package eu.faircode.email;

/*
    This file is part of FairEmail.

    FairEmail 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.

    FairEmail 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 FairEmail.  If not, see <http://www.gnu.org/licenses/>.

    Copyright 2018-2020 by Marcel Bokhorst (M66B)
*/

import android.accounts.Account;
import android.accounts.AccountManager;
import android.app.Dialog;
import android.app.NotificationChannel;
import android.app.NotificationChannelGroup;
import android.app.NotificationManager;
import android.content.BroadcastReceiver;
import android.content.ContentResolver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.ActionBarDrawerToggle;
import androidx.appcompat.app.AlertDialog;
import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.core.view.GravityCompat;
import androidx.documentfile.provider.DocumentFile;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import androidx.lifecycle.Lifecycle;
import androidx.lifecycle.Observer;
import androidx.localbroadcastmanager.content.LocalBroadcastManager;
import androidx.preference.PreferenceManager;
import androidx.recyclerview.widget.DividerItemDecoration;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.google.android.material.textfield.TextInputLayout;

import org.bouncycastle.util.io.pem.PemObject;
import org.bouncycastle.util.io.pem.PemReader;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.security.SecureRandom;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.security.spec.KeySpec;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;

import static eu.faircode.email.ServiceAuthenticator.AUTH_TYPE_GMAIL;
import static eu.faircode.email.ServiceAuthenticator.TYPE_GOOGLE;

public class ActivitySetup extends ActivityBase implements FragmentManager.OnBackStackChangedListener {
    private View view;
    private DrawerLayout drawerLayout;
    private ActionBarDrawerToggle drawerToggle;
    private ConstraintLayout drawerContainer;
    private RecyclerView rvMenu;

    private boolean hasAccount;
    private String password;

    private static final int KEY_ITERATIONS = 65536;
    private static final int KEY_LENGTH = 256;

    static final int REQUEST_PERMISSION = 1;
    static final int REQUEST_SOUND = 2;
    static final int REQUEST_EXPORT = 3;
    static final int REQUEST_IMPORT = 4;
    static final int REQUEST_CHOOSE_ACCOUNT = 5;
    static final int REQUEST_DONE = 6;
    static final int REQUEST_IMPORT_CERTIFICATE = 7;
    static final int REQUEST_OAUTH = 8;
    static final int REQUEST_STILL = 9;

    static final String ACTION_QUICK_GMAIL = BuildConfig.APPLICATION_ID + ".ACTION_QUICK_GMAIL";
    static final String ACTION_QUICK_OAUTH = BuildConfig.APPLICATION_ID + ".ACTION_QUICK_OAUTH";
    static final String ACTION_QUICK_SETUP = BuildConfig.APPLICATION_ID + ".ACTION_QUICK_SETUP";
    static final String ACTION_VIEW_ACCOUNTS = BuildConfig.APPLICATION_ID + ".ACTION_VIEW_ACCOUNTS";
    static final String ACTION_VIEW_IDENTITIES = BuildConfig.APPLICATION_ID + ".ACTION_VIEW_IDENTITIES";
    static final String ACTION_EDIT_ACCOUNT = BuildConfig.APPLICATION_ID + ".EDIT_ACCOUNT";
    static final String ACTION_EDIT_IDENTITY = BuildConfig.APPLICATION_ID + ".EDIT_IDENTITY";
    static final String ACTION_MANAGE_LOCAL_CONTACTS = BuildConfig.APPLICATION_ID + ".MANAGE_LOCAL_CONTACTS";
    static final String ACTION_MANAGE_CERTIFICATES = BuildConfig.APPLICATION_ID + ".MANAGE_CERTIFICATES";
    static final String ACTION_IMPORT_CERTIFICATE = BuildConfig.APPLICATION_ID + ".IMPORT_CERTIFICATE";
    static final String ACTION_SETUP_ADVANCED = BuildConfig.APPLICATION_ID + ".SETUP_ADVANCED";
    static final String ACTION_SETUP_MORE = BuildConfig.APPLICATION_ID + ".SETUP_MORE";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        view = LayoutInflater.from(this).inflate(R.layout.activity_setup, null);
        setContentView(view);

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        drawerLayout = findViewById(R.id.drawer_layout);
        drawerLayout.setScrimColor(Helper.resolveColor(this, R.attr.colorDrawerScrim));

        drawerToggle = new ActionBarDrawerToggle(this, drawerLayout, R.string.app_name, R.string.app_name) {
            public void onDrawerClosed(View view) {
                super.onDrawerClosed(view);
            }

            public void onDrawerOpened(View drawerView) {
                super.onDrawerOpened(drawerView);
            }
        };
        drawerLayout.addDrawerListener(drawerToggle);

        drawerContainer = findViewById(R.id.drawer_container);
        rvMenu = drawerContainer.findViewById(R.id.rvMenu);
        LinearLayoutManager llm = new LinearLayoutManager(this);
        rvMenu.setLayoutManager(llm);
        final AdapterNavMenu adapter = new AdapterNavMenu(this, this);
        rvMenu.setAdapter(adapter);

        final Drawable d = getDrawable(R.drawable.divider);
        DividerItemDecoration itemDecorator = new DividerItemDecoration(this, llm.getOrientation()) {
            @Override
            public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
                int pos = parent.getChildAdapterPosition(view);
                NavMenuItem menu = adapter.get(pos);
                outRect.set(0, 0, 0, menu != null && menu.isSeparated() ? d.getIntrinsicHeight() : 0);
            }
        };
        itemDecorator.setDrawable(d);
        rvMenu.addItemDecoration(itemDecorator);

        final List<NavMenuItem> menus = new ArrayList<>();

