/* 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.Diagnostics;
using System.Linq.Expressions;
using System.Reflection;
using OpenSearch.Net;
using OpenSearch.Net.Utf8Json;

namespace OpenSearch.Client
{
	[JsonFormatter(typeof(PropertyNameFormatter))]
	[DebuggerDisplay("{DebugDisplay,nq}")]
	public class PropertyName : IEquatable<PropertyName>, IUrlParameter
	{
		private readonly object _comparisonValue;
		private readonly Type _type;

		public PropertyName(string name)
		{
			Name = name;
			_comparisonValue = name;
		}

		public PropertyName(Expression expression)
		{
			Expression = expression;
			_comparisonValue = expression.ComparisonValueFromExpression(out var type, out var cachable);
			CacheableExpression = cachable;
			_type = type;
		}

		public PropertyName(PropertyInfo property)
		{
			Property = property;
			_comparisonValue = property;
			_type = property.DeclaringType;
		}

		public bool CacheableExpression { get; }
		public Expression Expression { get; }

		public string Name { get; }
		public PropertyInfo Property { get; }

		internal string DebugDisplay =>
			$"{Expression?.ToString() ?? PropertyDebug ?? Name}{(_type == null ? "" : " typeof: " + _type.Name)}";

		public override string ToString() => DebugDisplay;

		private string PropertyDebug => Property == null ? null : $"PropertyInfo: {Property.Name}";
		private static int TypeHashCode { get; } = typeof(PropertyName).GetHashCode();

		public bool Equals(PropertyName other) => EqualsMarker(other);

		string IUrlParameter.GetString(IConnectionConfigurationValues settings)
		{
			if (!(settings is IConnectionSettingsValues oscSettings))
				throw new ArgumentNullException(nameof(settings),
					$"Can not resolve {nameof(PropertyName)} if no {nameof(IConnectionSettingsValues)} is provided");

			return oscSettings.Inferrer.PropertyName(this);
		}

		public static implicit operator PropertyName(string name) => name.IsNullOrEmpty() ? null : new PropertyName(name);

		public static implicit operator PropertyName(Expression expression) => expression == null ? null : new PropertyName(expression);

		public static implicit operator PropertyName(PropertyInfo property) => property == null ? null : new PropertyName(property);

		public override int GetHashCode()
		{
			unchecked
			{
				var result = TypeHashCode;
				result = (result * 397) ^ (_comparisonValue?.GetHashCode() ?? 0);
				result = (result * 397) ^ (_type?.GetHashCode() ?? 0);
				return result;
			}
		}

		public override bool Equals(object obj) =>
			obj is string s ? EqualsString(s) : obj is PropertyName r && EqualsMarker(r);

		private bool EqualsString(string other) => !other.IsNullOrEmpty() && other == Name;

		public bool EqualsMarker(PropertyName other) => _type != null
			? other != null && _type == other._type && _comparisonValue.Equals(other._comparisonValue)
			: other != null && _comparisonValue.Equals(other._comparisonValue);

		public static bool operator ==(PropertyName left, PropertyName right) => Equals(left, right);

		public static bool operator !=(PropertyName left, PropertyName right) => !Equals(left, right);
	}
}