add option for totems to save players from void death

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>me.youhavetrouble</groupId>
     <artifactId>PurpurExtras</artifactId>
-    <version>1.13.1</version>
+    <version>1.14.0</version>
     <packaging>jar</packaging>
 
     <name>PurpurExtras</name>

src/main/java/me/youhavetrouble/purpurextras/config/PurpurConfig.java

@@ -83,6 +83,8 @@ public PurpurConfig() {
         enableFeature(FurnaceBurnTimeListener.class, getBoolean("settings.furnace.burn-time.enabled", false));
         this.furnaceBurnTimeMultiplier = getDouble("settings.furnace.burn-time.multiplier", 1.0);
 
+        enableFeature(VoidTotemListener.class, getBoolean("settings.totem.work-on-void-death", false));
+
         saveConfig();
     }
 

src/main/java/me/youhavetrouble/purpurextras/listeners/VoidTotemListener.java

@@ -0,0 +1,78 @@
+package me.youhavetrouble.purpurextras.listeners;
+
+import org.bukkit.EntityEffect;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.player.PlayerMoveEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.potion.PotionEffect;
+import org.bukkit.potion.PotionEffectType;
+
+import java.util.*;
+
+public class VoidTotemListener implements Listener {
+
+    private final Collection<PotionEffect> totemEffects = new ArrayList<>();
+    private final HashMap<UUID, Location> lastGroundedLocations = new HashMap<>();
+
+    public VoidTotemListener() {
+        totemEffects.add(new PotionEffect(PotionEffectType.REGENERATION, 20*45, 1));
+        totemEffects.add(new PotionEffect(PotionEffectType.FIRE_RESISTANCE, 20*40, 0));
+        totemEffects.add(new PotionEffect(PotionEffectType.ABSORPTION, 20*5, 1));
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void onPlayerMove(PlayerMoveEvent event) {
+        if (!event.hasChangedPosition()) return;
+        Location location = event.getTo().clone();
+        if (location.subtract(0, 0.05, 0).getBlock().getType().isAir()) return;
+        lastGroundedLocations.put(event.getPlayer().getUniqueId(), event.getTo().toCenterLocation());
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void onPlayerQuit(PlayerQuitEvent event) {
+        lastGroundedLocations.remove(event.getPlayer().getUniqueId());
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void onPlayerDeathInVoid(EntityDamageEvent event) {
+        if (!(event.getEntity() instanceof Player player)) return;
+        if (!event.getCause().equals(EntityDamageEvent.DamageCause.VOID)) return;
+        Location location = player.getLocation();
+        if (location.getY() > location.getWorld().getMinHeight()) return;
+
+        if (player.getHealth() - event.getFinalDamage() > 0) return;
+
+        if (!player.getInventory().getItemInMainHand().getType().equals(Material.TOTEM_OF_UNDYING)
+                && !player.getInventory().getItemInOffHand().getType().equals(Material.TOTEM_OF_UNDYING)
+        ) return;
+
+        event.setCancelled(true);
+
+        Location safeLocation = lastGroundedLocations.getOrDefault(player.getUniqueId(), location.getWorld().getSpawnLocation());
+        player.teleportAsync(safeLocation).thenRun(() -> useTotem(player));
+    }
+
+    private void useTotem(Player player) {
+        ItemStack totem = null;
+        if (player.getInventory().getItemInMainHand().getType().equals(Material.TOTEM_OF_UNDYING)) {
+            totem = player.getInventory().getItemInMainHand();
+        } else if (player.getInventory().getItemInOffHand().getType().equals(Material.TOTEM_OF_UNDYING)) {
+            totem = player.getInventory().getItemInOffHand();
+        }
+        if (totem == null) return;
+        totem.subtract();
+        player.setFallDistance(0);
+        player.setHealth(1);
+        player.playEffect(EntityEffect.TOTEM_RESURRECT);
+        player.getActivePotionEffects().forEach(potionEffect -> player.removePotionEffect(potionEffect.getType()));
+        player.addPotionEffects(this.totemEffects);
+    }
+
+}