        menus.add(new NavMenuItem(R.drawable.twotone_exit_to_app_24, R.string.menu_exit, new Runnable() {
            @Override
            public void run() {
                drawerLayout.closeDrawer(drawerContainer, false);
                onBackPressed();
            }
        }).setSeparated());

        menus.add(new NavMenuItem(R.drawable.twotone_archive_24, R.string.title_setup_export, new Runnable() {
            @Override
            public void run() {
                drawerLayout.closeDrawer(drawerContainer);
                onMenuExport();
            }
        }));

        menus.add(new NavMenuItem(R.drawable.twotone_unarchive_24, R.string.title_setup_import, new Runnable() {
            @Override
            public void run() {
                drawerLayout.closeDrawer(drawerContainer);
                onMenuImport();
            }
        }).setSeparated());

        menus.add(new NavMenuItem(R.drawable.twotone_reorder_24, R.string.title_setup_reorder_accounts, new Runnable() {
            @Override
            public void run() {
                drawerLayout.closeDrawer(drawerContainer);
                onMenuOrder(R.string.title_setup_reorder_accounts, EntityAccount.class);
            }
        }));

        menus.add(new NavMenuItem(R.drawable.twotone_reorder_24, R.string.title_setup_reorder_folders, new Runnable() {
            @Override
            public void run() {
                drawerLayout.closeDrawer(drawerContainer);
                onMenuOrder(R.string.title_setup_reorder_folders, TupleFolderSort.class);
            }
        }).setSeparated());

        menus.add(new NavMenuItem(R.drawable.twotone_help_24, R.string.menu_legend, new Runnable() {
            @Override
            public void run() {
                drawerLayout.closeDrawer(drawerContainer);
                onMenuLegend();
            }
        }));

        menus.add(new NavMenuItem(R.drawable.twotone_question_answer_24, R.string.menu_faq, new Runnable() {
            @Override
            public void run() {
                drawerLayout.closeDrawer(drawerContainer);
                onMenuFAQ();
            }
        }, new Runnable() {
            @Override
            public void run() {
                drawerLayout.closeDrawer(drawerContainer);
                onDebugInfo();
            }
        }).setExternal(true));

        menus.add(new NavMenuItem(R.drawable.twotone_account_box_24, R.string.menu_privacy, new Runnable() {
            @Override
            public void run() {
                drawerLayout.closeDrawer(drawerContainer);
                onMenuPrivacy();
            }
        }));

        menus.add(new NavMenuItem(R.drawable.twotone_info_24, R.string.menu_about, new Runnable() {
            @Override
            public void run() {
                drawerLayout.closeDrawer(drawerContainer);
                onMenuAbout();
            }
        }));

        adapter.set(menus);

        getSupportFragmentManager().addOnBackStackChangedListener(this);

        if (getSupportFragmentManager().getFragments().size() == 0) {
            Intent intent = getIntent();
            String target = intent.getStringExtra("target");

            FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
            if ("accounts".equals(target))
                fragmentTransaction.replace(R.id.content_frame, new FragmentAccounts()).addToBackStack("accounts");
            else
                fragmentTransaction.replace(R.id.content_frame, new FragmentOptions()).addToBackStack("options");
            fragmentTransaction.commit();

            if (intent.hasExtra("target")) {
                intent.removeExtra("target");
                setIntent(intent);
            }
        }

        if (savedInstanceState != null)
            drawerToggle.setDrawerIndicatorEnabled(savedInstanceState.getBoolean("fair:toggle"));

        DB.getInstance(this).account().liveSynchronizingAccounts().observe(this, new Observer<List<EntityAccount>>() {
            @Override
            public void onChanged(List<EntityAccount> accounts) {
                hasAccount = (accounts != null && accounts.size() > 0);
            }
        });
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        outState.putBoolean("fair:toggle", drawerToggle.isDrawerIndicatorEnabled());
        super.onSaveInstanceState(outState);
    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        drawerToggle.syncState();

        Intent intent = getIntent();
        boolean navigate = intent.hasExtra("navigate");
        if (navigate) {
            intent.removeExtra("navigate");
            setIntent(intent);
            onSetupMore(intent);
        }
    }

    @Override
    protected void onResume() {
        super.onResume();

        LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(this);
        IntentFilter iff = new IntentFilter();
        iff.addAction(ACTION_QUICK_GMAIL);
        iff.addAction(ACTION_QUICK_OAUTH);
        iff.addAction(ACTION_QUICK_SETUP);
        iff.addAction(ACTION_VIEW_ACCOUNTS);
        iff.addAction(ACTION_VIEW_IDENTITIES);
        iff.addAction(ACTION_EDIT_ACCOUNT);
        iff.addAction(ACTION_EDIT_IDENTITY);
        iff.addAction(ACTION_MANAGE_LOCAL_CONTACTS);
        iff.addAction(ACTION_MANAGE_CERTIFICATES);
        iff.addAction(ACTION_IMPORT_CERTIFICATE);
        iff.addAction(ACTION_SETUP_ADVANCED);
        iff.addAction(ACTION_SETUP_MORE);
        lbm.registerReceiver(receiver, iff);
    }

    @Override
    protected void onPause() {
        super.onPause();
        LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(this);
        lbm.unregisterReceiver(receiver);
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        drawerToggle.onConfigurationChanged(newConfig);
    }

    @Override
    public void onBackPressed() {
        if (drawerLayout.isDrawerOpen(drawerContainer))
            drawerLayout.closeDrawer(drawerContainer);
        else
            super.onBackPressed();
    }

    @Override
    public void onBackStackChanged() {
        int count = getSupportFragmentManager().getBackStackEntryCount();
        if (count == 0) {
            if (hasAccount)
                startActivity(new Intent(this, ActivityView.class));
            finish();
        } else {
            if (drawerLayout.isDrawerOpen(drawerContainer))
                drawerLayout.closeDrawer(drawerContainer);
            drawerToggle.setDrawerIndicatorEnabled(count == 1);
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (drawerToggle.onOptionsItemSelected(item))
            return true;

