using System;
using UnityEngine;

[ExecuteInEditMode]
public class MegaAttach : MonoBehaviour
{
	[Serializable]
	public class MegaSkinVert
	{
		public float[] weights;

		public Transform[] bones;

		public Matrix4x4[] bindposes;

		public int vert;

		public MegaSkinVert()
		{
			weights = new float[4];
			bones = new Transform[4];
			bindposes = new Matrix4x4[4];
		}
	}

	public MegaModifiers target;

	[HideInInspector]
	public Vector3 BaryCoord = Vector3.zero;

	[HideInInspector]
	public int[] BaryVerts = new int[3];

	[HideInInspector]
	public bool attached;

	[HideInInspector]
	public Vector3 BaryCoord1 = Vector3.zero;

	[HideInInspector]
	public int[] BaryVerts1 = new int[3];

	public Vector3 attachforward = Vector3.forward;

	public Vector3 AxisRot = Vector3.zero;

	public float radius = 0.1f;

	public Vector3 up = Vector3.up;

	public bool worldSpace;

	private Vector3 pt = Vector3.zero;

	private Vector3 norm = Vector3.zero;

	public bool skinned;

	public bool updateRotation = true;

	public MegaSkinVert[] skinverts;

	public Quaternion attachrot = Quaternion.identity;

	private Vector3[] calcskinverts;

	[ContextMenu("Help")]
	public void Help()
	{
		Application.OpenURL("http://www.west-racing.com/mf/?page_id=2645");
	}

	public void DetachIt()
	{
		attached = false;
	}

	public void AttachIt()
	{
		if (!target)
		{
			return;
		}
		attached = true;
		if (!InitSkin())
		{
			Mesh mesh = target.mesh;
			Vector3 vector = target.transform.InverseTransformPoint(pt);
			Vector3[] sverts = target.sverts;
			int[] triangles = mesh.triangles;
			int index = -1;
			MegaNearestPointTest.NearestPointOnMesh1(vector, sverts, triangles, ref index, ref BaryCoord);
			if (index >= 0)
			{
				BaryVerts[0] = triangles[index];
				BaryVerts[1] = triangles[index + 1];
				BaryVerts[2] = triangles[index + 2];
			}
			MegaNearestPointTest.NearestPointOnMesh1(vector + attachforward, sverts, triangles, ref index, ref BaryCoord1);
			if (index >= 0)
			{
				BaryVerts1[0] = triangles[index];
				BaryVerts1[1] = triangles[index + 1];
				BaryVerts1[2] = triangles[index + 2];
			}
		}
	}

