using System;
using UnityEngine;

[AddComponentMenu("Modifiers/Tree Bend")]
public class MegaTreeBend : MegaModifier
{
	public float fBendScale = 1f;

	public Vector3 vWind = Vector3.zero;

	public float WindDir;

	public float WindSpeed;

	private Vector2 waveIn = Vector2.zero;

	private Vector2 waves = Vector2.zero;

	public override string ModName()
	{
		return "Tree Bend";
	}

	public override string GetHelpURL()
	{
		return "?page_id=41";
	}

	private float frac(float val)
	{
		int num = (int)val;
		return val - (float)num;
	}

	private Vector2 smoothCurve(Vector2 x)
	{
		x.x = x.x * x.x * (3f - 2f * x.x);
		x.y = x.y * x.y * (3f - 2f * x.y);
		return x;
	}

	private Vector2 triangleWave(Vector2 x)
	{
		x.x = Mathf.Abs(frac(x.x + 0.5f) * 2f - 1f);
		x.y = Mathf.Abs(frac(x.y + 0.5f) * 2f - 1f);
		return x;
	}

	private Vector2 smoothTriangleWave(Vector2 x)
	{
		return smoothCurve(triangleWave(x));
	}

	private float windTurbulence(float bbPhase, float frequency, float strength)
	{
		waveIn.x = bbPhase + frequency;
		waveIn.y = bbPhase + frequency;
		waves.x = frac(waveIn.x * 1.975f) * 2f - 1f;
		waves.y = frac(waveIn.y * 0.793f) * 2f - 1f;
		waves = smoothTriangleWave(waves);
		return (waves.x + waves.y) * strength;
	}

	private Vector2 windEffect(float bbPhase, Vector2 windDirection, float gustLength, float gustFrequency, float gustStrength, float turbFrequency, float turbStrength)
	{
		float num = windTurbulence(bbPhase, turbFrequency, turbStrength);
		float num2 = Mathf.Clamp01(Mathf.Sin((bbPhase - gustFrequency) / gustLength));
		float num3 = num2 * gustStrength + (0.2f + num2) * num;
		return num3 * windDirection;
	}

	public override void SetValues(MegaModifier mod)
	{
	}

	public override Vector3 Map(int i, Vector3 p)
	{
		p = tm.MultiplyPoint3x4(p);
		float magnitude = p.magnitude;
		float num = p.y * fBendScale;
		num += 1f;
		num *= num;
		num = num * num - num;
		Vector3 vector = p;
		vector.x += vWind.x * num;
		vector.z += vWind.y * num;
		p = vector.normalized * magnitude;
		p = invtm.MultiplyPoint3x4(p);
		return p;
	}

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

	public override bool Prepare(MegaModContext mc)
	{
		vWind.x = Mathf.Sin(WindDir * ((float)Math.PI / 180f)) * WindSpeed;
		vWind.y = Mathf.Cos(WindDir * ((float)Math.PI / 180f)) * WindSpeed;
		return true;
	}
}