Speed v.1.1

package com.rotor.speed;

import org.bukkit.Bukkit;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerMoveEvent;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.potion.PotionEffect;
import org.bukkit.potion.PotionEffectType;

public class Main extends JavaPlugin implements Listener {

    int speed = 0;

    @Override
    public void onEnable() {
        System.out.println("Speed is enabled");

        this.getConfig().options().copyDefaults();
        saveDefaultConfig();

        Bukkit.getPluginManager().registerEvents(this,  this);
    }

    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {

        if (cmd.getName().equals("speed")) {
            Player player = (Player) sender;
            if(player.hasPermission("speed.speed")) {
                if (speed == 1) {
                    if (sender instanceof Player) {
                        String speedDisabled = this.getConfig().getString("speedDisabled");
                        player.sendMessage(speedDisabled);
                        speed = 0;
                    }
                } else {
                    if (sender instanceof Player) {
                        String speedEnabled = this.getConfig().getString("speedEnabled");
                        player.sendMessage(speedEnabled);
                        speed = 1;
                    }
                }
            } else {
                String noPermission = this.getConfig().getString("noPermission");
                player.sendMessage(noPermission);
            }
        }
        return false;
    }

    @EventHandler
    public void onMove(PlayerMoveEvent e) {
        if (speed == 1) {
            Player player = e.getPlayer();
            int x = this.getConfig().getInt("speedMultiplier");
            player.addPotionEffect(new PotionEffect(PotionEffectType.SPEED, 1, x - 1));
        }
    }
}