package de.pixart.messenger.ui;

import android.Manifest;
import android.annotation.SuppressLint;
import android.app.Dialog;
import android.app.PendingIntent;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.databinding.DataBindingUtil;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.DrawableRes;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.app.ListFragment;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AlertDialog;
import android.support.v7.widget.Toolbar;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.util.Pair;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.InputMethodManager;
import android.widget.AdapterView;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;

import de.pixart.messenger.Config;
import de.pixart.messenger.R;
import de.pixart.messenger.databinding.ActivityStartConversationBinding;
import de.pixart.messenger.entities.Account;
import de.pixart.messenger.entities.Bookmark;
import de.pixart.messenger.entities.Contact;
import de.pixart.messenger.entities.Conversation;
import de.pixart.messenger.entities.ListItem;
import de.pixart.messenger.entities.Presence;
import de.pixart.messenger.services.EmojiService;
import de.pixart.messenger.services.XmppConnectionService;
import de.pixart.messenger.services.XmppConnectionService.OnRosterUpdate;
import de.pixart.messenger.ui.adapter.ListItemAdapter;
import de.pixart.messenger.ui.interfaces.OnBackendConnected;
import de.pixart.messenger.ui.util.JidDialog;
import de.pixart.messenger.ui.util.PendingItem;
import de.pixart.messenger.ui.util.SoftKeyboardUtils;
import de.pixart.messenger.utils.MenuDoubleTabUtil;
import de.pixart.messenger.utils.XmppUri;
import de.pixart.messenger.xmpp.OnUpdateBlocklist;
import de.pixart.messenger.xmpp.XmppConnection;
import rocks.xmpp.addr.Jid;

import static de.pixart.messenger.ui.SettingsActivity.USE_BUNDLED_EMOJIS;

public class StartConversationActivity extends XmppActivity implements XmppConnectionService.OnConversationUpdate, OnRosterUpdate, OnUpdateBlocklist, CreateConferenceDialog.CreateConferenceDialogListener, JoinConferenceDialog.JoinConferenceDialogListener {

    private final int REQUEST_SYNC_CONTACTS = 0x28cf;
    private final int REQUEST_CREATE_CONFERENCE = 0x39da;
    private final PendingItem<Intent> pendingViewIntent = new PendingItem<>();
    private final PendingItem<String> mInitialSearchValue = new PendingItem<>();
    private final AtomicBoolean oneShotKeyboardSuppress = new AtomicBoolean();
    public int conference_context_id;
    public int contact_context_id;
    private ListPagerAdapter mListPagerAdapter;
    private List<ListItem> contacts = new ArrayList<>();
    private ListItemAdapter mContactsAdapter;
    private List<ListItem> conferences = new ArrayList<>();
    private ListItemAdapter mConferenceAdapter;
    private List<String> mActivatedAccounts = new ArrayList<>();
    private EditText mSearchEditText;
    private AtomicBoolean mRequestedContactsPermission = new AtomicBoolean(false);
    private boolean mHideOfflineContacts = false;
    private MenuItem.OnActionExpandListener mOnActionExpandListener = new MenuItem.OnActionExpandListener() {

        @Override
        public boolean onMenuItemActionExpand(MenuItem item) {
            mSearchEditText.post(() -> {
                updateSearchViewHint();
                mSearchEditText.requestFocus();
                if (oneShotKeyboardSuppress.compareAndSet(true, false)) {
                    return;
                }
                InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                if (imm != null) {
                    imm.showSoftInput(mSearchEditText, InputMethodManager.SHOW_IMPLICIT);
                }
            });

            return true;
        }

        @Override
        public boolean onMenuItemActionCollapse(MenuItem item) {
            SoftKeyboardUtils.hideSoftKeyboard(StartConversationActivity.this);
            mSearchEditText.setText("");
            filter(null);
            return true;
        }
    };
    private TextWatcher mSearchTextWatcher = new TextWatcher() {

        @Override
        public void afterTextChanged(Editable editable) {
            filter(editable.toString());
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
        }
    };
    private MenuItem mMenuSearchView;
    private ListItemAdapter.OnTagClickedListener mOnTagClickedListener = new ListItemAdapter.OnTagClickedListener() {
        @Override
        public void onTagClicked(String tag) {
            if (mMenuSearchView != null) {
                mMenuSearchView.expandActionView();
                mSearchEditText.setText("");
                mSearchEditText.append(tag);
                filter(tag);
            }
        }
    };
    private Pair<Integer, Intent> mPostponedActivityResult;
    private Toast mToast;
    private UiCallback<Conversation> mAdhocConferenceCallback = new UiCallback<Conversation>() {
        @Override
        public void success(final Conversation conversation) {
            runOnUiThread(() -> {
                hideToast();
                switchToConversation(conversation);
            });
        }

        @Override
        public void error(final int errorCode, Conversation object) {
            runOnUiThread(() -> replaceToast(getString(errorCode)));
        }

        @Override
        public void userInputRequried(PendingIntent pi, Conversation object) {
        }
    };

    private ActivityStartConversationBinding binding;
    private TextView.OnEditorActionListener mSearchDone = new TextView.OnEditorActionListener() {
        @Override
        public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
            int pos = binding.startConversationViewPager.getCurrentItem();
            if (pos == 0) {
                if (contacts.size() == 1) {
                    openConversationForContact((Contact) contacts.get(0));
                    return true;
                } else if (contacts.size() == 0 && conferences.size() == 1) {
                    openConversationsForBookmark((Bookmark) conferences.get(0));
                    return true;
                }
            } else {
                if (conferences.size() == 1) {
                    openConversationsForBookmark((Bookmark) conferences.get(0));
                    return true;
                } else if (conferences.size() == 0 && contacts.size() == 1) {
                    openConversationForContact((Contact) contacts.get(0));
                    return true;
                }
            }
            SoftKeyboardUtils.hideSoftKeyboard(StartConversationActivity.this);
            mListPagerAdapter.requestFocus(pos);
            return true;
        }
    };
    private ViewPager.SimpleOnPageChangeListener mOnPageChangeListener = new ViewPager.SimpleOnPageChangeListener() {
        @Override
        public void onPageSelected(int position) {
            onTabChanged();
        }
    };

    public static void populateAccountSpinner(Context context, List<String> accounts, Spinner spinner) {
        if (accounts.size() > 0) {
            ArrayAdapter<String> adapter = new ArrayAdapter<>(context, R.layout.simple_list_item, accounts);
            adapter.setDropDownViewResource(R.layout.simple_list_item);
            spinner.setAdapter(adapter);
            spinner.setEnabled(true);
        } else {
            ArrayAdapter<String> adapter = new ArrayAdapter<>(context,
                    R.layout.simple_list_item,
                    Arrays.asList(context.getString(R.string.no_accounts)));
            adapter.setDropDownViewResource(R.layout.simple_list_item);
            spinner.setAdapter(adapter);
            spinner.setEnabled(false);
        }
    }

    public static void launch(Context context) {
        final Intent intent = new Intent(context, StartConversationActivity.class);
        context.startActivity(intent);
    }

    private static Intent createLauncherIntent(Context context) {
        final Intent intent = new Intent(context, StartConversationActivity.class);
        intent.setAction(Intent.ACTION_MAIN);
        intent.addCategory(Intent.CATEGORY_LAUNCHER);
        return intent;
    }

    private static boolean isViewIntent(final Intent i) {
        return i != null && (Intent.ACTION_VIEW.equals(i.getAction()) || Intent.ACTION_SENDTO.equals(i.getAction()) || i.hasExtra(WelcomeActivity.EXTRA_INVITE_URI));
    }

    protected void hideToast() {
        if (mToast != null) {
            mToast.cancel();
        }
    }

    protected void replaceToast(String msg) {
        hideToast();
        mToast = Toast.makeText(this, msg, Toast.LENGTH_LONG);
        mToast.show();
    }

    @Override
    public void onRosterUpdate() {
        this.refreshUi();
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        new EmojiService(this).init(useBundledEmoji());
        this.binding = DataBindingUtil.setContentView(this, R.layout.activity_start_conversation);
        Toolbar toolbar = (Toolbar) binding.toolbar;
        setSupportActionBar(toolbar);
        configureActionBar(getSupportActionBar());
        this.binding.fab.setOnClickListener((v) -> {
            if (binding.startConversationViewPager.getCurrentItem() == 0) {
                String searchString = mSearchEditText != null ? mSearchEditText.getText().toString() : null;
                if (searchString != null && !searchString.trim().isEmpty()) {
                    try {
                        Jid jid = Jid.of(searchString);
                        if (jid.getLocal() != null && jid.isBareJid() && jid.getDomain().contains(".")) {
                            showCreateContactDialog(jid.toString(), null);
                            return;
                        }
                    } catch (IllegalArgumentException ignored) {
                        //ignore and fall through
                    }
                }
                showCreateContactDialog(null, null);
            } else {
                showCreateConferenceDialog();
            }
        });
        binding.tabLayout.setupWithViewPager(binding.startConversationViewPager);
        binding.startConversationViewPager.addOnPageChangeListener(mOnPageChangeListener);
        mListPagerAdapter = new ListPagerAdapter(getSupportFragmentManager());
        binding.startConversationViewPager.setAdapter(mListPagerAdapter);

        mConferenceAdapter = new ListItemAdapter(this, conferences);
        mContactsAdapter = new ListItemAdapter(this, contacts);
        mContactsAdapter.setOnTagClickedListener(this.mOnTagClickedListener);
        final SharedPreferences preferences = getPreferences();

        this.mHideOfflineContacts = preferences.getBoolean("hide_offline", false);

        final boolean startSearching = preferences.getBoolean("start_searching", getResources().getBoolean(R.bool.start_searching));

        final Intent intent;
        if (savedInstanceState == null) {
            intent = getIntent();
        } else {
            final String search = savedInstanceState.getString("search");
            if (search != null) {
                mInitialSearchValue.push(search);
            }
            intent = savedInstanceState.getParcelable("intent");
        }

        if (isViewIntent(intent)) {
            pendingViewIntent.push(intent);
            setIntent(createLauncherIntent(this));
        } else if (startSearching && mInitialSearchValue.peek() == null) {
            mInitialSearchValue.push("");
        }
    }

    @Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
        Intent pendingIntent = pendingViewIntent.peek();
        savedInstanceState.putParcelable("intent", pendingIntent != null ? pendingIntent : getIntent());
        if (mMenuSearchView != null && mMenuSearchView.isActionViewExpanded()) {
            savedInstanceState.putString("search", mSearchEditText != null ? mSearchEditText.getText().toString() : null);
        }
        super.onSaveInstanceState(savedInstanceState);
    }

    @Override
    public void onStart() {
        super.onStart();
        final int theme = findTheme();
        if (this.mTheme != theme) {
            recreate();
        } else {
            if (pendingViewIntent.peek() == null) {
                askForContactsPermissions();
            }
        }
        mConferenceAdapter.refreshSettings();
        mContactsAdapter.refreshSettings();
    }

    @Override
    public void onNewIntent(final Intent intent) {
        if (xmppConnectionServiceBound) {
            processViewIntent(intent);
        } else {
            pendingViewIntent.push(intent);
        }
        setIntent(createLauncherIntent(this));
    }

    protected void openConversationForContact(int position) {
        Contact contact = (Contact) contacts.get(position);
        openConversationForContact(contact);
    }

    protected void openConversationForContact(Contact contact) {
        Conversation conversation = xmppConnectionService.findOrCreateConversation(contact.getAccount(), contact.getJid(), false, true);
        SoftKeyboardUtils.hideSoftKeyboard(this);
        switchToConversation(conversation);
    }

    protected void openConversationForBookmark() {
        openConversationForBookmark(conference_context_id);
    }

    protected void openConversationForBookmark(int position) {
        Bookmark bookmark = (Bookmark) conferences.get(position);
        openConversationsForBookmark(bookmark);
    }

    protected void shareBookmarkUri() {
        shareBookmarkUri(conference_context_id);
    }

    protected void shareBookmarkUri(int position) {
        Bookmark bookmark = (Bookmark) conferences.get(position);
        Intent shareIntent = new Intent();
        shareIntent.setAction(Intent.ACTION_SEND);
        shareIntent.putExtra(Intent.EXTRA_TEXT, "xmpp:" + bookmark.getJid().asBareJid().toEscapedString() + "?join");
        shareIntent.setType("text/plain");
        try {
            startActivity(Intent.createChooser(shareIntent, getText(R.string.share_uri_with)));
            overridePendingTransition(R.animator.fade_in, R.animator.fade_out);
        } catch (ActivityNotFoundException e) {
            Toast.makeText(this, R.string.no_application_to_share_uri, Toast.LENGTH_SHORT).show();
        }
    }

    protected void openConversationsForBookmark(Bookmark bookmark) {
        Jid jid = bookmark.getJid();
        if (jid == null) {
            Toast.makeText(this, R.string.invalid_jid, Toast.LENGTH_SHORT).show();
            return;
        }
        Conversation conversation = xmppConnectionService.findOrCreateConversation(bookmark.getAccount(), jid, true, true, true);
        bookmark.setConversation(conversation);
        if (!bookmark.autojoin() && getPreferences().getBoolean("autojoin", getResources().getBoolean(R.bool.autojoin))) {
            bookmark.setAutojoin(true);
            xmppConnectionService.pushBookmarks(bookmark.getAccount());
        }
        SoftKeyboardUtils.hideSoftKeyboard(this);
        switchToConversation(conversation);
    }

    protected void openDetailsForContact() {
        int position = contact_context_id;
        Contact contact = (Contact) contacts.get(position);
        switchToContactDetails(contact);
    }

    protected void showQrForContact() {
        int position = contact_context_id;
        Contact contact = (Contact) contacts.get(position);
        showQrCode("xmpp:" + contact.getJid().asBareJid().toEscapedString());
    }

    protected void toggleContactBlock() {
        final int position = contact_context_id;
        BlockContactDialog.show(this, (Contact) contacts.get(position));
    }

    protected void deleteContact() {
        final int position = contact_context_id;
        final Contact contact = (Contact) contacts.get(position);
        final AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setNegativeButton(R.string.cancel, null);
        builder.setTitle(R.string.action_delete_contact);
        builder.setMessage(JidDialog.style(this, R.string.remove_contact_text, contact.getJid().toEscapedString()));
        builder.setPositiveButton(R.string.delete, (dialog, which) -> {
            xmppConnectionService.deleteContactOnServer(contact);
            filter(mSearchEditText.getText().toString());
        });
        builder.create().show();
    }

    protected void deleteConference() {
        int position = conference_context_id;
        final Bookmark bookmark = (Bookmark) conferences.get(position);

        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setNegativeButton(R.string.cancel, null);
        builder.setTitle(R.string.delete_bookmark);
        builder.setMessage(JidDialog.style(this, R.string.remove_bookmark_text, bookmark.getJid().toEscapedString()));
        builder.setPositiveButton(R.string.delete, (dialog, which) -> {
            bookmark.setConversation(null);
            Account account = bookmark.getAccount();
            account.getBookmarks().remove(bookmark);
            xmppConnectionService.pushBookmarks(account);
            filter(mSearchEditText.getText().toString());
        });
        builder.create().show();

