Ignores this property.
		/// <para>- When mapping automatically using <see cref="TypeMappingDescriptor{T}.AutoMap{TDocument}" /></para>
		/// <para>- When Indexing this type do not serialize this property and its value</para>
		/// </summary>
		bool Ignore { get; set; }

		/// <summary> Overrides the property name serialized to JSON for this property</summary>
		string Name { get; set; }
	}

	/// <inheritdoc />
	public class PropertyMapping : IPropertyMapping
	{
		public static PropertyMapping Ignored = new PropertyMapping { Ignore = true };

		/// <inheritdoc />
		public bool Ignore { get; set; }

		/// <inheritdoc />
		public string Name { get; set; }
	}

	/// <summary>
	/// Provides mappings for CLR types
	/// </summary>
	public interface IPropertyMappingProvider
	{
		/// <summary>
		/// Creates an <see cref="IPropertyMapping" /> for a <see cref="MemberInfo" />
		/// </summary>
		IPropertyMapping CreatePropertyMapping(MemberInfo memberInfo);
	}

	/// <inheritdoc />
	public class PropertyMappingProvider : IPropertyMappingProvider
	{
		protected readonly ConcurrentDictionary<string, IPropertyMapping> Properties = new ConcurrentDictionary<string, IPropertyMapping>();

		/// <inheritdoc />
		public virtual IPropertyMapping CreatePropertyMapping(MemberInfo memberInfo)
		{
			var memberInfoString = $"{memberInfo.DeclaringType?.FullName}.{memberInfo.Name}";
			if (Properties.TryGetValue(memberInfoString, out var mapping)) return mapping;

			mapping = PropertyMappingFromAttributes(memberInfo);
			Properties.TryAdd(memberInfoString, mapping);
			return mapping;
		}

		private static IPropertyMapping PropertyMappingFromAttributes(MemberInfo memberInfo)
		{
			var dataMemberProperty = memberInfo.GetCustomAttribute<DataMemberAttribute>(true);
			var propertyName = memberInfo.GetCustomAttribute<PropertyNameAttribute>(true);
			var ignore = memberInfo.GetCustomAttribute<IgnoreAttribute>(true);
			if (ignore == null && propertyName == null && dataMemberProperty == null) return null;

			return new PropertyMapping
			{
				Name = propertyName?.Name ?? dataMemberProperty?.Name,
				Ignore = ignore != null || propertyName != null && propertyName.Ignore
			};
		}
	}
}