package de.pixart.messenger.ui;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Fragment;
import android.app.PendingIntent;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentSender.SendIntentException;
import android.os.Bundle;
import android.os.Handler;
import android.os.SystemClock;
import android.support.v13.view.inputmethod.InputConnectionCompat;
import android.support.v13.view.inputmethod.InputContentInfoCompat;
import android.text.Editable;
import android.text.InputType;
import android.util.Log;
import android.util.Pair;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputMethodManager;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.AdapterView;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.PopupMenu;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.TextView.OnEditorActionListener;
import android.widget.Toast;

import net.java.otr4j.session.SessionStatus;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.atomic.AtomicBoolean;

import de.pixart.messenger.Config;
import de.pixart.messenger.R;
import de.pixart.messenger.crypto.axolotl.AxolotlService;
import de.pixart.messenger.entities.Account;
import de.pixart.messenger.entities.Blockable;
import de.pixart.messenger.entities.Contact;
import de.pixart.messenger.entities.Conversation;
import de.pixart.messenger.entities.DownloadableFile;
import de.pixart.messenger.entities.Message;
import de.pixart.messenger.entities.MucOptions;
import de.pixart.messenger.entities.Presence;
import de.pixart.messenger.entities.ReadByMarker;
import de.pixart.messenger.entities.Transferable;
import de.pixart.messenger.entities.TransferablePlaceholder;
import de.pixart.messenger.http.HttpDownloadConnection;
import de.pixart.messenger.persistance.FileBackend;
import de.pixart.messenger.services.MessageArchiveService;
import de.pixart.messenger.services.XmppConnectionService;
import de.pixart.messenger.ui.XmppActivity.OnPresenceSelected;
import de.pixart.messenger.ui.XmppActivity.OnValueEdited;
import de.pixart.messenger.ui.adapter.MessageAdapter;
import de.pixart.messenger.ui.adapter.MessageAdapter.OnContactPictureClicked;
import de.pixart.messenger.ui.widget.EditMessage;
import de.pixart.messenger.utils.MessageUtils;
import de.pixart.messenger.utils.NickValidityChecker;
import de.pixart.messenger.utils.StylingHelper;
import de.pixart.messenger.utils.UIHelper;
import de.pixart.messenger.xmpp.XmppConnection;
import de.pixart.messenger.xmpp.chatstate.ChatState;
import de.pixart.messenger.xmpp.jid.Jid;

import static de.pixart.messenger.xmpp.Patches.ENCRYPTION_EXCEPTIONS;

public class ConversationFragment extends Fragment implements EditMessage.KeyboardListener {

    final protected List<Message> messageList = new ArrayList<>();
    protected Conversation conversation;
    protected ListView messagesView;
    protected MessageAdapter messageListAdapter;
    private EditMessage mEditMessage;
    private ImageButton mSendButton;
    private RelativeLayout snackbar;
    private RelativeLayout messagehint;
    private TextView messagehint_message;
    private TextView snackbarMessage;
    private TextView snackbarAction;
    private Toast messageLoaderToast;
    SimpleDateFormat sdf = new SimpleDateFormat("EEEE, dd. MMM yyyy", Locale.getDefault());
    private OnClickListener clickToMuc = new OnClickListener() {

        @Override
        public void onClick(View v) {
            Intent intent = new Intent(getActivity(), ConferenceDetailsActivity.class);
            intent.setAction(ConferenceDetailsActivity.ACTION_VIEW_MUC);
            intent.putExtra("uuid", conversation.getUuid());
            startActivity(intent);
        }
    };
    private ConversationActivity activity;
    private OnClickListener leaveMuc = new OnClickListener() {

        @Override
        public void onClick(View v) {
            activity.endConversation(conversation);
        }
    };
    private OnClickListener joinMuc = new OnClickListener() {

        @Override
        public void onClick(View v) {
            activity.xmppConnectionService.joinMuc(conversation);
        }
    };
    private OnClickListener enterPassword = new OnClickListener() {

