/*
 * Copyright (C) 2013 Open Whisper Systems
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.thoughtcrime.securesms;

import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Handler;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.lifecycle.DefaultLifecycleObserver;
import androidx.lifecycle.LifecycleOwner;
import androidx.lifecycle.ProcessLifecycleOwner;
import androidx.multidex.MultiDexApplication;

import org.conscrypt.Conscrypt;
import org.session.libsession.messaging.MessagingConfiguration;
import org.session.libsession.messaging.avatars.AvatarHelper;
import org.session.libsession.messaging.jobs.JobQueue;
import org.session.libsession.messaging.sending_receiving.notifications.MessageNotifier;
import org.session.libsession.messaging.sending_receiving.pollers.ClosedGroupPoller;
import org.session.libsession.messaging.sending_receiving.pollers.Poller;
import org.session.libsession.messaging.threads.Address;
import org.session.libsession.snode.SnodeConfiguration;
import org.session.libsession.utilities.IdentityKeyUtil;
import org.session.libsession.utilities.SSKEnvironment;
import org.session.libsession.utilities.TextSecurePreferences;
import org.session.libsession.utilities.Util;
import org.session.libsession.utilities.dynamiclanguage.DynamicLanguageContextWrapper;
import org.session.libsession.utilities.dynamiclanguage.LocaleParser;
import org.session.libsession.utilities.preferences.ProfileKeyUtil;
import org.session.libsignal.service.api.util.StreamDetails;
import org.session.libsignal.service.loki.api.PushNotificationAPI;
import org.session.libsignal.service.loki.api.SnodeAPI;
import org.session.libsignal.service.loki.api.SwarmAPI;
import org.session.libsignal.service.loki.api.fileserver.FileServerAPI;
import org.session.libsignal.service.loki.api.opengroups.PublicChatAPI;
import org.session.libsignal.service.loki.database.LokiAPIDatabaseProtocol;
import org.session.libsignal.service.loki.utilities.mentions.MentionsManager;
import org.session.libsignal.utilities.logging.Log;
import org.signal.aesgcmprovider.AesGcmProvider;
import org.thoughtcrime.securesms.components.TypingStatusSender;
import org.thoughtcrime.securesms.database.DatabaseFactory;
import org.thoughtcrime.securesms.database.GroupDatabase;
import org.thoughtcrime.securesms.dependencies.InjectableType;
import org.thoughtcrime.securesms.dependencies.SignalCommunicationModule;
import org.thoughtcrime.securesms.jobmanager.DependencyInjector;
import org.thoughtcrime.securesms.jobmanager.JobManager;
import org.thoughtcrime.securesms.jobmanager.impl.JsonDataSerializer;
import org.thoughtcrime.securesms.jobs.FastJobStorage;
import org.thoughtcrime.securesms.jobs.JobManagerFactories;
import org.thoughtcrime.securesms.logging.AndroidLogger;
import org.thoughtcrime.securesms.logging.PersistentLogger;
import org.thoughtcrime.securesms.logging.UncaughtExceptionLogger;
import org.thoughtcrime.securesms.loki.activities.HomeActivity;
import org.thoughtcrime.securesms.loki.api.BackgroundPollWorker;
import org.thoughtcrime.securesms.loki.api.LokiPushNotificationManager;
import org.thoughtcrime.securesms.loki.api.PublicChatManager;
import org.thoughtcrime.securesms.loki.api.SessionProtocolImpl;
import org.thoughtcrime.securesms.loki.database.LokiAPIDatabase;
import org.thoughtcrime.securesms.loki.database.LokiThreadDatabase;
import org.thoughtcrime.securesms.loki.database.LokiUserDatabase;
import org.thoughtcrime.securesms.loki.utilities.Broadcaster;
import org.thoughtcrime.securesms.loki.utilities.FcmUtils;
import org.thoughtcrime.securesms.loki.utilities.UiModeUtilities;
import org.thoughtcrime.securesms.notifications.DefaultMessageNotifier;
import org.thoughtcrime.securesms.notifications.NotificationChannels;
import org.thoughtcrime.securesms.notifications.OptimizedMessageNotifier;
import org.thoughtcrime.securesms.providers.BlobProvider;
import org.thoughtcrime.securesms.service.ExpiringMessageManager;
import org.thoughtcrime.securesms.service.KeyCachingService;
import org.thoughtcrime.securesms.service.LocalBackupListener;
import org.thoughtcrime.securesms.service.UpdateApkRefreshListener;
import org.thoughtcrime.securesms.sskenvironment.ProfileManager;
import org.thoughtcrime.securesms.sskenvironment.ReadReceiptManager;
import org.thoughtcrime.securesms.sskenvironment.TypingStatusRepository;
import org.thoughtcrime.securesms.util.dynamiclanguage.LocaleParseHelper;
import org.webrtc.PeerConnectionFactory;
import org.webrtc.PeerConnectionFactory.InitializationOptions;
import org.webrtc.voiceengine.WebRtcAudioManager;
import org.webrtc.voiceengine.WebRtcAudioUtils;

