Implemented Issue #9

src/main/java/com/magmaguy/resourcepackmanager/config/DefaultConfig.java

@@ -15,6 +15,8 @@ public class DefaultConfig extends ConfigurationFile {
     @Getter
     private static boolean forceResourcePack;
     @Getter
+    private static boolean autoMixOnStartup;
+    @Getter
     private static String resourcePackPrompt;
     @Getter
     private static String resourcePackRerouting;
@@ -54,6 +56,11 @@ public void initializeValues() {
         forceResourcePack = ConfigurationEngine.setBoolean(
                 List.of("Sets whether the resource pack use will be forced to clients"),
                 fileConfiguration, "forceResourcePack", false);
+        autoMixOnStartup = ConfigurationEngine.setBoolean(
+                List.of(
+                        "Enable automatic resource pack mixing when the server starts.",
+                        "If disabled, ResourcePackManager will wait for a resource pack change or manual reload before mixing."),
+                fileConfiguration, "autoMixOnStartup", true);
         resourcePackPrompt = ConfigurationEngine.setString(
                 List.of("Sets whether the resource pack use will be forced to clients"),
                 fileConfiguration, "resourcePackPrompt", "Use recommended resource pack?");

src/main/java/com/magmaguy/resourcepackmanager/mixer/Mix.java

@@ -256,6 +256,24 @@ private static void createOutputDefaultElements() {
 //            generateBedrockResourcePack();
     }
 
+    public static boolean loadExistingFinalResourcePack() {
+        if (finalResourcePack != null) return true;
+        File possiblePack = new File(getOutputFolder().getAbsolutePath() + File.separatorChar + resourcePackName + ".zip");
+        if (!possiblePack.exists()) return false;
+        try {
+            finalResourcePack = possiblePack;
+            finalSHA1 = SHA1Generator.sha1CodeString(finalResourcePack);
+            finalSHA1Bytes = SHA1Generator.sha1CodeByteArray(finalResourcePack);
+            return true;
+        } catch (Exception e) {
+            Logger.warn("Failed to load existing merged resource pack from disk.");
+            finalResourcePack = null;
+            finalSHA1 = null;
+            finalSHA1Bytes = null;
+            return false;
+        }
+    }
+
     private static File getOutputFolder() {
         return new File(ResourcePackManager.plugin.getDataFolder().getAbsolutePath() + File.separatorChar + "output");
     }

src/main/java/com/magmaguy/resourcepackmanager/thirdparty/ThirdPartyResourcePack.java

@@ -113,6 +113,7 @@ public ThirdPartyResourcePack(String pluginName, String localPath, String url, b
     }
 
     private static BukkitTask resourcePackChangeWatcher = null;
+    private static boolean initialStartup = true;
 
     /**
      * Checks whether a monitored plugin has finished its Magmacore initialization.
@@ -189,13 +190,30 @@ public void run() {
                 }
 
                 if (!stableAlreadySent && readyToSend) {
+                    if (!DefaultConfig.isAutoMixOnStartup() && initialStartup) {
+                        Logger.info("Automatic resource pack mixing on startup is disabled. Waiting for resource pack changes or manual reload before mixing.");
+                        tagAsResourcePackSent();
+                        initialStartup = false;
+                        return;
+                    }
+
                     notifyResourcePackSending();
                     tagAsResourcePackSent();
+                    initialStartup = false;
                     Logger.info("Sending resource pack now.");
                     Bukkit.getScheduler().runTaskAsynchronously(ResourcePackManager.plugin, Mix::mixResourcePacks);
                 }
             }
         }.runTaskTimerAsynchronously(ResourcePackManager.plugin, 20, 20);
+
+        if (!DefaultConfig.isAutoMixOnStartup()) {
+            if (Mix.loadExistingFinalResourcePack()) {
+                Logger.info("autoMixOnStartup is disabled, reusing the last merged resource pack from disk.");
+                AutoHost.initialize();
+            } else {
+                Logger.info("autoMixOnStartup is disabled and no existing merged resource pack was found. Waiting for changes.");
+            }
+        }
     }
 
     public static void tagAsResourcePackSent(){