//
// (C) Copyright 2003-2019 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
// that both that copyright notice and the limited warranty and
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// documentation.
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// DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
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// restrictions set forth in FAR 52.227-19 (Commercial Computer
// Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
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//

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

using Autodesk.Revit;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.DB.Fabrication;
using System.Windows.Forms;
using Autodesk.Revit.UI.Selection;

namespace Revit.SDK.Samples.FabricationPartLayout.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 SplitStraight : 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
         {
            // check user selection
            var uiDoc = commandData.Application.ActiveUIDocument;
            var doc = uiDoc.Document;

            Reference refObj = uiDoc.Selection.PickObject(ObjectType.Element, "Pick a fabrication part straight to start.");
            var part = doc.GetElement(refObj) as FabricationPart;

            if (part == null || part.IsAStraight() == false)
            {
               message = "The selected element is not a fabrication part straight.";
               return Result.Failed;
            }

            // get the 2 end connectors
            var connectors = new List<Connector>();
            foreach (Connector c in part.ConnectorManager.Connectors)
            {
               if (c.ConnectorType == ConnectorType.End)
                  connectors.Add(c);
            }

            if (connectors.Count != 2)
            {
               message = "There are not 2 end connectors on this straight.";
               return Result.Failed;
            }

            var conn1 = connectors[0];
            var conn2 = connectors[1];

            var x = (conn1.Origin.X + conn2.Origin.X) / 2.0;
            var y = (conn1.Origin.Y + conn2.Origin.Y) / 2.0;
            var z = (conn1.Origin.Z + conn2.Origin.Z) / 2.0;

            var midpoint = new XYZ(x, y, z);

            if (part.CanSplitStraight(midpoint) == false)
            {
               message = "straight cannot be split at its mid-point";
               return Result.Failed;
            }

            using (var trans = new Transaction(doc, "split straight"))
            {
               trans.Start();

               part.SplitStraight(midpoint);

               trans.Commit();
            }

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