game timer

package skywars.notjacob.runnables;

import org.bukkit.scheduler.BukkitRunnable;

import skywars.notjacob.main.SkyWars;

public class GameTimerR {
    private SkyWars plugin;
    public void timer() {
        new BukkitRunnable() {
            int timer = 10 * 60 * 20;
            //12,000 total || 0  game end || 2400 dragons || 4800 refill || 7200 refill || 9600 refill || 12000 game start
            @Override
            public void run() {
                if (timer > 9600) {
                    timer--;
                } else if (timer == 9600){
                    //refill
                    timer--;
                } else if (timer > 7200) {
                    timer--;
                } else if (timer == 7200) {
                    //refill
                    timer--;
                } else if (timer > 4800) {
                    timer--;
                } else if (timer == 4800) {
                    //refill
                    timer--;
                } else if (timer > 2400) {
                    //dragons
                    timer--;
                } else if (timer > 0) {
                    timer--;
                } else {
                    cancel();
                    //end
                }
            }
        }.runTaskTimerAsynchronously(plugin, 0L, 20L);
    }
}