MiniGames/src/main/java/net/knarcraft/minigames/command/MenuCommand.java

package net.knarcraft.minigames.command;

import net.knarcraft.minigames.MiniGames;
import net.knarcraft.minigames.arena.ArenaSession;
import net.knarcraft.minigames.config.Message;
import net.knarcraft.minigames.gui.MiniGamesGUI;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.command.TabExecutor;
import org.bukkit.entity.Player;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.ArrayList;
import java.util.List;

/**
 * The command for opening up an arena's menu
 */
public class MenuCommand implements TabExecutor {

    @Override
    public boolean onCommand(@NotNull CommandSender commandSender, @NotNull Command command, @NotNull String s,
                             @NotNull String[] arguments) {
        if (!(commandSender instanceof Player player)) {
            commandSender.sendMessage(Message.ERROR_PLAYER_ONLY.getMessage());
            return false;
        }

        ArenaSession existingSession = MiniGames.getInstance().getSession(player.getUniqueId());
        if (existingSession == null) {
            new MiniGamesGUI(player).openFor(player);
            return false;
        } else {
            existingSession.getGUI().openFor(player);
            return true;
        }
    }

    @Nullable
    @Override
    public List<String> onTabComplete(@NotNull CommandSender commandSender, @NotNull Command command, @NotNull String s,
                                      @NotNull String[] strings) {
        return new ArrayList<>();
    }

}