From c5526c86a2ffa25091ff5b0d9a82235314dc1a09 Mon Sep 17 00:00:00 2001
From: Ben Woo <30431861+benwoo1110@users.noreply.github.com>
Date: Mon, 9 Jun 2025 22:58:41 +0800
Subject: [PATCH] Implement multiverse plugin hook

---
 platforms/bukkit/common/build.gradle.kts      |  7 +++-
 .../dfsek/terra/bukkit/TerraBukkitPlugin.java |  2 +-
 .../hooks/MultiverseGeneratorPluginHook.java  | 42 +++++++++++++++++++
 .../bukkit/listeners/CommonListener.java      | 26 +++++++++++-
 4 files changed, 74 insertions(+), 3 deletions(-)
 create mode 100644 platforms/bukkit/common/src/main/java/com/dfsek/terra/bukkit/hooks/MultiverseGeneratorPluginHook.java

diff --git a/platforms/bukkit/common/build.gradle.kts b/platforms/bukkit/common/build.gradle.kts
index fb3b1cc8f..d6c87de8e 100644
--- a/platforms/bukkit/common/build.gradle.kts
+++ b/platforms/bukkit/common/build.gradle.kts
@@ -1,5 +1,8 @@
 repositories {
-
+    maven {
+        name = "onarandombox"
+        url = uri("https://repo.onarandombox.com/content/groups/public/")
+    }
 }
 
 dependencies {
@@ -7,6 +10,8 @@ dependencies {
 
     compileOnly("io.papermc.paper", "paper-api", Versions.Bukkit.paper)
 
+    compileOnly("org.mvplugins.multiverse.core", "multiverse-core", "5.0.0")
+
     shadedApi("io.papermc", "paperlib", Versions.Bukkit.paperLib)
 
     shadedApi("com.google.guava", "guava", Versions.Libraries.Internal.guava)
diff --git a/platforms/bukkit/common/src/main/java/com/dfsek/terra/bukkit/TerraBukkitPlugin.java b/platforms/bukkit/common/src/main/java/com/dfsek/terra/bukkit/TerraBukkitPlugin.java
index 1ebd8de52..1b33a4837 100644
--- a/platforms/bukkit/common/src/main/java/com/dfsek/terra/bukkit/TerraBukkitPlugin.java
+++ b/platforms/bukkit/common/src/main/java/com/dfsek/terra/bukkit/TerraBukkitPlugin.java
@@ -87,7 +87,7 @@ public class TerraBukkitPlugin extends JavaPlugin {
             return;
         }
 
-        Bukkit.getPluginManager().registerEvents(new CommonListener(), this); // Register master event listener
+        Bukkit.getPluginManager().registerEvents(new CommonListener(platform), this); // Register master event listener
         PaperUtil.checkPaper(this);
     }
 
diff --git a/platforms/bukkit/common/src/main/java/com/dfsek/terra/bukkit/hooks/MultiverseGeneratorPluginHook.java b/platforms/bukkit/common/src/main/java/com/dfsek/terra/bukkit/hooks/MultiverseGeneratorPluginHook.java
new file mode 100644
index 000000000..372e1162b
--- /dev/null
+++ b/platforms/bukkit/common/src/main/java/com/dfsek/terra/bukkit/hooks/MultiverseGeneratorPluginHook.java
@@ -0,0 +1,42 @@
+package com.dfsek.terra.bukkit.hooks;
+
+import com.dfsek.terra.api.Platform;
+import com.dfsek.terra.api.registry.key.Keyed;
+
+import org.mvplugins.multiverse.core.world.generators.GeneratorPlugin;
+import org.mvplugins.multiverse.external.jetbrains.annotations.NotNull;
+import org.mvplugins.multiverse.external.jetbrains.annotations.Nullable;
+
+import java.util.Collection;
+import java.util.List;
+
+public final class MultiverseGeneratorPluginHook implements GeneratorPlugin {
+
+    private final Platform platform;
+
+    public MultiverseGeneratorPluginHook(Platform platform) {
+        this.platform = platform;
+    }
+
+    @Override
+    public @NotNull Collection<String> suggestIds(@Nullable String s) {
+        return platform.getConfigRegistry().entries().stream()
+            .map(Keyed::getID)
+            .toList();
+    }
+
+    @Override
+    public @Nullable Collection<String> getExampleUsages() {
+        return List.of("/mv create example_world NORMAL -g Terra:OVERWORLD");
+    }
+
+    @Override
+    public @Nullable String getInfoLink() {
+        return "https://terra.polydev.org/";
+    }
+
+    @Override
+    public @NotNull String getPluginName() {
+        return "Terra";
+    }
+}
diff --git a/platforms/bukkit/common/src/main/java/com/dfsek/terra/bukkit/listeners/CommonListener.java b/platforms/bukkit/common/src/main/java/com/dfsek/terra/bukkit/listeners/CommonListener.java
index 84d836fd7..ede5c9e98 100644
--- a/platforms/bukkit/common/src/main/java/com/dfsek/terra/bukkit/listeners/CommonListener.java
+++ b/platforms/bukkit/common/src/main/java/com/dfsek/terra/bukkit/listeners/CommonListener.java
@@ -17,13 +17,37 @@
 
 package com.dfsek.terra.bukkit.listeners;
 
+import com.dfsek.terra.api.Platform;
+import com.dfsek.terra.bukkit.hooks.MultiverseGeneratorPluginHook;
+
+import org.bukkit.event.EventHandler;
 import org.bukkit.event.Listener;
+import org.bukkit.event.server.PluginEnableEvent;
+import org.mvplugins.multiverse.core.MultiverseCoreApi;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 
 /**
  * Listener for events on all implementations.
  */
 public class CommonListener implements Listener {
-    public CommonListener() {
+    private static final Logger logger = LoggerFactory.getLogger(CommonListener.class);
+    private final Platform platform;
+
+    public CommonListener(Platform platform) {
+        this.platform = platform;
+    }
+
+    @EventHandler
+    public void onPluginEnable(PluginEnableEvent e) {
+        if(e.getPlugin().getName().equals("Multiverse-Core")) {
+            try {
+                MultiverseCoreApi.get().getGeneratorProvider()
+                    .registerGeneratorPlugin(new MultiverseGeneratorPluginHook(platform));
+            } catch(Exception ex) {
+                logger.error("Failed to register Terra generator plugin to multiverse.", ex);
+            }
+        }
     }
 }