using System;
using System.Collections.Generic;
using TriangleNet.Data;
using TriangleNet.Geometry;
using TriangleNet.Log;

namespace TriangleNet.IO
{
	// Token: 0x02000024 RID: 36
	internal static class DataReader
	{
		// Token: 0x06000128 RID: 296 RVA: 0x00015400 File Offset: 0x00013600
		public static int Reconstruct(Mesh mesh, InputGeometry input, ITriangle[] triangles)
		{
			int num = 0;
			Otri otri = default(Otri);
			Otri otri2 = default(Otri);
			Otri otri3 = default(Otri);
			Otri otri4 = default(Otri);
			Otri otri5 = default(Otri);
			Osub osub = default(Osub);
			int[] array = new int[3];
			int[] array2 = new int[2];
			int num2 = ((triangles == null) ? 0 : triangles.Length);
			int count = input.segments.Count;
			mesh.inelements = num2;
			mesh.regions.AddRange(input.regions);
			int i;
			for (i = 0; i < mesh.inelements; i++)
			{
				mesh.MakeTriangle(ref otri);
			}
			if (mesh.behavior.Poly)
			{
				mesh.insegments = count;
				for (i = 0; i < mesh.insegments; i++)
				{
					mesh.MakeSegment(ref osub);
				}
			}
			List<Otri>[] array3 = new List<Otri>[mesh.vertices.Count];
			for (i = 0; i < mesh.vertices.Count; i++)
			{
				Otri otri6 = default(Otri);
				otri6.triangle = Mesh.dummytri;
				array3[i] = new List<Otri>(3);
				array3[i].Add(otri6);
			}
			i = 0;
			foreach (Triangle triangle in mesh.triangles.Values)
			{
				otri.triangle = triangle;
				array[0] = triangles[i].P0;
				array[1] = triangles[i].P1;
				array[2] = triangles[i].P2;
				for (int j = 0; j < 3; j++)
				{
					if (array[j] < 0 || array[j] >= mesh.invertices)
					{
						SimpleLog.Instance.Error("Triangle has an invalid vertex index.", "MeshReader.Reconstruct()");
						throw new Exception("Triangle has an invalid vertex index.");
					}
				}
				otri.triangle.region = triangles[i].Region;
				if (mesh.behavior.VarArea)
				{
					otri.triangle.area = triangles[i].Area;
				}
				otri.orient = 0;
				otri.SetOrg(mesh.vertices[array[0]]);
				otri.SetDest(mesh.vertices[array[1]]);
				otri.SetApex(mesh.vertices[array[2]]);
				otri.orient = 0;
				while (otri.orient < 3)
				{
					int num3 = array[otri.orient];
					int num4 = array3[num3].Count - 1;
					Otri otri7 = array3[num3][num4];
					array3[num3].Add(otri);
					otri3 = otri7;
					if (otri3.triangle != Mesh.dummytri)
					{
						Vertex vertex = otri.Dest();
						Vertex vertex2 = otri.Apex();
						do
						{
							Vertex vertex3 = otri3.Dest();
							Vertex vertex4 = otri3.Apex();
							if (vertex2 == vertex3)
							{
								otri.Lprev(ref otri2);
								otri2.Bond(ref otri3);
							}
							if (vertex == vertex4)
							{
								otri3.Lprev(ref otri4);
								otri.Bond(ref otri4);
							}
							num4--;
							otri7 = array3[num3][num4];
							otri3 = otri7;
						}
						while (otri3.triangle != Mesh.dummytri);
					}
					otri.orient++;
				}
				i++;
			}
			num = 0;
			if (mesh.behavior.Poly)
			{
				i = 0;
				foreach (Segment segment in mesh.subsegs.Values)
				{
					osub.seg = segment;
					array2[0] = input.segments[i].P0;
					array2[1] = input.segments[i].P1;
					int boundary = input.segments[i].Boundary;
					for (int k = 0; k < 2; k++)
					{
						if (array2[k] < 0 || array2[k] >= mesh.invertices)
						{
							SimpleLog.Instance.Error("Segment has an invalid vertex index.", "MeshReader.Reconstruct()");
							throw new Exception("Segment has an invalid vertex index.");
						}
					}
					osub.orient = 0;
					Vertex vertex5 = mesh.vertices[array2[0]];
					Vertex vertex6 = mesh.vertices[array2[1]];
					osub.SetOrg(vertex5);
					osub.SetDest(vertex6);
					osub.SetSegOrg(vertex5);
					osub.SetSegDest(vertex6);
					osub.seg.boundary = boundary;
					osub.orient = 0;
					while (osub.orient < 2)
					{
						int num3 = array2[1 - osub.orient];
						int num5 = array3[num3].Count - 1;
						Otri otri8 = array3[num3][num5];
						Otri otri7 = array3[num3][num5];
						otri3 = otri7;
						Vertex vertex7 = osub.Org();
						bool flag = true;
						while (flag && otri3.triangle != Mesh.dummytri)
						{
							Vertex vertex3 = otri3.Dest();
							if (vertex7 == vertex3)
							{
								array3[num3].Remove(otri8);
								otri3.SegBond(ref osub);
								otri3.Sym(ref otri5);
								if (otri5.triangle == Mesh.dummytri)
								{
									mesh.InsertSubseg(ref otri3, 1);
									num++;
								}
								flag = false;
							}
							num5--;
							otri8 = array3[num3][num5];
							otri7 = array3[num3][num5];
							otri3 = otri7;
						}
						osub.orient++;
					}
					i++;
				}
			}
			for (i = 0; i < mesh.vertices.Count; i++)
			{
				int num6 = array3[i].Count - 1;
				Otri otri7 = array3[i][num6];
				otri3 = otri7;
				while (otri3.triangle != Mesh.dummytri)
				{
					num6--;
					otri7 = array3[i][num6];
					otri3.SegDissolve();
					otri3.Sym(ref otri5);
					if (otri5.triangle == Mesh.dummytri)
					{
						mesh.InsertSubseg(ref otri3, 1);
						num++;
					}
					otri3 = otri7;
				}
			}
			return num;
		}
	}
}