import java.io.File;
import java.io.FileInputStream;
import java.security.SecureRandom;
import java.security.Security;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;

import dagger.ObjectGraph;
import kotlin.Unit;
import kotlinx.coroutines.Job;
import network.loki.messenger.BuildConfig;

import static nl.komponents.kovenant.android.KovenantAndroid.startKovenant;
import static nl.komponents.kovenant.android.KovenantAndroid.stopKovenant;

/**
 * Will be called once when the TextSecure process is created.
 * <p>
 * We're using this as an insertion point to patch up the Android PRNG disaster,
 * to initialize the job manager, and to check for GCM registration freshness.
 *
 * @author Moxie Marlinspike
 */
public class ApplicationContext extends MultiDexApplication implements DependencyInjector, DefaultLifecycleObserver {

    public static final String PREFERENCES_NAME = "SecureSMS-Preferences";

    private static final String TAG = ApplicationContext.class.getSimpleName();

    private ExpiringMessageManager expiringMessageManager;
    private TypingStatusRepository typingStatusRepository;
    private TypingStatusSender typingStatusSender;
    private JobManager jobManager;
    private ReadReceiptManager readReceiptManager;
    private ProfileManager profileManager;
    private ObjectGraph objectGraph;
    private PersistentLogger persistentLogger;

    // Loki
    public MessageNotifier messageNotifier = null;
    public Poller poller = null;
    public ClosedGroupPoller closedGroupPoller = null;
    public PublicChatManager publicChatManager = null;
    private PublicChatAPI publicChatAPI = null;
    public Broadcaster broadcaster = null;
    public SignalCommunicationModule communicationModule;
    private Job firebaseInstanceIdJob;

    private volatile boolean isAppVisible;

