using System.Collections.Generic;
using TriangleNet.Geometry;
using TriangleNet.Topology;

namespace TriangleNet.Meshing.Algorithm
{
	public class Incremental : ITriangulator
	{
		private Mesh mesh;

		public IMesh Triangulate(IList<Vertex> points, Configuration config)
		{
			mesh = new Mesh(config);
			mesh.TransferNodes(points);
			Otri searchtri = default(Otri);
			GetBoundingBox();
			foreach (Vertex value in mesh.vertices.Values)
			{
				searchtri.tri = mesh.dummytri;
				Osub splitseg = default(Osub);
				if (mesh.InsertVertex(value, ref searchtri, ref splitseg, segmentflaws: false, triflaws: false) == InsertVertexResult.Duplicate)
				{
					if (Log.Verbose)
					{
						Log.Instance.Warning("A duplicate vertex appeared and was ignored.", "Incremental.Triangulate()");
					}
					value.type = VertexType.UndeadVertex;
					mesh.undeads++;
				}
			}
			mesh.hullsize = RemoveBox();
			return mesh;
		}

		private void GetBoundingBox()
		{
			Otri newotri = default(Otri);
			Rectangle bounds = mesh.bounds;
			double num = bounds.Width;
			if (bounds.Height > num)
			{
				num = bounds.Height;
			}
			if (num == 0.0)
			{
				num = 1.0;
			}
			mesh.infvertex1 = new Vertex(bounds.Left - 50.0 * num, bounds.Bottom - 40.0 * num);
			mesh.infvertex2 = new Vertex(bounds.Right + 50.0 * num, bounds.Bottom - 40.0 * num);
			mesh.infvertex3 = new Vertex(0.5 * (bounds.Left + bounds.Right), bounds.Top + 60.0 * num);
			mesh.MakeTriangle(ref newotri);
			newotri.SetOrg(mesh.infvertex1);
			newotri.SetDest(mesh.infvertex2);
			newotri.SetApex(mesh.infvertex3);
			mesh.dummytri.neighbors[0] = newotri;
		}

		private int RemoveBox()
		{
			Otri ot = default(Otri);
			Otri ot2 = default(Otri);
			Otri ot3 = default(Otri);
			Otri ot4 = default(Otri);
			Otri ot5 = default(Otri);
			Otri ot6 = default(Otri);
			bool flag = !mesh.behavior.Poly;
			ot4.tri = mesh.dummytri;
			ot4.orient = 0;
			ot4.Sym();
			ot4.Lprev(ref ot5);
			ot4.Lnext();
			ot4.Sym();
			ot4.Lprev(ref ot2);
			ot2.Sym();
			ot4.Lnext(ref ot3);
			ot3.Sym();
			if (ot3.tri.id == -1)
			{
				ot2.Lprev();
				ot2.Sym();
			}
			mesh.dummytri.neighbors[0] = ot2;
			int num = -2;
			while (!ot4.Equals(ot5))
			{
				num++;
				ot4.Lprev(ref ot6);
				ot6.Sym();
				if (flag && ot6.tri.id != -1)
				{
					Vertex vertex = ot6.Org();
					if (vertex.label == 0)
					{
						vertex.label = 1;
					}
				}
				ot6.Dissolve(mesh.dummytri);
				ot4.Lnext(ref ot);
				ot.Sym(ref ot4);
				mesh.TriangleDealloc(ot.tri);
				if (ot4.tri.id == -1)
				{
					ot6.Copy(ref ot4);
				}
			}
			mesh.TriangleDealloc(ot5.tri);
			return num;
		}
	}
}