package net.minecraft.client.venixpll.wings;

import net.minecraft.client.model.ModelBase;
import net.minecraft.client.model.ModelRenderer;

public class ModelWingBase
  extends ModelBase
{
  protected static float SCALE = 0.0625F;

  protected float getWingAngle(boolean isFlying, float maxAngle, int totalTime, int flyingTime, double d)
  {
    float angle = 0.0F;

    int flapTime = totalTime;
    if (isFlying) {
      flapTime = flyingTime;
    }
    float deltaTime = getAnimationTime(flapTime, d);
    if (deltaTime <= 0.5F) {
      angle = Sigmoid(-4.0F + deltaTime * 2.0F * 8.0F);
    } else {
      angle = 1.0F - Sigmoid(-4.0F + (deltaTime * 2.0F - 1.0F) * 8.0F);
    }
    angle *= maxAngle;

    return angle;
  }

  protected void setRotation(ModelRenderer model, float x, float y, float z)
  {
    model.rotateAngleX = x;
    model.rotateAngleY = y;
    model.rotateAngleZ = z;
  }

  private static float Sigmoid(double value)
  {
    return 1.0F / (1.0F + (float)Math.exp(-value));
  }

  private float getAnimationTime(int totalTime, double d)
  {
    float time = (float)((System.currentTimeMillis() + d) % totalTime);
    return time / totalTime;
  }
}