    public static ApplicationContext getInstance(Context context) {
        return (ApplicationContext) context.getApplicationContext();
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Log.i(TAG, "onCreate()");
        startKovenant();
        initializeSecurityProvider();
        initializeLogging();
        initializeCrashHandling();
        initializeDependencyInjection();
        NotificationChannels.create(this);
        ProcessLifecycleOwner.get().getLifecycle().addObserver(this);
        // Loki
        // ========
        messageNotifier = new OptimizedMessageNotifier(new DefaultMessageNotifier());
        broadcaster = new Broadcaster(this);
        LokiAPIDatabase apiDB = DatabaseFactory.getLokiAPIDatabase(this);
        LokiThreadDatabase threadDB = DatabaseFactory.getLokiThreadDatabase(this);
        LokiUserDatabase userDB = DatabaseFactory.getLokiUserDatabase(this);
        String userPublicKey = TextSecurePreferences.getLocalNumber(this);
        MessagingConfiguration.Companion.configure(this,
                DatabaseFactory.getStorage(this),
                DatabaseFactory.getAttachmentProvider(this),
                new SessionProtocolImpl(this));
        SnodeConfiguration.Companion.configure(apiDB, broadcaster);
        if (userPublicKey != null) {
            SwarmAPI.Companion.configureIfNeeded(apiDB);
            SnodeAPI.Companion.configureIfNeeded(userPublicKey, apiDB, broadcaster);
            MentionsManager.Companion.configureIfNeeded(userPublicKey, threadDB, userDB);
        }
        PushNotificationAPI.Companion.configureIfNeeded(BuildConfig.DEBUG);
        setUpStorageAPIIfNeeded();
        resubmitProfilePictureIfNeeded();
        publicChatManager = new PublicChatManager(this);
        updateOpenGroupProfilePicturesIfNeeded();
        if (userPublicKey != null) {
            registerForFCMIfNeeded(false);
        }
        // Set application UI mode (day/night theme) to the user selected one.
        UiModeUtilities.setupUiModeToUserSelected(this);
        // ========
        initializeJobManager();
        initializeExpiringMessageManager();
        initializeTypingStatusRepository();
        initializeTypingStatusSender();
        initializeReadReceiptManager();
        initializeProfileManager();
        initializePeriodicTasks();
        initializeWebRtc();
        initializeBlobProvider();
        SSKEnvironment.Companion.configure(getTypingStatusRepository(), getReadReceiptManager(), getProfileManager(), messageNotifier, getExpiringMessageManager());
    }

    @Override
    public void onStart(@NonNull LifecycleOwner owner) {
        isAppVisible = true;
        Log.i(TAG, "App is now visible.");
        KeyCachingService.onAppForegrounded(this);
        // Loki
        if (poller != null) {
            poller.setCaughtUp(false);
        }
        startPollingIfNeeded();
        publicChatManager.markAllAsNotCaughtUp();
        publicChatManager.startPollersIfNeeded();
    }

    @Override
    public void onStop(@NonNull LifecycleOwner owner) {
        isAppVisible = false;
        Log.i(TAG, "App is no longer visible.");
        KeyCachingService.onAppBackgrounded(this);
        messageNotifier.setVisibleThread(-1);
        // Loki
        if (poller != null) {
            poller.stopIfNeeded();
        }
        if (closedGroupPoller != null) {
            closedGroupPoller.stopIfNeeded();
        }
        if (publicChatManager != null) {
            publicChatManager.stopPollers();
        }
    }

    @Override
    public void onTerminate() {
        stopKovenant(); // Loki
        super.onTerminate();
    }

    @Override
    public void injectDependencies(Object object) {
        if (object instanceof InjectableType) {
            objectGraph.inject(object);
        }
    }

    public void initializeLocaleParser() {
        LocaleParser.Companion.configure(new LocaleParseHelper());
    }

    public JobManager getJobManager() {
        return jobManager;
    }

    public ExpiringMessageManager getExpiringMessageManager() {
        return expiringMessageManager;
    }

    public TypingStatusRepository getTypingStatusRepository() {
        return typingStatusRepository;
    }

    public TypingStatusSender getTypingStatusSender() {
        return typingStatusSender;
    }

    public ReadReceiptManager getReadReceiptManager() {
        return readReceiptManager;
    }

    public ProfileManager getProfileManager() {
        return profileManager;
    }

    public boolean isAppVisible() {
        return isAppVisible;
    }

    public PersistentLogger getPersistentLogger() {
        return persistentLogger;
    }

