CommandManager.java

package be.isach.ultracosmetics.command;

import be.isach.ultracosmetics.UltraCosmetics;
import be.isach.ultracosmetics.command.subcommands.*;
import be.isach.ultracosmetics.config.MessageManager;
import be.isach.ultracosmetics.util.MathUtils;

import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.command.ConsoleCommandSender;
import org.bukkit.entity.Player;

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

/**
 * Command manager.
 * 
 * @author 	iSach
 * @since 	12-20-2015
 */
public class CommandManager implements CommandExecutor {

    /**
     * List of the registered commands.
     */
    private List<SubCommand> commands = new ArrayList<>();

    private UltraCosmetics ultraCosmetics;

    public CommandManager(UltraCosmetics ultraCosmetics) {
        this.ultraCosmetics = ultraCosmetics;
        this.ultraCosmetics.getServer().getPluginCommand("ultracosmetics").setExecutor(this);
        String[] aliases = {"uc", "cosmetics"};
        this.ultraCosmetics.getServer().getPluginCommand("ultracosmetics").setAliases(Arrays.asList(aliases));
    }

    /**
     * Registers a command.
     *
     * @param meCommand The command to register.
     */
    public void registerCommand(SubCommand meCommand) {
        commands.add(meCommand);
    }

    public void showHelp(CommandSender commandSender, int page) {
        commandSender.sendMessage("");
        commandSender.sendMessage(ChatColor.WHITE + "" + ChatColor.BOLD + "UltraCosmetics Help (/uc <page>) " + ChatColor.DARK_GRAY + "" + ChatColor.BOLD + "(" + page + "/" + getMaxPages() + ")");
        int from = 1;
        if (page > 1)
            from = 8 * (page - 1) + 1;
        int to = 8 * page;
        for (int h = from; h <= to; h++) {
            if (h > commands.size())
                break;
            SubCommand sub = commands.get(h - 1);
            commandSender.sendMessage(ChatColor.DARK_GRAY + "|  " + ChatColor.GRAY + sub.getUsage() + ChatColor.WHITE + " " + ChatColor.ITALIC + sub.getDescription());
        }
    }

    /**
     * Gets the max amount of pages.
     *
     * @return the maximum amount of pages.
     */
    private int getMaxPages() {
        int max = 8;
        int i = commands.size();
        if (i % max == 0) return i / max;
        double j = i / 8;
        int h = (int) Math.floor(j * 100) / 100;
        return h + 1;
    }

    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] arguments) {

        if (!(sender instanceof Player) && !(sender instanceof ConsoleCommandSender)) {
            return false;
        }

        if (arguments == null
                || arguments.length == 0) {
            showHelp(sender, 1);
            return true;
        }

        if (arguments.length == 1 && MathUtils.isInteger(arguments[0])) {
            showHelp(sender, Math.max(1, Math.min(Integer.parseInt(arguments[0]), getMaxPages())));
            return true;
        }

        for (SubCommand meCommand : commands) {
            if (meCommand.is(arguments[0])) {

                if (!sender.hasPermission(meCommand.getPermission())) {
                    sender.sendMessage(MessageManager.getMessage("No-Permission"));
                    return true;
                }

                if (sender instanceof Player) {
                    meCommand.onExePlayer((Player) sender, arguments);
                } else {
                    meCommand.onExeConsole((ConsoleCommandSender) sender, arguments);
                }
                return true;
            }
        }
        showHelp(sender, 1);
        return true;
    }

    public List<SubCommand> getCommands() {
        return commands;
    }

    public void registerCommands(UltraCosmetics ultraCosmetics) {
        registerCommand(new SubCommandGadgets(ultraCosmetics));
        registerCommand(new SubCommandSelfView(ultraCosmetics));
        registerCommand(new SubCommandMenu(ultraCosmetics));
        registerCommand(new SubCommandGive(ultraCosmetics));
        registerCommand(new SubCommandToggle(ultraCosmetics));
        registerCommand(new SubCommandClear(ultraCosmetics));
        registerCommand(new SubCommandTreasure(ultraCosmetics));
    }
}