Packet Scoreboard Team

package me.xenodev.ka.extras;

import net.minecraft.EnumChatFormat;
import net.minecraft.network.chat.ChatComponentText;
import net.minecraft.network.protocol.Packet;
import net.minecraft.network.protocol.game.PacketPlayOutScoreboardTeam;
import net.minecraft.world.scores.Scoreboard;
import net.minecraft.world.scores.ScoreboardTeam;
import org.bukkit.Bukkit;
import org.bukkit.craftbukkit.v1_17_R1.entity.CraftPlayer;
import org.bukkit.entity.Player;

import java.util.HashMap;
import java.util.UUID;

public class TeamManager {

    private static TeamManager instance;
    private Scoreboard scoreboard;
    private HashMap<UUID, String> teams;

    public TeamManager(){
        scoreboard = new Scoreboard();
        teams = new HashMap<>();
    }

    public void registerTeam(Player p, String prefix, EnumChatFormat color, String suffix, int level){
        String s = level + p.getUniqueId().toString().substring(1, 6);

        if(scoreboard.getTeam(s) != null){
            scoreboard.removeTeam(scoreboard.getTeam(s));
        }

        ScoreboardTeam team = scoreboard.createTeam(s);
        team.setColor(color);
        team.setPrefix(new ChatComponentText(prefix));
        team.setSuffix(new ChatComponentText(suffix));

        teams.put(p.getUniqueId(), s);
        update();
    }

    private void update() {
        for(Player all : Bukkit.getOnlinePlayers()){
            if(!scoreboard.getTeam(teams.get(all.getUniqueId())).getPlayerNameSet().contains(all.getName())){
                scoreboard.getTeam(teams.get(all.getUniqueId())).getPlayerNameSet().add(all.getName());
            }
            sendPacket(new PacketPlayOutScoreboardTeam(scoreboard.getTeam(teams.get(all.getUniqueId())), 1));
            sendPacket(new PacketPlayOutScoreboardTeam(scoreboard.getTeam(teams.get(all.getUniqueId())), 0));
        }
    }

    private void sendPacket(Packet<?> packet){
        for (Player onlinePlayer : Bukkit.getOnlinePlayers()) {
            CraftPlayer p = (CraftPlayer)onlinePlayer;
            p.getHandle().b.sendPacket(packet);
        }
    }

    public static TeamManager getInstance(){
        if(instance == null){
            instance = new TeamManager();
        }
        return instance;
    }


}