package net.minecraftforge.common.util;

import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.world.ChunkCoordIntPair;

// Sorter to load nearby chunks first
public class ChunkCoordComparator implements java.util.Comparator<ChunkCoordIntPair>
{
	private int x;
	private int z;

	public ChunkCoordComparator(EntityPlayerMP entityplayer)
	{
		x = (int) entityplayer.posX >> 4;
		z = (int) entityplayer.posZ >> 4;
	}

	public int compare(ChunkCoordIntPair a, ChunkCoordIntPair b)
	{
		if (a.equals(b))
		{
			return 0;
		}

		// Subtract current position to set center point
		int ax = a.chunkXPos - this.x;
		int az = a.chunkZPos - this.z;
		int bx = b.chunkXPos - this.x;
		int bz = b.chunkZPos - this.z;
		int result = ((ax - bx) * (ax + bx)) + ((az - bz) * (az + bz));

		if (result != 0)
		{
			return result;
		}

		if (ax < 0)
		{
			if (bx < 0)
			{
				return bz - az;
			}
			else
			{
				return -1;
			}
		}
		else
		{
			if (bx < 0)
			{
				return 1;
			}
			else
			{
				return az - bz;
			}
		}
	}
}