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using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
using System.Drawing;
using Autodesk.Revit;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.DB.Structure;

namespace Revit.SDK.Samples.NewPathReinforcement.CS
{
    /// <summary>
    /// The entrance of this example, implement the Execute method of IExternalCommand
    /// </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 IExternalCommand Members 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
         {
            Wall wall = null;
            Floor floor = null;

            ElementSet elems = new ElementSet();
            foreach (ElementId elementId in commandData.Application.ActiveUIDocument.Selection.GetElementIds())
            {
               elems.Insert(commandData.Application.ActiveUIDocument.Document.GetElement(elementId));
            }
            #region selection handle -- select one Slab (or Structure Wall)
            //if user had some wrong selection, give user an Error message
            string errorMessage =
                "Please select one Slab (or Structure Wall) to create PathReinforcement.";
            if (1 != elems.Size)
            {
               message = errorMessage;
               return Autodesk.Revit.UI.Result.Cancelled;
            }

            Autodesk.Revit.DB.Element selectElem = null;
            IEnumerator iter = elems.GetEnumerator();
            iter.Reset();
            if (iter.MoveNext())
            {
               selectElem = (Autodesk.Revit.DB.Element)iter.Current;
            }

            if (selectElem is Wall)
            {
               wall = selectElem as Wall;
            }
            else if (selectElem is Floor)
            {
               floor = selectElem as Floor;
            }
            else
            {
               message = errorMessage;
               return Autodesk.Revit.UI.Result.Cancelled;
            }
            #endregion
            try
            {
               if (null != wall)
               {
                  ProfileWall profileWall = new ProfileWall(wall, commandData);
                  NewPathReinforcementForm newPathReinforcementForm =
                      new NewPathReinforcementForm(profileWall);
                  newPathReinforcementForm.ShowDialog();
               }
               else if (null != floor)
               {
                  ProfileFloor profileFloor = new ProfileFloor(floor, commandData);
                  NewPathReinforcementForm newPathReinforcementForm =
                      new NewPathReinforcementForm(profileFloor);
                  newPathReinforcementForm.ShowDialog();
               }
            }
            catch (Exception ex)
            {
               message = ex.Message;
               return Autodesk.Revit.UI.Result.Cancelled;
            }

            return Autodesk.Revit.UI.Result.Succeeded;
         }
         catch (Exception e)
         {
            message = e.Message;
            return Autodesk.Revit.UI.Result.Failed;
         }
      }
      #endregion
   }
}