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namespace Revit.SDK.Samples.CreateComplexAreaRein.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 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's reference
         FaceArray faces = GeomUtil.GetFaces(floor);
         foreach (Face face in faces)
         {
            if (GeomUtil.IsHorizontalFace(face))
            {
               refer = face.Reference;
               break;
            }
         }
         if (null == refer)
         {
            return false;
         }
         //get analytical model profile
         AnalyticalPanel model = null;
         Document document = floor.Document;
         AnalyticalToPhysicalAssociationManager assocManager = AnalyticalToPhysicalAssociationManager.GetAnalyticalToPhysicalAssociationManager(document);
         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;
         }
         curves = AddInlaidCurves(curves, 0.5);

         return true;
      }

      /// <summary>
      /// create CurveArray which contain 8 curves, 4 is exterior lines and 4 is interior lines
      /// </summary>
      /// <param name="curves"></param>
      /// <param name="scale"></param>
      /// <returns></returns>
      private IList<Curve> AddInlaidCurves(IList<Curve> curves, double scale)
        {
            //because curves is readonly, can't use method Curve.Append(Curve)
            List<Line> lines = new List<Line>();
            for (int i = 0; i < 4; i++)
            {
                Line temp = curves[i] as Line;
                lines.Add(temp);
            }

            //length and width of the rectangle
            double length = GeomUtil.GetLength(lines[0]);
            double width = GeomUtil.GetLength(lines[1]);
            for (int i = 0; i < 2; i++)
            {
                //height line
                Line tempLine1 = lines[i * 2];
                Line scaledLine1 = GeomUtil.GetScaledLine(tempLine1, scale);
                double distance1 = scale / 2 * width;
                Line movedLine1 = GeomUtil.GetXYParallelLine(scaledLine1, distance1);
                lines.Add(movedLine1);

                //width line
                Line tempLine2 = lines[i * 2 + 1];
                Line scaledLine2 = GeomUtil.GetScaledLine(tempLine2, scale);
                double distance2 = scale / 2 * length;
                Line movedLine2 = GeomUtil.GetXYParallelLine(scaledLine2, distance2);
                lines.Add(movedLine2);
            }

            //add all 8 lines into return array
            IList<Curve> allLines = new List<Curve>();
            for (int i = 0; i < 8; i++)
            {
                allLines.Add(lines[i]);
            }
            return allLines;
        }
    }
}