package org.bukkit.help;

import org.apache.commons.lang.StringUtils;
import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.command.ConsoleCommandSender;
import org.bukkit.command.defaults.VanillaCommand;

/**
 * Lacking an alternative, the help system will create instances of
 * GenericCommandHelpTopic for each command in the server's CommandMap. You
 * can use this class as a base class for custom help topics, or as an example
 * for how to write your own.
 */
public class GenericCommandHelpTopic extends HelpTopic
{

	protected Command command;

	public GenericCommandHelpTopic(Command command)
	{
		this.command = command;

		if(command.getLabel().startsWith("/"))
		{
			name = command.getLabel();
		}
		else
		{
			name = "/" + command.getLabel();
		}

		// The short text is the first line of the description
		int i = command.getDescription().indexOf("\n");
		if(i > 1)
		{
			shortText = command.getDescription().substring(0, i - 1);
		}
		else
		{
			shortText = command.getDescription();
		}

		// Build full text
		StringBuffer sb = new StringBuffer();

		sb.append(ChatColor.GOLD);
		sb.append("Description: ");
		sb.append(ChatColor.WHITE);
		sb.append(command.getDescription());

		sb.append("\n");

		sb.append(ChatColor.GOLD);
		sb.append("Usage: ");
		sb.append(ChatColor.WHITE);
		sb.append(command.getUsage().replace("<command>", name.substring(1)));

		if(command.getAliases().size() > 0)
		{
			sb.append("\n");
			sb.append(ChatColor.GOLD);
			sb.append("Aliases: ");
			sb.append(ChatColor.WHITE);
			sb.append(ChatColor.WHITE + StringUtils.join(command.getAliases(), ", "));
		}
		fullText = sb.toString();
	}

	public boolean canSee(CommandSender sender)
	{
		if(!command.isRegistered() && !(command instanceof VanillaCommand))
		{
			// Unregistered commands should not show up in the help (ignore VanillaCommands)
			return false;
		}

		if(sender instanceof ConsoleCommandSender)
		{
			return true;
		}

		if(amendedPermission != null)
		{
			return sender.hasPermission(amendedPermission);
		}
		else
		{
			return command.testPermissionSilent(sender);
		}
	}
}