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// (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
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namespace Revit.SDK.Samples.CreateBeamSystem.CS
{
    using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Windows.Forms;
    using System.Diagnostics;

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

    /// <summary>
    /// external applications' only entry point class that supports the IExternalCommand interface
    /// </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>
        /// 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)
        {

            Transaction tran = new Transaction(commandData.Application.ActiveUIDocument.Document, "CreateBeamSystem");
            tran.Start();

            try
            {
                GeometryUtil.CreApp = commandData.Application.Application.Create;

                // initialize precondition data of the program
                BeamSystemData data = new BeamSystemData(commandData);
                // display form to collect user's setting for beam system
                using (BeamSystemForm form = new BeamSystemForm(data))
                {
                    if (form.ShowDialog() != DialogResult.OK)
                    {
                        tran.RollBack();
                        return Autodesk.Revit.UI.Result.Cancelled;
                    }
                }

                // create beam system using the parameters saved in BeamSystemData
                BeamSystemBuilder builder = new BeamSystemBuilder(data);
                builder.CreateBeamSystem();
            }
            catch (ErrorMessageException errorEx)
            {
                // checked exception need to show in error messagebox
                message = errorEx.Message;
                tran.RollBack();
                return Autodesk.Revit.UI.Result.Failed;
            }
            catch(Exception ex)
            {
                // unchecked exception cause command failed
                message = "Command is failed for unexpected reason.";
                Trace.WriteLine(ex.ToString());
                tran.RollBack();
                return Autodesk.Revit.UI.Result.Failed;
            }

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