using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Uni_Trend.MSO7000X.Common.Helper
{
    public  static class DesignTimeHelper
    {
        private static Boolean? _isAssemblyVisualStudio;
        private static Boolean? _isLicenseDesignTime;
        private static Boolean? _isProcessDevEnv;
        private static Boolean? _mIsDesignerHosted;

        /// <summary>
        ///   Property <see cref="Form.DesignMode"/> does not correctly report if a nested <see cref="UserControl"/>
        ///   is in design mode.  InDesignMode is a corrected that property which .
        ///   (see https://connect.microsoft.com/VisualStudio/feedback/details/553305
        ///   and https://stackoverflow.com/a/2693338/238419 )
        /// </summary>
        public static Boolean InDesignMode(this Control userControl, String source = null)
          => IsLicenseDesignTime
             || IsProcessDevEnv
             || IsExecutingAssemblyVisualStudio
             || IsDesignerHosted(userControl);

        private static Boolean IsExecutingAssemblyVisualStudio
          => _isAssemblyVisualStudio
             ?? (_isAssemblyVisualStudio = Assembly
               .GetExecutingAssembly()
               .Location.Contains(value: "VisualStudio"))
             .Value;

        private static Boolean IsLicenseDesignTime
          => _isLicenseDesignTime
             ?? (_isLicenseDesignTime = LicenseManager.UsageMode == LicenseUsageMode.Designtime)
             .Value;

        private static Boolean IsDesignerHosted(
          Control control)
        {
            if (_mIsDesignerHosted.HasValue)
                return _mIsDesignerHosted.Value;

            while (control != null)
            {
                if (control.Site?.DesignMode == true)
                {
                    _mIsDesignerHosted = true;
                    return true;
                }

                control = control.Parent;
            }

            _mIsDesignerHosted = false;
            return false;
        }

        private static Boolean IsProcessDevEnv
          => _isProcessDevEnv
             ?? (_isProcessDevEnv = Process.GetCurrentProcess()
                                      .ProcessName == "devenv")
             .Value;
    }
}