	public void AttachIt(Vector3 pos)
	{
		pt = pos;
		AttachIt();
	}

	private void OnDrawGizmosSelected()
	{
		pt = base.transform.position;
		Gizmos.color = Color.white;
		Gizmos.DrawSphere(pt, radius);
		if (!target || !target.mesh)
		{
			return;
		}
		if (attached)
		{
			SkinnedMeshRenderer component = target.GetComponent<SkinnedMeshRenderer>();
			if ((bool)component)
			{
				Vector3 position = base.transform.position;
				Vector3 center = position;
				Gizmos.color = Color.green;
				Gizmos.DrawSphere(center, radius);
			}
			else
			{
				Vector3 coordMine = GetCoordMine(target.sverts[BaryVerts[0]], target.sverts[BaryVerts[1]], target.sverts[BaryVerts[2]], BaryCoord);
				Vector3 vector = target.transform.TransformPoint(coordMine);
				Gizmos.color = Color.green;
				Gizmos.DrawSphere(vector, radius);
				Vector3 vector2 = target.transform.TransformDirection(norm * 40f);
				Gizmos.DrawLine(vector, vector + vector2);
			}
			return;
		}
		SkinnedMeshRenderer component2 = target.GetComponent<SkinnedMeshRenderer>();
		if ((bool)component2)
		{
			CalcSkinVerts();
			Mesh mesh = target.mesh;
			Vector3 vector3 = pt;
			Vector3[] array = calcskinverts;
			int[] triangles = mesh.triangles;
			int index = -1;
			Vector3 bary = Vector3.zero;
			Vector3 position2 = MegaNearestPointTest.NearestPointOnMesh1(vector3, array, triangles, ref index, ref bary);
			Vector3 vector4 = target.transform.TransformPoint(position2);
			if (index >= 0)
			{
				Vector3 coordMine2 = GetCoordMine(array[triangles[index]], array[triangles[index + 1]], array[triangles[index + 2]], bary);
				vector4 = coordMine2;
			}
			Gizmos.color = Color.red;
			Gizmos.DrawSphere(vector4, radius);
			Gizmos.color = Color.blue;
			position2 = MegaNearestPointTest.NearestPointOnMesh1(vector3 + attachforward, array, triangles, ref index, ref bary);
			Vector3 vector5 = position2;
			Gizmos.DrawSphere(vector5, radius);
			Gizmos.color = Color.yellow;
			Gizmos.DrawLine(vector4, vector5);
		}
		else
		{
			Mesh mesh2 = target.mesh;
			Vector3 vector6 = target.transform.InverseTransformPoint(pt);
			Vector3[] sverts = target.sverts;
			int[] triangles2 = mesh2.triangles;
			int index2 = -1;
			Vector3 bary2 = Vector3.zero;
			Vector3 position3 = MegaNearestPointTest.NearestPointOnMesh1(vector6, sverts, triangles2, ref index2, ref bary2);
			Vector3 vector7 = target.transform.TransformPoint(position3);
			if (index2 >= 0)
			{
				Vector3 coordMine3 = GetCoordMine(sverts[triangles2[index2]], sverts[triangles2[index2 + 1]], sverts[triangles2[index2 + 2]], bary2);
				vector7 = target.transform.TransformPoint(coordMine3);
			}
			Gizmos.color = Color.red;
			Gizmos.DrawSphere(vector7, radius);
			Gizmos.color = Color.blue;
			position3 = MegaNearestPointTest.NearestPointOnMesh1(vector6 + attachforward, sverts, triangles2, ref index2, ref bary2);
			Vector3 vector8 = target.transform.TransformPoint(position3);
			Gizmos.DrawSphere(vector8, radius);
			Gizmos.color = Color.yellow;
			Gizmos.DrawLine(vector7, vector8);
		}
	}

	private void LateUpdate()
	{
		if (!attached)
		{
			return;
		}
		if (skinned)
		{
			GetSkinPos1();
		}
		else if (worldSpace)
		{
			Vector3 vector = target.sverts[BaryVerts[0]];
			Vector3 vector2 = target.sverts[BaryVerts[1]];
			Vector3 vector3 = target.sverts[BaryVerts[2]];
			Vector3 vector4 = target.transform.localToWorldMatrix.MultiplyPoint(GetCoordMine(vector, vector2, vector3, BaryCoord));
			base.transform.position = vector4;
			if (updateRotation)
			{
				Vector3 lhs = vector2 - vector;
				Vector3 rhs = vector3 - vector2;
				norm = Vector3.Cross(lhs, rhs);
				vector = target.sverts[BaryVerts1[0]];
				vector2 = target.sverts[BaryVerts1[1]];
				vector3 = target.sverts[BaryVerts1[2]];
				Vector3 vector5 = target.transform.localToWorldMatrix.MultiplyPoint(GetCoordMine(vector, vector2, vector3, BaryCoord1)) - vector4;
				Quaternion quaternion = Quaternion.Euler(AxisRot);
				if (vector5 != Vector3.zero)
				{
					Quaternion rotation = Quaternion.LookRotation(vector5, norm) * quaternion;
					base.transform.rotation = rotation;
				}
			}
		}
		else
		{
			Vector3 vector6 = target.sverts[BaryVerts[0]];
			Vector3 vector7 = target.sverts[BaryVerts[1]];
			Vector3 vector8 = target.sverts[BaryVerts[2]];
			Vector3 coordMine = GetCoordMine(vector6, vector7, vector8, BaryCoord);
			base.transform.localPosition = coordMine;
			if (updateRotation)
			{
				Vector3 lhs2 = vector7 - vector6;
				Vector3 rhs2 = vector8 - vector7;
				norm = Vector3.Cross(lhs2, rhs2);
				vector6 = target.sverts[BaryVerts1[0]];
				vector7 = target.sverts[BaryVerts1[1]];
				vector8 = target.sverts[BaryVerts1[2]];
				Vector3 forward = GetCoordMine(vector6, vector7, vector8, BaryCoord1) - coordMine;
				Quaternion quaternion2 = Quaternion.Euler(AxisRot);
				Quaternion localRotation = Quaternion.LookRotation(forward, norm) * quaternion2;
				base.transform.localRotation = localRotation;
			}
		}
	}

