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.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
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.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.MenuItemCompat;
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.text.Editable;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.TextWatcher;
import android.text.style.TypefaceSpan;
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.Checkable;
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.OnRosterUpdate;
import de.pixart.messenger.ui.adapter.KnownHostsAdapter;
import de.pixart.messenger.ui.adapter.ListItemAdapter;
import de.pixart.messenger.ui.util.DelayedHintHelper;
import de.pixart.messenger.utils.XmppUri;
import de.pixart.messenger.xmpp.OnUpdateBlocklist;
import de.pixart.messenger.xmpp.XmppConnection;
import de.pixart.messenger.xmpp.jid.InvalidJidException;
import de.pixart.messenger.xmpp.jid.Jid;

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

public class StartConversationActivity extends XmppActivity implements OnRosterUpdate, OnUpdateBlocklist {

    private final int REQUEST_SYNC_CONTACTS = 0x28cf;
    private final int REQUEST_CREATE_CONFERENCE = 0x39da;
    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 List<String> mKnownHosts;
    private List<String> mKnownConferenceHosts;
    private Invite mPendingInvite = null;
    private EditText mSearchEditText;
    private AtomicBoolean mRequestedContactsPermission = new AtomicBoolean(false);
    private Dialog mCurrentDialog = null;
    private boolean mHideOfflineContacts = false;
    private MenuItem.OnActionExpandListener mOnActionExpandListener = new MenuItem.OnActionExpandListener() {

        @Override
        public boolean onMenuItemActionExpand(MenuItem item) {
            mSearchEditText.post(() -> {
                mSearchEditText.requestFocus();
                InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                imm.showSoftInput(mSearchEditText, InputMethodManager.SHOW_IMPLICIT);
            });

            return true;
        }

        @Override
        public boolean onMenuItemActionCollapse(MenuItem item) {
            hideKeyboard();
            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 TextView.OnEditorActionListener mSearchDone = new TextView.OnEditorActionListener() {
        @Override
        public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
            int pos = getSupportActionBar().getSelectedNavigationIndex();
            if (pos == 0) {
                if (contacts.size() == 1) {
                    openConversationForContact((Contact) contacts.get(0));
                    return true;
                }
            } else {
                if (conferences.size() == 1) {
                    openConversationsForBookmark((Bookmark) conferences.get(0));
                    return true;
                }
            }
            hideKeyboard();
            mListPagerAdapter.requestFocus(pos);
            return true;
        }
    };
    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 String mInitialJid;
    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 ActionBar.TabListener mTabListener = new ActionBar.TabListener() {

        @Override
        public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {
            return;
        }

        @Override
        public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
            binding.startConversationViewPager.setCurrentItem(tab.getPosition());
            onTabChanged();
        }

        @Override
        public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {
            return;
        }
    };
    private ViewPager.SimpleOnPageChangeListener mOnPageChangeListener = new ViewPager.SimpleOnPageChangeListener() {
        @Override
        public void onPageSelected(int position) {
            ActionBar actionBar = getSupportActionBar();
            if (actionBar != null) {
                actionBar.setSelectedNavigationItem(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);
    }

    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);
        this.binding.fab.setOnClickListener((v) -> {
            if (getSupportActionBar().getSelectedNavigationIndex() == 0) {
                showCreateContactDialog(null, null);
            } else {
                showCreateConferenceDialog();
            }
        });
        ActionBar actionBar = getSupportActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        ActionBar.Tab mContactsTab = actionBar.newTab().setText(R.string.contacts).setTabListener(mTabListener);
        ActionBar.Tab mConferencesTab = actionBar.newTab().setText(R.string.conferences).setTabListener(mTabListener);
        actionBar.addTab(mContactsTab);
        actionBar.addTab(mConferencesTab);

        binding.startConversationViewPager.setOnPageChangeListener(mOnPageChangeListener);
        mListPagerAdapter = new ListPagerAdapter(getSupportFragmentManager());
        binding.startConversationViewPager.setAdapter(mListPagerAdapter);

        mConferenceAdapter = new ListItemAdapter(this, conferences);
        mContactsAdapter = new ListItemAdapter(this, contacts);
        mContactsAdapter.setOnTagClickedListener(this.mOnTagClickedListener);
        this.mHideOfflineContacts = getPreferences().getBoolean("hide_offline", false);

    }

    @Override
    public void onStart() {
        super.onStart();
        final int theme = findTheme();
        if (this.mTheme != theme) {
            recreate();
        } else {
            Intent i = getIntent();
            if (i == null || !i.hasExtra(WelcomeActivity.EXTRA_INVITE_URI)) {
                askForContactsPermissions();
            }
        }
        mConferenceAdapter.refreshSettings();
        mContactsAdapter.refreshSettings();
    }

    @Override
    public void onStop() {
        if (mCurrentDialog != null) {
            mCurrentDialog.dismiss();
        }
        super.onStop();
    }

    @Override
    public void onNewIntent(Intent intent) {
        if (xmppConnectionServiceBound) {
            handleIntent(intent);
        } else {
            setIntent(intent);
        }
    }

    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);
        switchToConversation(conversation);
    }

    protected void openConversationForContact() {
        int position = contact_context_id;
        openConversationForContact(position);
    }

    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().toBareJid().toString() + "?join");
        shareIntent.setType("text/plain");
        try {
            startActivity(Intent.createChooser(shareIntent, getText(R.string.share_uri_with)));
        } 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());
        }
        switchToConversation(conversation);
    }

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

    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(getString(R.string.remove_contact_text,
                contact.getJid()));
        builder.setPositiveButton(R.string.delete, new OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int 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(getString(R.string.remove_bookmark_text,
                bookmark.getJid()));
        builder.setPositiveButton(R.string.delete, new OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int 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) {
        EnterJidDialog dialog = new EnterJidDialog(
                this, mKnownHosts, mActivatedAccounts,
                getString(R.string.create_contact), getString(R.string.create),
                prefilledJid, null, invite == null || !invite.hasFingerprints(), xmppConnectionService.multipleAccounts()
        );

        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;
            }
        });

        mCurrentDialog = dialog.show();
    }

    @SuppressLint("InflateParams")
    protected void showJoinConferenceDialog(final String prefilledJid) {
        final AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle(R.string.join_conference);
        final View dialogView = getLayoutInflater().inflate(R.layout.join_conference_dialog, null);
        final TextView yourAccount = dialogView.findViewById(R.id.your_account);
        final Spinner spinner = dialogView.findViewById(R.id.account);
        final AutoCompleteTextView jid = dialogView.findViewById(R.id.jid);
        DelayedHintHelper.setHint(R.string.conference_address_example, jid);
        jid.setAdapter(new KnownHostsAdapter(this, R.layout.simple_list_item, mKnownConferenceHosts));
        if (prefilledJid != null) {
            jid.append(prefilledJid);
        }
        if (xmppConnectionService.multipleAccounts()) {
            yourAccount.setVisibility(View.VISIBLE);
            spinner.setVisibility(View.VISIBLE);
        } else {
            yourAccount.setVisibility(View.GONE);
            spinner.setVisibility(View.GONE);
        }
        populateAccountSpinner(this, mActivatedAccounts, spinner);
        final Checkable bookmarkCheckBox = (CheckBox) dialogView
                .findViewById(R.id.bookmark);
        builder.setView(dialogView);
        builder.setNegativeButton(R.string.cancel, null);
        builder.setPositiveButton(R.string.join, null);
        final AlertDialog dialog = builder.create();
        dialog.show();
        mCurrentDialog = dialog;
        dialog.getButton(AlertDialog.BUTTON_POSITIVE).setOnClickListener(v -> {
            if (!xmppConnectionServiceBound) {
                return;
            }
            final Account account = getSelectedAccount(spinner);
            if (account == null) {
                return;
            }
            final Jid conferenceJid;
            try {
                conferenceJid = Jid.fromString(jid.getText().toString());
            } catch (final InvalidJidException e) {
                jid.setError(getString(R.string.invalid_jid));
                return;
            }

            if (bookmarkCheckBox.isChecked()) {
                if (account.hasBookmarkFor(conferenceJid)) {
                    jid.setError(getString(R.string.bookmark_already_exists));
                } else {
                    final Bookmark bookmark = new Bookmark(account, conferenceJid.toBareJid());
                    bookmark.setAutojoin(getPreferences().getBoolean("autojoin", getResources().getBoolean(R.bool.autojoin)));
                    String nick = conferenceJid.getResourcepart();
                    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();
                    mCurrentDialog = null;
                    switchToConversation(conversation);
                }
            } else {
                final Conversation conversation = xmppConnectionService.findOrCreateConversation(account, conferenceJid, true, true, true);
                dialog.dismiss();
                mCurrentDialog = null;
                switchToConversation(conversation);
            }
        });
    }

    private void showCreateConferenceDialog() {
        final AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle(R.string.create_conference);
        final View dialogView = getLayoutInflater().inflate(R.layout.create_conference_dialog, null);
        final TextView yourAccount = dialogView.findViewById(R.id.your_account);
        final Spinner spinner = dialogView.findViewById(R.id.account);
        final EditText subject = dialogView.findViewById(R.id.subject);
        populateAccountSpinner(this, mActivatedAccounts, spinner);
        if (xmppConnectionService.multipleAccounts()) {
            yourAccount.setVisibility(View.VISIBLE);
            spinner.setVisibility(View.VISIBLE);
        } else {
            yourAccount.setVisibility(View.GONE);
            spinner.setVisibility(View.GONE);
        }
        builder.setView(dialogView);
        builder.setPositiveButton(R.string.choose_participants, (dialog, which) -> {
            if (!xmppConnectionServiceBound) {
                return;
            }
            final Account account = getSelectedAccount(spinner);
            if (account == null) {
                return;
            }
            Intent intent = new Intent(getApplicationContext(), ChooseContactActivity.class);
            intent.putExtra("multiple", true);
            intent.putExtra("show_enter_jid", true);
            intent.putExtra("subject", subject.getText().toString());
            intent.putExtra(EXTRA_ACCOUNT, account.getJid().toBareJid().toString());
            intent.putExtra(ChooseContactActivity.EXTRA_TITLE_RES_ID, R.string.choose_participants);
            startActivityForResult(intent, REQUEST_CREATE_CONFERENCE);
        });
        builder.setNegativeButton(R.string.cancel, null);
        mCurrentDialog = builder.create();
        mCurrentDialog.show();
    }

    private Account getSelectedAccount(Spinner spinner) {
        if (!spinner.isEnabled()) {
            return null;
        }
        Jid jid;
        try {
            if (Config.DOMAIN_LOCK != null) {
                jid = Jid.fromParts((String) spinner.getSelectedItem(), Config.DOMAIN_LOCK, null);
            } else {
                jid = Jid.fromString((String) spinner.getSelectedItem());
            }
        } catch (final InvalidJidException 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 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.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);
        ActionBar bar = getSupportActionBar();
        joinGroupChat.setVisible(bar != null && bar.getSelectedNavigationIndex() == 1);
        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);
        if (mInitialJid != null) {
            MenuItemCompat.expandActionView(mMenuSearchView);
            mSearchEditText.append(mInitialJid);
            filter(mInitialJid);
        }
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            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 subject = intent.getStringExtra("subject");
                    List<Jid> jids = new ArrayList<>();
                    if (intent.getBooleanExtra("multiple", false)) {
                        String[] toAdd = intent.getStringArrayExtra("contacts");
                        for (String item : toAdd) {
                            try {
                                jids.add(Jid.fromString(item));
                            } catch (InvalidJidException e) {
                                //ignored
                            }
                        }
                    } else {
                        try {
                            jids.add(Jid.fromString(intent.getStringExtra("contact")));
                        } catch (Exception e) {
                            //ignored
                        }
                    }
                    if (account != null && jids.size() > 0) {
                        if (xmppConnectionService.createAdhocConference(account, subject, 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, new OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                                    requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, REQUEST_SYNC_CONTACTS);
                                }
                            }
                        });
                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
                            builder.setOnDismissListener(new DialogInterface.OnDismissListener() {
                                @Override
                                public void onDismiss(DialogInterface dialog) {
                                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                                        requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, REQUEST_SYNC_CONTACTS);
                                    }
                                }
                            });
                        }
                        builder.create().show();
                    } else {
                        requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, 0);
                    }
                }
            }
        }
    }

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

    @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().getLocalpart());
                } else {
                    this.mActivatedAccounts.add(account.getJid().toBareJid().toString());
                }
            }
        }
        final Intent intent = getIntent();
        final ActionBar ab = getSupportActionBar();
        boolean init = intent != null && intent.getBooleanExtra("init", false);
        boolean noConversations = xmppConnectionService.getConversations().size() == 0;
        if ((init || noConversations) && ab != null) {
            ab.setDisplayShowHomeEnabled(false);
            ab.setDisplayHomeAsUpEnabled(false);
            ab.setHomeButtonEnabled(false);
        }
        this.mKnownHosts = xmppConnectionService.getKnownHosts();
        this.mKnownConferenceHosts = xmppConnectionService.getKnownConferenceHosts();
        if (this.mPendingInvite != null) {
            mPendingInvite.invite();
            this.mPendingInvite = null;
            filter(null);
        } else if (!handleIntent(getIntent())) {
            if (mSearchEditText != null) {
                filter(mSearchEditText.getText().toString());
            } else {
                filter(null);
            }
        } else {
            filter(null);
        }
        setIntent(null);
    }

    protected boolean handleIntent(Intent intent) {
        if (intent == null) {
            return false;
        }
        final String inviteUri = intent.getStringExtra(WelcomeActivity.EXTRA_INVITE_URI);
        if (inviteUri != null) {
            Invite invite = new Invite(inviteUri);
            if (invite.isJidValid()) {
                return invite.invite();
            }
        }
        if (intent.getAction() == null) {
            return false;
        }
        switch (intent.getAction()) {
            case Intent.ACTION_SENDTO:
            case Intent.ACTION_VIEW:
                Uri uri = intent.getData();
                if (uri != null) {
                    Invite invite = new Invite(intent.getData(), 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().toBareJid().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 {
                mInitialJid = 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);
        String jid = contact.getJid().toBareJid().toString();
        SpannableString spannable = new SpannableString(getString(R.string.verifying_omemo_keys_trusted_source, jid, contact.getDisplayName()));
        int start = spannable.toString().indexOf(jid);
        if (start >= 0) {
            spannable.setSpan(new TypefaceSpan("monospace"), start, start + jid.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        }
        warning.setText(spannable);
        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();
        for (Account account : xmppConnectionService.getAccounts()) {
            if (account.getStatus() != Account.State.DISABLED) {
                for (Contact contact : account.getRoster().getContacts()) {
                    Presence.Status s = contact.getShownStatus();
                    if (contact.showInRoster() && 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();
    }

    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 (getSupportActionBar().getSelectedNavigationIndex() == 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());
        }
    }

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

    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);
                if (contact.isSelf()) {
                    showContactDetailsItem.setVisible(false);
                }
                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_start_conversation:
                    activity.openConversationForContact();
                    break;
                case R.id.context_contact_details:
                    activity.openDetailsForContact();
                    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) {
            assert (0 <= position && position < fragments.length);
            FragmentTransaction trans = fragmentManager.beginTransaction();
            trans.remove(fragments[position]);
            trans.commit();
            fragments[position] = null;
        }

        @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;
        }

        public Fragment getItem(int position) {
            assert (0 <= position && position < fragments.length);
            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;
        }
    }
}