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namespace Revit.SDK.Samples.CreateSimpleAreaRein.CS
{
    using System.Collections.Generic;
    using System.Linq;

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

    using Element = Autodesk.Revit.DB.Element;


    /// <summary>
    /// provide utility method to get geometry data for 
    /// creating AreaReinforcement on wall or floor
    /// </summary>
    class GeomHelper
    {
        private Document m_currentDoc;    //active document

        /// <summary>
        /// constructor, initialize m_currentDoc
        /// </summary>
        public GeomHelper()
        {
            m_currentDoc = Command.CommandData.Application.ActiveUIDocument.Document;
        }

      /// <summary>
      /// get necessary data when create AreaReinforcement on a straight wall
      /// </summary>
      /// <param name="wall">wall on which to create AreaReinforcemen</param>
      /// <param name="refer">reference of the vertical straight face on the wall</param>
      /// <param name="curves">curves compose the vertical face of the wall</param>
      /// <returns>is successful</returns>
      public bool GetWallGeom(Wall wall, ref Reference refer, ref IList<Curve> curves)
      {
         FaceArray faces = GeomUtil.GetFaces(wall);
         LocationCurve locCurve = wall.Location as LocationCurve;
         //unless API has bug, locCurve can't be null
         if (null == locCurve)
         {
            return false;
         }
         //check the location is line
         Line locLine = locCurve.Curve as Line;
         if (null == locLine)
         {
            return false;
         }

         //get the face reference
         foreach (Face face in faces)
         {
            if (GeomUtil.IsParallel(face, locLine))
            {
               refer = face.Reference;
               break;
            }
         }
         //can't find proper reference
         if (null == refer)
         {
            return false;
         }
         //check the analytical model profile is rectangular
         Document document = wall.Document;
         AnalyticalToPhysicalAssociationManager assocManager = AnalyticalToPhysicalAssociationManager.GetAnalyticalToPhysicalAssociationManager(document);
         AnalyticalPanel model = null;
         if (assocManager != null)
         {
            ElementId associatedElementId = assocManager.GetAssociatedElementId(wall.Id);
            if (associatedElementId != ElementId.InvalidElementId)
            {
               Element associatedElement = document.GetElement(associatedElementId);
               if (associatedElement != null && associatedElement is AnalyticalPanel)
               {
                  model = associatedElement as AnalyticalPanel;
               }
            }
         }
         if (null == model)
         {
            return false;
         }

         curves = model.GetOuterContour().ToList();

         if (!GeomUtil.IsRectangular(curves))
         {
            return false;
         }

         return true;
      }

      /// <summary>
      /// get necessary data when create AreaReinforcement on a horizontal floor
      /// </summary>
      /// <param name="floor">floor on which to create AreaReinforcemen</param>
      /// <param name="refer">reference of the horizontal face on the floor</param>
      /// <param name="curves">curves compose the horizontal face of the floor</param>
      /// <returns>is successful</returns>
      public bool GetFloorGeom(Floor floor, ref Reference refer, ref IList<Curve> curves)
      {
         //get horizontal face reference
         FaceArray faces = GeomUtil.GetFaces(floor);
         foreach (Face face in faces)
         {
            if (GeomUtil.IsHorizontalFace(face))
            {
               refer = face.Reference;
               break;
            }
         }
         //no proper reference
         if (null == refer)
         {
            return false;
         }

         //check the analytical model profile is rectangular
         //check the analytical model profile is rectangular
         Document document = floor.Document;
         AnalyticalToPhysicalAssociationManager assocManager = AnalyticalToPhysicalAssociationManager.GetAnalyticalToPhysicalAssociationManager(document);
         AnalyticalPanel model = null;
         if (assocManager != null)
         {
            ElementId associatedElementId = assocManager.GetAssociatedElementId(floor.Id);
            if (associatedElementId != ElementId.InvalidElementId)
            {
               Element associatedElement = document.GetElement(associatedElementId);
               if (associatedElement != null && associatedElement is AnalyticalPanel)
               {
                  model = associatedElement as AnalyticalPanel;
               }
            }
         }
         if (null == model)
         {
            return false;
         }
         curves = model.GetOuterContour().ToList();

         if (!GeomUtil.IsRectangular(curves))
         {
            return false;
         }

         return true;
      }
   }
}