/**
 * 
 */
package anoncard.util;

/**
 * @author christoph
 * 
 */
public class Helpers {

	/**
	 * Compares the response from an ResponseException (see aspects) with a
	 * expected response.
	 * 
	 * @param actual
	 * @param expected
	 * @return
	 */
	public static boolean checkResponseInException(ResponseException actual, byte[] expected) {
		if (actual.getResponse() == null) {
			return false;
		}
		return actual.getResponse().equals(makeResponse(expected));
	}

	/**
	 * Compares the response from an ISOExceptionException (see aspects) with a
	 * expected response.
	 * 
	 * @param actual
	 * @param expected
	 * @return
	 */
	public static boolean checkErrorCodeInException(ISOExceptionException actual, short expected) {
		if (actual.getErrorCode() == null) {
			return false;
		}
		return actual.getErrorCode().equals(shortToHexString(expected));
	}

	/**
	 * Makes the buffer of an response apdu to a string.
	 * 
	 * @param buffer
	 * @return
	 */
	public static String makeResponse(byte[] buffer) {
		return mixconfig.tools.dataretention.smartcard.Helpers.bytesToHexDigits(buffer);
	}

	/**
	 * Makes the error code of an response apdu to a string.
	 * 
	 * @param errorCode
	 * @return
	 */
	public static String shortToHexString(short errorCode) {
		String hexString = "";
		hexString += mixconfig.tools.dataretention.smartcard.Helpers.toHexChar((errorCode / (16 * 16 * 16)));
		errorCode %= 16 * 16 * 16;
		hexString += mixconfig.tools.dataretention.smartcard.Helpers.toHexChar((errorCode / (16 * 16))) + " ";
		errorCode %= 16 * 16;
		hexString += mixconfig.tools.dataretention.smartcard.Helpers.toHexChar((errorCode / 16));
		errorCode %= 16;
		hexString += mixconfig.tools.dataretention.smartcard.Helpers.toHexChar(errorCode);
		return hexString;
	}

	/**
	 * Creates a readable output message on case, the actual response is not as
	 * expected.
	 * 
	 * @param actual
	 * @param expected
	 * @return
	 */
	public static String alertResponseMismatch(ResponseException actual, byte[] expected) {
		String message = "response mismatch\nactual:\t";
		message += actual.getResponse();
		message += "\nexpect:\t" + makeResponse(expected);
		return message;
	}

	/**
	 * Creates a readable output message on case, the actual error code is not
	 * as expected.
	 * 
	 * @param actual
	 * @param expected
	 * @return
	 */
	public static String alertResponseMismatch(ISOExceptionException actual, short expected) {
		return "response mismatch\nactual:\t" + actual.getErrorCode() + "\nexpect:\t" + shortToHexString(expected);
	}
}