Implement ServerLuaCall

src/main/java/emu/grasscutter/game/ability/actions/ActionServerLuaCall.java

@@ -0,0 +1,66 @@
+package emu.grasscutter.game.ability.actions;
+
+import com.google.protobuf.ByteString;
+import emu.grasscutter.Grasscutter;
+import emu.grasscutter.data.binout.AbilityModifier.AbilityModifierAction;
+import emu.grasscutter.game.ability.Ability;
+import emu.grasscutter.game.entity.GameEntity;
+import org.luaj.vm2.LuaFunction;
+
+import javax.script.Bindings;
+
+@AbilityAction(AbilityModifierAction.Type.ServerLuaCall)
+public final class ActionServerLuaCall extends AbilityActionHandler {
+    @Override
+    public boolean execute(
+            Ability ability, AbilityModifierAction action,
+            ByteString abilityData, GameEntity target
+    ) {
+        var scene = target.getScene();
+        var scriptManager = scene.getScriptManager();
+        var functionName = action.funcName;
+
+        return switch (action.luaCallType) {
+            default -> false;
+            case FromGroup -> {
+                var groupId = target.getGroupId();
+                var group = scriptManager.getGroupById(groupId);
+                var script = group.getBindings();
+
+                yield ActionServerLuaCall.callFunction(script, functionName);
+            }
+            case SpecificGroup -> {
+                var groupId = action.callParamList[0];
+                var group = scriptManager.getGroupById(groupId);
+                var script = group.getBindings();
+
+                yield ActionServerLuaCall.callFunction(script, functionName);
+            }
+        };
+    }
+
+    /**
+     * Handles fetching and calling a function.
+     *
+     * @param bindings The bindings to fetch the function from.
+     * @param functionName The name of the function to call.
+     * @return Whether the function was called successfully.
+     */
+    private static boolean callFunction(Bindings bindings, String functionName) {
+        try {
+            // Resolve the function from the script.
+            var function = bindings.get(functionName);
+            if (!(function instanceof LuaFunction luaFunction))
+                throw new Exception("Function is not a LuaFunction.");
+
+            // Attempt to invoke the function.
+            luaFunction.call();
+
+            return true;
+        } catch (Exception exception) {
+            Grasscutter.getLogger().warn("Unable to invoke {}.",
+                    functionName, exception);
+            return false;
+        }
+    }
+}