using System;

 using System.Collections.Generic;

 using System.Diagnostics;

 using System.IO;

 using System.Linq;

 using System.Runtime.Serialization;

 using System.Text;

 using System.Threading.Tasks;

 namespace SharpLib.Ear

 {

     [DataContract]

     [AttributeObject(Id = "Action.Launch.App", Name = "Launch application", Description = "Launch an application.")]

     public class ActionLaunchApp : Action

     {

         [DataMember]

         [AttributeObjectProperty

             (

             Id = "Action.Launch.App.File",

             Name = "File to launch",

             Description = "Specifies the application file to launch.",

             Filter = "EXE files (*.exe)|*.exe"

             )

         ]

         public PropertyFile File { get; set; } = new PropertyFile();

         [DataMember]

         [AttributeObjectProperty

             (

             Id = "Action.Launch.App.SwitchTo",

             Name = "Switch to",

             Description = "Specifies if we should switch the application if it's already launched."

             )

         ]

         public bool SwitchTo { get; set; } = true;

         [DataMember]

         [AttributeObjectProperty

             (

             Id = "Action.Launch.App.MultipleInstance",

             Name = "Multiple Instance",

             Description = "Specifies if We should launch multiple instance."

             )

         ]

         public bool MultipleInstance { get; set; } = false;

         public override string BriefBase()

         {

             return AttributeName + ": " + Path.GetFileName(File.FullPath);

         }

         public override bool IsValid()

         {

             // This is a valid configuration only if our file exists

             return System.IO.File.Exists(File.FullPath);

         }

         [System.Runtime.InteropServices.DllImportAttribute("user32.dll", EntryPoint = "SwitchToThisWindow")]

         public static extern void SwitchToThisWindow([System.Runtime.InteropServices.InAttribute()] System.IntPtr hwnd, [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.Bool)] bool fUnknown);

         protected override async Task DoExecute()

         {

             //First check if the process we want to launch already exists

             string procName = Path.GetFileNameWithoutExtension(File.FullPath);

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

             if (existingProcesses == null || existingProcesses.Length == 0 || MultipleInstance)

             {

                 // Process do not exists just try to launch it

                 ProcessStartInfo start = new ProcessStartInfo();

                 // Enter in the command line arguments, everything you would enter after the executable name itself

                 //start.Arguments = arguments; 

                 // Enter the executable to run, including the complete path

                 start.FileName = File.FullPath;

                 start.WindowStyle = ProcessWindowStyle.Normal;

                 start.CreateNoWindow = true;

                 start.UseShellExecute = true;

                 // Run the external process & wait for it to finish

                 Process proc = Process.Start(start);

                 //SL: We could have used that too

                 //Shell32.Shell shell = new Shell32.Shell();

                 //shell.ShellExecute(Properties.Settings.Default.StartFileName);

             }

             else if (SwitchTo)

             {

                 //This won't work properly until we have a manifest that enables uiAccess.

                 //However uiAccess just won't work with ClickOnce so we will have to use a different deployment system.

                 SwitchToThisWindow(existingProcesses[0].MainWindowHandle, true);

             }

         }

     }

 }