//
// (C) Copyright 2003-2019 by Autodesk, Inc.
//
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// Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
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//
using System;
using System.Collections.Generic;
using System.Text;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.DB.Structure;
using Autodesk.Revit;
using System.Drawing;
using Point = System.Drawing.Point;

namespace Revit.SDK.Samples.NewPathReinforcement.CS
{
   /// <summary>
   /// base class of ProfileFloor and ProfileWall
   /// contains the profile information and can make matrix to transform point to 2D plane
   /// </summary>
   public abstract class Profile
   {
      #region class member variables
      /// <summary>
      /// store all the points on the needed face
      /// </summary>
      protected List<List<XYZ>> m_points;

      /// <summary>
      /// object which contains reference to Revit Application
      /// </summary>
      protected Autodesk.Revit.UI.ExternalCommandData m_commandData;

      /// <summary>
      /// used to create new instances of utility objects. 
      /// </summary>
      protected Autodesk.Revit.Creation.Application m_appCreator;

      /// <summary>
      /// Revit DB document
      /// </summary>
      protected Autodesk.Revit.DB.Document m_document;

      /// <summary>
      /// store the Matrix used to transform 3D points to 2D
      /// </summary>
      protected Matrix4 m_to2DMatrix = null;
      #endregion

      /// <summary>
      /// CommandData property get object which contains reference to Revit Application
      /// </summary>
      public Autodesk.Revit.UI.ExternalCommandData CommandData
      {
         get
         {
            return m_commandData;
         }
      }

      /// <summary>
      /// To2DMatrix property to get Matrix used to transform 3D points to 2D
      /// </summary>
      public Matrix4 To2DMatrix
      {
         get
         {
            return m_to2DMatrix;
         }
      }

      /// <summary>
      /// constructor
      /// </summary>
      /// <param name="commandData">object which contains reference to Revit Application</param>
      protected Profile(ExternalCommandData commandData)
      {
         m_commandData = commandData;
         m_appCreator = m_commandData.Application.Application.Create;
         m_document = m_commandData.Application.ActiveUIDocument.Document;
      }

      /// <summary>
      /// abstract method to create PathReinforcement
      /// </summary>
      /// <returns>new created PathReinforcement</returns>
      /// <param name="points">points used to create PathReinforcement</param>
      /// <param name="flip">used to specify whether new PathReinforcement is Filp</param>
      public abstract PathReinforcement CreatePathReinforcement(List<Vector4> points, bool flip);

      /// <summary>
      /// Get points in first face
      /// </summary>
      /// <param name="faces">edges in all faces</param>
      /// <returns>points in first face</returns>
      public abstract List<List<XYZ>> GetNeedPoints(List<List<Edge>> faces);

      /// <summary>
      /// Get a matrix which can transform points to 2D
      /// </summary>
      public abstract Matrix4 GetTo2DMatrix();

      /// <summary>
      /// draw profile of wall or floor in 2D
      /// </summary>
      /// <param name="graphics">form graphic</param>
      /// <param name="pen">pen used to draw line in pictureBox</param>
      /// <param name="matrix4">Matrix used to transform 3d to 2d 
      /// and make picture in right scale </param>
      public void Draw2D(Graphics graphics, Pen pen, Matrix4 matrix4)
      {
         for (int i = 0; i < m_points.Count; i++)
         {
            List<XYZ> points = m_points[i];
            for (int j = 0; j < points.Count - 1; j++)
            {
               Autodesk.Revit.DB.XYZ point1 = points[j];
               Autodesk.Revit.DB.XYZ point2 = points[j + 1];

               Vector4 v1 = new Vector4(point1);
               Vector4 v2 = new Vector4(point2);

               v1 = matrix4.Transform(v1);
               v2 = matrix4.Transform(v2);
               graphics.DrawLine(pen, new Point((int)v1.X, (int)v1.Y),
                   new Point((int)v2.X, (int)v2.Y));
            }
         }
      }

      /// <summary>
      /// Get edges of element's profile
      /// </summary>
      /// <param name="elem">selected element</param>
      /// <returns>all the faces in the selected Element</returns>
      public 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;
         options.ComputeReferences = true; //make sure references to geometric objects are computed.
         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;

            Solid solid = geo as Solid;
            if (solid != null)
            {
               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>
      /// Get normal of face
      /// </summary>
      /// <param name="face">edges in a face</param>
      /// <returns>vector stands for normal of the face</returns>
      public Vector4 GetFaceNormal(List<Edge> face)
      {
         Edge eg0 = face[0];
         Edge eg1 = face[1];

         //get two lines from the face
         List<XYZ> points = eg0.Tessellate() as List<XYZ>;
         Autodesk.Revit.DB.XYZ start = points[0];
         Autodesk.Revit.DB.XYZ end = points[1];

         Vector4 vStart = new Vector4((float)start.X, (float)start.Y, (float)start.Z);
         Vector4 vEnd = new Vector4((float)end.X, (float)end.Y, (float)end.Z);
         Vector4 vSub = vEnd - vStart;

         points = eg1.Tessellate() as List<XYZ>;
         start = points[0];
         end = points[1];

         vStart = new Vector4((float)start.X, (float)start.Y, (float)start.Z);
         vEnd = new Vector4((float)end.X, (float)end.Y, (float)end.Z);
         Vector4 vSub2 = vEnd - vStart;

         //get the normal with two lines got from face
         Vector4 result = vSub.CrossProduct(vSub2);
         result.Normalize();
         return result;
      }

      /// <summary>
      /// Get a matrix which can move points to center
      /// </summary>
      /// <returns>matrix used to move point to center of graphics</returns>
      public Matrix4 ToCenterMatrix()
      {
         //translate the origin to bound center
         PointF[] bounds = GetFaceBounds();
         PointF min = bounds[0];
         PointF max = bounds[1];
         PointF center = new PointF((min.X + max.X) / 2, (min.Y + max.Y) / 2);
         return new Matrix4(new Vector4(center.X, center.Y, 0));
      }

      /// <summary>
      /// Get the bound of a face
      /// </summary>
      /// <returns>points array store the bound of the face</returns>
      public 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;
      }
   }
}