Need help with mana regeneration

Ok, so I'm creating a plugin that uses mana to cast skills, but I'm having issues with mana regeneration. Here's my class for the timed event

Code:java

package jjbat_000.legendaryrealms;
 
import java.util.HashMap;
import java.util.UUID;
 
import jjbat_000.legendaryrealms.spells.FireballSpell;
import jjbat_000.legendaryrealms.spells.Heal;
import jjbat_000.legendaryrealms.spells.LightningBolt;
import jjbat_000.legendaryrealms.spells.Teleport;
 
import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.scheduler.BukkitRunnable;
import org.bukkit.entity.Player;
import org.bukkit.event.Listener;
import org.bukkit.Bukkit;
 
public class Core extends JavaPlugin implements Listener {
    public HashMap<UUID, LRPlayer> lrPlayer = new HashMap<>();
 
    public LRPlayer getLRPlayer(UUID uuid) {
        return lrPlayer.get(uuid);
    }
 
    public void onEnable() {
        saveDefaultConfig();
        Bukkit.getServer().getPluginManager()
                .registerEvents(new PlayerListener(this), this);
        Bukkit.getServer().getPluginManager()
                .registerEvents(new FireballSpell(this), this);
        Bukkit.getServer().getPluginManager()
                .registerEvents(new LightningBolt(this), this);
        Bukkit.getServer().getPluginManager()
                .registerEvents(new Heal(this), this);
        Bukkit.getServer().getPluginManager()
                .registerEvents(new Teleport(this), this);
        new BukkitRunnable() {
            public void run() {
                for (Player player : Bukkit.getOnlinePlayers()) {
                    LRPlayer lrPlayer = getLRPlayer(player.getUniqueId());
                    if (lrPlayer.getMana() != getConfig().getInt("Max-Mana")) {
                        lrPlayer.addMana(getConfig().getInt("Mana-To-Add"));
                    }
 
                }
            }
        }.runTaskTimer(this, 20, getConfig().getInt("Mana-Delay"));
    }
 
    public void onDisable() {
        saveConfig();
 
 
    }
 
    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label,
            String[] args) {
        if (cmd.getName().equalsIgnoreCase("lreload")) {
            if (sender.hasPermission("legendaryrealms.reload")) {
                saveConfig();
                reloadConfig();
                sender.sendMessage(ChatColor.GREEN
                        + "Successfully reloaded configuration file");
            } else {
                sender.sendMessage(ChatColor.RED
                        + "You do not have permission to use this command!");
            }
 
            return true;
        }
 
        return false;
 
    }
}

and here's the class with the mana methods.

Code:java

package jjbat_000.legendaryrealms;
 
import org.bukkit.event.Listener;
import org.bukkit.entity.Player;
 
import jjbat_000.legendaryrealms.Core;
import jjbat_000.legendaryrealms.LRPlayer;
 
public class LRPlayer implements Listener {
 
    private final Core core;
    private Player player;
    private int mana;
    private int MaxMana;
 
    public LRPlayer(Core core, Player player) {
        this.core = core;
        this.player = player;
    }
 
    public void setFoodLevel(int amount) {
        player.setFoodLevel(core.getConfig().getInt("Max-Mana"));
    }
 
    public Player getPlayer() {
        return this.player;
    }
 
    public int getMana() {
        return mana;
    }
 
    public int getMaxMana() {
        MaxMana = core.getConfig().getInt("Max-Mana");
        return MaxMana;
    }
 
    public int setMana(int mana) {
        if (getMana() != MaxMana) {
            this.mana = mana;
            return mana;
        }
        return -1;
 
    }
 
    public int addMana(int amount) {
        if (getMana() != core.getConfig().getInt("Max-Mana")) {
            setMana(this.mana + amount);
            player.setFoodLevel(getMana());
            return mana;
        }
        return -1;
 
    }
 
    public int removeMana(int amount) {
        if (getMana() <= 0) {
            setMana(this.mana - amount);
            player.setFoodLevel(getMana());
            return mana;
        }
 
        return -1;
    }
 
}

 

In your addMana() method you should check if current mana + amount <= maxMana
To make sure you do not exceed the max mana level.

In your removeMana() method, you should check if current mana - amount >= 0 to make sure you do not go negative.

If you have further problems, you should explain them to us in detail.