Add existing commands

src/main/java/emu/grasscutter/commands/ServerCommands.java

+package emu.grasscutter.commands;
+
+import emu.grasscutter.Grasscutter;
+import emu.grasscutter.database.DatabaseHelper;
+import emu.grasscutter.game.Account;
+import emu.grasscutter.game.GenshinPlayer;
+
+import java.util.List;
+
+/**
+ * A container for server-related commands.
+ */
+public final class ServerCommands {
+    @Command(label = "reload", usage = "Usage: reload")
+    public static class ReloadCommand implements CommandHandler {
+
+        @Override
+        public void execute(List<String> args) {
+            Grasscutter.getLogger().info("Reloading config.");
+            Grasscutter.loadConfig();
+            Grasscutter.getDispatchServer().loadQueries();
+            Grasscutter.getLogger().info("Reload complete.");
+        }
+
+        @Override
+        public void execute(GenshinPlayer player, List<String> args) {
+            this.execute(args);
+        }
+    }
+    
+    @Command(label = "sendmessage", aliases = {"sendmsg", "msg"}, 
+            usage = "Usage: sendmessage <player> <message>")
+    public static class SendMessageCommand implements CommandHandler {
+
+        @Override
+        public void execute(List<String> args) {
+            if(args.size() < 2) {
+                CommandHandler.sendMessage(null, "Usage: sendmessage <player> <message>"); return;
+            }
+            
+            try {
+                int target = Integer.parseInt(args.get(0));
+                String message = String.join(" ", args.subList(1, args.size()));
+
+                GenshinPlayer targetPlayer = Grasscutter.getGameServer().getPlayerById(target);
+                if(targetPlayer == null) {
+                    CommandHandler.sendMessage(null, "Player not found."); return;
+                }
+                
+                targetPlayer.dropMessage(message);
+                CommandHandler.sendMessage(null, "Message sent.");
+            } catch (NumberFormatException ignored) {
+                CommandHandler.sendMessage(null, "Invalid player ID.");
+            }
+        }
+
+        @Override
+        public void execute(GenshinPlayer player, List<String> args) {
+            if(args.size() < 2) {
+                CommandHandler.sendMessage(null, "Usage: sendmessage <player> <message>"); return;
+            }
+
+            try {
+                int target = Integer.parseInt(args.get(0));
+                String message = String.join(" ", args.subList(1, args.size()));
+
+                GenshinPlayer targetPlayer = Grasscutter.getGameServer().getPlayerById(target);
+                if(targetPlayer == null) {
+                    CommandHandler.sendMessage(null, "Player not found."); return;
+                }
+
+                targetPlayer.sendMessage(player, message);
+                CommandHandler.sendMessage(null, "Message sent.");
+            } catch (NumberFormatException ignored) {
+                CommandHandler.sendMessage(null, "Invalid player ID.");
+            }
+        }
+    }
+    
+    @Command(label = "account", 
+            usage = "Usage: account <create|delete> <username> [uid]", 
+            execution = Command.Execution.CONSOLE)
+    public static class AccountCommand implements CommandHandler {
+
+        @Override
+        public void execute(List<String> args) {
+            if(args.size() < 2) {
+                CommandHandler.sendMessage(null, "Usage: account <create|delete> <username> [uid]"); return;
+            }
+            
+            String action = args.get(0);
+            String username = args.get(1);
+            
+            switch(action) {
+                default:
+                    CommandHandler.sendMessage(null, "Usage: account <create|delete> <username> [uid]");
+                    return;
+                case "create":
+                    int uid = 0;
+                    if(args.size() > 2) {
+                        try {
+                            uid = Integer.parseInt(args.get(2));
+                        } catch (NumberFormatException ignored) {
+                            CommandHandler.sendMessage(null, "Invalid UID."); return;
+                        }
+                    }
+
+                    Account account = DatabaseHelper.createAccountWithId(username, uid);
+                    if(account == null) {
+                        CommandHandler.sendMessage(null, "Account already exists."); return;
+                    } else CommandHandler.sendMessage(null, "Account created with UID " + account.getId() + ".");
+                    return;
+                case "delete":
+                    if(DatabaseHelper.deleteAccount(username)) {
+                        CommandHandler.sendMessage(null, "Account deleted."); return;
+                    } else CommandHandler.sendMessage(null, "Account not found.");
+                    return;
+            }
+        }
+    }
+}

src/main/java/emu/grasscutter/game/GenshinPlayer.java

@@ -485,7 +485,7 @@ public class GenshinPlayer {
 		this.regionId = regionId;
 	}
 	
-	public boolean hasGodmode() {
+	public boolean inGodmode() {
 		return godmode;
 	}
 
@@ -558,6 +558,15 @@ public class GenshinPlayer {
 	public void dropMessage(Object message) {
 		this.sendPacket(new PacketPrivateChatNotify(GenshinConstants.SERVER_CONSOLE_UID, getId(), message.toString()));
 	}
+
+	/**
+	 * Sends a message to another player.
+	 * @param sender The sender of the message.
+	 * @param message The message to send.
+	 */
+	public void sendMessage(GenshinPlayer sender, Object message) {
+		this.sendPacket(new PacketPrivateChatNotify(sender.getId(), this.getId(), message.toString()));
+	}
 	
 	public void interactWith(int gadgetEntityId) {
 		GenshinEntity entity = getWorld().getEntityById(gadgetEntityId);

src/main/java/emu/grasscutter/game/World.java

@@ -344,7 +344,7 @@ public class World implements Iterable<GenshinPlayer> {
 		
 		// Godmode check
 		if (target instanceof EntityAvatar) {
-			if (((EntityAvatar) target).getPlayer().hasGodmode()) {
+			if (((EntityAvatar) target).getPlayer().inGodmode()) {
 				return;
 			}
 		}

src/main/java/emu/grasscutter/utils/Utils.java

@@ -118,6 +118,16 @@ public final class Utils {
 		}
 	}
 
+	/**
+	 * Get object with null fallback.
+	 * @param nonNull The object to return if not null.
+	 * @param fallback The object to return if null.
+	 * @return One of the two provided objects.
+	 */
+	public static <T> T requireNonNullElseGet(T nonNull, T fallback) {
+		return nonNull != null ? nonNull : fallback;
+	}
+
 	/**
 	 * Checks for required files and folders before startup.
 	 */