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        try {
            switch (requestCode) {
                case REQUEST_EXPORT:
                    if (resultCode == RESULT_OK && data != null)
                        handleExport(data, this.password);
                    break;
                case REQUEST_IMPORT:
                    if (resultCode == RESULT_OK && data != null)
                        handleImport(data, this.password);
                    break;
                case REQUEST_IMPORT_CERTIFICATE:
                    if (resultCode == RESULT_OK && data != null)
                        handleImportCertificate(data);
                    break;
            }
        } catch (Throwable ex) {
            Log.e(ex);
        }
    }

    private void onMenuExport() {
        if (ActivityBilling.isPro(this))
            askPassword(true);
        else
            startActivity(new Intent(this, ActivityBilling.class));
    }

    private void onMenuImport() {
        askPassword(false);
    }

    private void askPassword(final boolean export) {
        Intent intent = (export ? getIntentExport() : getIntentImport());
        if (intent.resolveActivity(getPackageManager()) == null) { //  // system/GET_CONTENT whitelisted
            ToastEx.makeText(this, R.string.title_no_saf, Toast.LENGTH_LONG).show();
            return;
        }

        try {
            Bundle args = new Bundle();
            args.putBoolean("export", export);

            FragmentDialogPassword fragment = new FragmentDialogPassword();
            fragment.setArguments(args);
            fragment.show(getSupportFragmentManager(), "password");
        } catch (Throwable ex) {
            Log.unexpectedError(getSupportFragmentManager(), ex);
        }
    }

    private void onMenuOrder(int title, Class clazz) {
        if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.STARTED))
            getSupportFragmentManager().popBackStack("order", FragmentManager.POP_BACK_STACK_INCLUSIVE);

        Bundle args = new Bundle();
        args.putInt("title", title);
        args.putString("class", clazz.getName());

        FragmentOrder fragment = new FragmentOrder();
        fragment.setArguments(args);

        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(R.id.content_frame, fragment).addToBackStack("order");
        fragmentTransaction.commit();
    }

    private void onMenuLegend() {
        if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.STARTED))
            getSupportFragmentManager().popBackStack("legend", FragmentManager.POP_BACK_STACK_INCLUSIVE);

        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(R.id.content_frame, new FragmentLegend()).addToBackStack("legend");
        fragmentTransaction.commit();
    }

    private void onMenuFAQ() {
        Helper.viewFAQ(this, 0);
    }

    private void onDebugInfo() {
        new SimpleTask<Long>() {
            @Override
            protected Long onExecute(Context context, Bundle args) throws IOException {
                return Log.getDebugInfo(context, R.string.title_debug_info_remark, null, null).id;
            }

            @Override
            protected void onExecuted(Bundle args, Long id) {
                startActivity(new Intent(ActivitySetup.this, ActivityCompose.class)
                        .putExtra("action", "edit")
                        .putExtra("id", id));
            }

            @Override
            protected void onException(Bundle args, Throwable ex) {
                if (ex instanceof IllegalArgumentException)
                    ToastEx.makeText(ActivitySetup.this, ex.getMessage(), Toast.LENGTH_LONG).show();
                else
                    Log.unexpectedError(getSupportFragmentManager(), ex);
            }

        }.execute(this, new Bundle(), "debug:info");
    }

    private void onMenuPrivacy() {
        Bundle args = new Bundle();
        args.putString("name", "PRIVACY.md");
        FragmentDialogMarkdown fragment = new FragmentDialogMarkdown();
        fragment.setArguments(args);
        fragment.show(getSupportFragmentManager(), "privacy");
    }

    private void onMenuAbout() {
        if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.STARTED))
            getSupportFragmentManager().popBackStack("about", FragmentManager.POP_BACK_STACK_INCLUSIVE);

        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(R.id.content_frame, new FragmentAbout()).addToBackStack("about");
        fragmentTransaction.commit();
    }

    private void handleExport(Intent data, String password) {
        Bundle args = new Bundle();
        args.putParcelable("uri", data.getData());
        args.putString("password", password);

        new SimpleTask<Void>() {
            @Override
            protected void onPreExecute(Bundle args) {
                ToastEx.makeText(ActivitySetup.this, R.string.title_executing, Toast.LENGTH_LONG).show();
            }

            @Override
            protected Void onExecute(Context context, Bundle args) throws Throwable {
                Uri uri = args.getParcelable("uri");
                String password = args.getString("password");

                if (!"content".equals(uri.getScheme())) {
                    Log.w("Export uri=" + uri);
                    throw new IllegalArgumentException(context.getString(R.string.title_no_stream));
                }

                Log.i("Collecting data");
                DB db = DB.getInstance(context);
                NotificationManager nm = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

                // Accounts
                JSONArray jaccounts = new JSONArray();
                for (EntityAccount account : db.account().getAccounts()) {
                    // Account
                    JSONObject jaccount = account.toJSON();

                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                        if (account.notify) {
                            NotificationChannel channel = nm.getNotificationChannel(
                                    EntityAccount.getNotificationChannelId(account.id));
                            if (channel != null && channel.getImportance() != NotificationManager.IMPORTANCE_NONE) {
                                JSONObject jchannel = NotificationHelper.channelToJSON(channel);
                                jaccount.put("channel", jchannel);
                                Log.i("Exported account channel=" + jchannel);
                            }
                        }
                    }

                    // Identities
                    JSONArray jidentities = new JSONArray();
                    for (EntityIdentity identity : db.identity().getIdentities(account.id))
                        jidentities.put(identity.toJSON());
                    jaccount.put("identities", jidentities);

                    // Folders
                    JSONArray jfolders = new JSONArray();
                    for (EntityFolder folder : db.folder().getFolders(account.id, false, true)) {
                        JSONObject jfolder = folder.toJSON();

                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                            NotificationChannel channel = nm.getNotificationChannel(
                                    EntityFolder.getNotificationChannelId(folder.id));
                            if (channel != null && channel.getImportance() != NotificationManager.IMPORTANCE_NONE) {
                                JSONObject jchannel = NotificationHelper.channelToJSON(channel);
                                jfolder.put("channel", jchannel);
                                Log.i("Exported folder channel=" + jchannel);
                            }
                        }

                        JSONArray jrules = new JSONArray();
                        for (EntityRule rule : db.rule().getRules(folder.id))
                            jrules.put(rule.toJSON());
                        jfolder.put("rules", jrules);

                        jfolders.put(jfolder);
                    }
                    jaccount.put("folders", jfolders);

                    // Contacts
                    JSONArray jcontacts = new JSONArray();
                    for (EntityContact contact : db.contact().getContacts(account.id))
                        jcontacts.put(contact.toJSON());
                    jaccount.put("contacts", jcontacts);

                    jaccounts.put(jaccount);
                }

                // Answers
                JSONArray janswers = new JSONArray();
                for (EntityAnswer answer : db.answer().getAnswers(true))
                    janswers.put(answer.toJSON());

                // Certificates
                JSONArray jcertificates = new JSONArray();
                for (EntityCertificate certificate : db.certificate().getCertificates())
                    jcertificates.put(certificate.toJSON());

                // Settings
                SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
                JSONArray jsettings = new JSONArray();
                for (String key : prefs.getAll().keySet()) {
                    JSONObject jsetting = new JSONObject();
                    Object value = prefs.getAll().get(key);
                    jsetting.put("key", key);
                    jsetting.put("value", value);
                    if (value instanceof Boolean)
                        jsetting.put("type", "bool");
                    else if (value instanceof Integer)
                        jsetting.put("type", "int");
                    else if (value instanceof Long)
                        jsetting.put("type", "long");
                    else if (value instanceof String)
                        jsetting.put("type", "string");
                    else if (value != null) {
                        String type = value.getClass().getName();
                        Log.w("Unknown type=" + type);
                        jsetting.put("type", type);
                    }
                    jsettings.put(jsetting);
                }

                JSONObject jexport = new JSONObject();
                jexport.put("accounts", jaccounts);
                jexport.put("answers", janswers);
                jexport.put("certificates", jcertificates);
                jexport.put("settings", jsettings);

                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                    JSONArray jchannels = new JSONArray();
                    for (NotificationChannel channel : nm.getNotificationChannels()) {
                        String id = channel.getId();
                        if (id.startsWith("notification.") && id.contains("@") &&
                                channel.getImportance() != NotificationManager.IMPORTANCE_NONE) {
                            JSONObject jchannel = NotificationHelper.channelToJSON(channel);
                            jchannels.put(jchannel);
                            Log.i("Exported contact channel=" + jchannel);
                        }
                    }
                    jexport.put("channels", jchannels);
                }

                ContentResolver resolver = context.getContentResolver();
                DocumentFile file = DocumentFile.fromSingleUri(context, uri);
                try (OutputStream raw = resolver.openOutputStream(uri)) {
                    Log.i("Writing URI=" + uri + " name=" + file.getName() + " virtual=" + file.isVirtual());

                    if (TextUtils.isEmpty(password))
                        raw.write(jexport.toString(2).getBytes());
                    else {
                        byte[] salt = new byte[16];
                        SecureRandom random = new SecureRandom();
                        random.nextBytes(salt);

                        // https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#Cipher
                        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
                        KeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt, KEY_ITERATIONS, KEY_LENGTH);
                        SecretKey secret = keyFactory.generateSecret(keySpec);
                        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
                        cipher.init(Cipher.ENCRYPT_MODE, secret);

                        raw.write(salt);
                        raw.write(cipher.getIV());

                        OutputStream cout = new CipherOutputStream(raw, cipher);
                        cout.write(jexport.toString(2).getBytes());
                        cout.flush();
                        raw.write(cipher.doFinal());
                    }

                    Log.i("Exported data");
                }

                return null;
            }

            @Override
            protected void onExecuted(Bundle args, Void data) {
                ToastEx.makeText(ActivitySetup.this, R.string.title_setup_exported, Toast.LENGTH_LONG).show();
            }

            @Override
            protected void onException(Bundle args, Throwable ex) {
                if (ex instanceof IllegalArgumentException ||
                        ex instanceof FileNotFoundException)
                    ToastEx.makeText(ActivitySetup.this, ex.getMessage(), Toast.LENGTH_LONG).show();
                else
                    Log.unexpectedError(getSupportFragmentManager(), ex);
            }
        }.execute(this, args, "setup:export");
    }

    private void handleImport(Intent data, String password) {
        Bundle args = new Bundle();
        args.putParcelable("uri", data.getData());
        args.putString("password", password);

        new SimpleTask<Void>() {
            @Override
            protected void onPreExecute(Bundle args) {
                ToastEx.makeText(ActivitySetup.this, R.string.title_executing, Toast.LENGTH_LONG).show();
            }

            @Override
            protected Void onExecute(Context context, Bundle args) throws Throwable {
                Uri uri = args.getParcelable("uri");
                String password = args.getString("password");

                if (!"content".equals(uri.getScheme())) {
                    Log.w("Import uri=" + uri);
                    throw new IllegalArgumentException(context.getString(R.string.title_no_stream));
                }

                StringBuilder data = new StringBuilder();
                Log.i("Reading URI=" + uri);
                ContentResolver resolver = context.getContentResolver();
                try (InputStream raw = new BufferedInputStream(resolver.openInputStream(uri))) {

                    InputStream in;
                    if (TextUtils.isEmpty(password))
                        in = raw;
                    else {
                        byte[] salt = new byte[16];
                        byte[] prefix = new byte[16];
                        Helper.readBuffer(raw, salt);
                        Helper.readBuffer(raw, prefix);

                        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
                        KeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt, KEY_ITERATIONS, KEY_LENGTH);
                        SecretKey secret = keyFactory.generateSecret(keySpec);
                        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
                        IvParameterSpec iv = new IvParameterSpec(prefix);
                        cipher.init(Cipher.DECRYPT_MODE, secret, iv);

                        in = new CipherInputStream(raw, cipher);
                    }

                    BufferedReader reader = new BufferedReader(new InputStreamReader(in));
                    String line;
                    while ((line = reader.readLine()) != null)
                        data.append(line);
                }

                Log.i("Importing data");
                JSONObject jimport = new JSONObject(data.toString());

                DB db = DB.getInstance(context);
                NotificationManager nm = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
                try {
                    db.beginTransaction();

                    Map<Long, Long> xAnswer = new HashMap<>();
                    Map<Long, Long> xIdentity = new HashMap<>();
                    Map<Long, Long> xFolder = new HashMap<>();
                    List<EntityRule> rules = new ArrayList<>();

                    // Answers
                    JSONArray janswers = jimport.getJSONArray("answers");
                    for (int a = 0; a < janswers.length(); a++) {
                        JSONObject janswer = (JSONObject) janswers.get(a);
                        EntityAnswer answer = EntityAnswer.fromJSON(janswer);
                        long id = answer.id;
                        answer.id = null;

                        answer.id = db.answer().insertAnswer(answer);
                        xAnswer.put(id, answer.id);

                        Log.i("Imported answer=" + answer.name + " id=" + answer.id + " (" + id + ")");
                    }

                    EntityAccount primary = db.account().getPrimaryAccount();

                    // Accounts
                    JSONArray jaccounts = jimport.getJSONArray("accounts");
                    for (int a = 0; a < jaccounts.length(); a++) {
                        JSONObject jaccount = (JSONObject) jaccounts.get(a);
                        EntityAccount account = EntityAccount.fromJSON(jaccount);

                        if (account.auth_type == AUTH_TYPE_GMAIL) {
                            AccountManager am = AccountManager.get(context);
                            boolean found = false;
                            for (Account google : am.getAccountsByType(TYPE_GOOGLE))
                                if (account.user.equals(google.name)) {
                                    found = true;
                                    break;
                                }

                            if (!found) {
                                Log.i("Google account not found email=" + account.user);
                                continue;
                            }
                        }

                        Long aid = account.id;
                        account.id = null;

                        if (primary != null)
                            account.primary = false;

                        // Forward referenced
                        Long swipe_left = account.swipe_left;
                        Long swipe_right = account.swipe_right;
                        Long move_to = account.move_to;
                        if (account.swipe_left != null && account.swipe_left > 0)
                            account.swipe_left = null;
                        if (account.swipe_right != null && account.swipe_right > 0)
                            account.swipe_right = null;
                        account.move_to = null;

                        account.created = new Date().getTime();
                        account.id = db.account().insertAccount(account);
                        Log.i("Imported account=" + account.name + " id=" + account.id + " (" + aid + ")");

                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                            account.deleteNotificationChannel(context);

                            if (account.notify)
                                if (jaccount.has("channel")) {
                                    NotificationChannelGroup group = new NotificationChannelGroup("group." + account.id, account.name);
                                    nm.createNotificationChannelGroup(group);

                                    JSONObject jchannel = (JSONObject) jaccount.get("channel");
                                    jchannel.put("id", EntityAccount.getNotificationChannelId(account.id));
                                    jchannel.put("group", group.getId());
                                    nm.createNotificationChannel(NotificationHelper.channelFromJSON(context, jchannel));

                                    Log.i("Imported account channel=" + jchannel);
                                } else
                                    account.createNotificationChannel(context);
                        }

                        JSONArray jidentities = (JSONArray) jaccount.get("identities");
                        for (int i = 0; i < jidentities.length(); i++) {
                            JSONObject jidentity = (JSONObject) jidentities.get(i);
                            EntityIdentity identity = EntityIdentity.fromJSON(jidentity);
                            long id = identity.id;
                            identity.id = null;

                            identity.account = account.id;
                            identity.id = db.identity().insertIdentity(identity);
                            xIdentity.put(id, identity.id);

                            Log.i("Imported identity=" + identity.email + " id=" + identity + id + " (" + id + ")");
                        }

                        JSONArray jfolders = (JSONArray) jaccount.get("folders");
                        for (int f = 0; f < jfolders.length(); f++) {
                            JSONObject jfolder = (JSONObject) jfolders.get(f);
                            EntityFolder folder = EntityFolder.fromJSON(jfolder);
                            long id = folder.id;
                            folder.id = null;

                            folder.account = account.id;
                            folder.id = db.folder().insertFolder(folder);
                            xFolder.put(id, folder.id);

                            if (Objects.equals(swipe_left, id))
                                account.swipe_left = folder.id;
                            if (Objects.equals(swipe_right, id))
                                account.swipe_right = folder.id;
                            if (Objects.equals(move_to, id))
                                account.move_to = folder.id;

                            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                                String channelId = EntityFolder.getNotificationChannelId(folder.id);
                                nm.deleteNotificationChannel(channelId);

                                if (jfolder.has("channel")) {
                                    NotificationChannelGroup group = new NotificationChannelGroup("group." + account.id, account.name);
                                    nm.createNotificationChannelGroup(group);

                                    JSONObject jchannel = (JSONObject) jfolder.get("channel");
                                    jchannel.put("id", channelId);
                                    jchannel.put("group", group.getId());
                                    nm.createNotificationChannel(NotificationHelper.channelFromJSON(context, jchannel));

                                    Log.i("Imported folder channel=" + jchannel);
                                }
                            }

                            if (jfolder.has("rules")) {
                                JSONArray jrules = jfolder.getJSONArray("rules");
                                for (int r = 0; r < jrules.length(); r++) {
                                    JSONObject jrule = (JSONObject) jrules.get(r);
                                    EntityRule rule = EntityRule.fromJSON(jrule);
                                    rule.folder = folder.id;
                                    rules.add(rule);
                                }
                            }
                            Log.i("Imported folder=" + folder.name + " id=" + folder.id + " (" + id + ")");
                        }

                        // Contacts
                        if (jaccount.has("contacts")) {
                            JSONArray jcontacts = jaccount.getJSONArray("contacts");
                            for (int c = 0; c < jcontacts.length(); c++) {
                                JSONObject jcontact = (JSONObject) jcontacts.get(c);
                                EntityContact contact = EntityContact.fromJSON(jcontact);
                                contact.account = account.id;
                                if (db.contact().getContact(contact.account, contact.type, contact.email) == null)
                                    contact.id = db.contact().insertContact(contact);
                            }
                            Log.i("Imported contacts=" + jcontacts.length());
                        }

                        // Update swipe left/right
                        db.account().updateAccount(account);
                    }

                    for (EntityRule rule : rules) {
                        try {
                            JSONObject jaction = new JSONObject(rule.action);

                            int type = jaction.getInt("type");
                            switch (type) {
                                case EntityRule.TYPE_MOVE:
                                case EntityRule.TYPE_COPY:
                                    long target = jaction.getLong("target");
                                    Log.i("XLAT target " + target + " > " + xFolder.get(target));
                                    jaction.put("target", xFolder.get(target));
                                    break;
                                case EntityRule.TYPE_ANSWER:
                                    long identity = jaction.getLong("identity");
                                    long answer = jaction.getLong("answer");
                                    Log.i("XLAT identity " + identity + " > " + xIdentity.get(identity));
                                    Log.i("XLAT answer " + answer + " > " + xAnswer.get(answer));
                                    jaction.put("identity", xIdentity.get(identity));
                                    jaction.put("answer", xAnswer.get(answer));
                                    break;
                            }

                            rule.action = jaction.toString();
                        } catch (JSONException ex) {
                            Log.e(ex);
                        }

                        db.rule().insertRule(rule);
                    }

                    if (jimport.has("certificates")) {
                        JSONArray jcertificates = jimport.getJSONArray("certificates");
                        for (int c = 0; c < jcertificates.length(); c++) {
                            JSONObject jcertificate = (JSONObject) jcertificates.get(c);
                            EntityCertificate certificate = EntityCertificate.fromJSON(jcertificate);
                            EntityCertificate record = db.certificate().getCertificate(certificate.fingerprint, certificate.email);
                            if (record == null) {
                                db.certificate().insertCertificate(certificate);
                                Log.i("Imported certificate=" + certificate.email);
                            }
                        }
                    }

                    // Settings
                    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
                    SharedPreferences.Editor editor = prefs.edit();
                    JSONArray jsettings = jimport.getJSONArray("settings");
                    for (int s = 0; s < jsettings.length(); s++) {
                        JSONObject jsetting = (JSONObject) jsettings.get(s);
                        String key = jsetting.getString("key");

                        if ("pro".equals(key) && !BuildConfig.DEBUG)
                            continue;

                        if ("biometrics".equals(key) || "pin".equals(key))
                            continue;

                        if ("alert_once".equals(key) && !Log.isXiaomi())
                            continue;

                        if ("background_service".equals(key) &&
                                Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
                            continue;

                        if (key != null && key.startsWith("widget."))
                            continue;

                        Object value = jsetting.get("value");
                        String type = jsetting.optString("type");
                        Log.i("Setting name=" + key + " value=" + value + " type=" + type);
                        switch (type) {
                            case "bool":
                                editor.putBoolean(key, (Boolean) value);
                                break;
                            case "int":
                                editor.putInt(key, (Integer) value);
                                break;
                            case "long":
                                if (value instanceof Integer)
                                    editor.putLong(key, Long.valueOf((Integer) value));
                                else
                                    editor.putLong(key, (Long) value);
                                break;
                            case "string":
                                editor.putString(key, (String) value);
                                break;
                            default:
                                Log.w("Inferring type of value=" + value);
                                if (value instanceof Boolean)
                                    editor.putBoolean(key, (Boolean) value);
                                else if (value instanceof Integer) {
                                    Integer i = (Integer) value;
                                    if (key.endsWith(".account"))
                                        editor.putLong(key, Long.valueOf(i));
                                    else
                                        editor.putInt(key, i);
                                } else if (value instanceof Long)
                                    editor.putLong(key, (Long) value);
                                else if (value instanceof String)
                                    editor.putString(key, (String) value);
                                else
                                    throw new IllegalArgumentException("Unknown settings type key=" + key);
                        }

                        Log.i("Imported setting=" + key);
                    }
                    editor.apply();
                    ApplicationEx.upgrade(context);

                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                        if (jimport.has("channels")) {
                            JSONArray jchannels = jimport.getJSONArray("channels");
                            for (int i = 0; i < jchannels.length(); i++) {
                                JSONObject jchannel = (JSONObject) jchannels.get(i);

                                String channelId = jchannel.getString("id");
                                nm.deleteNotificationChannel(channelId);

