Adds a check that will run on login and other times to set the box size

Runs through the advancements that island has and corrects the size of
the box. This enables admins to adjust the value of advancements after
the fact and players will still benefit (or be nerfed) from the changes.

src/main/java/world/bentobox/boxed/AdvancementsManager.java

@@ -4,6 +4,7 @@ import java.io.File;
 import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.UUID;
 import java.util.concurrent.CompletableFuture;
 
 import org.bukkit.advancement.Advancement;
@@ -143,6 +144,20 @@ public class AdvancementsManager {
         return getIsland(island).getAdvancements().contains(advancement);
     }
 
+    /**
+     * Check and correct the island's protection size based on accumulated advancements
+     * @param island - island to check
+     * @return value of island size change. Negative values means the island range shrank.
+     */
+    public int checkIslandSize(Island island) {
+        int shouldSize = getIsland(island).getAdvancements().stream().mapToInt(this::getScore).sum();
+        int diff = shouldSize - island.getProtectionRange();
+        if (diff != 0) {
+            this.setProtectionSize(island, shouldSize, null);
+        }
+        return diff;
+    }
+
     /**
      * Add advancement to island and adjusts the island's protection size accordingly
      * @param p - player who just advanced
@@ -154,14 +169,7 @@ public class AdvancementsManager {
             // Wrong world
             return 0;
         }
-        String adv = "advancements." + advancement.getKey().toString();
-        // Check score of advancement
-        int score = 0;
-        if (!advConfig.contains(adv) && adv.endsWith("/root")) {
-            score = advConfig.getInt("settings.default-root-increase");
-        } else {
-            score = advConfig.getInt(adv, this.unknownAdvChange);
-        }
+        int score = getScore(advancement.getKey().toString());
         if (score == 0) {
             return 0;
         }
@@ -172,20 +180,31 @@ public class AdvancementsManager {
                 && addAdvancement(island, advancement.getKey().toString())) {
             int oldSize = island.getProtectionRange();
             int newSize = Math.max(1, oldSize + score);
-            island.setProtectionRange(newSize);
-            // Call Protection Range Change event. Does not support canceling.
-            IslandEvent.builder()
-            .island(island)
-            .location(island.getCenter())
-            .reason(IslandEvent.Reason.RANGE_CHANGE)
-            .involvedPlayer(p.getUniqueId())
-            .admin(true)
-            .protectionRange(newSize, island.getProtectionRange())
-            .build();
+            setProtectionSize(island, newSize, p.getUniqueId());
             return score;
         }
         return 0;
 
     }
 
+    private void setProtectionSize(@NonNull Island island, int newSize, @Nullable UUID uuid) {
+        island.setProtectionRange(newSize);
+        // Call Protection Range Change event. Does not support canceling.
+        IslandEvent.builder()
+        .island(island)
+        .location(island.getCenter())
+        .reason(IslandEvent.Reason.RANGE_CHANGE)
+        .involvedPlayer(uuid)
+        .admin(true)
+        .protectionRange(newSize, island.getProtectionRange())
+        .build();
+
+    }
+
+    private int getScore(String string) {
+        String adv = "advancements." + string;
+        // Check score of advancement
+        return !advConfig.contains(adv) && adv.endsWith("/root") ? advConfig.getInt("settings.default-root-increase") : advConfig.getInt(adv, this.unknownAdvChange);
+    }
+
 }

src/main/java/world/bentobox/boxed/listeners/AdvancementListener.java

@@ -116,6 +116,14 @@ public class AdvancementListener implements Listener {
         Island island = addon.getIslands().getIsland(addon.getOverWorld(), user);
         if (island != null) {
             grantAdv(user, addon.getAdvManager().getIsland(island).getAdvancements());
+            int diff = addon.getAdvManager().checkIslandSize(island);
+            if (diff > 0) {
+                user.sendMessage("boxed.size-changed", TextVariables.NUMBER, String.valueOf(diff));
+                user.getPlayer().playSound(user.getLocation(), Sound.ENTITY_PLAYER_LEVELUP, 1F, 2F);
+            } else if (diff < 0) {
+                user.sendMessage("boxed.size-decreased", TextVariables.NUMBER, String.valueOf(Math.abs(diff)));
+                user.getPlayer().playSound(user.getLocation(), Sound.ENTITY_VILLAGER_DEATH, 1F, 2F);
+            }
         }
     }
 

src/main/resources/locales/en-US.yml

@@ -4,6 +4,7 @@
 boxed:
   completed: '&a [name] completed!'
   size-changed: '&a Box size increased by [number]!'
+  size-decreased: '&c Box size decreased by [number]!'
   user-completed: '&a [name] completed [description]!'
   adv-disallowed: "&c You can only complete advancements in your own box. Revoking [description]."
   general: