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using System;
using System.Collections.Generic;
using System.Text;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace Revit.SDK.Samples.ShaftHolePuncher.CS
{
   /// <summary>
   /// ProfileBeam class contains the information about profile of beam,
   /// and contains method used to create opening on a beam.
   /// </summary>
   public class ProfileBeam : Profile
   {
      private FamilyInstance m_data = null; //beam
      //store the transform used to change points in beam coordinate system to Revit coordinate system
      Transform m_beamTransform = null;
      bool m_isZaxis = true; //decide whether to create opening on Zaxis of beam or Yaixs of beam
      //if m_haveOpening is true means beam has already had opening on it
      //then the points get from get_Geometry(Option) do not need to be transformed 
      //by the Transform get from Instance object anymore.
      bool m_haveOpening = false;
      Matrix4 m_MatrixZaxis = null; //transform points to plane whose normal is Zaxis of beam
      Matrix4 m_MatrixYaxis = null; //transform points to plane whose normal is Yaxis of beam

      /// <summary>
      /// constructor
      /// </summary>
      /// <param name="beam">beam to create opening on</param>
      /// <param name="commandData">object which contains reference to Revit Application</param>
      public ProfileBeam(FamilyInstance beam, ExternalCommandData commandData)
         : base(commandData)
      {
         m_data = beam;
         List<List<Edge>> faces = GetFaces(m_data);
         m_points = GetNeedPoints(faces);
         m_to2DMatrix = GetTo2DMatrix();
         m_moveToCenterMatrix = ToCenterMatrix();
      }

      /// <summary>
      /// Get points of the first face
      /// </summary>
      /// <param name="faces">edges in all faces</param>
      /// <returns>points of first face</returns>
      public override List<List<XYZ>> GetNeedPoints(List<List<Edge>> faces)
      {
         List<List<XYZ>> needPoints = new List<List<XYZ>>();
         for (int i = 0; i < faces.Count; i++)
         {
            foreach (Edge edge in faces[i])
            {
               List<XYZ> edgexyzs = edge.Tessellate() as List<XYZ>;
               if (false == m_haveOpening)
               {
                  List<XYZ> transformedPoints = new List<XYZ>();
                  for (int j = 0; j < edgexyzs.Count; j++)
                  {
                     Autodesk.Revit.DB.XYZ xyz = edgexyzs[j];
                     Autodesk.Revit.DB.XYZ transformedXYZ = m_beamTransform.OfPoint(xyz);
                     transformedPoints.Add(transformedXYZ);
                  }
                  edgexyzs = transformedPoints;
               }
               needPoints.Add(edgexyzs);
            }
         }
         return needPoints;
      }

      /// <summary>
      /// Get the bound of a face
      /// </summary>
      /// <returns>points array stores the bound of the face</returns>
      public override PointF[] GetFaceBounds()
      {
         Matrix4 matrix = m_to2DMatrix;
         Matrix4 inverseMatrix = matrix.Inverse();
         float minX = 0, maxX = 0, minY = 0, maxY = 0;
         bool bFirstPoint = true;

         //get the max and min point on the face
         for (int i = 0; i < m_points.Count; i++)
         {
            List<XYZ> points = m_points[i];
            foreach (Autodesk.Revit.DB.XYZ point in points)
            {
               Vector4 v = new Vector4(point);
               Vector4 v1 = inverseMatrix.Transform(v);

               if (bFirstPoint)
               {
                  minX = maxX = v1.X;
                  minY = maxY = v1.Y;
                  bFirstPoint = false;
               }
               else
               {
                  if (v1.X < minX)
                  {
                     minX = v1.X;
                  }
                  else if (v1.X > maxX)
                  {
                     maxX = v1.X;
                  }

                  if (v1.Y < minY)
                  {
                     minY = v1.Y;
                  }
                  else if (v1.Y > maxY)
                  {
                     maxY = v1.Y;
                  }
               }
            }
         }
         //return an array with max and min value of face
         PointF[] resultPoints = new PointF[2] { 
                new PointF(minX, minY), new PointF(maxX, maxY) };
         return resultPoints;
      }

      /// <summary>
      /// Get a matrix which can transform points to 2D
      /// </summary>
      /// <returns>matrix which can transform points to 2D</returns>
      public override Matrix4 GetTo2DMatrix()
      {
         //get transform used to transform points to plane whose normal is Zaxis of beam
         Vector4 xAxis = new Vector4(m_data.HandOrientation);
         xAxis.Normalize();
         //Because Y axis in windows UI is downward, so we should Multiply(-1) here
         Vector4 yAxis = new Vector4(m_data.FacingOrientation.Multiply(-1));
         yAxis.Normalize();
         Vector4 zAxis = yAxis.CrossProduct(xAxis);
         zAxis.Normalize();

         Vector4 vOrigin = new Vector4(m_points[0][0]);
         Matrix4 result = new Matrix4(xAxis, yAxis, zAxis, vOrigin);
         m_MatrixZaxis = result;

         //get transform used to transform points to plane whose normal is Yaxis of beam
         xAxis = new Vector4(m_data.HandOrientation);
         xAxis.Normalize();
         zAxis = new Vector4(m_data.FacingOrientation);
         zAxis.Normalize();
         yAxis = (xAxis.CrossProduct(zAxis)) * (-1);
         yAxis.Normalize();
         result = new Matrix4(xAxis, yAxis, zAxis, vOrigin);
         m_MatrixYaxis = result;
         return m_MatrixZaxis;
      }