                                nm.createNotificationChannel(NotificationHelper.channelFromJSON(context, jchannel));

                                Log.i("Imported contact channel=" + jchannel);
                            }
                        }
                    }

                    db.setTransactionSuccessful();
                } finally {
                    db.endTransaction();
                }

                Log.i("Imported data");

                return null;
            }

            @Override
            protected void onExecuted(Bundle args, Void data) {
                ToastEx.makeText(ActivitySetup.this, R.string.title_setup_imported, Toast.LENGTH_LONG).show();
                ServiceSynchronize.eval(ActivitySetup.this, "import");
            }

            @Override
            protected void onException(Bundle args, Throwable ex) {
                if (ex.getCause() instanceof BadPaddingException)
                    ToastEx.makeText(ActivitySetup.this, R.string.title_setup_password_invalid, Toast.LENGTH_LONG).show();
                else if (ex instanceof IOException && ex.getCause() instanceof IllegalBlockSizeException)
                    ToastEx.makeText(ActivitySetup.this, R.string.title_setup_import_invalid, Toast.LENGTH_LONG).show();
                else if (ex instanceof IllegalArgumentException ||
                        ex instanceof FileNotFoundException ||
                        ex instanceof JSONException)
                    ToastEx.makeText(ActivitySetup.this, ex.getMessage(), Toast.LENGTH_LONG).show();
                else
                    Log.unexpectedError(getSupportFragmentManager(), ex);
            }
        }.execute(this, args, "setup:import");
    }

    private void handleImportCertificate(Intent data) {
        Uri uri = data.getData();
        if (uri != null) {
            Bundle args = new Bundle();
            args.putParcelable("uri", uri);

            new SimpleTask<Void>() {
                @Override
                protected Void onExecute(Context context, Bundle args) throws Throwable {
                    Uri uri = args.getParcelable("uri");
                    Log.i("Import certificate uri=" + uri);

                    boolean der = false;
                    String extension = Helper.getExtension(uri.getLastPathSegment());
                    Log.i("Extension=" + extension);
                    if (!"pem".equalsIgnoreCase(extension))
                        try {
                            DocumentFile dfile = DocumentFile.fromSingleUri(context, uri);
                            String type = dfile.getType();
                            Log.i("Type=" + type);
                            if ("application/octet-stream".equals(type))
                                der = true;
                        } catch (Throwable ex) {
                            Log.w(ex);
                        }
                    Log.i("DER=" + der);

                    X509Certificate cert;
                    CertificateFactory fact = CertificateFactory.getInstance("X.509");
                    try (InputStream is = context.getContentResolver().openInputStream(uri)) {
                        if (der)
                            cert = (X509Certificate) fact.generateCertificate(is);
                        else {
                            // throws DecoderException extends IllegalStateException
                            PemObject pem = new PemReader(new InputStreamReader(is)).readPemObject();
                            if (pem == null)
                                throw new IllegalStateException("Invalid key file");
                            ByteArrayInputStream bis = new ByteArrayInputStream(pem.getContent());
                            cert = (X509Certificate) fact.generateCertificate(bis);
                        }
                    }

                    String fingerprint = EntityCertificate.getFingerprint(cert);
                    List<String> emails = EntityCertificate.getEmailAddresses(cert);

                    if (emails.size() == 0)
                        throw new IllegalArgumentException("No email address found in key");

                    DB db = DB.getInstance(context);
                    for (String email : emails) {
                        EntityCertificate record = db.certificate().getCertificate(fingerprint, email);
                        if (record == null) {
                            record = EntityCertificate.from(cert, email);
                            record.id = db.certificate().insertCertificate(record);
                        }
                    }

                    return null;
                }

                @Override
                protected void onException(Bundle args, Throwable ex) {
                    if (ex instanceof IllegalArgumentException)
                        ToastEx.makeText(ActivitySetup.this, ex.getMessage(), Toast.LENGTH_LONG).show();
                    else if (ex instanceof IllegalStateException ||
                            ex instanceof FileNotFoundException ||
                            ex instanceof CertificateException)
                        ToastEx.makeText(ActivitySetup.this, R.string.title_invalid_key, Toast.LENGTH_LONG).show();
                    else
                        Log.unexpectedError(getSupportFragmentManager(), ex);
                }
            }.execute(this, args, "setup:cert");
        }
    }

    private void onGmail(Intent intent) {
        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(R.id.content_frame, new FragmentGmail()).addToBackStack("quick");
        fragmentTransaction.commit();
    }

    private void onOAuth(Intent intent) {
        FragmentOAuth fragment = new FragmentOAuth();
        fragment.setArguments(intent.getExtras());
        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(R.id.content_frame, fragment).addToBackStack("quick");
        fragmentTransaction.commit();
    }

    private void onViewQuickSetup(Intent intent) {
        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(R.id.content_frame, new FragmentQuickSetup()).addToBackStack("quick");
        fragmentTransaction.commit();
    }

    private void onViewAccounts(Intent intent) {
        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(R.id.content_frame, new FragmentAccounts()).addToBackStack("accounts");
        fragmentTransaction.commit();
    }

    private void onViewIdentities(Intent intent) {
        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(R.id.content_frame, new FragmentIdentities()).addToBackStack("identities");
        fragmentTransaction.commit();
    }

    private void onEditAccount(Intent intent) {
        int protocol = intent.getIntExtra("protocol", EntityAccount.TYPE_IMAP);
        FragmentBase fragment;
        switch (protocol) {
            case EntityAccount.TYPE_IMAP:
                fragment = new FragmentAccount();
                break;
            case EntityAccount.TYPE_POP:
                fragment = new FragmentPop();
                break;
            default:
                throw new IllegalArgumentException("Unknown protocol=" + protocol);
        }
        fragment.setArguments(intent.getExtras());
        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(R.id.content_frame, fragment).addToBackStack("account");
        fragmentTransaction.commit();
    }