        @Override
        public void onClick(View v) {
            MucOptions muc = conversation.getMucOptions();
            String password = muc.getPassword();
            if (password == null) {
                password = "";
            }
            activity.quickPasswordEdit(password, new OnValueEdited() {

                @Override
                public String onValueEdited(String value) {
                    activity.xmppConnectionService.providePasswordForMuc(conversation, value);
                    return null;
                }
            });
        }
    };

    private OnScrollListener mOnScrollListener = new OnScrollListener() {

        @Override
        public void onScrollStateChanged(AbsListView view, int scrollState) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onScroll(final AbsListView view, int firstVisibleItem,
                             int visibleItemCount, final int totalItemCount) {
            synchronized (ConversationFragment.this.messageList) {
                if (firstVisibleItem < 25 && conversation != null && conversation.messagesLoaded.compareAndSet(true,false) && messageList.size() > 0) {
                    long timestamp;
                    if (messageList.get(0).getType() == Message.TYPE_STATUS && messageList.size() >= 2) {
                        timestamp = messageList.get(1).getTimeSent();
                    } else {
                        timestamp = messageList.get(0).getTimeSent();
                    }
                    activity.xmppConnectionService.loadMoreMessages(conversation, timestamp, new XmppConnectionService.OnMoreMessagesLoaded() {
                        @Override
                        public void onMoreMessagesLoaded(final int c, final Conversation conversation) {
                            if (ConversationFragment.this.conversation != conversation) {
                                conversation.messagesLoaded.set(true);
                                return;
                            }
                            activity.runOnUiThread(new Runnable() {
                                @Override
                                public void run() {
                                    final int oldPosition = messagesView.getFirstVisiblePosition();
                                    Message message = null;
                                    int childPos;
                                    for (childPos = 0; childPos + oldPosition < messageList.size(); ++childPos) {
                                        message = messageList.get(oldPosition + childPos);
                                        if (message.getType() != Message.TYPE_STATUS) {
                                            break;
                                        }
                                    }
                                    final String uuid = message != null ? message.getUuid() : null;
                                    View v = messagesView.getChildAt(childPos);
                                    final int pxOffset = (v == null) ? 0 : v.getTop();
                                    ConversationFragment.this.conversation.populateWithMessages(ConversationFragment.this.messageList);
                                    try {
                                        updateStatusMessages();
                                    } catch (IllegalStateException e) {
                                        Log.d(Config.LOGTAG, "caught illegal state exception while updating status messages");
                                    }
                                    messageListAdapter.notifyDataSetChanged();
                                    int pos = Math.max(getIndexOf(uuid, messageList), 0);
                                    messagesView.setSmoothScrollbarEnabled(true);
                                    messagesView.setFastScrollEnabled(false);
                                    messagesView.setSelectionFromTop(pos, pxOffset);
                                    if (messageLoaderToast != null) {
                                        messageLoaderToast.cancel();
                                    }
                                    conversation.messagesLoaded.set(true);
                                }
                            });
                        }

                        @Override
                        public void informUser(final int resId) {

                            activity.runOnUiThread(new Runnable() {
                                @Override
                                public void run() {
                                    if (messageLoaderToast != null) {
                                        messageLoaderToast.cancel();
                                    }
                                    if (ConversationFragment.this.conversation != conversation) {
                                        return;
                                    }
                                    messageLoaderToast = Toast.makeText(view.getContext(), resId, Toast.LENGTH_LONG);
                                    messageLoaderToast.show();
                                }
                            });

                        }
                    });