    }

    @SuppressLint("InflateParams")
    protected void showCreateContactDialog(final String prefilledJid, final Invite invite) {
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        Fragment prev = getSupportFragmentManager().findFragmentByTag(FRAGMENT_TAG_DIALOG);
        if (prev != null) {
            ft.remove(prev);
        }
        boolean multiAccount = false;
        try {
            multiAccount = xmppConnectionService.multipleAccounts();
        } catch (Exception e) {
            e.printStackTrace();
        }
        ft.addToBackStack(null);
        EnterJidDialog dialog = EnterJidDialog.newInstance(
                mActivatedAccounts,
                getString(R.string.create_contact),
                getString(R.string.create),
                prefilledJid,
                null,
                invite == null || !invite.hasFingerprints(),
                multiAccount
        );

        dialog.setOnEnterJidDialogPositiveListener((accountJid, contactJid) -> {
            if (!xmppConnectionServiceBound) {
                return false;
            }

            final Account account = xmppConnectionService.findAccountByJid(accountJid);
            if (account == null) {
                return true;
            }

            final Contact contact = account.getRoster().getContact(contactJid);
            if (invite != null && invite.getName() != null) {
                contact.setServerName(invite.getName());
            }
            if (contact.isSelf()) {
                switchToConversation(contact, null);
                return true;
            } else if (contact.showInRoster()) {
                throw new EnterJidDialog.JidError(getString(R.string.contact_already_exists));
            } else {
                xmppConnectionService.createContact(contact, true);
                if (invite != null && invite.hasFingerprints()) {
                    xmppConnectionService.verifyFingerprints(contact, invite.getFingerprints());
                }
                switchToConversation(contact, invite == null ? null : invite.getBody());
                return true;
            }
        });

        dialog.show(ft, FRAGMENT_TAG_DIALOG);
    }

    @SuppressLint("InflateParams")
    protected void showJoinConferenceDialog(final String prefilledJid) {
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        Fragment prev = getSupportFragmentManager().findFragmentByTag(FRAGMENT_TAG_DIALOG);
        if (prev != null) {
            ft.remove(prev);
        }
        ft.addToBackStack(null);
        JoinConferenceDialog joinConferenceFragment = JoinConferenceDialog.newInstance(prefilledJid, mActivatedAccounts, xmppConnectionService.multipleAccounts());
        joinConferenceFragment.show(ft, FRAGMENT_TAG_DIALOG);
    }

    private void showCreateConferenceDialog() {
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        Fragment prev = getSupportFragmentManager().findFragmentByTag(FRAGMENT_TAG_DIALOG);
        if (prev != null) {
            ft.remove(prev);
        }
        ft.addToBackStack(null);
        CreateConferenceDialog createConferenceFragment = CreateConferenceDialog.newInstance(mActivatedAccounts, xmppConnectionService.multipleAccounts());
        createConferenceFragment.show(ft, FRAGMENT_TAG_DIALOG);
    }

    private Account getSelectedAccount(Spinner spinner) {
        if (!spinner.isEnabled()) {
            return null;
        }
        Jid jid;
        try {
            if (Config.DOMAIN_LOCK != null) {
                jid = Jid.of((String) spinner.getSelectedItem(), Config.DOMAIN_LOCK, null);
            } else {
                jid = Jid.of((String) spinner.getSelectedItem());
            }
        } catch (final IllegalArgumentException e) {
            return null;
        }
        return xmppConnectionService.findAccountByJid(jid);
    }

    protected void switchToConversation(Contact contact, String body) {
        Conversation conversation = xmppConnectionService.findOrCreateConversation(contact.getAccount(), contact.getJid(), false, true);
        switchToConversation(conversation, body, false);
    }

    @Override
    public void invalidateOptionsMenu() {
        boolean isExpanded = mMenuSearchView != null && mMenuSearchView.isActionViewExpanded();
        String text = mSearchEditText != null ? mSearchEditText.getText().toString() : "";
        if (isExpanded) {
            mInitialSearchValue.push(text);
            oneShotKeyboardSuppress.set(true);
        }
        super.invalidateOptionsMenu();
    }

