//
// (C) Copyright 2003-2019 by Autodesk, Inc. All rights reserved.
//
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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
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// restricted rights notice below appear in all supporting
// documentation.

//
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// DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Autodesk.Revit.UI;
using Autodesk.Revit.DB;
using Autodesk.Revit.DB.Architecture;

namespace Revit.SDK.Samples.Site.CS
{
    /// <summary>
    /// A command that deletes a subregion and all topography surface points it contains.
    /// </summary>
    [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
    class SiteDeleteRegionAndPointsCommand: IExternalCommand
    {
        #region IExternalCommand Members
        /// <summary>
        /// Implementation of the command.
        /// </summary>
        /// <param name="commandData"></param>
        /// <param name="message"></param>
        /// <param name="elements"></param>
        /// <returns></returns>
        public Result Execute(ExternalCommandData commandData, ref string message, Autodesk.Revit.DB.ElementSet elements)
        {
            DeleteSubregionAndPoints(commandData.Application.ActiveUIDocument);

            return Result.Succeeded;
        }

        /// <summary>
        /// Deletes a subregion and all topography surface points it contains.
        /// </summary>
        /// <param name="uiDoc">The document.</param>
        public void DeleteSubregionAndPoints(UIDocument uiDoc)
        {
            Document doc = uiDoc.Document;

            // Select subregion
            TopographySurface subregion = SiteUIUtils.PickSubregion(uiDoc);
            TopographySurface toposurface = SiteEditingUtils.GetTopographySurfaceHost(subregion);
            IList<XYZ> points = SiteEditingUtils.GetNonBoundaryPoints(subregion);

            // All changes are added to one transaction group - will create one undo item
            using (TransactionGroup deleteGroup = new TransactionGroup(doc, "Delete region"))
            {
                deleteGroup.Start();

                // Edit scope to delete points- if there are points in the region
                if (points.Count > 0)
                {
                    using (TopographyEditScope editScope = new TopographyEditScope(doc, "Edit TS"))
                    {
                        editScope.Start(toposurface.Id);

                        // Transaction for point deletion
                        using (Transaction t = new Transaction(doc, "Delete points"))
                        {
                            t.Start();
                            toposurface.DeletePoints(points);
                            t.Commit();
                        }


                        editScope.Commit(new TopographyEditFailuresPreprocessor());
                    }
                }

                // Transaction to delete subregion
                using (Transaction t2 = new Transaction(doc, "Delete subregion"))
                {
                    t2.Start();
                    doc.Delete(subregion.Id);
                    t2.Commit();
                }
                deleteGroup.Assimilate();
            }

        }

        #endregion
    }
}