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// (C) Copyright 2003-2023 by Autodesk, Inc.
//
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// object code form for any purpose and without fee is hereby granted,
// provided that the above copyright notice appears in all copies and
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// DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
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//

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;
using System.Threading;
using System.IO;
using System.Xml;

using Autodesk.Revit;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;

using TaskDialog = Autodesk.Revit.UI.TaskDialog;

namespace Revit.SDK.Samples.RayTraceBounce.CS
{
   /// <summary>
   /// A class inherits IExternalCommand interface.
   /// This class shows how to find intersection between ray and face and create  
   /// connecting lines by Revit API method FindReferencesByDirection.
   /// </summary>
   [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
   [Autodesk.Revit.Attributes.Regeneration(Autodesk.Revit.Attributes.RegenerationOption.Manual)]
   [Autodesk.Revit.Attributes.Journaling(Autodesk.Revit.Attributes.JournalingMode.NoCommandData)]
   public class Command : IExternalCommand
   {
      #region Class Memeber Variables
      /// <summary>
      /// revit application
      /// </summary>
      Autodesk.Revit.UI.UIApplication m_app;

      /// <summary>
      /// a 3D View
      /// </summary>
      Autodesk.Revit.DB.View3D m_view = null;
      #endregion

      #region Class Interface Implementation
      /// <summary>
      /// Implement this method as an external command for Revit.
      /// </summary>
      /// <param name="commandData">An object that is passed to the external application 
      /// which contains data related to the command, 
      /// such as the application object and active view.</param>
      /// <param name="message">A message that can be set by the external application 
      /// which will be displayed if a failure or cancellation is returned by 
      /// the external command.</param>
      /// <param name="elements">A set of elements to which the external application 
      /// can add elements that are to be highlighted in case of failure or cancellation.</param>
      /// <returns>Return the status of the external command. 
      /// A result of Succeeded means that the API external method functioned as expected. 
      /// Cancelled can be used to signify that the user cancelled the external operation 
      /// at some point. Failure should be returned if the application is unable to proceed with 
      /// the operation.</returns>
      public Autodesk.Revit.UI.Result Execute(ExternalCommandData commandData, ref string message, Autodesk.Revit.DB.ElementSet elements)
      {
         try
         {
            // should have a line style "bounce" created in the document before running this
            m_app = commandData.Application;
            Get3DView();
            if (m_view == null)
            {
               TaskDialog.Show("Revit", "A default 3D view (named {3D}) must exist before running this command");
               return Autodesk.Revit.UI.Result.Cancelled;
            }
            else
            {
               RayTraceBounceForm form = new RayTraceBounceForm(commandData, m_view);
               form.ShowDialog();
            }
            return Autodesk.Revit.UI.Result.Succeeded;
         }
         catch (Exception e)
         {
            message = e.ToString();
            return Autodesk.Revit.UI.Result.Failed;
         }
      }
      #endregion

      #region Class Implementation
      /// <summary>
      /// Get a 3D view from active document
      /// </summary>
      public void Get3DView()
      {
         List<Autodesk.Revit.DB.Element> list = new List<Autodesk.Revit.DB.Element>();
         FilteredElementCollector collector = new FilteredElementCollector(m_app.ActiveUIDocument.Document);
         list.AddRange(collector.OfClass(typeof(View3D)).ToElements());
         foreach (Autodesk.Revit.DB.View3D v in list)
         {
             // skip view template here because view templates are invisible in project browsers
             if (v != null && !v.IsTemplate && v.Name == "{3D}")
            {
               m_view = v as Autodesk.Revit.DB.View3D;
               break;
            }
         }
      }
      #endregion

   }
}