//
// (C) Copyright 2003-2019 by Autodesk, Inc.
//
// Permission to use, copy, modify, and distribute this software in
// 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
// restricted rights notice below appear in all supporting
// documentation.
//
// AUTODESK PROVIDES THIS PROGRAM "AS IS" AND WITH ALL FAULTS.
// AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF
// MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. AUTODESK, INC.
// DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
// UNINTERRUPTED OR ERROR FREE.
//
// Use, duplication, or disclosure by the U.S. Government is subject to
// restrictions set forth in FAR 52.227-19 (Commercial Computer
// Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
// (Rights in Technical Data and Computer Software), as applicable.
//
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;

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

using Element = Autodesk.Revit.DB.Element;
using GeometryElement = Autodesk.Revit.DB.GeometryElement;

namespace Revit.SDK.Samples.ObjectViewer.CS
{
    /// <summary>
    /// Implements the Revit add-in interface IExternalCommand
    /// </summary>
    [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.ReadOnly)]
    [Autodesk.Revit.Attributes.Regeneration(Autodesk.Revit.Attributes.RegenerationOption.Manual)]
    [Autodesk.Revit.Attributes.Journaling(Autodesk.Revit.Attributes.JournalingMode.NoCommandData)]
    public class Command : IExternalCommand
    {
        // internal buffer
        private static ExternalCommandData m_commandData;

        /// <summary>
        /// singleton in the external application
        /// </summary>
        public static ExternalCommandData CommandData
        {
            get
            {
                return m_commandData;
            }
        }

        /// <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
            {
                // initialize member
                m_commandData = commandData;
                // process data from Revit and show dialog
                ObjectViewer viewer = new ObjectViewer();
                using (ObjectViewerForm viewerFrm = new ObjectViewerForm(viewer))
                {
                    if (viewerFrm.ShowDialog() == DialogResult.OK)
                    {
                        return Autodesk.Revit.UI.Result.Succeeded;
                    }
                }
            }
            catch (ErrorMessageException msgEx)
            {
                // deal with checked exception
                message = msgEx.Message;
                return Autodesk.Revit.UI.Result.Failed;
            }
            catch
            {
                message = "External Application is aborted for unknown reason.";
                return Autodesk.Revit.UI.Result.Failed;
            }
            return Autodesk.Revit.UI.Result.Cancelled;
        }
    }
}