Bakari's Hammer

import java.awt.Desktop.Action;
/***************************************
 * @GrumpyKnick
 * 29 January 2015
 * Version: 1.0
 * Bakari's Hammer plugin for Combatant Job
 ****************************************/

import java.security.Permission;
import java.util.HashMap;

import javax.swing.text.html.parser.Entity;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.EntityType;
import org.bukkit.entity.Player;
import org.bukkit.entity.TNTPrimed;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.BlockPlaceEvent;
import org.bukkit.event.entity.EntityExplodeEvent;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.block.*;

public class Hammer extends JavaPlugin implements Listener {
    public HashMap<String, Long> cooldowns = new HashMap<String, Long>();
	/*******************************************************
	 * Pre-Condition: Player is level 10+ Combatant
	 * Post-Condition: TNT spawned when Right click sulphur
	 * 	tnt spawn and kill surrounding mobs without damaging the
	 * 	area around it
	 *******************************************************/
	boolean activated = false;
	long cooldownLength = 1800;

	@Override
	public void onEnable() {
		System.out.println("[Bakari's Hammer] is running");
		Bukkit.getServer().getPluginManager().registerEvents(this, this);}

	@Override
	public void onDisable() {
		System.out.println("[Bakari's Hammer] is not running"); }

	public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
		Player p = (Player)sender;

		if (cmd.getName().equalsIgnoreCase("hammer") || cmd.getName().equalsIgnoreCase("tnt")) {
			if (p.hasPermission("Permission.hammer")) {
				if (activated == true) {
					p.sendMessage(ChatColor.DARK_PURPLE + "[Bakari]:" + ChatColor.WHITE + "You have deactivated the Bakari TnT wrath!");
					activated = false; }
				else {
					p.sendMessage(ChatColor.DARK_PURPLE + "[Bakari]:" + ChatColor.WHITE + "You have activated the Bakari TnT wrath!");
					activated = true;
				}
			}
		}
		return false;
	}
    public void addCooldown(Player p, int seconds) {
        cooldownLength = (System.currentTimeMillis() + seconds * 1000);
    }

    public boolean hasCooldown(Player p) {
        return cooldownLength > System.currentTimeMillis();
    }

    public String cooldownTimeLeft(Player p) {
        long left = (cooldownLength - System.currentTimeMillis()) / 1000L;
        if (left < 60) {
            return left + " seconds";
        }
            return left / 60 + " minute(s)";
        }

	@EventHandler
	public void onClick(PlayerInteractEvent event) {
		Player p = event.getPlayer();
		int a = 2;

		//CHECK THE PERMS BELOW PLEASE
		if (p.hasPermission("Lvl10Combatant") && p.hasPermission("towny.wild.item_use") && p.hasPermission("towny.town.item_use")){
			if (event.getAction().equals(Action.RIGHT_CLICK_BLOCK) || event.getAction().equals(Action.RIGHT_CLICK_AIR)) {
				if (p.getInventory().getItemInHand().getType().equals(Material.SULPHUR)) {
					//IM unsure about the whole cooldown system here. Please take a look
					//and edit it as needed please.
					if (hasCooldown(p)) {
		                p.sendMessage(ChatColor.DARK_PURPLE + "[Bakari]: " + ChatColor.WHITE + " It is too soon to do this!"  + cooldownTimeLeft(p));
		                return;
		            }
					else {
						p.sendMessage(ChatColor.DARK_PURPLE + "[Bakari]:" + ChatColor.WHITE + "You have awoken the TnT!");
						//Redefines the TnT as primed
						//CHECK THESE PERMS PT
						if (p.hasPermission("Lvl10Combatant"))
							a = 2;
						else if (p.hasPermission("Lvl15Combatant"))
							a = 4;
						else if (p.hasPermission("Lvl20Combatant"))
							a = 8;
						for (int i = 0; i <= a; i++) {
							TNTPrimed tnt_1 = event.getPlayer().getWorld().spawn(event.getClickedBlock().getLocation().add(-i,1,-i), TNTPrimed.class);
							TNTPrimed tnt_2 = event.getPlayer().getWorld().spawn(event.getClickedBlock().getLocation().add(i,1,i), TNTPrimed.class);
							TNTPrimed tnt_3 = event.getPlayer().getWorld().spawn(event.getClickedBlock().getLocation().add(-i,1,i), TNTPrimed.class);
							TNTPrimed tnt_4 = event.getPlayer().getWorld().spawn(event.getClickedBlock().getLocation().add(i,1,-i), TNTPrimed.class);
							((TNTPrimed)tnt_1).setFuseTicks(15);
							((TNTPrimed)tnt_2).setFuseTicks(15);
							((TNTPrimed)tnt_3).setFuseTicks(15);
							((TNTPrimed)tnt_4).setFuseTicks(15); }
						p.sendMessage(ChatColor.DARK_PURPLE +  "[Bakari]:" + ChatColor.WHITE + " Here we go!");
					}
				}
			}
		}
	}

	@EventHandler
	/**************************************
	 * Makes sure blocks don;t get damaged
	 * Not sure if this INCLUDES mobs.
	 **************************************/
	public void onExplode(EntityExplodeEvent event) {
		if (event.getEntity().getType() == EntityType.PRIMED_TNT) {
			event.blockList().clear(); }
	}
}