using System.Diagnostics;
using System.IO.Pipes;
using System.Linq;
using System.Threading;

namespace Barotrauma.Networking
{
    static partial class ChildServerRelay
    {
        public static Process Process;
        public static bool IsProcessAlive => Process is { HasExited: false };

        private static bool localHandlesDisposed;
        private static AnonymousPipeServerStream writePipe;
        private static AnonymousPipeServerStream readPipe;

        public static void Start(ProcessStartInfo processInfo)
        {
            CrashString = null;
            CrashReportFilePath = null;
            
            writePipe = new AnonymousPipeServerStream(PipeDirection.Out, System.IO.HandleInheritability.Inheritable);
            readPipe = new AnonymousPipeServerStream(PipeDirection.In, System.IO.HandleInheritability.Inheritable);

            writeStream = writePipe; readStream = readPipe;

            PrivateStart();

            processInfo.ArgumentList.Add("-pipes");
            processInfo.ArgumentList.Add(writePipe.GetClientHandleAsString());
            processInfo.ArgumentList.Add(readPipe.GetClientHandleAsString());
            try
            {
                Process = Process.Start(processInfo);
            }
            catch
            {
                DebugConsole.ThrowError($"Failed to start ChildServerRelay Process. File: {processInfo.FileName}, arguments: {processInfo.Arguments}");
                ForceShutDown();
                throw;
            }

            localHandlesDisposed = false;
        }

        public static void DisposeLocalHandles()
        {
            if (localHandlesDisposed) { return; }
            writePipe.DisposeLocalCopyOfClientHandle(); readPipe.DisposeLocalCopyOfClientHandle();
            localHandlesDisposed = true;
        }

        public static void AttemptGracefulShutDown(int maxAttempts = 20)
        {
            status = StatusEnum.RequestedShutDown;
            writeManualResetEvent?.Set();
            int checks = 0;
            while (Process is { HasExited: false })
            {
                if (checks >= maxAttempts)
                {
                    DebugConsole.AddWarning("Server could not be shut down gracefully");
                    break;
                }
                Thread.Sleep(100);
                checks++;
            }
            ForceShutDown();
        }
        
        public static void ForceShutDown()
        {
            Process?.Kill(); Process = null;
            PrivateShutDown();
        }

        public static string CrashString { get; private set; }
        public static string CrashReportFilePath { get; private set; }

        public static LocalizedString CrashMessage
            => string.IsNullOrEmpty(CrashReportFilePath)
                ? TextManager.Get("ServerProcessClosed")
                : TextManager.GetWithVariable("ServerProcessCrashed", "[reportfilepath]", CrashReportFilePath);
        
        static partial void HandleCrashString(string str)
        {
            DebugConsole.ThrowError($"The server has crashed: {str}");
            CrashReportFilePath = str.Split("||").FirstOrDefault() ?? "servercrashreport.log";
            CrashString = str;
        }
    }
}