	private Vector3 GetCoordMine(Vector3 A, Vector3 B, Vector3 C, Vector3 bary)
	{
		Vector3 zero = Vector3.zero;
		zero.x = bary.x * A.x + bary.y * B.x + bary.z * C.x;
		zero.y = bary.x * A.y + bary.y * B.y + bary.z * C.y;
		zero.z = bary.x * A.z + bary.y * B.z + bary.z * C.z;
		return zero;
	}

	private bool InitSkin()
	{
		if ((bool)target)
		{
			SkinnedMeshRenderer component = target.GetComponent<SkinnedMeshRenderer>();
			if ((bool)component)
			{
				Quaternion rotation = base.transform.rotation;
				attachrot = Quaternion.identity;
				skinned = true;
				Mesh sharedMesh = component.sharedMesh;
				Vector3 position = base.transform.position;
				CalcSkinVerts();
				Vector3 vector = position;
				Vector3[] verts = calcskinverts;
				int[] triangles = sharedMesh.triangles;
				int index = -1;
				MegaNearestPointTest.NearestPointOnMesh1(vector, verts, triangles, ref index, ref BaryCoord);
				if (index >= 0)
				{
					BaryVerts[0] = triangles[index];
					BaryVerts[1] = triangles[index + 1];
					BaryVerts[2] = triangles[index + 2];
				}
				MegaNearestPointTest.NearestPointOnMesh1(vector + attachforward, verts, triangles, ref index, ref BaryCoord1);
				if (index >= 0)
				{
					BaryVerts1[0] = triangles[index];
					BaryVerts1[1] = triangles[index + 1];
					BaryVerts1[2] = triangles[index + 2];
				}
				skinverts = new MegaSkinVert[6];
				for (int i = 0; i < 3; i++)
				{
					int num = BaryVerts[i];
					BoneWeight boneWeight = sharedMesh.boneWeights[num];
					skinverts[i] = new MegaSkinVert();
					skinverts[i].vert = num;
					skinverts[i].weights[0] = boneWeight.weight0;
					skinverts[i].weights[1] = boneWeight.weight1;
					skinverts[i].weights[2] = boneWeight.weight2;
					skinverts[i].weights[3] = boneWeight.weight3;
					skinverts[i].bones[0] = component.bones[boneWeight.boneIndex0];
					skinverts[i].bones[1] = component.bones[boneWeight.boneIndex1];
					skinverts[i].bones[2] = component.bones[boneWeight.boneIndex2];
					skinverts[i].bones[3] = component.bones[boneWeight.boneIndex3];
					skinverts[i].bindposes[0] = sharedMesh.bindposes[boneWeight.boneIndex0];
					skinverts[i].bindposes[1] = sharedMesh.bindposes[boneWeight.boneIndex1];
					skinverts[i].bindposes[2] = sharedMesh.bindposes[boneWeight.boneIndex2];
					skinverts[i].bindposes[3] = sharedMesh.bindposes[boneWeight.boneIndex3];
				}
				for (int j = 3; j < 6; j++)
				{
					int num2 = BaryVerts1[j - 3];
					BoneWeight boneWeight2 = sharedMesh.boneWeights[num2];
					skinverts[j] = new MegaSkinVert();
					skinverts[j].vert = num2;
					skinverts[j].weights[0] = boneWeight2.weight0;
					skinverts[j].weights[1] = boneWeight2.weight1;
					skinverts[j].weights[2] = boneWeight2.weight2;
					skinverts[j].weights[3] = boneWeight2.weight3;
					skinverts[j].bones[0] = component.bones[boneWeight2.boneIndex0];
					skinverts[j].bones[1] = component.bones[boneWeight2.boneIndex1];
					skinverts[j].bones[2] = component.bones[boneWeight2.boneIndex2];
					skinverts[j].bones[3] = component.bones[boneWeight2.boneIndex3];
					skinverts[j].bindposes[0] = sharedMesh.bindposes[boneWeight2.boneIndex0];
					skinverts[j].bindposes[1] = sharedMesh.bindposes[boneWeight2.boneIndex1];
					skinverts[j].bindposes[2] = sharedMesh.bindposes[boneWeight2.boneIndex2];
					skinverts[j].bindposes[3] = sharedMesh.bindposes[boneWeight2.boneIndex3];
				}
				GetSkinPos1();
				attachrot = Quaternion.Inverse(base.transform.rotation) * rotation;
				return true;
			}
			skinned = false;
		}
		return false;
	}