                }
            }
        }
    };

    protected OnClickListener clickToVerify = new OnClickListener() {
        @Override
        public void onClick(View v) {
            activity.verifyOtrSessionDialog(conversation, v);
        }
    };
    private EditMessage.OnCommitContentListener mEditorContentListener = new EditMessage.OnCommitContentListener() {
        @Override
        public boolean onCommitContent(InputContentInfoCompat inputContentInfo, int flags, Bundle opts, String[] contentMimeTypes) {
            // try to get permission to read the image, if applicable
            if ((flags & InputConnectionCompat.INPUT_CONTENT_GRANT_READ_URI_PERMISSION) != 0) {
                try {
                    inputContentInfo.requestPermission();
                } catch (Exception e) {
                    Log.e(Config.LOGTAG, "InputContentInfoCompat#requestPermission() failed.", e);
                    Toast.makeText(
                            activity,
                            activity.getString(R.string.no_permission_to_access_x, inputContentInfo.getDescription()),
                            Toast.LENGTH_LONG
                    ).show();
                    return false;
                }
            }
            if (activity.hasStoragePermission(ConversationActivity.REQUEST_ADD_EDITOR_CONTENT)) {
                activity.attachImageToConversation(inputContentInfo.getContentUri());
            } else {
                activity.mPendingEditorContent = inputContentInfo.getContentUri();
            }
            return true;
        }
    };
    private Message selectedMessage;
    private OnClickListener mEnableAccountListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            final Account account = conversation == null ? null : conversation.getAccount();
            if (account != null) {
                account.setOption(Account.OPTION_DISABLED, false);
                activity.xmppConnectionService.updateAccount(account);
            }
        }
    };
    private OnClickListener mUnblockClickListener = new OnClickListener() {
        @Override
        public void onClick(final View v) {
            v.post(new Runnable() {
                @Override
                public void run() {
                    v.setVisibility(View.INVISIBLE);
                }
            });
            if (conversation.isDomainBlocked()) {
                BlockContactDialog.show(activity, conversation);
            } else {
                activity.unblockConversation(conversation);
            }
        }
    };
    private OnClickListener mBlockClickListener = new OnClickListener() {
        @Override
        public void onClick(final View view) {
            showBlockSubmenu(view);
        }
    };

    private OnClickListener mAddBackClickListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            final Contact contact = conversation == null ? null : conversation.getContact();
            if (contact != null) {
                activity.xmppConnectionService.createContact(contact);
                activity.switchToContactDetails(contact);
            }
        }
    };
    private View.OnLongClickListener mLongPressBlockListener = new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View v) {
            showBlockSubmenu(v);
            return true;
        }
    };

    private OnClickListener mHideUnencryptionHint = new OnClickListener() {
        @Override
        public void onClick(View v) {
            if (Config.supportOmemo() && conversation.getAccount().getAxolotlService().isConversationAxolotlCapable(conversation)) {
                conversation.setNextEncryption(Message.ENCRYPTION_AXOLOTL);
                activity.xmppConnectionService.updateConversation(conversation);
                activity.refreshUi();
            }
            hideSnackbar();
        }
    };
    private OnClickListener mAllowPresenceSubscription = new OnClickListener() {
        @Override
        public void onClick(View v) {
            final Contact contact = conversation == null ? null : conversation.getContact();
            if (contact != null) {
                activity.xmppConnectionService.sendPresencePacket(contact.getAccount(),
                        activity.xmppConnectionService.getPresenceGenerator()
                                .sendPresenceUpdatesTo(contact));
                hideSnackbar();
            }
        }
    };
    private OnClickListener mAnswerSmpClickListener = new OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(activity, VerifyOTRActivity.class);
            intent.setAction(VerifyOTRActivity.ACTION_VERIFY_CONTACT);
            intent.putExtra("contact", conversation.getContact().getJid().toBareJid().toString());
            intent.putExtra(VerifyOTRActivity.EXTRA_ACCOUNT, conversation.getAccount().getJid().toBareJid().toString());
            intent.putExtra("mode", VerifyOTRActivity.MODE_ANSWER_QUESTION);
            startActivity(intent);
        }
    };

