add changeworld listener (#16)

* add changeworld listener

* simplify logic, add notification for run exit on death
remove portals from canceling run, ensure gamemode is only changed in certain teleport events

make it more explicit that IslandEnterEvent checks source world before changing gamemode

non-parkour -> parkour: PlayerChangedWorldEvent set gm
non-parkour -> non-parkour: none
parkour -> parkour:
        same island: PlayerTeleportEvent set gm if not running
        between islands: IslandEnterEvent set gm
parkour -> non-parkour: none

---------

Co-authored-by: tastybento <tastybento@users.noreply.github.com>

src/main/java/world/bentobox/parkour/listeners/CourseRunnerListener.java

@@ -17,6 +17,7 @@
 import org.bukkit.event.entity.EntityDamageEvent;
 import org.bukkit.event.entity.EntityDamageEvent.DamageCause;
 import org.bukkit.event.entity.PlayerDeathEvent;
+import org.bukkit.event.player.PlayerChangedWorldEvent;
 import org.bukkit.event.player.PlayerCommandPreprocessEvent;
 import org.bukkit.event.player.PlayerInteractEvent;
 import org.bukkit.event.player.PlayerQuitEvent;
@@ -73,10 +74,40 @@ public void onVisitorArrive(IslandEnterEvent e) {
         } else if (!parkourRunManager.timers().containsKey(e.getPlayerUUID())) {
             user.notify("parkour.to-start");
         }
-        if (island.getFlag(addon.PARKOUR_CREATIVE) <= island.getRank(user)) {
-            user.setGameMode(GameMode.CREATIVE);
-        } else {
-            user.setGameMode(GameMode.SURVIVAL);
+
+        // the location that the player teleports from
+        Location fromLocation = user.getLocation();
+
+        if (addon.inWorld(fromLocation)) {
+            // if the player is staying in a parkour managed world they can have their gamemode changed
+            // this occurs when their island changes, so wont risk affecting players that are currently running
+            // since exit would trigger first
+            // cross (unmanaged) world teleportation is handled in onPlayerChangeWorld
+
+            if (island.getFlag(addon.PARKOUR_CREATIVE) <= island.getRank(user)) {
+                user.setGameMode(GameMode.CREATIVE);
+            } else {
+                user.setGameMode(GameMode.SURVIVAL);
+            }
+        }
+    }
+
+    @EventHandler
+    public void onPlayerChangeWorld(PlayerChangedWorldEvent event) {
+        User user = User.getInstance(event.getPlayer());
+        Location currentLocation = user.getLocation();
+        boolean fromParkour = addon.inWorld(event.getFrom());
+        boolean toParkour = addon.inWorld(currentLocation);
+
+        if (toParkour && !fromParkour) {
+            // switching from non-parkour world to parkour world
+            addon.getIslandsManager().getIslandAt(currentLocation).ifPresent(island -> {
+                if (island.getFlag(addon.PARKOUR_CREATIVE) <= island.getRank(user)) {
+                    user.setGameMode(GameMode.CREATIVE);
+                } else {
+                    user.setGameMode(GameMode.SURVIVAL);
+                }
+            });
         }
     }
 
@@ -93,6 +124,10 @@ public void onVisitorLeave(IslandExitEvent e) {
     @EventHandler(priority = EventPriority.NORMAL)
     public void onPlayerDeath(PlayerDeathEvent e) {
         // Game over
+        User user = User.getInstance(e.getEntity().getUniqueId());
+        if (parkourRunManager.checkpoints().containsKey(e.getEntity().getUniqueId()) && user.isOnline()) {
+            user.notify("parkour.session-ended");
+        }
         parkourRunManager.clear(e.getEntity().getUniqueId());
     }
 
@@ -125,8 +160,8 @@ public void onVisitorFall(EntityDamageEvent e) {
     @EventHandler
     public void onTeleport(PlayerTeleportEvent e) {
         boolean shouldStopRun = switch (e.getCause()) {
-            case ENDER_PEARL, CHORUS_FRUIT, DISMOUNT, EXIT_BED -> false;
-            case COMMAND, PLUGIN, NETHER_PORTAL, END_PORTAL, SPECTATE, END_GATEWAY, UNKNOWN -> true;
+        case ENDER_PEARL, CHORUS_FRUIT, DISMOUNT, EXIT_BED, NETHER_PORTAL, END_PORTAL -> false;
+        case COMMAND, PLUGIN, SPECTATE, END_GATEWAY, UNKNOWN -> true;
         };
         UUID playerUUID = e.getPlayer().getUniqueId();
         if (!parkourRunManager.currentlyTeleporting().contains(playerUUID) && shouldStopRun && parkourRunManager.timers().containsKey(playerUUID)) {
@@ -146,7 +181,11 @@ public void onTeleport(PlayerTeleportEvent e) {
         Optional<Island> fromIsland = addon.getIslands().getIslandAt(e.getFrom());
         Optional<Island> toIsland = addon.getIslands().getIslandAt(e.getTo());
 
-        if (fromIsland.isPresent() && toIsland.isPresent() && fromIsland.get().equals(toIsland.get())) {
+        boolean shouldAlterGamemode = switch (e.getCause()) {
+            case COMMAND, PLUGIN, UNKNOWN -> true;
+            default -> false;
+        };
+        if (shouldAlterGamemode && fromIsland.isPresent() && toIsland.isPresent() && fromIsland.get().equals(toIsland.get())) {
             // same island teleport
             Island island = fromIsland.get();
             User user = User.getInstance(e.getPlayer());