	private Vector3 GetSkinPos(int i)
	{
		Vector3 point = target.sverts[skinverts[i].vert];
		Vector3 position = skinverts[i].bindposes[0].MultiplyPoint(point);
		Vector3 vector = skinverts[i].bones[0].TransformPoint(position) * skinverts[i].weights[0];
		position = skinverts[i].bindposes[1].MultiplyPoint(point);
		vector += skinverts[i].bones[1].TransformPoint(position) * skinverts[i].weights[1];
		position = skinverts[i].bindposes[2].MultiplyPoint(point);
		vector += skinverts[i].bones[2].TransformPoint(position) * skinverts[i].weights[2];
		position = skinverts[i].bindposes[3].MultiplyPoint(point);
		return vector + skinverts[i].bones[3].TransformPoint(position) * skinverts[i].weights[3];
	}

	private void CalcSkinVerts()
	{
		if (calcskinverts == null || calcskinverts.Length != target.sverts.Length)
		{
			calcskinverts = new Vector3[target.sverts.Length];
		}
		SkinnedMeshRenderer component = target.GetComponent<SkinnedMeshRenderer>();
		Mesh mesh = target.mesh;
		Matrix4x4[] bindposes = mesh.bindposes;
		BoneWeight[] boneWeights = mesh.boneWeights;
		for (int i = 0; i < target.sverts.Length; i++)
		{
			Vector3 zero = Vector3.zero;
			Vector3 point = target.sverts[i];
			Vector3 position = bindposes[boneWeights[i].boneIndex0].MultiplyPoint(point);
			zero += component.bones[boneWeights[i].boneIndex0].TransformPoint(position) * boneWeights[i].weight0;
			position = bindposes[boneWeights[i].boneIndex1].MultiplyPoint(point);
			zero += component.bones[boneWeights[i].boneIndex1].TransformPoint(position) * boneWeights[i].weight1;
			position = bindposes[boneWeights[i].boneIndex2].MultiplyPoint(point);
			zero += component.bones[boneWeights[i].boneIndex2].TransformPoint(position) * boneWeights[i].weight2;
			position = bindposes[boneWeights[i].boneIndex3].MultiplyPoint(point);
			zero += component.bones[boneWeights[i].boneIndex3].TransformPoint(position) * boneWeights[i].weight3;
			calcskinverts[i] = zero;
		}
	}

	private void GetSkinPos1()
	{
		Vector3 skinPos = GetSkinPos(0);
		Vector3 skinPos2 = GetSkinPos(1);
		Vector3 skinPos3 = GetSkinPos(2);
		Vector3 coordMine = GetCoordMine(skinPos, skinPos2, skinPos3, BaryCoord);
		base.transform.position = coordMine;
		Vector3 lhs = skinPos2 - skinPos;
		Vector3 rhs = skinPos3 - skinPos2;
		norm = Vector3.Cross(lhs, rhs);
		skinPos = GetSkinPos(3);
		skinPos2 = GetSkinPos(4);
		skinPos3 = GetSkinPos(5);
		Vector3 forward = GetCoordMine(skinPos, skinPos2, skinPos3, BaryCoord1) - coordMine;
		Quaternion quaternion = Quaternion.Euler(AxisRot);
		Quaternion rotation = Quaternion.LookRotation(forward, norm) * quaternion * attachrot;
		base.transform.rotation = rotation;
	}
}