// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Resources;
using System.Runtime.Serialization;

namespace System.Xml.XPath
{
    // Represents the exception that is thrown when there is error processing an
    // XPath expression.
    [Serializable]
    [System.Runtime.CompilerServices.TypeForwardedFrom("System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089")]
    public class XPathException : SystemException
    {
        // we need to keep this members for V1 serialization compatibility
        private readonly string _res;
        private readonly string?[]? _args;

        // message != null for V1 & V2 exceptions deserialized in Whidbey
        // message == null for created V2 exceptions; the exception message is stored in Exception._message
        private readonly string? _message;

        [Obsolete(Obsoletions.LegacyFormatterImplMessage, DiagnosticId = Obsoletions.LegacyFormatterImplDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
        [EditorBrowsable(EditorBrowsableState.Never)]
        protected XPathException(SerializationInfo info, StreamingContext context) : base(info, context)
        {
            _res = (string)info.GetValue("res", typeof(string))!;
            _args = (string[]?)info.GetValue("args", typeof(string[]));

            // deserialize optional members
            string? version = null;
            foreach (SerializationEntry e in info)
            {
                if (e.Name == "version")
                {
                    version = (string?)e.Value;
                }
            }

            if (version == null)
            {
                // deserializing V1 exception
                _message = CreateMessage(_res, _args);
            }
            else
            {
                // deserializing V2 or higher exception -> exception message is serialized by the base class (Exception._message)
                _message = null;
            }
        }

        [Obsolete(Obsoletions.LegacyFormatterImplMessage, DiagnosticId = Obsoletions.LegacyFormatterImplDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
        [EditorBrowsable(EditorBrowsableState.Never)]
        public override void GetObjectData(SerializationInfo info, StreamingContext context)
        {
            base.GetObjectData(info, context);
            info.AddValue("res", _res);
            info.AddValue("args", _args);
            info.AddValue("version", "2.0");
        }

        public XPathException() : this(string.Empty, (Exception?)null) { }

        public XPathException(string? message) : this(message, (Exception?)null) { }

        public XPathException(string? message, Exception? innerException) :
            this(SR.Xml_UserException, new string?[] { message }, innerException)
        {
        }

        internal static XPathException Create(string res)
        {
            return new XPathException(res, (string[]?)null);
        }

        internal static XPathException Create(string res, string arg)
        {
            return new XPathException(res, new string[] { arg });
        }

        internal static XPathException Create(string res, string arg, string arg2)
        {
            return new XPathException(res, new string[] { arg, arg2 });
        }

        internal static XPathException Create(string res, string arg, Exception innerException)
        {
            return new XPathException(res, new string[] { arg }, innerException);
        }

        private XPathException(string res, string[]? args) :
            this(res, args, null)
        {
        }

        private XPathException(string res, string?[]? args, Exception? inner) :
            base(CreateMessage(res, args), inner)
        {
            HResult = HResults.XmlXPath;
            _res = res;
            _args = args;
        }

        private static string CreateMessage(string res, string?[]? args)
        {
            try
            {
                string message = args == null ? res : string.Format(res, args);
                if (message != null)
                {
                    return message;
                }
            }
            catch (MissingManifestResourceException) { }

            return $"UNKNOWN({res})";
        }

        public override string Message
        {
            get
            {
                return _message ?? base.Message;
            }
        }
    }
}