    // Loki
    public @Nullable
    PublicChatAPI getPublicChatAPI() {
        if (publicChatAPI != null || !IdentityKeyUtil.hasIdentityKey(this)) {
            return publicChatAPI;
        }
        String userPublicKey = TextSecurePreferences.getLocalNumber(this);
        if (userPublicKey == null) {
            return publicChatAPI;
        }
        byte[] userPrivateKey = IdentityKeyUtil.getIdentityKeyPair(this).getPrivateKey().serialize();
        LokiAPIDatabase apiDB = DatabaseFactory.getLokiAPIDatabase(this);
        LokiUserDatabase userDB = DatabaseFactory.getLokiUserDatabase(this);
        GroupDatabase groupDB = DatabaseFactory.getGroupDatabase(this);
        publicChatAPI = new PublicChatAPI(userPublicKey, userPrivateKey, apiDB, userDB, groupDB);
        return publicChatAPI;
    }

    private void initializeSecurityProvider() {
        try {
            Class.forName("org.signal.aesgcmprovider.AesGcmCipher");
        } catch (ClassNotFoundException e) {
            Log.e(TAG, "Failed to find AesGcmCipher class");
            throw new ProviderInitializationException();
        }

        int aesPosition = Security.insertProviderAt(new AesGcmProvider(), 1);
        Log.i(TAG, "Installed AesGcmProvider: " + aesPosition);

        if (aesPosition < 0) {
            Log.e(TAG, "Failed to install AesGcmProvider()");
            throw new ProviderInitializationException();
        }

        int conscryptPosition = Security.insertProviderAt(Conscrypt.newProvider(), 2);
        Log.i(TAG, "Installed Conscrypt provider: " + conscryptPosition);

        if (conscryptPosition < 0) {
            Log.w(TAG, "Did not install Conscrypt provider. May already be present.");
        }
    }

    private void initializeLogging() {
        persistentLogger = new PersistentLogger(this);
        Log.initialize(new AndroidLogger(), persistentLogger);
    }

    private void initializeCrashHandling() {
        final Thread.UncaughtExceptionHandler originalHandler = Thread.getDefaultUncaughtExceptionHandler();
        Thread.setDefaultUncaughtExceptionHandler(new UncaughtExceptionLogger(originalHandler));
    }

    private void initializeJobManager() {
        this.jobManager = new JobManager(this, new JobManager.Configuration.Builder()
                .setDataSerializer(new JsonDataSerializer())
                .setJobFactories(JobManagerFactories.getJobFactories(this))
                .setConstraintFactories(JobManagerFactories.getConstraintFactories(this))
                .setConstraintObservers(JobManagerFactories.getConstraintObservers(this))
                .setJobStorage(new FastJobStorage(DatabaseFactory.getJobDatabase(this)))
                .setDependencyInjector(this)
                .build());
        JobQueue.getShared().resumePendingJobs();
    }

    private void initializeDependencyInjection() {
        communicationModule = new SignalCommunicationModule(this);
        this.objectGraph = ObjectGraph.create(communicationModule);
    }


    private void initializeExpiringMessageManager() {
        this.expiringMessageManager = new ExpiringMessageManager(this);
    }

    private void initializeTypingStatusRepository() {
        this.typingStatusRepository = new TypingStatusRepository();
    }

    private void initializeReadReceiptManager() {
        this.readReceiptManager = new ReadReceiptManager();
    }

    private void initializeProfileManager() {
        this.profileManager = new ProfileManager();
    }

    private void initializeTypingStatusSender() {
        this.typingStatusSender = new TypingStatusSender(this);
    }

    private void initializePeriodicTasks() {
        LocalBackupListener.schedule(this);
        BackgroundPollWorker.schedulePeriodic(this); // Loki

        if (BuildConfig.PLAY_STORE_DISABLED) {
            UpdateApkRefreshListener.schedule(this);
        }
    }

    private void initializeWebRtc() {
        try {
            Set<String> HARDWARE_AEC_BLACKLIST = new HashSet<String>() {{
                add("Pixel");
                add("Pixel XL");
                add("Moto G5");
                add("Moto G (5S) Plus");
                add("Moto G4");
                add("TA-1053");
                add("Mi A1");
                add("E5823"); // Sony z5 compact
                add("Redmi Note 5");
                add("FP2"); // Fairphone FP2
                add("MI 5");
            }};

