ItemEffects/src/main/java/com/zivilon/itemeffects/AuraManager.java

package com.zivilon.itemeffects;

import org.bukkit.Bukkit;
import org.bukkit.World;
import org.bukkit.entity.Player;
import org.bukkit.scheduler.BukkitTask;
import org.bukkit.potion.PotionEffect;
import org.bukkit.potion.PotionEffectType;

import java.util.Map;
import java.util.HashMap;
import java.util.UUID;
import java.util.ArrayList;
import java.util.List;
import java.util.Collections;
import java.util.stream.Collectors;

import com.zivilon.itemeffects.ItemEffects;

public class AuraManager {
    
    private final ItemEffects plugin;
    private final Map<UUID, PlayerAuraTask> runningAuras = new HashMap<>();
    private Map<UUID, List<PotionEffect>> originalEffects = new HashMap<>();


    public AuraManager(ItemEffects plugin) {
        this.plugin = plugin;
    }

    // Please don't break, this thing was a hell to set up and I don't want to ever look at it again

    public void startAuraTask(Aura aura) {
        // Cancel the old task if it exists
        BukkitTask oldTask = null;
        if (runningAuras.containsKey(aura.getOwner().getUniqueId())) {
            oldTask = runningAuras.get(aura.getOwner().getUniqueId()).getTask();
        }
        if (oldTask != null) {
            oldTask.cancel();
        }

        // Start a new repeating task
        BukkitTask newTask = Bukkit.getScheduler().runTaskTimer(plugin, () -> {
        World world = aura.getOwner().getWorld();

        for (Aura.AuraEffectSet effectSet : aura.getEffectSets()) {
            for (Player nearbyPlayer : world.getPlayers()) {
                if (nearbyPlayer.equals(aura.getOwner())) continue; // Skip the aura owner

                double distance = nearbyPlayer.getLocation().distance(aura.getOwner().getLocation());
                // Check player distance within the task
                if (distance <= effectSet.getRadius()) {

                    // 1. If player already has an effect of the same type and it's not ambient
                    if (nearbyPlayer.hasPotionEffect(effectSet.getEffect().getType()) && !getPotionEffectOfType(nearbyPlayer, effectSet.getEffect().getType()).isAmbient()) {
                        originalEffects.put(nearbyPlayer.getUniqueId(), new ArrayList<>(Collections.singletonList(getPotionEffectOfType(nearbyPlayer, effectSet.getEffect().getType()))));
                    }

                    // 2. Remove any existing conflicting effects
                    nearbyPlayer.removePotionEffect(effectSet.getEffect().getType());

                    // 3. Apply the aura effect
                    nearbyPlayer.addPotionEffect(effectSet.getEffect());

                }
            }
        }
    }, 0L, 40L); // Run every 2 seconds (40 ticks)

    // Store the new task in our map
    runningAuras.put(aura.getOwner().getUniqueId(), new PlayerAuraTask(aura, newTask));
}
    private PotionEffect getPotionEffectOfType(Player player, PotionEffectType type) {
        for (PotionEffect effect : player.getActivePotionEffects()) {
            if (effect.getType().equals(type)) {
                return effect;
            }
        }
        return null;
    }

    public void stopAuraTask(Player player) {
        PlayerAuraTask auraTask = runningAuras.remove(player.getUniqueId());

        if (auraTask == null) {
            return;
        }
        
        BukkitTask task = auraTask.getTask();
        if (task != null) {
            task.cancel();
        }

        // Immediately restore original effects to the aura owner
        if (originalEffects.containsKey(player.getUniqueId())) {
            List<PotionEffect> storedEffects = originalEffects.remove(player.getUniqueId());
            for (PotionEffect effect : storedEffects) {
                player.addPotionEffect(effect, true);
            }
        }

        // Restore effects to all players affected by this aura
        restoreEffectsOnAuraEnd(auraTask.getAura());
    }
    public void restoreEffectsOnAuraEnd(Aura aura) {
        // Iterate over all players in the aura's world
        for (Player player : aura.getOwner().getWorld().getPlayers()) {

            // Check if we stored any original effects for the player
            if (originalEffects.containsKey(player.getUniqueId())) {
                
                List<PotionEffect> storedEffects = originalEffects.get(player.getUniqueId()); // Just get the effects without removing them

                if(storedEffects != null) {
                    // Iterate over each of the effect sets in the aura
                    for (Aura.AuraEffectSet effectSet : aura.getEffectSets()) {

                        for (PotionEffect effect : storedEffects) {
                            player.removePotionEffect(effect.getType()); // Remove the current effect
                            player.addPotionEffect(effect, true); // Apply the stored effect
                        }
                    }
                    originalEffects.remove(player.getUniqueId()); // Now remove it after processing all effect sets
                }
            }
        }
    }

}