    private void onEditIdentity(Intent intent) {
        FragmentIdentity fragment = new FragmentIdentity();
        fragment.setArguments(intent.getExtras());
        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(R.id.content_frame, fragment).addToBackStack("identity");
        fragmentTransaction.commit();
    }

    private void onManageLocalContacts(Intent intent) {
        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(R.id.content_frame, new FragmentContacts()).addToBackStack("contacts");
        fragmentTransaction.commit();
    }

    private void onManageCertificates(Intent intent) {
        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(R.id.content_frame, new FragmentCertificates()).addToBackStack("certificates");
        fragmentTransaction.commit();
    }

    private void onImportCertificate(Intent intent) {
        Intent open = new Intent(Intent.ACTION_GET_CONTENT);
        open.addCategory(Intent.CATEGORY_OPENABLE);
        open.setType("*/*");
        if (open.resolveActivity(getPackageManager()) == null)  // system whitelisted
            ToastEx.makeText(this, R.string.title_no_saf, Toast.LENGTH_LONG).show();
        else
            startActivityForResult(Helper.getChooser(this, open), REQUEST_IMPORT_CERTIFICATE);
    }

    private void onSetupAdvanced(Intent intent) {
        new AlertDialog.Builder(this)
                .setTitle(R.string.title_advanced_hint_title)
                .setMessage(R.string.title_advanced_hint_message)
                .setPositiveButton(android.R.string.ok, null)
                .show();
    }

    private void onSetupMore(Intent intent) {
        drawerLayout.openDrawer(GravityCompat.START);
    }

    private static Intent getIntentExport() {
        Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        intent.setType("*/*");
        intent.putExtra(Intent.EXTRA_TITLE, "fairemail_" +
                new SimpleDateFormat("yyyyMMdd").format(new Date().getTime()) + ".backup");
        Helper.openAdvanced(intent);
        return intent;
    }

    private static Intent getIntentImport() {
        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        intent.setType("*/*");
        return intent;
    }

    public static class FragmentDialogPassword extends FragmentDialogBase {
        private TextInputLayout etPassword1;
        private TextInputLayout etPassword2;

        @Override
        public void onSaveInstanceState(@NonNull Bundle outState) {
            outState.putString("fair:password1", etPassword1.getEditText().getText().toString());
            outState.putString("fair:password2", etPassword2.getEditText().getText().toString());
            super.onSaveInstanceState(outState);
        }

        @NonNull
        @Override
        public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
            final boolean export = getArguments().getBoolean("export");

            View dview = LayoutInflater.from(getContext()).inflate(R.layout.dialog_password, null);
            etPassword1 = dview.findViewById(R.id.tilPassword1);
            etPassword2 = dview.findViewById(R.id.tilPassword2);
            TextView tvImportHint = dview.findViewById(R.id.tvImportHint);

            if (savedInstanceState != null) {
                etPassword1.getEditText().setText(savedInstanceState.getString("fair:password1"));
                etPassword2.getEditText().setText(savedInstanceState.getString("fair:password2"));
            }

            etPassword2.setVisibility(export ? View.VISIBLE : View.GONE);
            tvImportHint.setVisibility(export ? View.GONE : View.VISIBLE);

            return new AlertDialog.Builder(getContext())
                    .setView(dview)
                    .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            String password1 = etPassword1.getEditText().getText().toString();
                            String password2 = etPassword2.getEditText().getText().toString();

                            if (!BuildConfig.DEBUG && TextUtils.isEmpty(password1))
                                ToastEx.makeText(getContext(), R.string.title_setup_password_missing, Toast.LENGTH_LONG).show();
                            else {
                                if (!export || password1.equals(password2)) {
                                    ((ActivitySetup) getActivity()).password = password1;
                                    getActivity().startActivityForResult(
                                            Helper.getChooser(getContext(),
                                                    export ? getIntentExport() : getIntentImport()),
                                            export ? REQUEST_EXPORT : REQUEST_IMPORT);
                                } else
                                    ToastEx.makeText(getContext(), R.string.title_setup_password_different, Toast.LENGTH_LONG).show();
                            }
                        }
                    })
                    .setNegativeButton(android.R.string.cancel, null)
                    .create();
        }
    }

    private BroadcastReceiver receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.STARTED)) {
                String action = intent.getAction();
                if (ACTION_QUICK_GMAIL.equals(action))
                    onGmail(intent);
                else if (ACTION_QUICK_OAUTH.equals(action))
                    onOAuth(intent);
                else if (ACTION_QUICK_SETUP.equals(action))
                    onViewQuickSetup(intent);
                else if (ACTION_VIEW_ACCOUNTS.equals(action))
                    onViewAccounts(intent);
                else if (ACTION_VIEW_IDENTITIES.equals(action))
                    onViewIdentities(intent);
                else if (ACTION_EDIT_ACCOUNT.equals(action))
                    onEditAccount(intent);
                else if (ACTION_EDIT_IDENTITY.equals(action))
                    onEditIdentity(intent);
                else if (ACTION_MANAGE_LOCAL_CONTACTS.equals(action))
                    onManageLocalContacts(intent);
                else if (ACTION_MANAGE_CERTIFICATES.equals(action))
                    onManageCertificates(intent);
                else if (ACTION_IMPORT_CERTIFICATE.equals(action))
                    onImportCertificate(intent);
                else if (ACTION_SETUP_ADVANCED.equals(action))
                    onSetupAdvanced(intent);
                else if (ACTION_SETUP_MORE.equals(action))
                    onSetupMore(intent);
            }
        }
    };
}