    private void updateSearchViewHint() {
        if (binding == null || mSearchEditText == null) {
            return;
        }
        if (binding.startConversationViewPager.getCurrentItem() == 0) {
            mSearchEditText.setHint(R.string.search_contacts);
        } else {
            mSearchEditText.setHint(R.string.search_groups);
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.start_conversation, menu);
        MenuItem menuHideOffline = menu.findItem(R.id.action_hide_offline);
        MenuItem menuActionAccounts = menu.findItem(R.id.action_accounts);
        if (xmppConnectionService != null && xmppConnectionService.getAccounts().size() == 1 && !xmppConnectionService.multipleAccounts()) {
            menuActionAccounts.setTitle(R.string.mgmt_account_edit);
        } else {
            menuActionAccounts.setTitle(R.string.action_accounts);
        }
        MenuItem joinGroupChat = menu.findItem(R.id.action_join_conference);
        MenuItem qrCodeScanMenuItem = menu.findItem(R.id.action_scan_qr_code);
        joinGroupChat.setVisible(binding.startConversationViewPager.getCurrentItem() == 1);
        qrCodeScanMenuItem.setVisible(isCameraFeatureAvailable());
        menuHideOffline.setChecked(this.mHideOfflineContacts);
        mMenuSearchView = menu.findItem(R.id.action_search);
        mMenuSearchView.setOnActionExpandListener(mOnActionExpandListener);
        View mSearchView = mMenuSearchView.getActionView();
        mSearchEditText = mSearchView.findViewById(R.id.search_field);
        mSearchEditText.addTextChangedListener(mSearchTextWatcher);
        mSearchEditText.setOnEditorActionListener(mSearchDone);
        String initialSearchValue = mInitialSearchValue.pop();
        if (initialSearchValue != null) {
            mMenuSearchView.expandActionView();
            mSearchEditText.append(initialSearchValue);
            filter(initialSearchValue);
        }
        updateSearchViewHint();
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (MenuDoubleTabUtil.shouldIgnoreTap()) {
            return false;
        }
        switch (item.getItemId()) {
            case android.R.id.home:
                navigateBack();
                return true;
            case R.id.action_join_conference:
                showJoinConferenceDialog(null);
                return true;
            case R.id.action_scan_qr_code:
                UriHandlerActivity.scan(this);
                return true;
            case R.id.action_hide_offline:
                mHideOfflineContacts = !item.isChecked();
                getPreferences().edit().putBoolean("hide_offline", mHideOfflineContacts).commit();
                if (mSearchEditText != null) {
                    filter(mSearchEditText.getText().toString());
                }
                invalidateOptionsMenu();
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_SEARCH && !event.isLongPress()) {
            openSearch();
            return true;
        }
        int c = event.getUnicodeChar();
        if (c > 32) {
            if (mSearchEditText != null && !mSearchEditText.isFocused()) {
                openSearch();
                mSearchEditText.append(Character.toString((char) c));
                return true;
            }
        }
        return super.onKeyUp(keyCode, event);
    }

    private void openSearch() {
        if (mMenuSearchView != null) {
            mMenuSearchView.expandActionView();
        }
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent intent) {
        if (resultCode == RESULT_OK) {
            if (xmppConnectionServiceBound) {
                this.mPostponedActivityResult = null;
                if (requestCode == REQUEST_CREATE_CONFERENCE) {
                    Account account = extractAccount(intent);
                    final String name = intent.getStringExtra(ChooseContactActivity.EXTRA_GROUP_CHAT_NAME);
                    final List<Jid> jids = ChooseContactActivity.extractJabberIds(intent);
                    if (account != null && jids.size() > 0) {
                        if (xmppConnectionService.createAdhocConference(account, name, jids, mAdhocConferenceCallback)) {
                            mToast = Toast.makeText(this, R.string.creating_conference, Toast.LENGTH_LONG);
                            mToast.show();
                        }
                    }
                }
            } else {
                this.mPostponedActivityResult = new Pair<>(requestCode, intent);
            }
        }
        super.onActivityResult(requestCode, requestCode, intent);
    }

    private void askForContactsPermissions() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (checkSelfPermission(Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
                if (mRequestedContactsPermission.compareAndSet(false, true)) {
                    if (shouldShowRequestPermissionRationale(Manifest.permission.READ_CONTACTS)) {
                        AlertDialog.Builder builder = new AlertDialog.Builder(this);
                        builder.setTitle(R.string.sync_with_contacts);
                        builder.setMessage(R.string.sync_with_contacts_long);
                        builder.setPositiveButton(R.string.next, (dialog, which) -> requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, REQUEST_SYNC_CONTACTS));
                        builder.setOnDismissListener(dialog -> requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, REQUEST_SYNC_CONTACTS));
                        builder.create().show();
                    } else {
                        requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, REQUEST_SYNC_CONTACTS);
                    }
                }
            }
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults) {
        if (grantResults.length > 0) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                ScanActivity.onRequestPermissionResult(this, requestCode, grantResults);
                if (requestCode == REQUEST_SYNC_CONTACTS && xmppConnectionServiceBound) {
                    xmppConnectionService.startContactObserver();
                }
            }
        }
    }

    private void configureHomeButton() {
        final ActionBar actionBar = getSupportActionBar();
        if (actionBar == null) {
            return;
        }
        boolean openConversations = !xmppConnectionService.isConversationsListEmpty(null);
        actionBar.setDisplayHomeAsUpEnabled(openConversations);
        actionBar.setDisplayHomeAsUpEnabled(openConversations);

    }

    @Override
    protected void onBackendConnected() {
        if (mPostponedActivityResult != null) {
            onActivityResult(mPostponedActivityResult.first, RESULT_OK, mPostponedActivityResult.second);
            this.mPostponedActivityResult = null;
        }
        this.mActivatedAccounts.clear();
        for (Account account : xmppConnectionService.getAccounts()) {
            if (account.getStatus() != Account.State.DISABLED) {
                if (Config.DOMAIN_LOCK != null) {
                    this.mActivatedAccounts.add(account.getJid().getLocal());
                } else {
                    this.mActivatedAccounts.add(account.getJid().asBareJid().toString());
                }
            }
        }
        configureHomeButton();
        Intent intent = pendingViewIntent.pop();
        if (intent != null && processViewIntent(intent)) {
            filter(null);
        } else {
            if (mSearchEditText != null) {
                filter(mSearchEditText.getText().toString());
            } else {
                filter(null);
            }
        }
        Fragment fragment = getSupportFragmentManager().findFragmentByTag(FRAGMENT_TAG_DIALOG);
        if (fragment != null && fragment instanceof OnBackendConnected) {
            Log.d(Config.LOGTAG, "calling on backend connected on dialog");
            ((OnBackendConnected) fragment).onBackendConnected();
        }
    }

