/*
 * 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.plugin.securityconfig;

import java.util.*;

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

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

/**
 * @author Yana Stamcheva
 * @author Dmitri Melnikov
 */
public class SecurityConfigActivator
    implements BundleActivator
{
    /**
     * The {@link BundleContext} of the {@link SecurityConfigActivator}.
     */
    public static BundleContext bundleContext;

    /**
     * The {@link ResourceManagementService} of the
     * {@link SecurityConfigActivator}. Can also be obtained from the
     * {@link SecurityConfigActivator#bundleContext} on demand, but we add it
     * here for convenience.
     */
    private static ResourceManagementService resources;

    /**
     * The <tt>ConfigurationService</tt> registered in {@link #bundleContext}
     * and used by the <tt>SecurityConfigActivator</tt> instance to read and
     * write configuration properties.
     */
    private static ConfigurationService configurationService;

    /**
     * The <tt>CredentialsStorageService</tt> registered in
     * {@link #bundleContext}.
     */
    private static CredentialsStorageService credentialsStorageService;

    /**
     * The <tt>UIService</tt> registered in {@link #bundleContext}.
     */
    private static UIService uiService;

    /**
     * Indicates if the security configuration form should be disabled, i.e.
     * not visible to the user.
     */
    private static final String DISABLED_PROP
        = "net.java.sip.communicator.plugin.securityconfig.DISABLED";

    /**
     * Indicates if the master password config form should be disabled, i.e.
     * not visible to the user.
     */
    private static final String MASTER_PASSWORD_DISABLED_PROP
        = "net.java.sip.communicator.plugin.securityconfig.masterpasswordconfig.DISABLED";

    /**
     * Starts this plugin.
     * @param bc the BundleContext
     * @throws Exception if some of the operations executed in the start method
     * fails
     */
    public void start(BundleContext bc) throws Exception
    {
        bundleContext = bc;

        ConfigurationService cfg = getConfigurationService();

        // If the security configuration form is disabled don't continue.
        if (cfg.getBoolean(DISABLED_PROP, false))
            return;

        // Register the configuration form.
        Dictionary<String, String> properties;

        properties = new Hashtable<String, String>();
        properties.put( ConfigurationForm.FORM_TYPE,
                        ConfigurationForm.GENERAL_TYPE);
        bundleContext.registerService(
            ConfigurationForm.class.getName(),
            new LazyConfigurationForm(
                "net.java.sip.communicator.plugin.securityconfig.SecurityConfigurationPanel",
                getClass().getClassLoader(),
                "plugin.securityconfig.ICON",
                "plugin.securityconfig.TITLE",
                20),
            properties);

        // If the master password config form is disabled don't register it.
        if(!cfg.getBoolean(MASTER_PASSWORD_DISABLED_PROP, false))
        {
            properties = new Hashtable<String, String>();
            properties.put( ConfigurationForm.FORM_TYPE,
                            ConfigurationForm.SECURITY_TYPE);
            bundleContext.registerService(
                ConfigurationForm.class.getName(),
                new LazyConfigurationForm(
                    "net.java.sip.communicator.plugin.securityconfig.masterpassword.ConfigurationPanel",
                    getClass().getClassLoader(),
                    null /* iconID */,
                    "plugin.securityconfig.masterpassword.TITLE",
                    3),
                properties);
        }
    }

    /**
     * Invoked when this bundle is stopped.
     * @param bc the BundleContext
     * @throws Exception if some of the operations executed in the start method
     * fails
     */
    public void stop(BundleContext bc) throws Exception {}

    /**
     * Returns a reference to the ResourceManagementService implementation
     * currently registered in the bundle context or null if no such
     * implementation was found.
     *
     * @return a currently valid implementation of the ResourceManagementService
     */
    public static ResourceManagementService getResources()
    {
        if (resources == null)
        {
            resources
                = ResourceManagementServiceUtils.getService(bundleContext);
        }
        return resources;
    }

    /**
     * Returns a reference to the ConfigurationService implementation currently
     * registered in the bundle context or null if no such implementation was
     * found.
     *
     * @return a currently valid implementation of the ConfigurationService.
     */
    public static ConfigurationService getConfigurationService()
    {
        if (configurationService == null)
        {
            configurationService
                = ServiceUtils.getService(
                        bundleContext,
                        ConfigurationService.class);
        }
        return configurationService;
    }

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

    /**
     * Gets the <tt>UIService</tt> instance registered in the
     * <tt>BundleContext</tt> of the <tt>SecurityConfigActivator</tt>.
     *
     * @return the <tt>UIService</tt> instance registered in the
     * <tt>BundleContext</tt> of the <tt>SecurityConfigActivator</tt>
     */
    public static UIService getUIService()
    {
        if (uiService == null)
            uiService = ServiceUtils.getService(bundleContext, UIService.class);
        return uiService;
    }

    /**
     * Gets all the available accounts in SIP Communicator.
     *
     * @return a {@link List} of {@link AccountID}.
     */
    public static List<AccountID> getAllAccountIDs()
    {
        Map<Object, ProtocolProviderFactory> providerFactoriesMap
            = getProtocolProviderFactories();

        if (providerFactoriesMap == null)
            return null;

