Minecraft mod part 2

package com.manusoftar.minefinder.serverproxy;

import java.awt.Point;
import java.util.List;
import java.util.Random;
import java.util.Stack;

import net.minecraft.client.Minecraft;
import net.minecraft.client.entity.EntityPlayerSP;
import net.minecraft.command.CommandBase;
import net.minecraft.command.CommandException;
import net.minecraft.command.ICommand;
import net.minecraft.command.ICommandSender;
import net.minecraft.util.BlockPos;
import net.minecraft.util.ChatComponentText;

public class MineFinderCommand implements ICommand {

private static boolean hasMineshaftStartingPoint(long mapSeed, int chunkX, int chunkZ){

        Random rand = new Random();

        // *** MapGenBase->generate() / MapGenStructure->getNeareastInstance()
        rand.setSeed(mapSeed);
        long seedMod1 = rand.nextLong();
        long seedMod2 = rand.nextLong();

        long seedMod3 = (long)chunkX * seedMod1;
        long seedMod4 = (long)chunkZ * seedMod2;

        rand.setSeed(seedMod3 ^ seedMod4 ^ mapSeed);

        rand.nextInt();

        // *** MapGenMineshaft->canSpawnStructureAtCoords
        if(rand.nextDouble() < 0.01D && rand.nextInt(80) < Math.max(Math.abs(chunkX), Math.abs(chunkZ))){
            return true;
        }

        return false;
    }


    @Override
    public int compareTo(Object o) {
        // TODO Auto-generated method stub
        return 0;
    }


    @Override
    public String getName() {
        // TODO Auto-generated method stub
        return "findMine";
    }


    @Override
    public String getCommandUsage(ICommandSender sender) {
        // TODO Auto-generated method stub
        return "findMine radius";
    }


    @Override
    public List getAliases() {
        // TODO Auto-generated method stub
        return null;
    }


    @Override
    public void execute(ICommandSender sender, String[] args) throws CommandException {
        // TODO Auto-generated method stub
        // El comando es /findMine o /findMine

        int range = 150;
          if (args.length>0){
               try {
                   range = Integer.parseInt(args[0]);

                   EntityPlayerSP p1 = Minecraft.getMinecraft().thePlayer;
                   int chunkx, chunkz;
                   chunkx = p1.chunkCoordX;
                   chunkz = p1.chunkCoordZ;

                   Stack<Point> chunks = new Stack<Point>();

                   //Semilla de creación del mundo actual
                   long seed = sender.getEntityWorld().getSeed();

                   for (int offx = 0; offx<range; offx++){
                       for (int offz = 0; offz<range; offz++){
                            if (hasMineshaftStartingPoint(seed, chunkx+offx, chunkz+offz)){
                                chunks.push(new Point(chunkx+offx,chunkz+offz));
                            }
                            if (hasMineshaftStartingPoint(seed, chunkx+offx, chunkz-offz)){
                                chunks.push(new Point(chunkx+offx,chunkz-offz));
                            }
                            if (hasMineshaftStartingPoint(seed, chunkx-offx, chunkz+offz)){
                                chunks.push(new Point(chunkx-offx,chunkz+offz));
                            }
                            if (hasMineshaftStartingPoint(seed, chunkx-offx, chunkz-offz)){
                                chunks.push(new Point(chunkx-offx,chunkz-offz));
                            }
                       }
                   }

                   int distance=99999999;
                   int min = -1;
                   for ( int n = 0; n<chunks.size(); n++ ) {
                       Point chunk = chunks.get(n);
                       int dis = (int)(Math.sqrt(Math.pow(chunkx-chunk.x, 2)+Math.pow(chunkz-chunk.y,2)));
                       if (dis < distance) {
                           distance = dis;
                           min = n;
                       }
                   }




                   sender.addChatMessage(new ChatComponentText("Mina encontrada: " + chunks.get(min).toString()));


               } catch(Exception ex){

               }
           }


    }


    @Override
    public boolean canCommandSenderUse(ICommandSender sender) {
        // TODO Auto-generated method stub
        return false;
    }


    @Override
    public List addTabCompletionOptions(ICommandSender sender, String[] args, BlockPos pos) {
        // TODO Auto-generated method stub
        return null;
    }


    @Override
    public boolean isUsernameIndex(String[] args, int index) {
        // TODO Auto-generated method stub
        return false;
    }
}