Rewrite commands

Signed-off-by: Jaida Wu <mlgmxyysd@meowcat.org>

src/main/java/emu/grasscutter/command/commands/Account.java

@@ -0,0 +1,61 @@
+package emu.grasscutter.command.commands;
+
+import emu.grasscutter.command.Command;
+import emu.grasscutter.command.CommandHandler;
+import emu.grasscutter.database.DatabaseHelper;
+import emu.grasscutter.game.GenshinPlayer;
+
+import java.util.List;
+
+@Command(label = "account", usage = "account <create|delete> <username> [uid]",
+        description = "Modify user accounts")
+public class Account implements CommandHandler {
+
+    @Override
+    public void onCommand(GenshinPlayer sender, List<String> args) {
+        if (sender != null) {
+            CommandHandler.sendMessage(sender, "This command can only be run from the console.");
+            return;
+        }
+
+        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;
+                    }
+                }
+
+                emu.grasscutter.game.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.getPlayerId() + ".");
+                    account.addPermission("*"); // Grant the player superuser permissions.
+                }
+                return;
+            case "delete":
+                if (DatabaseHelper.deleteAccount(username)) {
+                    CommandHandler.sendMessage(null, "Account deleted.");
+                } else {
+                    CommandHandler.sendMessage(null, "Account not found.");
+                }
+        }
+    }
+}