Add a proper gamemode command

src/main/java/dev/plex/command/impl/GamemodeCMD.java

@@ -0,0 +1,103 @@
+package dev.plex.command.impl;
+
+import dev.plex.command.PlexCommand;
+import dev.plex.command.annotation.CommandParameters;
+import dev.plex.command.annotation.CommandPermissions;
+import dev.plex.command.exception.CommandFailException;
+import dev.plex.command.source.RequiredCommandSource;
+import dev.plex.event.GameModeUpdateEvent;
+import dev.plex.rank.enums.Rank;
+import dev.plex.util.PlexUtils;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import net.kyori.adventure.text.Component;
+import org.bukkit.Bukkit;
+import org.bukkit.GameMode;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+@CommandParameters(name = "gamemode", usage = "/<command> <creative | survival | adventure | default | spectator> [player]", description = "Change your gamemode", aliases = "gm, egamemode, egamemode")
+@CommandPermissions(level = Rank.OP, permission = "plex.gamemode", source = RequiredCommandSource.ANY)
+public class GamemodeCMD extends PlexCommand
+{
+    private GameMode gamemode;
+
+    @Override
+    protected Component execute(@NotNull CommandSender sender, @Nullable Player playerSender, String[] args)
+    {
+        if (args.length == 0)
+        {
+            return usage();
+        }
+        switch (args[0].toLowerCase())
+        {
+            case "creative", "c", "1" ->
+            {
+                gamemode = GameMode.CREATIVE;
+                update(sender, playerSender, GameMode.CREATIVE);
+                return null;
+            }
+            case "survival", "s", "0" ->
+            {
+                gamemode = GameMode.SURVIVAL;
+                update(sender, playerSender, GameMode.SURVIVAL);
+                return null;
+            }
+            case "adventure", "a", "2" ->
+            {
+                gamemode = GameMode.ADVENTURE;
+                update(sender, playerSender, GameMode.ADVENTURE);
+                return null;
+            }
+            case "default", "d", "5" ->
+            {
+                gamemode = plugin.getServer().getDefaultGameMode();
+                update(sender, playerSender, plugin.getServer().getDefaultGameMode());
+                return null;
+            }
+            case "spectator", "sp", "3", "6" ->
+            {
+                gamemode = GameMode.SPECTATOR;
+                checkRank(sender, Rank.ADMIN, "plex.gamemode.spectator");
+                update(sender, playerSender, GameMode.SPECTATOR);
+                return null;
+            }
+        }
+        if (args.length > 1)
+        {
+            checkRank(sender, Rank.ADMIN, "plex.gamemode.others");
+            Player player = getNonNullPlayer(args[1]);
+            Bukkit.getServer().getPluginManager().callEvent(new GameModeUpdateEvent(sender, player, gamemode));
+        }
+        return null;
+    }
+
+    private void update(CommandSender sender, Player playerSender, GameMode gameMode)
+    {
+        if (isConsole(sender))
+        {
+            throw new CommandFailException(PlexUtils.messageString("consoleMustDefinePlayer"));
+        }
+        if (!(playerSender == null))
+        {
+            Bukkit.getServer().getPluginManager().callEvent(new GameModeUpdateEvent(sender, playerSender.getPlayer(), gameMode));
+        }
+    }
+
+    @Override
+    public @NotNull List<String> tabComplete(@NotNull CommandSender sender, @NotNull String alias, @NotNull String[] args) throws IllegalArgumentException
+    {
+        if (args.length == 1)
+        {
+            return Arrays.asList("creative", "survival", "adventure", "spectator", "default");
+        }
+        if (args.length == 2)
+        {
+            return PlexUtils.getPlayerNameList();
+        }
+        return Collections.emptyList();
+    }
+}

src/main/resources/commands.yml

@@ -52,6 +52,4 @@ commands:
   - "m:e:weather:_"
   - "m:e:worldborder:<gray>The worldborder does not need to be changed. This command is disabled."
   - "r:a:^(co|core|coreprotect) (rb|rollback|l|lookup|rl|reload):_"
-  - "r:a:^(gamemode|gm) [^ ]+ .*:<gray>You cannot change the gamemode of other players!"
-  - "r:a:^(gamemode|gm|egamemode|egm) (spectator|sp|3):<gray>You cannot use spectator mode!"
   - "r:e:^[A-z]*:[A-z]*::<gray>Plugin specific commands are disabled."