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using System;
using System.Windows.Forms;
using System.Collections;
using System.Collections.Generic;

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

namespace Revit.SDK.Samples.CreateTrianglesTopography.CS
{
    /// <summary>
    /// Implements the Revit add-in interface IExternalCommand
    /// </summary>
    [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
    [Autodesk.Revit.Attributes.Regeneration(Autodesk.Revit.Attributes.RegenerationOption.Manual)]
    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 canceled the external operation 
        /// at some point. Failure should be returned if the application is unable to proceed with 
        /// the operation.</returns>
        public virtual Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
        {
            try
            {
                Document document = commandData.Application.ActiveUIDocument.Document;

                TrianglesData trianglesData = TrianglesData.Load();

                using (Transaction tran = new Transaction(document, "CreateTrianglesTopography"))
                {

                    tran.Start();
                    // Creates a new topography surface element from facets and adds it to the document.
                    IList<PolymeshFacet> triangleFacets = new List<PolymeshFacet>();
                    foreach (List<int> facet in trianglesData.Facets)
                    {
                       triangleFacets.Add(new PolymeshFacet(facet[0], facet[1], facet[2]));
                    }
                    TopographySurface topoSurface = TopographySurface.Create(document, trianglesData.Points, triangleFacets);
                    Parameter name = topoSurface.get_Parameter(Autodesk.Revit.DB.BuiltInParameter.ROOM_NAME);
                    if (name != null)
                        name.Set("CreateTrianglesTopography");
                    tran.Commit();
                }

                return Result.Succeeded;
            }
            catch (Exception ex)
            {
                message = ex.Message;
                return Result.Failed;
            }
        }
    }
}