feat: basic placeholderapi support

nicko-core/src/main/java/net/artelnatif/nicko/NickoBukkit.java

@@ -14,6 +14,7 @@ import net.artelnatif.nicko.i18n.LocaleManager;
 import net.artelnatif.nicko.impl.Internals;
 import net.artelnatif.nicko.impl.InternalsProvider;
 import net.artelnatif.nicko.mojang.MojangAPI;
+import net.artelnatif.nicko.placeholder.PlaceHolderHook;
 import net.artelnatif.nicko.pluginchannel.PluginMessageHandler;
 import net.artelnatif.nicko.storage.PlayerDataStore;
 import net.artelnatif.nicko.utils.ServerUtils;
@@ -71,9 +72,12 @@ public class NickoBukkit extends JavaPlugin {
                 getLogger().warning("Failed to open persistence, data will NOT be saved!");
             }
 
-            ServerUtils.checkSpigotBungeeCordHook();
+            new PlaceHolderHook(this).hook();
+
+            final ServerUtils serverUtils = new ServerUtils(this);
+            serverUtils.checkSpigotBungeeCordHook();
             if (nickoConfiguration.isBungeecordEnabled()) {
-                if (ServerUtils.checkBungeeCordHook()) {
+                if (serverUtils.checkBungeeCordHook()) {
                     getLogger().info("Enabling BungeeCord support...");
                     getServer().getMessenger().registerIncomingPluginChannel(this, NickoBungee.NICKO_PLUGIN_CHANNEL_UPDATE, new PluginMessageHandler());
                 }

nicko-core/src/main/java/net/artelnatif/nicko/placeholder/NickoExpension.java

@@ -0,0 +1,52 @@
+package net.artelnatif.nicko.placeholder;
+
+import me.clip.placeholderapi.expansion.PlaceholderExpansion;
+import net.artelnatif.nicko.NickoBukkit;
+import net.artelnatif.nicko.disguise.NickoProfile;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Optional;
+
+public class NickoExpension extends PlaceholderExpansion {
+
+    private final NickoBukkit instance;
+
+    public NickoExpension(NickoBukkit instance) {
+        this.instance = instance;
+    }
+
+    @Override
+    public @NotNull String getIdentifier() {
+        return "nicko";
+    }
+
+    @Override
+    public @NotNull String getAuthor() {
+        return "Aro";
+    }
+
+    @Override
+    public @NotNull String getVersion() {
+        return "1.0.0";
+    }
+
+
+    @Override
+    public @Nullable String onPlaceholderRequest(Player player, @NotNull String params) {
+        Optional<NickoProfile> optionalProfile = instance.getDataStore().getData(player.getUniqueId());
+        if (optionalProfile.isPresent()) {
+            final NickoProfile profile = optionalProfile.get();
+            return switch (params) {
+                case "name" -> profile.getName();
+                case "skin" -> profile.getSkin();
+                case "locale" -> profile.getLocale().getName();
+                case "bungeecord" -> String.valueOf(profile.isBungeecordTransfer());
+            };
+        } else {
+            instance.getLogger().severe("Couldn't satisfy request for placeholder " + params + ". This is a bug!");
+            return null;
+        }
+    }
+}

nicko-core/src/main/java/net/artelnatif/nicko/placeholder/PlaceHolderHook.java

@@ -0,0 +1,20 @@
+package net.artelnatif.nicko.placeholder;
+
+import net.artelnatif.nicko.NickoBukkit;
+import org.bukkit.Bukkit;
+
+public class PlaceHolderHook {
+    private final NickoBukkit instance;
+
+    public PlaceHolderHook(NickoBukkit instance) {
+        this.instance = instance;
+    }
+
+    public void hook() {
+        instance.getLogger().info("Checking support for PlaceHolderAPI...");
+        if (Bukkit.getPluginManager().getPlugin("PlaceholderAPI") != null) {
+            new NickoExpension(instance).register();
+            instance.getLogger().info("Hooked into PlaceHolderAPI!");
+        }
+    }
+}