    protected OnClickListener clickToDecryptListener = new OnClickListener() {

        @Override
        public void onClick(View v) {
            PendingIntent pendingIntent = conversation.getAccount().getPgpDecryptionService().getPendingIntent();
            if (pendingIntent != null) {
                try {
                    activity.startIntentSenderForResult(pendingIntent.getIntentSender(),
                            ConversationActivity.REQUEST_DECRYPT_PGP,
                            null,
                            0,
                            0,
                            0);
                } catch (SendIntentException e) {
                    Toast.makeText(activity, R.string.unable_to_connect_to_keychain, Toast.LENGTH_SHORT).show();
                    conversation.getAccount().getPgpDecryptionService().continueDecryption(true);
                }
            }
            updateSnackBar(conversation);
        }
    };
    private AtomicBoolean mSendingPgpMessage = new AtomicBoolean(false);
    private OnEditorActionListener mEditorActionListener = new OnEditorActionListener() {

        @Override
        public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
            if (actionId == EditorInfo.IME_ACTION_SEND) {
                InputMethodManager imm = (InputMethodManager) v.getContext()
                        .getSystemService(Context.INPUT_METHOD_SERVICE);
                if (imm.isFullscreenMode()) {
                    imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
                }
                sendMessage();
                return true;
            } else {
                return false;
            }
        }
    };

    private OnClickListener mSendButtonListener = new OnClickListener() {

        @Override
        public void onClick(View v) {
            Object tag = v.getTag();
            if (tag instanceof SendButtonAction) {
                SendButtonAction action = (SendButtonAction) tag;
                switch (action) {
                    case TAKE_FROM_CAMERA:
                        activity.attachFile(ConversationActivity.ATTACHMENT_CHOICE_TAKE_FROM_CAMERA);
                        break;
                    case SEND_LOCATION:
                        activity.attachFile(ConversationActivity.ATTACHMENT_CHOICE_LOCATION);
                        break;
                    case RECORD_VOICE:
                        activity.attachFile(ConversationActivity.ATTACHMENT_CHOICE_RECORD_VOICE);
                        break;
                    case CHOOSE_PICTURE:
                        activity.attachFile(ConversationActivity.ATTACHMENT_CHOICE_CHOOSE_IMAGE);
                        break;
                    case CANCEL:
                        if (conversation != null) {
                            if (conversation.setCorrectingMessage(null)) {
                                mEditMessage.setText("");
                                mEditMessage.append(conversation.getDraftMessage());
                                conversation.setDraftMessage(null);
                            } else if (conversation.getMode() == Conversation.MODE_MULTI) {
                                conversation.setNextCounterpart(null);
                            }
                            updateChatMsgHint();
                            updateSendButton();
                            updateEditablity();
                        }
                        break;
                    default:
                        sendMessage();
                }
            } else {
                sendMessage();
            }
        }
    };
    private View.OnLongClickListener mSendButtonLongListener = new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View v) {
            final String body = mEditMessage.getText().toString();
            if (body.length() == 0) {
                mEditMessage.getText().insert(0, "/me ");
            }
            return true;
        }
    };
    private int completionIndex = 0;
    private int lastCompletionLength = 0;
    private String incomplete;
    private int lastCompletionCursor;
    private boolean firstWord = false;

    private int getIndexOf(String uuid, List<Message> messages) {
        if (uuid == null) {
            return messages.size() - 1;
        }
        for (int i = 0; i < messages.size(); ++i) {
            if (uuid.equals(messages.get(i).getUuid())) {
                return i;
            } else {
                Message next = messages.get(i);
                while (next != null && next.wasMergedIntoPrevious()) {
                    if (uuid.equals(next.getUuid())) {
                        return i;
                    }
                    next = next.next();
                }

