#if ACAD24
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Colors;
using AcAp = Autodesk.AutoCAD.ApplicationServices;
#elif BCAD
using Bricscad.EditorInput;
using Teigha.Geometry;
using Teigha.DatabaseServices;
using Teigha.Colors;
using AcAp = Bricscad.ApplicationServices;
#endif
using System;
using System.Collections.Generic;

namespace Boprs
{
	/// <summary>
	/// Simple closed polygon.
	/// </summary>
	public class Contour : ICloneable
	{
		public object Clone()
		{
			return new Contour() { Vertices = new List<Point2d>(Vertices) }; 
		}

		/// <summary>
		/// Vertices of the contour.
		/// </summary>
		public List<Point2d> Vertices { get; private set; }

		/// <summary>
		/// Are the vertices of the contour arranged in clockwise manner?
		/// </summary>
		/// <returns><c>true</c> if the contour is clockwise, <c>false</c> if counter-clockwise.</returns>
		public bool IsClockwise()
		{
			double areaSum = 0;

			// Go through all the vertices.
			for (int i = 0; i < Vertices.Count; i++)
			{
				// Get current vertex
				Point2d p0 = Vertices[i];

				// Get the next vertex
				Point2d p1 = Vertices[(i + 1) % Vertices.Count];

				// Compute the area under the trapezoid made by the current segment.
				// Note that this is actually double the proper value, but we only care about its relation to 0.
				areaSum += (p1.X - p0.X) * (p1.Y + p0.Y);
			}

			return areaSum > 0;
		}

		/// <summary>
		/// Reverse the orientation of the contour.
		/// </summary>
		public void Reverse()
		{
			Vertices.Reverse();
		}

		/// <summary>
		/// Constructor.
		/// </summary>
		public Contour()
		{
			Vertices = new List<Point2d>();
		}

#if DEBUG
		internal void Draw(Color color = null)
		{
			AcAp.Document acDoc = AcAp.Application.DocumentManager.MdiActiveDocument;
			Database acDb = acDoc.Database;

			using (Transaction acTrans = acDb.TransactionManager.StartTransaction())
			{
				// Open the BlockTableRecord
				BlockTable acBlkTbl = (BlockTable)acTrans.GetObject(acDb.BlockTableId, OpenMode.ForRead);
				BlockTableRecord acBlkTblRec =
					(BlockTableRecord)acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace], OpenMode.ForWrite);

				for(int i = 0; i < Vertices.Count; i++)
				{
					Line asLine = new Line(Vertices[i].To3d(), Vertices[(i + 1) % Vertices.Count].To3d());
					acBlkTblRec.AppendEntity(asLine);
					acTrans.AddNewlyCreatedDBObject(asLine, true);
				}

				acTrans.Commit();
			}
		}
#endif
	}
}