using System;
using UnityEngine;

[AddComponentMenu("Modifiers/Twist")]
public class MegaTwist : MegaModifier
{
	public float angle;

	public bool doRegion;

	public float from;

	public float to;

	public float Bias;

	public MegaAxis axis;

	private bool doBias;

	private float height;

	private float angleOverHeight;

	private float theAngle;

	private float bias;

	private Matrix4x4 mat = default(Matrix4x4);

	public override string ModName()
	{
		return "Twist";
	}

	public override string GetHelpURL()
	{
		return "?page_id=341";
	}

	private void CalcHeight(MegaAxis axis, float angle, MegaBox3 bbx)
	{
		switch (axis)
		{
		case MegaAxis.X:
			height = bbx.max.x - bbx.min.x;
			break;
		case MegaAxis.Z:
			height = bbx.max.y - bbx.min.y;
			break;
		case MegaAxis.Y:
			height = bbx.max.z - bbx.min.z;
			break;
		}
		if (height == 0f)
		{
			theAngle = 0f;
			angleOverHeight = 0f;
		}
		else
		{
			theAngle = angle;
			angleOverHeight = angle / height;
		}
	}

	public override Vector3 Map(int i, Vector3 p)
	{
		if (theAngle == 0f)
		{
			return p;
		}
		p = tm.MultiplyPoint3x4(p);
		float x = p.x;
		float z = p.z;
		float num = ((!doRegion) ? p.y : ((p.y < from) ? from : ((!(p.y > to)) ? p.y : to)));
		float num3;
		if (doBias)
		{
			float num2 = num / height;
			num3 = theAngle * Mathf.Pow(Mathf.Abs(num2), bias);
			if (num2 < 0f)
			{
				num3 = 0f - num3;
			}
		}
		else
		{
			num3 = num * angleOverHeight;
		}
		float num4 = Mathf.Cos((float)Math.PI / 180f * num3);
		float num5 = Mathf.Sin((float)Math.PI / 180f * num3);
		p.x = num4 * x + num5 * z;
		p.z = (0f - num5) * x + num4 * z;
		p = invtm.MultiplyPoint3x4(p);
		return p;
	}

	public override bool ModLateUpdate(MegaModContext mc)
	{
		return Prepare(mc);
	}

	public override bool Prepare(MegaModContext mc)
	{
		mat = Matrix4x4.identity;
		switch (axis)
		{
		case MegaAxis.X:
			MegaMatrix.RotateZ(ref mat, (float)Math.PI / 2f);
			break;
		case MegaAxis.Y:
			MegaMatrix.RotateX(ref mat, -(float)Math.PI / 2f);
			break;
		}
		SetAxis(mat);
		if (Bias != 0f)
		{
			bias = 1f - (Bias + 100f) / 200f;
			if (bias < 1E-05f)
			{
				bias = 1E-05f;
			}
			if (bias > 0.99999f)
			{
				bias = 0.99999f;
			}
			bias = Mathf.Log(bias) / Mathf.Log(0.5f);
			doBias = true;
		}
		else
		{
			bias = 1f;
			doBias = false;
		}
		if (from > to)
		{
			from = to;
		}
		if (to < from)
		{
			to = from;
		}
		CalcHeight(axis, angle, mc.bbox);
		return true;
	}

	public override void ExtraGizmo(MegaModContext mc)
	{
		if (doRegion)
		{
			DrawFromTo(axis, from, to, mc);
		}
	}
}