/*
 * AndFHEM - Open Source Android application to control a FHEM home automation
 * server.
 *
 * Copyright (c) 2011, Matthias Klass or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU GENERAL PUBLIC LICENSE, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU GENERAL PUBLIC LICENSE
 * for more details.
 *
 * You should have received a copy of the GNU GENERAL PUBLIC LICENSE
 * along with this distribution; if not, write to:
 *   Free Software Foundation, Inc.
 *   51 Franklin Street, Fifth Floor
 *   Boston, MA  02110-1301  USA
 */

package li.klass.fhem.billing;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.inject.Inject;
import javax.inject.Singleton;
import javax.security.cert.X509Certificate;

import li.klass.fhem.AndFHEMApplication;
import li.klass.fhem.util.ApplicationProperties;

import static li.klass.fhem.AndFHEMApplication.PREMIUM_PACKAGE;

@Singleton
public class LicenseService {
    @Inject
    BillingService billingService;

    @Inject
    ApplicationProperties applicationProperties;

    private static final Logger LOGGER = LoggerFactory.getLogger(LicenseService.class);

    private Context applicationContext = AndFHEMApplication.getContext();

    @Inject
    public LicenseService() {
    }

    public void isPremium(final IsPremiumListener listener) {
        billingService.loadInventory(new BillingService.OnLoadInventoryFinishedListener() {
            @Override
            public void onInventoryLoadFinished(boolean success) {
                boolean isPremium = isPremiumInternal(success);
                listener.isPremium(isPremium);
            }
        }, applicationContext);
    }

    private boolean isPremiumInternal(boolean loadSuccessful) {
        boolean isPremium = false;

        // careful: We need an application context here, as LicenseIntentService (this?!) is null
        // when invoking getPackageName!
        if (applicationProperties.getBooleanApplicationProperty("IS_PREMIUM")) {
            LOGGER.info("found IS_PREMIUM application property to be true => premium");
            isPremium = true;
        } else if (applicationContext.getPackageName().equals(PREMIUM_PACKAGE)) {
            LOGGER.info("found package name to be " + PREMIUM_PACKAGE + " => premium");
            isPremium = true;
        } else if (isDebug(applicationContext)) {
            LOGGER.info("running in debug => premium");
            isPremium = true;
        } else if (loadSuccessful && (billingService.contains(AndFHEMApplication.INAPP_PREMIUM_ID) ||
                billingService.contains(AndFHEMApplication.INAPP_PREMIUM_DONATOR_ID))) {
            LOGGER.info("found inapp premium purchase => premium");
            isPremium = true;
        } else {
            LOGGER.info("seems that I am not Premium...");
        }
        return isPremium;
    }

    public static boolean isDebug(Context context) {
        try {
            PackageInfo pkgInfo = context.getPackageManager()
                    .getPackageInfo(context.getPackageName(), PackageManager.GET_SIGNATURES);

            for (Signature appSignature : pkgInfo.signatures) {
                X509Certificate appCertificate = X509Certificate.getInstance(appSignature.toByteArray());
                if (appCertificate.getSubjectDN().getName().contains("Android Debug")) {
                    return true;
                }
            }
        } catch (Exception e) {
            LOGGER.error("isDebug() : some exception occurred while reading app signatures", e);
        }
        return false;
    }

    public interface IsPremiumListener {
        void isPremium(boolean isPremium);
    }
}