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.OfflinePlayer;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.util.StringUtil;

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

public class OpCommand extends VanillaCommand
{
	public OpCommand()
	{
		super("op");
		this.description = "Gives the specified player operator status";
		this.usageMessage = "/op <player>";
		this.setPermission("bukkit.command.op.give");
	}

	@Override
	public boolean execute(CommandSender sender, String currentAlias, String[] args)
	{
		if(!testPermission(sender)) return true;
		if(args.length != 1 || args[0].length() == 0)
		{
			sender.sendMessage(ChatColor.RED + "Usage: " + usageMessage);
			return false;
		}

		OfflinePlayer player = Bukkit.getOfflinePlayer(args[0]);
		player.setOp(true);

		Command.broadcastCommandMessage(sender, "Opped " + args[0]);
		return true;
	}

	@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 == 1)
		{
			if(!(sender instanceof Player))
			{
				return ImmutableList.of();
			}

			String lastWord = args[0];
			if(lastWord.length() == 0)
			{
				return ImmutableList.of();
			}

			Player senderPlayer = (Player) sender;

			ArrayList<String> matchedPlayers = new ArrayList<String>();
			for(Player player : sender.getServer().getOnlinePlayers())
			{
				String name = player.getName();
				if(!senderPlayer.canSee(player) || player.isOp())
				{
					continue;
				}
				if(StringUtil.startsWithIgnoreCase(name, lastWord))
				{
					matchedPlayers.add(name);
				}
			}

			Collections.sort(matchedPlayers, String.CASE_INSENSITIVE_ORDER);
			return matchedPlayers;
		}
		return ImmutableList.of();
	}
}