            Set<String> OPEN_SL_ES_WHITELIST = new HashSet<String>() {{
                add("Pixel");
                add("Pixel XL");
            }};

            if (HARDWARE_AEC_BLACKLIST.contains(Build.MODEL)) {
                WebRtcAudioUtils.setWebRtcBasedAcousticEchoCanceler(true);
            }

            if (!OPEN_SL_ES_WHITELIST.contains(Build.MODEL)) {
                WebRtcAudioManager.setBlacklistDeviceForOpenSLESUsage(true);
            }

            PeerConnectionFactory.initialize(InitializationOptions.builder(this).createInitializationOptions());
        } catch (UnsatisfiedLinkError e) {
            Log.w(TAG, e);
        }
    }

    private void initializeBlobProvider() {
        AsyncTask.THREAD_POOL_EXECUTOR.execute(() -> {
            BlobProvider.getInstance().onSessionStart(this);
        });
    }

    @Override
    protected void attachBaseContext(Context base) {
        initializeLocaleParser();
        super.attachBaseContext(DynamicLanguageContextWrapper.updateContext(base, TextSecurePreferences.getLanguage(base)));
    }

    private static class ProviderInitializationException extends RuntimeException {
    }

    // region Loki
    public boolean setUpStorageAPIIfNeeded() {
        String userPublicKey = TextSecurePreferences.getLocalNumber(this);
        if (userPublicKey == null || !IdentityKeyUtil.hasIdentityKey(this)) {
            return false;
        }
        byte[] userPrivateKey = IdentityKeyUtil.getIdentityKeyPair(this).getPrivateKey().serialize();
        LokiAPIDatabaseProtocol apiDB = DatabaseFactory.getLokiAPIDatabase(this);
        FileServerAPI.Companion.configure(userPublicKey, userPrivateKey, apiDB);
        org.session.libsession.messaging.fileserver.FileServerAPI.Companion.configure(userPublicKey, userPrivateKey, apiDB);
        return true;
    }

    public void registerForFCMIfNeeded(final Boolean force) {
        if (firebaseInstanceIdJob != null && firebaseInstanceIdJob.isActive() && !force) return;
        if (force && firebaseInstanceIdJob != null) {
            firebaseInstanceIdJob.cancel(null);
        }
        firebaseInstanceIdJob = FcmUtils.getFcmInstanceId(task->{
            if (!task.isSuccessful()) {
                Log.w("Loki", "FirebaseInstanceId.getInstance().getInstanceId() failed." + task.getException());
                return Unit.INSTANCE;
            }
            String token = task.getResult().getToken();
            String userPublicKey = TextSecurePreferences.getLocalNumber(this);
            if (userPublicKey == null) return Unit.INSTANCE;
            if (TextSecurePreferences.isUsingFCM(this)) {
                LokiPushNotificationManager.register(token, userPublicKey, this, force);
            } else {
                LokiPushNotificationManager.unregister(token, this);
            }
            return Unit.INSTANCE;
        });
    }

    private void setUpPollingIfNeeded() {
        String userPublicKey = TextSecurePreferences.getLocalNumber(this);
        if (userPublicKey == null) return;
        if (poller != null) {
            SnodeAPI.shared.setUserPublicKey(userPublicKey);
            poller.setUserPublicKey(userPublicKey);
            return;
        }
        LokiAPIDatabase apiDB = DatabaseFactory.getLokiAPIDatabase(this);
        SwarmAPI.Companion.configureIfNeeded(apiDB);
        SnodeAPI.Companion.configureIfNeeded(userPublicKey, apiDB, broadcaster);
        poller = new Poller();
        closedGroupPoller = new ClosedGroupPoller();
    }

    public void startPollingIfNeeded() {
        setUpPollingIfNeeded();
        if (poller != null) {
            poller.startIfNeeded();
        }
        if (closedGroupPoller != null) {
            closedGroupPoller.startIfNeeded();
        }
    }

