using BeWoLauncher.Utils;
using BS.SharedLauncher.Information;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.IO.Pipes;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Threading;

namespace BeWoLauncher.Logic
{
    public static class ProcessController
    {
        private static Process PlanerProcess { get; set; }

        public static Application Current => Application.Current;
        public static LauncherApp CurrentLauncher => Current as LauncherApp;

        private static bool PlanerRunning
        {
            get
            {
                if (PlanerProcess is null)
                    return false;
                PlanerProcess.Refresh();
                return !PlanerProcess.HasExited;
            }
        }

        internal static void CheckForOtherInstance()
        {
            string procName = Process.GetCurrentProcess().ProcessName;

            Process[] processes = Process.GetProcessesByName(procName);

            if (processes.Length > 1)
            {
                MessageBox.Show("BeWo Prozess läuft bereits");
                StartLauncherShutdown();
            }
        }



        internal static void StartLauncherShutdown()
        {
            Current.Shutdown();
        }

        internal static void StartPlanerProcess()
        {
            // based on https://docs.microsoft.com/en-us/dotnet/standard/io/how-to-use-anonymous-pipes-for-local-interprocess-communication?redirectedfrom=MSDN
            PlanerProcess = new Process();

            PlanerProcess.StartInfo.FileName = BeWoPaths.GetPlanerExePath();
            PlanerProcess.EnableRaisingEvents = true;
            PlanerProcess.Exited += PlanerProcess_Exit;

            using (AnonymousPipeServerStream pipeServer = new AnonymousPipeServerStream(PipeDirection.Out, HandleInheritability.Inheritable))
            {
                PlanerProcess.StartInfo.Arguments = pipeServer.GetClientHandleAsString();
                PlanerProcess.StartInfo.UseShellExecute = false;
                PlanerProcess.Start();

                pipeServer.DisposeLocalCopyOfClientHandle();

                try
                {
                    using (StreamWriter sw = new StreamWriter(pipeServer))
                    {
                        sw.AutoFlush = true;

                        sw.WriteLine("C-137");
                        pipeServer.WaitForPipeDrain();

                        sw.WriteLine(ConnectionInformation.Connection.ToString());
                        pipeServer.WaitForPipeDrain();
                    }
                }
                catch (IOException ex)
                {

                }
            }

            ViewController.Window.Hide();
        }
        internal static void KillPlanerProcess()
        {
            foreach (var process in Process.GetProcesses())
            {
                if (process.ProcessName.Contains("BeWoPlaner"))
                {
                    process.Kill();
                }
            }
        }
        
        internal static void PlanerProcess_Exit(object sender, EventArgs e)
        {
            // ExitCode Übersicht:
            // 100 - Nutzer hat Logout in Core gedrückt
            // 0 - Nutzer hat Fenster geschlossen
            // 1 - Proess über TaskManager gekillt

            if (PlanerProcess.ExitCode == 100)
            {
                CurrentLauncher.Dispatcher.BeginInvoke(DispatcherPriority.Normal, (Action)delegate {
                    ViewController.Window.ShowLoginPage();
                    ViewController.Window.Show();
                });
                return;
            }

            CurrentLauncher.Dispatcher.BeginInvoke(DispatcherPriority.Normal, (Action)StartLauncherShutdown);
        }
    }
}