V10Name

package de.V10lator.V10Name;

import java.util.HashMap;
import java.util.Map.Entry;

import net.minecraft.server.Entity;
import net.minecraft.server.EntityHuman;
import net.minecraft.server.EntityTracker;
import net.minecraft.server.MinecraftServer;
import net.minecraft.server.NetServerHandler;
import net.minecraft.server.Packet20NamedEntitySpawn;
import net.minecraft.server.Packet29DestroyEntity;
import net.minecraft.server.WorldServer;

import org.bukkit.ChatColor;
import org.bukkit.Location;
import org.bukkit.Server;
import org.bukkit.World;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.configuration.Configuration;
import org.bukkit.craftbukkit.CraftServer;
import org.bukkit.craftbukkit.CraftWorld;
import org.bukkit.craftbukkit.entity.CraftPlayer;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;

public class V10Name extends JavaPlugin
{
  final HashMap<String, String> changedNames = new HashMap<String, String>();

  public void onEnable()
  {
    Server s = getServer();
    MinecraftServer ms = ((CraftServer)s).getServer();
    WorldServer ws;
    for(World world: s.getWorlds())
    {
      ws = ((CraftWorld)world).getHandle();
      ws.tracker = new V10Tracker(ms, ws, this);
      for(Object o: ws.entityList)
        ws.tracker.track((Entity)o);
    }
    Configuration config = getConfig();
    Player p;
    for(String key: config.getKeys(false))
    {
      String newName = config.getString(key);
      changedNames.put(key, newName);
      p = s.getPlayerExact(key);
      if(p != null)
        changeName(p, p.getName(), newName);
    }
    s.getScheduler().scheduleSyncRepeatingTask(this, new Runnable(){public void run(){save();}}, 12000L, 12000L);
  }

  public void onDisable()
  {
    MinecraftServer ms = ((CraftServer)getServer()).getServer();
    WorldServer ws;
    for(World world: getServer().getWorlds())
    {
      ws = ((CraftWorld)world).getHandle();
      ws.tracker = new EntityTracker(ms, ws);
      for(Object o: ws.entityList)
        ws.tracker.track((Entity)o);
    }
    getServer().getScheduler().cancelTasks(this);
    save();
  }

  private void save()
  {
    Configuration config = getConfig();
    for(String key: config.getKeys(false))
      config.set(key, null);
    for(Entry<String, String> e: changedNames.entrySet())
      config.set(e.getKey(), e.getValue());
    saveConfig();
  }

  public boolean onCommand(CommandSender sender, Command command,
          String label, String[] args)
  {
    if(!(sender instanceof Player))
      return true;
    if(!sender.hasPermission("v10name.change"))
    {
      sender.sendMessage(ChatColor.RED+"You are not allowed to do that!");
      return true;
    }
    if(args.length < 1)
      return false;
    StringBuilder sb = new StringBuilder(args[0]);
    for(int i = 1; i < args.length; i++)
      sb.append(' ').append(args[i]);
    if(sb.length() > 16)
      sb.delete(16, sb.length());
    Player p = (Player)sender;
    String origName = p.getName();
    String newName = sb.toString().replace('&', '§').trim();

    if(origName.equals(newName))
    {
      if(changedNames.containsKey(origName))
      {
        String tmpName = changedNames.get(origName);
        changedNames.remove(origName);
        if(!origName.equals(tmpName))
          changeName(p, origName, newName);
      }
    }
    else
    {
      changedNames.put(origName, newName);
      changeName(p, origName, newName);
    }
    sender.sendMessage(ChatColor.GREEN+"Name changed!");
    return true;
  }

  private void changeName(Player p, String origName, String newName)
  {
    Location loc;
    Location myLoc = p.getLocation();
    double myX = myLoc.getX();
    double myZ = myLoc.getZ();
    String myWorld = myLoc.getWorld().getName();
    double d0;
    double d1;

    EntityHuman e = ((CraftPlayer)p).getHandle();

    Packet29DestroyEntity packet29 = new Packet29DestroyEntity(e.id);
    Packet20NamedEntitySpawn packet20 = new Packet20NamedEntitySpawn(e);
    packet20.b = newName;

    NetServerHandler ns;

    for(Player pl: getServer().getOnlinePlayers())
    {
      if(pl.getName().equals(origName))
        continue;
      loc = pl.getLocation();
      if(!myWorld.equals(loc.getWorld().getName()))
        continue;
      d0 = loc.getX() - (double) (myX / 32);
      d1 = loc.getZ() - (double) (myZ / 32);
      if(d0 >= -512.0D && d0 <= 512.0D && d1 >= -512.0D && d1 <= 512.0D)
      {
        ns = ((CraftPlayer)pl).getHandle().netServerHandler;
        ns.sendPacket(packet29);
        ns.sendPacket(packet20);
      }
    }
  }
}