package net.curisit.securis;

import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;

import net.curisit.securis.beans.RequestBean;
import net.curisit.securis.utils.JsonUtils;
import net.curisit.securis.utils.LicUtils;

import org.apache.commons.io.IOUtils;

public class LicenseValidator {

	public static LicenseValidator singleton = new LicenseValidator();
	private byte[] LOGO_SECRET;

	private LicenseValidator() {
		try {
			LOGO_SECRET = "Logo ipsum s3cr3t test áíóú".getBytes("utf-8");
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
	}

	public static LicenseValidator getInstance() {
		return singleton;
	}

	/**
	 * @return true if logo is correct
	 */
	public String getCrcLogo() {
		InputStream is = getClass().getClassLoader().getResourceAsStream("images/logo_customer.png");
		try {
			String shaLogo = LicUtils.sha256(IOUtils.toByteArray(is), LOGO_SECRET);
			return shaLogo;
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		}
	}

	public void validateLogo(RequestBean reqBean) throws SeCurisException {
		String currentCRC = getCrcLogo();
		if (!currentCRC.equals(reqBean.getCrcLogo()))
			throw new SeCurisException("License logo validation failed for request data: " + JsonUtils.toJSON(reqBean));
	}

	public void validateHW(RequestBean reqBean, String appCode, String customerCode) throws SeCurisException {
		RequestBean currentHW = ReqGenerator.getInstance().createRequest(appCode, customerCode);
		if (!currentHW.match(reqBean))
			throw new SeCurisException("Current System info mismatch the License System info: " + JsonUtils.toJSON(reqBean));
	}

}