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using System;
using System.Collections.Generic;

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

using AppCreation = Autodesk.Revit.Creation.Application;

namespace Revit.SDK.Samples.AutoJoin.CS
{
    /// <summary>
    /// This sample demonstrates how to automatically join geometry 
    /// between multiple generic forms for use in family modeling and massing. 
    /// </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
    {
        
        public static AppCreation s_appCreation;

        /// <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 Autodesk.Revit.UI.Result Execute(ExternalCommandData commandData
            , ref string message, Autodesk.Revit.DB.ElementSet elements)
        {
            Transaction trans = new Transaction(commandData.Application.ActiveUIDocument.Document, "Revit.SDK.Samples.AutoJoin");
            trans.Start();
            if (null == s_appCreation)
            {
                // share for class Intersection.
                s_appCreation = commandData.Application.Application.Create;                
            }
            
            UIDocument doc = commandData.Application.ActiveUIDocument;
            CombinableElementArray solids
                = new CombinableElementArray();

            ElementSet es = new ElementSet();
            foreach (ElementId elemId in es)
            {
               es.Insert(doc.Document.GetElement(elemId));
            }
            if (0 < es.Size)
            {
                foreach (Autodesk.Revit.DB.ElementId elementId in doc.Selection.GetElementIds())
                {
                   Autodesk.Revit.DB.Element element = doc.Document.GetElement(elementId);
                    System.Diagnostics.Trace.WriteLine(element.GetType().ToString());

                    GenericForm gf = element as GenericForm;
                    if (null != gf && !gf.IsSolid)
                        continue;

                    CombinableElement ce = element as CombinableElement;
                    if (null != ce)
                        solids.Append(ce);
                }

                if (solids.Size < 2)
                {
                    message = "At least 2 combinable elements should be selected.";
                    trans.RollBack();
                    return Autodesk.Revit.UI.Result.Failed;
                }

                doc.Document.CombineElements(solids);

                //The selected generic forms are joined, whether or not they overlap.
                trans.Commit();
                return Autodesk.Revit.UI.Result.Succeeded;                
            }

            AutoJoin autojoin = new AutoJoin();
            autojoin.Join(doc.Document);
            //All overlapping generic forms are joined.
            trans.Commit();
            return Autodesk.Revit.UI.Result.Succeeded;
        }
    }    
}