        List<AccountID> accountIDs = new Vector<AccountID>();
        for (ProtocolProviderFactory providerFactory : providerFactoriesMap
            .values())
        {
            for (AccountID accountID : providerFactory.getRegisteredAccounts())
            {
                accountIDs.add(accountID);
            }
        }

        return accountIDs;
    }

    /**
     * Returns a <tt>Map</tt> of <ProtocolName, ProtocolProviderFactory> pairs.
     * @return a <tt>Map</tt> of <ProtocolName, ProtocolProviderFactory> pairs
     */
    private static Map<Object, ProtocolProviderFactory>
        getProtocolProviderFactories()
    {
        Collection<ServiceReference<ProtocolProviderFactory>> serRefs
            = ServiceUtils.getServiceReferences(
                    bundleContext,
                    ProtocolProviderFactory.class);
        Map<Object, ProtocolProviderFactory> providerFactoriesMap
            = new Hashtable<Object, ProtocolProviderFactory>();

        if ((serRefs != null) && !serRefs.isEmpty())
        {
            for (ServiceReference<ProtocolProviderFactory> serRef : serRefs)
            {
                ProtocolProviderFactory providerFactory
                    = bundleContext.getService(serRef);

                providerFactoriesMap.put(
                        serRef.getProperty(ProtocolProviderFactory.PROTOCOL),
                        providerFactory);
            }
        }
        return providerFactoriesMap;
    }

    /**
     * Finds all accounts with saved encrypted passwords.
     *
     * @return a {@link List} of {@link AccountID} with the saved encrypted
     * password.
     */
    public static Map<AccountID, String> getAccountIDsWithSavedPasswords()
    {
        Map<?, ProtocolProviderFactory> providerFactoriesMap
            = getProtocolProviderFactories();

        if (providerFactoriesMap == null)
            return null;

        CredentialsStorageService credentialsStorageService
            = getCredentialsStorageService();
        Map<AccountID, String> accountIDs = new HashMap<AccountID, String>();

        for (ProtocolProviderFactory providerFactory
                : providerFactoriesMap.values())
        {
            String sourcePackageName
                = getFactoryImplPackageName(providerFactory);
            for (AccountID accountID : providerFactory.getRegisteredAccounts())
            {
                String accountPrefix
                    = ProtocolProviderFactory.findAccountPrefix(
                            bundleContext,
                            accountID,
                            sourcePackageName);
                if (credentialsStorageService.isStoredEncrypted(accountPrefix))
                    accountIDs.put(accountID, accountPrefix);
            }
        }
        return accountIDs;
    }

    /**
     * Finds all chat rooms with saved encrypted passwords.
     *
     * @return a {@link List} with the saved encrypted
     * password.
     */
    public static Map<String, String> getChatRoomsWithSavedPasswords()
    {
        Map<?, ProtocolProviderFactory> providerFactoriesMap
        = getProtocolProviderFactories();

        if (providerFactoriesMap == null)
            return null;

        CredentialsStorageService credentialsStorageService
            = getCredentialsStorageService();
        
        Map<String, String> chatRoomIDs = new HashMap<String, String>();
        String prefix = "net.java.sip.communicator.impl.gui.accounts";
        List<String> accounts = getConfigurationService()
            .getPropertyNamesByPrefix(prefix, true);
       
        for (ProtocolProviderFactory providerFactory
            : providerFactoriesMap.values())
        {
            for (AccountID accountID : providerFactory.getRegisteredAccounts())
            {
                for (String accountRootPropName : accounts)
                {
                    String accountName
                    = getConfigurationService().getString(accountRootPropName);
                    
                    if(!accountID.getAccountUniqueID().equals(accountName))
                        continue;
                    
                    List<String> chatRooms = getConfigurationService()
                        .getPropertyNamesByPrefix(
                            accountRootPropName + ".chatRooms", true);
        
                    for (String chatRoomPropName : chatRooms)
                    {
                        String chatRoomName = getConfigurationService()
                            .getString(chatRoomPropName);
                        if (credentialsStorageService.isStoredEncrypted(
                                    chatRoomPropName + ".password"))
                            chatRoomIDs.put(chatRoomName + " " + resources
                                .getI18NString("service.gui.VIA") + " "
                                + accountID.getUserID(), chatRoomPropName 
                                + ".password");
                    }
                }
            }
        }
        return chatRoomIDs;
    }
    
    /**
     * @return a String containing the package name of the concrete factory
     * class that extends the abstract factory.
     */
    private static String getFactoryImplPackageName(
            ProtocolProviderFactory providerFactory)
    {
        String className = providerFactory.getClass().getName();
        return className.substring(0, className.lastIndexOf('.'));
    }

    /**
     * Returns service to show master password input dialog.
     * @return return master password service to display input dialog.
     */
    public static MasterPasswordInputService getMasterPasswordInputService()
    {
        return ServiceUtils.getService(
            bundleContext, MasterPasswordInputService.class);
    }
}