            }
        }
        return -1;
    }

    public Pair<Integer, Integer> getScrollPosition() {
        if (this.messagesView.getCount() == 0 ||
                this.messagesView.getLastVisiblePosition() == this.messagesView.getCount() - 1) {
            return null;
        } else {
            final int pos = messagesView.getFirstVisiblePosition();
            final View view = messagesView.getChildAt(0);
            if (view == null) {
                return null;
            } else {
                return new Pair<>(pos, view.getTop());
            }
        }
    }

    public void setScrollPosition(Pair<Integer, Integer> scrollPosition) {
        if (scrollPosition != null) {
            this.messagesView.setSelectionFromTop(scrollPosition.first, scrollPosition.second);
        }
    }

    private void sendMessage() {
        final String body = mEditMessage.getText().toString();
        final Conversation conversation = this.conversation;
        if (body.length() == 0 || conversation == null) {
            return;
        }
        final Message message;
        if (conversation.getCorrectingMessage() == null) {
            message = new Message(conversation, body, conversation.getNextEncryption());
            if (conversation.getMode() == Conversation.MODE_MULTI) {
                if (conversation.getNextCounterpart() != null) {
                    message.setCounterpart(conversation.getNextCounterpart());
                    message.setType(Message.TYPE_PRIVATE);
                }
            }
        } else {
            message = conversation.getCorrectingMessage();
            message.setBody(body);
            message.setEdited(message.getUuid());
            message.setUuid(UUID.randomUUID().toString());
        }
        switch (message.getConversation().getNextEncryption()) {
            case Message.ENCRYPTION_OTR:
                sendOtrMessage(message);
                break;
            case Message.ENCRYPTION_PGP:
                sendPgpMessage(message);
                break;
            case Message.ENCRYPTION_AXOLOTL:
                if (!activity.trustKeysIfNeeded(ConversationActivity.REQUEST_TRUST_KEYS_TEXT)) {
                    sendAxolotlMessage(message);
                }
                break;
            default:
                sendPlainTextMessage(message);
        }
    }

    public void updateChatMsgHint() {
        final boolean multi = conversation.getMode() == Conversation.MODE_MULTI;
        if (conversation.getCorrectingMessage() != null) {
            this.mEditMessage.setHint(R.string.send_corrected_message);
            hideMessageHint();
        } else if (multi && conversation.getNextCounterpart() != null) {
            this.mEditMessage.setHint(getString(
                    R.string.send_private_message_to,
                    conversation.getNextCounterpart().getResourcepart()));
            showMessageHint(getString(
                    R.string.send_private_message_to,
                    conversation.getNextCounterpart().getResourcepart()));
        } else if (multi && !conversation.getMucOptions().participating()) {
            this.mEditMessage.setHint(R.string.you_are_not_participating);
            hideMessageHint();
        } else {
            this.mEditMessage.setHint(UIHelper.getMessageHint(activity, conversation));
            hideMessageHint();
            getActivity().invalidateOptionsMenu();
        }
    }

    public void setupIme() {
        if (activity != null) {
            if (activity.usingEnterKey() && activity.enterIsSend()) {
                mEditMessage.setInputType(mEditMessage.getInputType() & (~InputType.TYPE_TEXT_FLAG_MULTI_LINE));
                mEditMessage.setInputType(mEditMessage.getInputType() & (~InputType.TYPE_TEXT_VARIATION_SHORT_MESSAGE));
            } else if (activity.usingEnterKey()) {
                mEditMessage.setInputType(mEditMessage.getInputType() | InputType.TYPE_TEXT_FLAG_MULTI_LINE);
                mEditMessage.setInputType(mEditMessage.getInputType() & (~InputType.TYPE_TEXT_VARIATION_SHORT_MESSAGE));
            } else {
                mEditMessage.setInputType(mEditMessage.getInputType() | InputType.TYPE_TEXT_FLAG_MULTI_LINE);
                mEditMessage.setInputType(mEditMessage.getInputType() | InputType.TYPE_TEXT_VARIATION_SHORT_MESSAGE);
            }
        }
    }

