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using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;

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

namespace Revit.SDK.Samples.DeleteDimensions.CS
{
   /// <summary>
   ///Add a command that given a selection deletes all the unpinned dimensions 
   /// that are found in that selection.
   /// </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
   {
      /// <summary>
      /// Overload this method to implement the external command within 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)
      {
         ElementSet selections = new ElementSet();
         foreach (ElementId elementId in commandData.Application.ActiveUIDocument.Selection.GetElementIds())
         {
            selections.Insert(commandData.Application.ActiveUIDocument.Document.GetElement(elementId));
         }
         ElementSet dimsToDelete = new Autodesk.Revit.DB.ElementSet();

         //warning if nothing selected
         if (0 == selections.Size)
         {
            message = "Please select dimensions";
            return Autodesk.Revit.UI.Result.Failed;
         }

         //find all unpinned dimensions in the current selection 
         foreach (Element e in selections)
         {
            Dimension dimesionTemp = e as Dimension;
            if (null != dimesionTemp && !dimesionTemp.Pinned)
            {
               dimsToDelete.Insert(dimesionTemp);
            }
         }

         //warning if could not find any unpinned dimension
         if (0 == dimsToDelete.Size)
         {
            message = "There are no unpinned dimensions currently selected";
            return Autodesk.Revit.UI.Result.Failed;
         }

         Transaction transaction = new Transaction(commandData.Application.ActiveUIDocument.Document, "External Tool");

         transaction.Start();
         //delete all the unpinned dimensions
         foreach (Element e in dimsToDelete)
         {
             commandData.Application.ActiveUIDocument.Document.Delete(e.Id);
         }

         transaction.Commit();
         return Autodesk.Revit.UI.Result.Succeeded;
      }
   }
}