package org.bukkit.craftbukkit.help;

import org.apache.commons.lang.Validate;
import org.bukkit.ChatColor;
import org.bukkit.command.CommandSender;
import org.bukkit.help.HelpMap;
import org.bukkit.help.HelpTopic;

public class CommandAliasHelpTopic extends HelpTopic
{

	private final String aliasFor;
	private final HelpMap helpMap;

	public CommandAliasHelpTopic(String alias, String aliasFor, HelpMap helpMap)
	{
		this.aliasFor = aliasFor.startsWith("/") ? aliasFor : "/" + aliasFor;
		this.helpMap = helpMap;
		this.name = alias.startsWith("/") ? alias : "/" + alias;
		Validate.isTrue(!this.name.equals(this.aliasFor), "Command " + this.name + " cannot be alias for itself");
		this.shortText = ChatColor.YELLOW + "Alias for " + ChatColor.WHITE + this.aliasFor;
	}

	@Override
	public String getFullText(CommandSender forWho)
	{
		StringBuilder sb = new StringBuilder(shortText);
		HelpTopic aliasForTopic = helpMap.getHelpTopic(aliasFor);
		if(aliasForTopic != null)
		{
			sb.append("\n");
			sb.append(aliasForTopic.getFullText(forWho));
		}
		return sb.toString();
	}

	@Override
	public boolean canSee(CommandSender commandSender)
	{
		if(amendedPermission == null)
		{
			HelpTopic aliasForTopic = helpMap.getHelpTopic(aliasFor);
			if(aliasForTopic != null)
			{
				return aliasForTopic.canSee(commandSender);
			}
			else
			{
				return false;
			}
		}
		else
		{
			return commandSender.hasPermission(amendedPermission);
		}
	}
}