package gtPlusPlus.api.objects.minecraft;

import net.minecraft.entity.Entity;
import net.minecraft.util.AxisAlignedBB;
import net.minecraft.world.World;

import gtPlusPlus.core.util.minecraft.EntityUtils;

/**
 * Generates an AABB around an entity.
 * 
 * @author Alkalus
 *
 */
public class AABB {

    private final AxisAlignedBB mAabb;
    private final World mWorld;

    /**
     * Creates a AxisAlignedBB based around an Entity.
     * 
     * @param aEntity - The Entity to work with.
     * @param x       - Maximum X from origin.
     * @param y       - Maximum Y from origin.
     * @param z       - Maximum Z from origin.
     */
    public AABB(Entity aEntity, int x, int y, int z) {
        if (aEntity == null) {
            mAabb = null;
            mWorld = null;
        } else {
            mWorld = aEntity.worldObj;
            BlockPos aEntityLocation = EntityUtils.findBlockPosUnderEntity(aEntity);
            int xMin, xMax, yMin, yMax, zMin, zMax;
            xMin = aEntityLocation.xPos;
            yMin = aEntityLocation.yPos;
            zMin = aEntityLocation.zPos;
            xMax = aEntityLocation.xPos + x;
            yMax = aEntityLocation.yPos + y;
            zMax = aEntityLocation.zPos + z;
            mAabb = AxisAlignedBB.getBoundingBox(xMin, yMin, zMin, xMax, yMax, zMax);
        }
    }

    /**
     * Used to get the AxisAlignedBB from this class.
     * 
     * @return
     */
    public AxisAlignedBB get() {
        return mAabb;
    }

    /**
     * Used to determine if this object is valid or not.
     * 
     * @return
     */
    public boolean valid() {
        return mAabb != null && mWorld != null;
    }

    public World world() {
        return mWorld;
    }
}