package net.minecraft.entity;

import net.minecraft.block.state.IBlockState;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.math.MathHelper;
import net.minecraft.world.World;

public abstract class EntityFlying extends EntityLiving
{
    public EntityFlying(World worldIn)
    {
        super(worldIn);
    }

    public void fall(float distance, float damageMultiplier)
    {
    }

    protected void updateFallState(double y, boolean onGroundIn, IBlockState state, BlockPos pos)
    {
    }

    public void travel(float strafe, float vertical, float forward)
    {
        if (this.isInWater())
        {
            this.moveRelative(strafe, vertical, forward, 0.02F);
            this.move(MoverType.SELF, this.motionX, this.motionY, this.motionZ);
            this.motionX *= 0.800000011920929D;
            this.motionY *= 0.800000011920929D;
            this.motionZ *= 0.800000011920929D;
        }
        else if (this.isInLava())
        {
            this.moveRelative(strafe, vertical, forward, 0.02F);
            this.move(MoverType.SELF, this.motionX, this.motionY, this.motionZ);
            this.motionX *= 0.5D;
            this.motionY *= 0.5D;
            this.motionZ *= 0.5D;
        }
        else
        {
            float f = 0.91F;

            if (this.onGround)
            {
                BlockPos underPos = new BlockPos(MathHelper.floor(this.posX), MathHelper.floor(this.getEntityBoundingBox().minY) - 1, MathHelper.floor(this.posZ));
                IBlockState underState = this.world.getBlockState(underPos);
                f = underState.getBlock().getSlipperiness(underState, this.world, underPos, this) * 0.91F;
            }

            float f1 = 0.16277136F / (f * f * f);
            this.moveRelative(strafe, vertical, forward, this.onGround ? 0.1F * f1 : 0.02F);
            f = 0.91F;

            if (this.onGround)
            {
                BlockPos underPos = new BlockPos(MathHelper.floor(this.posX), MathHelper.floor(this.getEntityBoundingBox().minY) - 1, MathHelper.floor(this.posZ));
                IBlockState underState = this.world.getBlockState(underPos);
                f = underState.getBlock().getSlipperiness(underState, this.world, underPos, this) * 0.91F;
            }

            this.move(MoverType.SELF, this.motionX, this.motionY, this.motionZ);
            this.motionX *= (double)f;
            this.motionY *= (double)f;
            this.motionZ *= (double)f;
        }

        this.prevLimbSwingAmount = this.limbSwingAmount;
        double d1 = this.posX - this.prevPosX;
        double d0 = this.posZ - this.prevPosZ;
        float f2 = MathHelper.sqrt(d1 * d1 + d0 * d0) * 4.0F;

        if (f2 > 1.0F)
        {
            f2 = 1.0F;
        }

        this.limbSwingAmount += (f2 - this.limbSwingAmount) * 0.4F;
        this.limbSwing += this.limbSwingAmount;
    }

    /**
     * Returns true if this entity should move as if it were on a ladder (either because it's actually on a ladder, or
     * for AI reasons)
     */
    public boolean isOnLadder()
    {
        return false;
    }
}