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// (C) Copyright 2003-2020 by Autodesk, Inc.
//
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// object code form for any purpose and without fee is hereby granted,
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using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.UI.Selection;
using System;


namespace Revit.SDK.Samples.InCanvasControlAPI.CS
{
   /// <summary>
   /// Implements the Revit add-in interface IExternalCommand
   /// </summary>
   [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
   [Autodesk.Revit.Attributes.Regeneration(Autodesk.Revit.Attributes.RegenerationOption.Manual)]
   public class Command : IExternalCommand
   {
      /// <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 virtual Result Execute(ExternalCommandData commandData
         , ref string message, ElementSet elements)
      {
         try
         {
            Document document = commandData.Application.ActiveUIDocument.Document;
            Selection choices = commandData.Application.ActiveUIDocument.Selection;
            IssueMarkerTracking tracking = IssueMarkerTrackingManager.GetInstance().GetTracking(document);

            // Pick one object from Revit.
            Reference hasPickOne = choices.PickObject(ObjectType.Element, "Select an element to create a control on.");

            if (hasPickOne != null && tracking.GetMarkerByElementId(hasPickOne.ElementId) == null)
            {
               IssueMarker marker = IssueMarker.Create(document, hasPickOne.ElementId);

               // Register the marker in tracking.
               tracking.SubscribeMarker(marker);
            }

            return Result.Succeeded;
         }
         catch (Exception ex)
         {
            message = ex.Message;
            return Result.Failed;
         }
      }
   }

}