    protected boolean processViewIntent(@NonNull Intent intent) {
        final String inviteUri = intent.getStringExtra(WelcomeActivity.EXTRA_INVITE_URI);
        if (inviteUri != null) {
            Invite invite = new Invite(inviteUri);
            if (invite.isJidValid()) {
                return invite.invite();
            }
        }
        final String action = intent.getAction();
        if (action == null) {
            return false;
        }
        switch (action) {
            case Intent.ACTION_SENDTO:
            case Intent.ACTION_VIEW:
                Uri uri = intent.getData();
                if (uri != null) {
                    Invite invite = new Invite(intent.getData(), intent.getBooleanExtra("scanned", false));
                    invite.account = intent.getStringExtra("account");
                    return invite.invite();
                } else {
                    return false;
                }
        }
        return false;
    }

    private boolean handleJid(Invite invite) {
        List<Contact> contacts = xmppConnectionService.findContacts(invite.getJid(), invite.account);
        if (invite.isAction(XmppUri.ACTION_JOIN)) {
            Conversation muc = xmppConnectionService.findFirstMuc(invite.getJid());
            if (muc != null) {
                switchToConversation(muc, invite.getBody(), false);
                return true;
            } else {
                showJoinConferenceDialog(invite.getJid().asBareJid().toString());
                return false;
            }
        } else if (contacts.size() == 0) {
            showCreateContactDialog(invite.getJid().toString(), invite);
            return false;
        } else if (contacts.size() == 1) {
            Contact contact = contacts.get(0);
            if (!invite.isSafeSource() && invite.hasFingerprints()) {
                displayVerificationWarningDialog(contact, invite);
            } else {
                if (invite.hasFingerprints()) {
                    if (xmppConnectionService.verifyFingerprints(contact, invite.getFingerprints())) {
                        Toast.makeText(this, R.string.verified_fingerprints, Toast.LENGTH_SHORT).show();
                    }
                }
                if (invite.account != null) {
                    xmppConnectionService.getShortcutService().report(contact);
                }
                switchToConversation(contact, invite.getBody());
            }
            return true;
        } else {
            if (mMenuSearchView != null) {
                mMenuSearchView.expandActionView();
                mSearchEditText.setText("");
                mSearchEditText.append(invite.getJid().toString());
                filter(invite.getJid().toString());
            } else {
                mInitialSearchValue.push(invite.getJid().toString());
            }
            return true;
        }
    }

    private void displayVerificationWarningDialog(final Contact contact, final Invite invite) {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle(R.string.verify_omemo_keys);
        View view = getLayoutInflater().inflate(R.layout.dialog_verify_fingerprints, null);
        final CheckBox isTrustedSource = view.findViewById(R.id.trusted_source);
        TextView warning = view.findViewById(R.id.warning);
        warning.setText(JidDialog.style(this, R.string.verifying_omemo_keys_trusted_source, contact.getJid().asBareJid().toEscapedString(), contact.getDisplayName()));
        builder.setView(view);
        builder.setPositiveButton(R.string.confirm, (dialog, which) -> {
            if (isTrustedSource.isChecked() && invite.hasFingerprints()) {
                xmppConnectionService.verifyFingerprints(contact, invite.getFingerprints());
            }
            switchToConversation(contact, invite.getBody());
        });
        builder.setNegativeButton(R.string.cancel, (dialog, which) -> StartConversationActivity.this.finish());
        AlertDialog dialog = builder.create();
        dialog.setCanceledOnTouchOutside(false);
        dialog.setOnCancelListener(dialog1 -> StartConversationActivity.this.finish());
        dialog.show();
    }

    protected void filter(String needle) {
        if (xmppConnectionServiceBound) {
            this.filterContacts(needle);
            this.filterConferences(needle);
        }
    }

    protected void filterContacts(String needle) {
        this.contacts.clear();
        final List<Account> accounts = xmppConnectionService.getAccounts();
        final boolean singleAccountActive = isSingleAccountActive(accounts);
        for (Account account : accounts) {
            if (account.getStatus() != Account.State.DISABLED) {
                for (Contact contact : account.getRoster().getContacts()) {
                    Presence.Status s = contact.getShownStatus();
                    if ((contact.showInRoster() || (singleAccountActive && contact.showInPhoneBook())) && contact.match(this, needle)
                            && (!this.mHideOfflineContacts
                            || (needle != null && !needle.trim().isEmpty())
                            || s.compareTo(Presence.Status.OFFLINE) < 0)) {
                        this.contacts.add(contact);
                    }
                }
            }
        }
        Collections.sort(this.contacts);
        mContactsAdapter.notifyDataSetChanged();
    }

    private static boolean isSingleAccountActive(final List<Account> accounts) {
        int i = 0;
        for(Account account : accounts) {
            if (account.getStatus() != Account.State.DISABLED) {
                ++i;
            }
        }
        return i == 1;
    }

