//******************************************************************************//
// PacketsParser.cs
// 12/4/2023
//
// RAYTHEON PROPRIETARY: THIS DOCUMENT CONTAINS DATA OR INFORMATION
// PROPRIETARY TO RAYTHEON COMPANY AND IS RESTRICTED TO USE ONLY BY PERSONS
// AUTHORIZED BY RAYTHEON COMPANY IN WRITING TO USE IT. DISCLOSURE TO
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// COMPANY.
//
// THIS PROPRIETARY NOTICE IS NOT APPLICABLE IF DELIVERED TO THE U.S. GOVERNMENT
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// UNPUBLISHED WORK - COPYRIGHT RAYTHEON COMPANY.
//
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// POC: Alex Kravchenko (1118268)
//******************************************************************************//
using NLog;
using Raytheon.LogDashboard.Model;
using System;
using System.Collections.Generic;
using System.Runtime.Serialization;
using System.Text;
using System.Threading;
using System.Xml;

namespace Raytheon.LogDashboard.Parsers
{
    [Serializable]
    [DataContract]
    public abstract class PacketsParser : IDisposable
    {
        protected static readonly Logger Logger = LogManager.GetCurrentClassLogger();

        protected readonly XmlParserContext XmlContext;
        protected readonly Encoding Encoding = Encoding.ASCII;

        public string Address { get; protected set; }

        public bool IsInitialized { get; protected set; }
        public List<IgnoredIPAddr> IgnoredIPs { get; set; }

        public string Name { get; set; }

        public CancellationTokenSource CancellationToken { get; set; }

        public bool IsAutoSave { get; set; }

        public PacketsParser(string name, bool isAutoSave)
        {
            Name = name;

            XmlContext = CreateContext();
            IgnoredIPs = Settings.Instance.IgnoredIPs;
            IsAutoSave = isAutoSave;
        }

        public virtual bool Init()
        {
            CancellationToken = new CancellationTokenSource();
            return true;
        }

        public abstract LogMessage GetLog();

        protected XmlParserContext CreateContext()
        {
            NameTable nt = new NameTable();
            XmlNamespaceManager nsmanager = new XmlNamespaceManager(nt);
            nsmanager.AddNamespace("log4j", "http://jakarta.apache.org/log4j/");
            nsmanager.AddNamespace("nlog", "http://nlog-project.org");
            return new XmlParserContext(nt, nsmanager, "elem", XmlSpace.None, Encoding.UTF8);
        }

        protected DateTime UnixTimeStampToDateTime(long unixTimeStamp)
        {
            return new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc).AddMilliseconds(unixTimeStamp);
        }

        public virtual void Dispose()
        {
            CancellationToken?.Cancel();
            IsInitialized = false;
        }
    }
}
