/*
 * Jitsi, the OpenSource Java VoIP and Instant Messaging client.
 *
 * Copyright @ 2015 Atlassian Pty Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.java.sip.communicator.impl.certificate;

import net.java.sip.communicator.service.certificate.*;
import net.java.sip.communicator.service.credentialsstorage.*;
import net.java.sip.communicator.service.gui.*;
import net.java.sip.communicator.util.*;

import org.jitsi.service.configuration.*;
import org.jitsi.service.resources.*;
import org.osgi.framework.*;

/**
 * The certificate verification bundle activator.
 *
 * @author Yana Stamcheva
 */
public class CertificateVerificationActivator
    implements BundleActivator
{
    /**
     * The bundle context for this bundle.
     */
    protected static BundleContext bundleContext;

    /**
     * The configuration service.
     */
    private static ConfigurationService configService;

    /**
     * The service giving access to all resources.
     */
    private static ResourceManagementService resourcesService;

    /**
     * The service to store and access passwords.
     */
    private static CredentialsStorageService credService;

    /**
     * The service to create and show dialogs for user interaction.
     */
    private static VerifyCertificateDialogService certificateDialogService;

    /**
     * Called when this bundle is started.
     *
     * @param bc The execution context of the bundle being started.
     * @throws Exception if the bundle is not correctly started
     */
    public void start(BundleContext bc) throws Exception
    {
        bundleContext = bc;

        bundleContext.registerService(
            CertificateService.class.getName(),
            new CertificateServiceImpl(),
            null);
    }

    /**
     * Called when this bundle is stopped so the Framework can perform the
     * bundle-specific activities necessary to stop the bundle.
     *
     * @param bc The execution context of the bundle being stopped.
     * @throws Exception If this method throws an exception, the bundle is
     *   still marked as stopped, and the Framework will remove the bundle's
     *   listeners, unregister all services registered by the bundle, and
     *   release all services used by the bundle.
     */
    public void stop(BundleContext bc) throws Exception
    {
        configService = null;
        resourcesService = null;
        credService = null;
        certificateDialogService = null;
    }

    /**
     * Returns the <tt>ConfigurationService</tt> obtained from the bundle
     * context.
     * @return the <tt>ConfigurationService</tt> obtained from the bundle
     * context
     */
    public static ConfigurationService getConfigurationService()
    {
        if(configService == null)
        {
            configService
                = ServiceUtils.getService(
                        bundleContext,
                        ConfigurationService.class);
        }
        return configService;
    }

    /**
     * Returns the <tt>ResourceManagementService</tt>, through which we will
     * access all resources.
     *
     * @return the <tt>ResourceManagementService</tt>, through which we will
     * access all resources.
     */
    public static ResourceManagementService getResources()
    {
        if (resourcesService == null)
        {
            resourcesService
                = ServiceUtils.getService(
                        bundleContext,
                        ResourceManagementService.class);
        }
        return resourcesService;
    }

    /**
     * Returns the <tt>CredentialsStorageService</tt>, through which we will
     * access all passwords.
     *
     * @return the <tt>CredentialsStorageService</tt>, through which we will
     * access all passwords.
     */
    public static CredentialsStorageService getCredService()
    {
        if (credService == null)
        {
            credService
                = ServiceUtils.getService(
                        bundleContext,
                        CredentialsStorageService.class);
        }
        return credService;
    }

    /**
     * Returns the <tt>VerifyCertificateDialogService</tt>, through which we
     * will use to create dialogs.
     *
     * @return the <tt>VerifyCertificateDialogService</tt>, through which we
     * will use to create dialogs.
     */
    public static VerifyCertificateDialogService getCertificateDialogService()
    {
        if (certificateDialogService == null)
        {
            certificateDialogService
                = ServiceUtils.getService(
                    bundleContext,
                    VerifyCertificateDialogService.class);
        }
        return certificateDialogService;
    }

    /**
     * Returns service to show authentication window.
     * @return return service to show authentication window.
     */
    public static AuthenticationWindowService getAuthenticationWindowService()
    {
        return ServiceUtils.getService(
            bundleContext, AuthenticationWindowService.class);
    }
}