    protected void filterConferences(String needle) {
        this.conferences.clear();
        for (Account account : xmppConnectionService.getAccounts()) {
            if (account.getStatus() != Account.State.DISABLED) {
                for (Bookmark bookmark : account.getBookmarks()) {
                    if (bookmark.match(this, needle)) {
                        this.conferences.add(bookmark);
                    }
                }
            }
        }
        Collections.sort(this.conferences);
        mConferenceAdapter.notifyDataSetChanged();
    }

    private void onTabChanged() {
        @DrawableRes final int fabDrawable;
        if (binding.startConversationViewPager.getCurrentItem() == 0) {
            fabDrawable = R.drawable.ic_person_add_white_24dp;
        } else {
            fabDrawable = R.drawable.ic_group_add_white_24dp;
        }
        binding.fab.setImageResource(fabDrawable);
        invalidateOptionsMenu();
    }

    @Override
    public void OnUpdateBlocklist(final Status status) {
        refreshUi();
    }

    @Override
    protected void refreshUiReal() {
        if (mSearchEditText != null) {
            filter(mSearchEditText.getText().toString());
        }
        configureHomeButton();
    }

    @Override
    public void onBackPressed() {
        navigateBack();
    }

    private void navigateBack() {
        if (xmppConnectionService != null && !xmppConnectionService.isConversationsListEmpty(null)) {
            Intent intent = new Intent(this, ConversationsActivity.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
            startActivity(intent);
        }
        finish();
    }

    public boolean useBundledEmoji() {
        return getPreferences().getBoolean(USE_BUNDLED_EMOJIS, getResources().getBoolean(R.bool.use_bundled_emoji));
    }

    @Override
    public void onCreateDialogPositiveClick(Spinner spinner, String name) {
        if (!xmppConnectionServiceBound) {
            return;
        }
        final Account account = getSelectedAccount(spinner);
        if (account == null) {
            return;
        }
        Intent intent = new Intent(getApplicationContext(), ChooseContactActivity.class);
        intent.putExtra(ChooseContactActivity.EXTRA_SHOW_ENTER_JID, false);
        intent.putExtra(ChooseContactActivity.EXTRA_SELECT_MULTIPLE, true);
        intent.putExtra(ChooseContactActivity.EXTRA_GROUP_CHAT_NAME, name.trim());
        intent.putExtra(ChooseContactActivity.EXTRA_ACCOUNT, account.getJid().asBareJid().toString());
        intent.putExtra(ChooseContactActivity.EXTRA_TITLE_RES_ID, R.string.choose_participants);
        startActivityForResult(intent, REQUEST_CREATE_CONFERENCE);
        overridePendingTransition(R.animator.fade_in, R.animator.fade_out);
    }

    @Override
    public void onJoinDialogPositiveClick(Dialog dialog, Spinner spinner, AutoCompleteTextView jid, boolean isBookmarkChecked) {
        if (!xmppConnectionServiceBound) {
            return;
        }
        final Account account = getSelectedAccount(spinner);
        if (account == null) {
            return;
        }
        final Jid conferenceJid;
        try {
            conferenceJid = Jid.of(jid.getText().toString());
        } catch (final IllegalArgumentException e) {
            jid.setError(getString(R.string.invalid_jid));
            return;
        }

        if (isBookmarkChecked) {
            if (account.hasBookmarkFor(conferenceJid)) {
                jid.setError(getString(R.string.bookmark_already_exists));
            } else {
                final Bookmark bookmark = new Bookmark(account, conferenceJid.asBareJid());
                bookmark.setAutojoin(getBooleanPreference("autojoin", R.bool.autojoin));
                String nick = conferenceJid.getResource();
                if (nick != null && !nick.isEmpty()) {
                    bookmark.setNick(nick);
                }
                account.getBookmarks().add(bookmark);
                xmppConnectionService.pushBookmarks(account);
                final Conversation conversation = xmppConnectionService
                        .findOrCreateConversation(account, conferenceJid, true, true, true);
                bookmark.setConversation(conversation);
                dialog.dismiss();
                switchToConversation(conversation);
            }
        } else {
            final Conversation conversation = xmppConnectionService
                    .findOrCreateConversation(account, conferenceJid, true, true, true);
            dialog.dismiss();
            switchToConversation(conversation);
        }
    }

    @Override
    public void onConversationUpdate() {
        refreshUi();
    }

    public static class MyListFragment extends ListFragment {
        private AdapterView.OnItemClickListener mOnItemClickListener;
        private int mResContextMenu;

        public void setContextMenu(final int res) {
            this.mResContextMenu = res;
        }

        @Override
        public void onListItemClick(final ListView l, final View v, final int position, final long id) {
            if (mOnItemClickListener != null) {
                mOnItemClickListener.onItemClick(l, v, position, id);
            }
        }

        public void setOnListItemClickListener(AdapterView.OnItemClickListener l) {
            this.mOnItemClickListener = l;
        }

        @Override
        public void onViewCreated(@NonNull final View view, final Bundle savedInstanceState) {
            super.onViewCreated(view, savedInstanceState);
            registerForContextMenu(getListView());
            getListView().setFastScrollEnabled(true);
            getListView().setDivider(null);
            getListView().setDividerHeight(0);
        }

