using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading;

using System.Diagnostics;

using System.IO;

using System.Runtime.InteropServices;



namespace NougakudoLauncher

{

    class Startup

    {

        Process rubyProcess;



        StreamWriter rubyWriter;

        StreamReader rubyReader;



        FileSystemWatcher signalWatcher;







        public bool Run(string ruby, string args, string environment)

        {

            ProcessStartInfo procInfo = new ProcessStartInfo(ruby);

            procInfo.Arguments = args;



            // BUNDLE_GEMFILE environment parameter

            if (environment != "")

            {

                var bundle = environment.Split('=');

                procInfo.EnvironmentVariables[bundle[0]] = bundle[1];

            }



            procInfo.UseShellExecute = false;

            procInfo.RedirectStandardOutput = true;



            procInfo.RedirectStandardInput = true;



            rubyProcess = new Process();

            rubyProcess.StartInfo = procInfo;



            rubyProcess.OutputDataReceived += new DataReceivedEventHandler(rubyProcess_OutputDataReceived);

            SetSignalWatcher();

            Console.WriteLine("Startup:Ruby Start");

            rubyProcess.Start();

            rubyProcess.BeginOutputReadLine();

            //rubyReader = rubyProcess.StandardOutput;

            Logging.Write("Startup:Nougakudo ruby process({1}) start by PID={0}.", new object[] { GetProcessId(), rubyProcess.Id }, Logging.LogType.INFO);

            //rubyWriter = rubyProcess.StandardInput;



            Console.WriteLine("Ruby process wait");



            rubyProcess.WaitForExit();



            int exitCode = rubyProcess.ExitCode;    // Add ErrorCode



            Console.WriteLine("Ruby process exit");

            rubyProcess.Close();



            if (exitCode == 0)      // Add ruby start error.

                return true;        // Normal end

            else

                return false;       // Error

        }



        string GetProcessId()

        {

            return Process.GetCurrentProcess().Id.ToString();

        }



        void SetSignalWatcher()

        {

            signalWatcher = new System.IO.FileSystemWatcher(".", GetProcessId() + ".*");

            signalWatcher.Created += new System.IO.FileSystemEventHandler(signalWatcher_Created);

            signalWatcher.EnableRaisingEvents = true;

            Logging.Write("Startup:Start to observe a terminate request.", Logging.LogType.INFO);



        }



        void signalWatcher_Created(object sender, System.IO.FileSystemEventArgs e)

        {

            Logging.Write("Startup:Received a terminate request.", Logging.LogType.INFO);

            while (true)

            {

                try

                {

                    if (File.Exists(e.FullPath))

                        File.Delete(e.Name);

                    break;

                }

                catch (Exception ex)

                {

                    Logging.Write("Startup:terminate file delete error:" + ex.Message, Logging.LogType.WARNING);

                }

                Thread.Sleep(500);

            }

            SendTerminate();

        }



        void rubyProcess_OutputDataReceived(object sender, DataReceivedEventArgs outLine)

        {

            Logging.Write("OutputDataRec:" + outLine.Data, Logging.LogType.INFO);

            //Console.WriteLine("Redirect: {0}", outLine.Data);

        }



        //public void Read_StandardIO()

        //{

        //    var sr = (TextReader)rubyReader;

        //    if (rubyReader.EndOfStream)

        //    {

        //        Console.WriteLine("No Stream");

        //    }

        //    else

        //    {

        //        var d = sr.ReadToEnd();

        //        Console.WriteLine("hhhh:{0}", d);

        //    }

        //}





        public void SendTerminate()

        {

            Logging.Write("Startup:Generate a terminate request.", Logging.LogType.INFO);

            var ret = GenerateConsoleCtrlEvent(ConsoleCtrlEvent.CTRL_C, 0);

            if (ret)

                Console.WriteLine("GenerateConsoleCtrlEvent true");

            else

                Console.WriteLine(Marshal.GetLastWin32Error().ToString());



        }







        

        [DllImport("kernel32.dll", SetLastError=true)]

        static extern bool GenerateConsoleCtrlEvent(ConsoleCtrlEvent sigevent, int dwProcessGroupId); 

        public enum ConsoleCtrlEvent 

        { 

            CTRL_C = 0, 

            CTRL_BREAK = 1, 

            CTRL_CLOSE = 2, 

            CTRL_LOGOFF = 5, 

            CTRL_SHUTDOWN = 6 

        }



    }

}