      /// <summary>
      /// Get edges of element's profile
      /// </summary>
      /// <param name="elem">selected element</param>
      /// <returns>all the faces in the selected Element</returns>
      public override List<List<Edge>> GetFaces(Autodesk.Revit.DB.Element elem)
      {
         List<List<Edge>> faceEdges = new List<List<Edge>>();
         Options options = m_appCreator.NewGeometryOptions();
         options.DetailLevel = ViewDetailLevel.Medium;
         //make sure references to geometric objects are computed.
         options.ComputeReferences = true;
         Autodesk.Revit.DB.GeometryElement geoElem = elem.get_Geometry(options);
         //GeometryObjectArray gObjects = geoElem.Objects;
         IEnumerator<GeometryObject> Objects = geoElem.GetEnumerator();
         //get all the edges in the Geometry object
         //foreach (GeometryObject geo in gObjects)
         while (Objects.MoveNext())
         {
            GeometryObject geo = Objects.Current;

            //if beam doesn't contain opening on it, then we can get edges from instance
            //and the points we get should be transformed by instance.Tranceform
            if (geo is Autodesk.Revit.DB.GeometryInstance)
            {
               Autodesk.Revit.DB.GeometryInstance instance = geo as Autodesk.Revit.DB.GeometryInstance;
               m_beamTransform = instance.Transform;
               Autodesk.Revit.DB.GeometryElement elemGeo = instance.SymbolGeometry;
               //GeometryObjectArray objectsGeo = elemGeo.Objects;
               IEnumerator<GeometryObject> Objects1 = elemGeo.GetEnumerator();
               //foreach (GeometryObject objGeo in objectsGeo)
               while (Objects1.MoveNext())
               {
                  GeometryObject objGeo = Objects1.Current;

                  Solid solid = objGeo as Solid;
                  if (null != solid)
                  {
                     FaceArray faces = solid.Faces;
                     foreach (Face face in faces)
                     {
                        EdgeArrayArray edgeArrarr = face.EdgeLoops;
                        foreach (EdgeArray edgeArr in edgeArrarr)
                        {
                           List<Edge> edgesList = new List<Edge>();
                           foreach (Edge edge in edgeArr)
                           {
                              edgesList.Add(edge);
                           }
                           faceEdges.Add(edgesList);
                        }
                     }
                  }
               }
            }
            //if beam contains opening on it, then we can get edges from solid
            //and the points we get do not need transform anymore
            else if (geo is Autodesk.Revit.DB.Solid)
            {
               m_haveOpening = true;
               Solid solid = geo as Solid;
               FaceArray faces = solid.Faces;
               foreach (Face face in faces)
               {
                  EdgeArrayArray edgeArrarr = face.EdgeLoops;
                  foreach (EdgeArray edgeArr in edgeArrarr)
                  {
                     List<Edge> edgesList = new List<Edge>();
                     foreach (Edge edge in edgeArr)
                     {
                        edgesList.Add(edge);
                     }
                     faceEdges.Add(edgesList);
                  }
               }
            }
         }
         return faceEdges;
      }

      /// <summary>
      /// Create Opening on beam
      /// </summary>
      /// <param name="points">points used to create Opening</param>
      /// <returns>newly created Opening</returns>
      public override Opening CreateOpening(List<Vector4> points)
      {
         Autodesk.Revit.DB.XYZ p1, p2; Line curve;
         CurveArray curves = m_appCreator.NewCurveArray();
         for (int i = 0; i < points.Count - 1; i++)
         {
            p1 = new Autodesk.Revit.DB.XYZ(points[i].X, points[i].Y, points[i].Z);
            p2 = new Autodesk.Revit.DB.XYZ(points[i + 1].X, points[i + 1].Y, points[i + 1].Z);
            curve = Line.CreateBound(p1, p2);
            curves.Append(curve);
         }

         //close the curve
         p1 = new Autodesk.Revit.DB.XYZ(points[0].X, points[0].Y, points[0].Z);
         p2 = new Autodesk.Revit.DB.XYZ(points[points.Count - 1].X, points[points.Count - 1].Y, points[points.Count - 1].Z);
         curve = Line.CreateBound(p1, p2);
         curves.Append(curve);

         if (false == m_isZaxis)
         {
            return m_docCreator.NewOpening(m_data, curves, Autodesk.Revit.Creation.eRefFace.CenterY);
         }
         else
         {
            return m_docCreator.NewOpening(m_data, curves, Autodesk.Revit.Creation.eRefFace.CenterZ);
         }

      }

      /// <summary>
      /// Change transform matrix used to transform points to 2d.
      /// </summary>
      /// <param name="isZaxis">transform points to which plane.
      /// true means transform points to plane whose normal is Zaxis of beam.
      /// false means transform points to plane whose normal is Yaxis of beam
      /// </param>
      public void ChangeTransformMatrix(bool isZaxis)
      {
         m_isZaxis = isZaxis;
         if (isZaxis)
         {
            m_to2DMatrix = m_MatrixZaxis;
         }
         else
         {
            m_to2DMatrix = m_MatrixYaxis;
         }
         //re-calculate matrix used to move points to center
         m_moveToCenterMatrix = ToCenterMatrix();
      }
   }
}