package launchserver.command.basic;

import java.util.Map;

import launcher.helper.LogHelper;
import launchserver.LaunchServer;
import launchserver.command.Command;
import launchserver.command.CommandException;

public final class HelpCommand extends Command {
	public HelpCommand(LaunchServer server) {
		super(server);
	}

	@Override
	public String getArgsDescription() {
		return "[command name]";
	}

	@Override
	public String getUsageDescription() {
		return "Print command usage";
	}

	@Override
	public void invoke(String... args) throws CommandException {
		if (args.length < 1) {
			printCommands();
			return;
		}

		// Print command help
		printCommand(args[0]);
	}

	private void printCommand(String name) throws CommandException {
		printCommand(name, server.commandHandler.lookup(name));
	}

	private void printCommands() {
		for (Map.Entry<String, Command> entry : server.commandHandler.commandsMap().entrySet()) {
			printCommand(entry.getKey(), entry.getValue());
		}
	}

	private static void printCommand(String name, Command command) {
		String args = command.getArgsDescription();
		LogHelper.subInfo("%s %s - %s", name, args == null ? "[nothing]" : args, command.getUsageDescription());
	}
}