package launchserver.command;

import java.util.UUID;

import launcher.LauncherAPI;
import launcher.helper.VerifyHelper;
import launchserver.LaunchServer;

public abstract class Command {
	@LauncherAPI protected final LaunchServer server;

	@LauncherAPI
	protected Command(LaunchServer server) {
		this.server = server;
	}

	@LauncherAPI
	public abstract String getArgsDescription(); // "<required> [optional]"

	@LauncherAPI
	public abstract String getUsageDescription();

	@LauncherAPI
	public abstract void invoke(String... args) throws Exception;

	@LauncherAPI
	protected final void verifyArgs(String[] args, int min) throws CommandException {
		if (args.length < min) {
			throw new CommandException("Command usage: " + getArgsDescription());
		}
	}

	@LauncherAPI
	protected static UUID parseUUID(String s) throws CommandException {
		try {
			return UUID.fromString(s);
		} catch (IllegalArgumentException ignored) {
			throw new CommandException(String.format("Invalid UUID: '%s'", s));
		}
	}

	@LauncherAPI
	protected static String parseUsername(String username) throws CommandException {
		try {
			return VerifyHelper.verifyUsername(username);
		} catch (IllegalArgumentException e) {
			throw new CommandException(e.getMessage());
		}
	}
}