package net.curisit.securis;

import java.io.File;
import java.io.IOException;

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

import org.apache.commons.io.FileUtils;

/**
 * Manage all licenses tasks, just like, validation, sync, requesting, ...
 * 
 * @author roberto <roberto.sanchez@curisit.net>
 */
public class LicenseManager {

	private static LicenseManager singleton = new LicenseManager();

	private LicenseManager() {
	}

	public static LicenseManager getInstance() {
		return singleton;
	}

	public LicenseBean validateLicense(File licFile, String appCode, String customerCode) throws SeCurisException {
		LicenseBean licBean;
		try {
			licBean = JsonUtils.json2object(FileUtils.readFileToString(licFile), LicenseBean.class);
		} catch (IOException e) {
			throw new SeCurisException("Error validating license", e);
		}
		SignatureHelper.getInstance().validateSignature(licBean);
		validateHW(licBean, appCode, customerCode);

		return licBean;
	}

	private 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));
	}

}