TotalFreedomMod/commons/src/main/java/me/totalfreedom/totalfreedommod/fun/Trailer.java

package me.totalfreedom.totalfreedommod.fun;

import me.totalfreedom.totalfreedommod.FreedomService;
import me.totalfreedom.totalfreedommod.api.ShopItem;
import me.totalfreedom.totalfreedommod.util.ParticleDisplay;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.EventPriority;
import org.bukkit.event.player.PlayerMoveEvent;

import java.util.HashMap;
import java.util.Map;
import java.util.SplittableRandom;
import java.util.UUID;

public class Trailer extends FreedomService
{
    private final SplittableRandom random = new SplittableRandom();
    private final Map<UUID, ParticleDisplay> trailPlayers = new HashMap<>(); // player UUID and relative particle instance.

    @Override
    public void onStart()
    {
    }

    @Override
    public void onStop()
    {
    }

    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
    public void onPlayerMove(PlayerMoveEvent event)
    {
        if (plugin.sh == null) return; // Shop is disabled

        /* Doesn't continue any further if...
         * - The trail list is empty
         * - The player doesn't have their trail enabled in the first place
         * - The player doesn't have the trail item in the shop at all
         * - The player doesn't have permission to modify blocks in their current world
         */
        if (trailPlayers.isEmpty()
                || !trailPlayers.containsKey(event.getPlayer().getUniqueId())
                || !plugin.pl.getData(event.getPlayer()).hasItem(ShopItem.RAINBOW_TRAIL))
        {
            return;
        }

        final Player player = event.getPlayer();
        final ParticleDisplay particleDisplay = trailPlayers.get(player.getUniqueId());
        particleDisplay.spawnNext(player);
    }

    public void remove(Player player)
    {
        trailPlayers.remove(player.getUniqueId());
    }

    public void add(Player player)
    {
        if (trailPlayers.containsKey(player.getUniqueId())) return;

        trailPlayers.put(player.getUniqueId(), new ParticleDisplay());
    }

    public boolean contains(Player player)
    {
        return trailPlayers.containsKey(player.getUniqueId());
    }
}