    public void stopPolling() {
        if (poller != null) {
            poller.stopIfNeeded();
        }
        if (closedGroupPoller != null) {
            closedGroupPoller.stopIfNeeded();
        }
        if (publicChatManager != null) {
            publicChatManager.stopPollers();
        }
    }

    private void resubmitProfilePictureIfNeeded() {
        String userPublicKey = TextSecurePreferences.getLocalNumber(this);
        if (userPublicKey == null) return;
        long now = new Date().getTime();
        long lastProfilePictureUpload = TextSecurePreferences.getLastProfilePictureUpload(this);
        if (now - lastProfilePictureUpload <= 14 * 24 * 60 * 60 * 1000) return;
        AsyncTask.execute(() -> {
            String encodedProfileKey = ProfileKeyUtil.generateEncodedProfileKey(this);
            byte[] profileKey = ProfileKeyUtil.getProfileKeyFromEncodedString(encodedProfileKey);
            try {
                File profilePicture = AvatarHelper.getAvatarFile(this, Address.fromSerialized(userPublicKey));
                StreamDetails stream = new StreamDetails(new FileInputStream(profilePicture), "image/jpeg", profilePicture.length());
                FileServerAPI.shared.uploadProfilePicture(FileServerAPI.shared.getServer(), profileKey, stream, () -> {
                    TextSecurePreferences.setLastProfilePictureUpload(this, new Date().getTime());
                    TextSecurePreferences.setProfileAvatarId(this, new SecureRandom().nextInt());
                    ProfileKeyUtil.setEncodedProfileKey(this, encodedProfileKey);
                    return Unit.INSTANCE;
                });
            } catch (Exception exception) {
                // Do nothing
            }
        });
    }

    public void updateOpenGroupProfilePicturesIfNeeded() {
        AsyncTask.execute(() -> {
            PublicChatAPI publicChatAPI = null;
            try {
                publicChatAPI = getPublicChatAPI();
            } catch (Exception e) {
                // Do nothing
            }
            if (publicChatAPI == null) {
                return;
            }
            byte[] profileKey = ProfileKeyUtil.getProfileKey(this);
            String url = TextSecurePreferences.getProfilePictureURL(this);
            Set<String> servers = DatabaseFactory.getLokiThreadDatabase(this).getAllPublicChatServers();
            for (String server : servers) {
                if (profileKey != null) {
                    publicChatAPI.setProfilePicture(server, profileKey, url);
                }
            }
        });
    }

    public void clearAllData(boolean isMigratingToV2KeyPair) {
        String token = TextSecurePreferences.getFCMToken(this);
        if (token != null && !token.isEmpty()) {
            LokiPushNotificationManager.unregister(token, this);
        }
        if (firebaseInstanceIdJob != null && firebaseInstanceIdJob.isActive()) {
            firebaseInstanceIdJob.cancel(null);
        }
        String displayName = TextSecurePreferences.getProfileName(this);
        boolean isUsingFCM = TextSecurePreferences.isUsingFCM(this);
        TextSecurePreferences.clearAll(this);
        if (isMigratingToV2KeyPair) {
            TextSecurePreferences.setIsMigratingKeyPair(this, true);
            TextSecurePreferences.setIsUsingFCM(this, isUsingFCM);
            TextSecurePreferences.setProfileName(this, displayName);
        }
        getSharedPreferences(PREFERENCES_NAME, 0).edit().clear().commit();
        if (!deleteDatabase("signal.db")) {
            Log.d("Loki", "Failed to delete database.");
        }
        Util.runOnMain(() -> new Handler().postDelayed(ApplicationContext.this::restartApplication, 200));
    }

    public void restartApplication() {
        Intent intent = new Intent(this, HomeActivity.class);
        startActivity(Intent.makeRestartActivityTask(intent.getComponent()));
        Runtime.getRuntime().exit(0);
    }

    // endregion
}