package org.bukkit.command.defaults;

import com.google.common.collect.ImmutableList;
import org.apache.commons.lang.Validate;
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;

import java.util.List;

public class ExpCommand extends VanillaCommand
{
	public ExpCommand()
	{
		super("xp");
		this.description = "Gives the specified player a certain amount of experience. Specify <amount>L to give levels instead, with a negative amount resulting in taking levels.";
		this.usageMessage = "/xp <amount> [player] OR /xp <amount>L [player]";
		this.setPermission("bukkit.command.xp");
	}

	@Override
	public boolean execute(CommandSender sender, String currentAlias, String[] args)
	{
		if(!testPermission(sender)) return true;

		if(args.length > 0)
		{
			String inputAmount = args[0];
			Player player = null;

			boolean isLevel = inputAmount.endsWith("l") || inputAmount.endsWith("L");
			if(isLevel && inputAmount.length() > 1)
			{
				inputAmount = inputAmount.substring(0, inputAmount.length() - 1);
			}

			int amount = getInteger(sender, inputAmount, Integer.MIN_VALUE, Integer.MAX_VALUE);
			boolean isTaking = amount < 0;

			if(isTaking)
			{
				amount *= -1;
			}

			if(args.length > 1)
			{
				player = Bukkit.getPlayer(args[1]);
			}
			else if(sender instanceof Player)
			{
				player = (Player) sender;
			}

			if(player != null)
			{
				if(isLevel)
				{
					if(isTaking)
					{
						player.giveExpLevels(-amount);
						Command.broadcastCommandMessage(sender, "Taken " + amount + " level(s) from " + player.getName());
					}
					else
					{
						player.giveExpLevels(amount);
						Command.broadcastCommandMessage(sender, "Given " + amount + " level(s) to " + player.getName());
					}
				}
				else
				{
					if(isTaking)
					{
						sender.sendMessage(ChatColor.RED + "Taking experience can only be done by levels, cannot give players negative experience points");
						return false;
					}
					else
					{
						player.giveExp(amount);
						Command.broadcastCommandMessage(sender, "Given " + amount + " experience to " + player.getName());
					}
				}
			}
			else
			{
				sender.sendMessage("Can't find player, was one provided?\n" + ChatColor.RED + "Usage: " + usageMessage);
				return false;
			}

			return true;
		}

		sender.sendMessage(ChatColor.RED + "Usage: " + usageMessage);
		return false;
	}

	@Override
	public List<String> tabComplete(CommandSender sender, String alias, String[] args) throws IllegalArgumentException
	{
		Validate.notNull(sender, "Sender cannot be null");
		Validate.notNull(args, "Arguments cannot be null");
		Validate.notNull(alias, "Alias cannot be null");

		if(args.length == 2)
		{
			return super.tabComplete(sender, alias, args);
		}
		return ImmutableList.of();
	}
}