        @Override
        public void onCreateContextMenu(final ContextMenu menu, final View v, final ContextMenuInfo menuInfo) {
            super.onCreateContextMenu(menu, v, menuInfo);
            final StartConversationActivity activity = (StartConversationActivity) getActivity();
            if (activity == null) {
                return;
            }
            activity.getMenuInflater().inflate(mResContextMenu, menu);
            final AdapterView.AdapterContextMenuInfo acmi = (AdapterContextMenuInfo) menuInfo;
            if (mResContextMenu == R.menu.conference_context) {
                activity.conference_context_id = acmi.position;
            } else if (mResContextMenu == R.menu.contact_context) {
                activity.contact_context_id = acmi.position;
                final Contact contact = (Contact) activity.contacts.get(acmi.position);
                final MenuItem blockUnblockItem = menu.findItem(R.id.context_contact_block_unblock);
                final MenuItem showContactDetailsItem = menu.findItem(R.id.context_contact_details);
                final MenuItem deleteContactMenuItem = menu.findItem(R.id.context_delete_contact);
                if (contact.isSelf()) {
                    showContactDetailsItem.setVisible(false);
                }
                deleteContactMenuItem.setVisible(contact.showInRoster());
                XmppConnection xmpp = contact.getAccount().getXmppConnection();
                if (xmpp != null && xmpp.getFeatures().blocking() && !contact.isSelf()) {
                    if (contact.isBlocked()) {
                        blockUnblockItem.setTitle(R.string.unblock_contact);
                    } else {
                        blockUnblockItem.setTitle(R.string.block_contact);
                    }
                } else {
                    blockUnblockItem.setVisible(false);
                }
            }
        }

        @Override
        public boolean onContextItemSelected(final MenuItem item) {
            StartConversationActivity activity = (StartConversationActivity) getActivity();
            if (activity == null) {
                return true;
            }
            switch (item.getItemId()) {
                case R.id.context_contact_details:
                    activity.openDetailsForContact();
                    break;
                case R.id.context_show_qr:
                    activity.showQrForContact();
                    break;
                case R.id.context_contact_block_unblock:
                    activity.toggleContactBlock();
                    break;
                case R.id.context_delete_contact:
                    activity.deleteContact();
                    break;
                case R.id.context_join_conference:
                    activity.openConversationForBookmark();
                    break;
                case R.id.context_share_uri:
                    activity.shareBookmarkUri();
                    break;
                case R.id.context_delete_conference:
                    activity.deleteConference();
            }
            return true;
        }
    }

    public class ListPagerAdapter extends PagerAdapter {
        FragmentManager fragmentManager;
        MyListFragment[] fragments;

        public ListPagerAdapter(FragmentManager fm) {
            fragmentManager = fm;
            fragments = new MyListFragment[2];
        }

        public void requestFocus(int pos) {
            if (fragments.length > pos) {
                fragments[pos].getListView().requestFocus();
            }
        }

        @Override
        public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
            FragmentTransaction trans = fragmentManager.beginTransaction();
            trans.remove(fragments[position]);
            trans.commit();
            fragments[position] = null;
        }

        @NonNull
        @Override
        public Fragment instantiateItem(@NonNull ViewGroup container, int position) {
            Fragment fragment = getItem(position);
            FragmentTransaction trans = fragmentManager.beginTransaction();
            trans.add(container.getId(), fragment, "fragment:" + position);
            trans.commit();
            return fragment;
        }

        @Override
        public int getCount() {
            return fragments.length;
        }

        @Override
        public boolean isViewFromObject(@NonNull View view, @NonNull Object fragment) {
            return ((Fragment) fragment).getView() == view;
        }

        @Nullable
        @Override
        public CharSequence getPageTitle(int position) {
            switch (position) {
                case 0:
                    return getResources().getString(R.string.contacts);
                case 1:
                    return getResources().getString(R.string.conferences);
                default:
                    return super.getPageTitle(position);
            }
        }

        Fragment getItem(int position) {
            if (fragments[position] == null) {
                final MyListFragment listFragment = new MyListFragment();
                if (position == 1) {
                    listFragment.setListAdapter(mConferenceAdapter);
                    listFragment.setContextMenu(R.menu.conference_context);
                    listFragment.setOnListItemClickListener((arg0, arg1, p, arg3) -> openConversationForBookmark(p));
                } else {

                    listFragment.setListAdapter(mContactsAdapter);
                    listFragment.setContextMenu(R.menu.contact_context);
                    listFragment.setOnListItemClickListener((arg0, arg1, p, arg3) -> openConversationForContact(p));
                }
                fragments[position] = listFragment;
            }
            return fragments[position];
        }
    }

    private class Invite extends XmppUri {

        public String account;

        public Invite(final Uri uri) {
            super(uri);
        }

        public Invite(final String uri) {
            super(uri);
        }

        public Invite(Uri uri, boolean safeSource) {
            super(uri, safeSource);
        }

        boolean invite() {
            if (!isJidValid()) {
                Toast.makeText(StartConversationActivity.this, R.string.invalid_jid, Toast.LENGTH_SHORT).show();
                return false;
            }
            if (getJid() != null) {
                return handleJid(this);
            }
            return false;
        }
    }
}