    @Override
    public View onCreateView(final LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        final View view = inflater.inflate(R.layout.fragment_conversation, container, false);
        view.setOnClickListener(null);
        mEditMessage = view.findViewById(R.id.textinput);
        mEditMessage.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                if (activity != null) {
                    activity.hideConversationsOverview();
                }
            }
        });
        mEditMessage.addTextChangedListener(new StylingHelper.MessageEditorStyler(mEditMessage));
        mEditMessage.setOnEditorActionListener(mEditorActionListener);
        mEditMessage.setRichContentListener(new String[]{"image/*"}, mEditorContentListener);

        mSendButton = view.findViewById(R.id.textSendButton);
        mSendButton.setOnClickListener(this.mSendButtonListener);
        mSendButton.setOnLongClickListener(this.mSendButtonLongListener);

        snackbar = view.findViewById(R.id.snackbar);
        snackbarMessage = view.findViewById(R.id.snackbar_message);
        snackbarAction = view.findViewById(R.id.snackbar_action);

        messagehint = view.findViewById(R.id.messagehint);
        messagehint_message = view.findViewById(R.id.messagehint_message);

        messagesView = view.findViewById(R.id.messages_view);
        messagesView.setOnScrollListener(mOnScrollListener);
        messagesView.setTranscriptMode(ListView.TRANSCRIPT_MODE_NORMAL);
        messageListAdapter = new MessageAdapter((ConversationActivity) getActivity(), this.messageList);
        messageListAdapter.setOnContactPictureClicked(new OnContactPictureClicked() {

            @Override
            public void onContactPictureClicked(Message message) {
                if (message.getStatus() <= Message.STATUS_RECEIVED) {
                    if (message.getConversation().getMode() == Conversation.MODE_MULTI) {
                        Jid user = message.getCounterpart();
                        if (user != null && !user.isBareJid()) {
                            if (!message.getConversation().getMucOptions().isUserInRoom(user)) {
                                Toast.makeText(activity, activity.getString(R.string.user_has_left_conference, user.getResourcepart()), Toast.LENGTH_SHORT).show();
                            }
                            highlightInConference(user.getResourcepart());
                        }
                    } else {
                        if (!message.getContact().isSelf()) {
                            String fingerprint;
                            if (message.getEncryption() == Message.ENCRYPTION_PGP
                                    || message.getEncryption() == Message.ENCRYPTION_DECRYPTED) {
                                fingerprint = "pgp";
                            } else {
                                fingerprint = message.getFingerprint();
                            }
                            activity.switchToContactDetails(message.getContact(), fingerprint);
                        }
                    }
                } else {
                    Account account = message.getConversation().getAccount();
                    Intent intent;
                    if (activity.manuallyChangePresence()) {
                        intent = new Intent(activity, SetPresenceActivity.class);
                        intent.putExtra(SetPresenceActivity.EXTRA_ACCOUNT, account.getJid().toBareJid().toString());
                    } else {
                        intent = new Intent(activity, EditAccountActivity.class);
                        intent.putExtra("jid", account.getJid().toBareJid().toString());
                        String fingerprint;
                        if (message.getEncryption() == Message.ENCRYPTION_PGP
                                || message.getEncryption() == Message.ENCRYPTION_DECRYPTED) {
                            fingerprint = "pgp";
                        } else if (message.getEncryption() == Message.ENCRYPTION_OTR) {
                            fingerprint = "otr";
                        } else {
                            fingerprint = message.getFingerprint();
                        }
                        intent.putExtra("fingerprint", fingerprint);
                    }
                    startActivity(intent);
                }
            }
        });
        messageListAdapter.setOnContactPictureLongClicked(message -> {
            if (message.getStatus() <= Message.STATUS_RECEIVED) {
                if (message.getConversation().getMode() == Conversation.MODE_MULTI) {
                    final MucOptions mucOptions = conversation.getMucOptions();
                    if (!mucOptions.allowPm()) {
                        Toast.makeText(activity, R.string.private_messages_are_disabled, Toast.LENGTH_SHORT).show();
                        return;
                    }
                    Jid user = message.getCounterpart();
                    if (user != null && !user.isBareJid()) {
                        if (mucOptions.isUserInRoom(user)) {
                            privateMessageWith(user);
                        } else {
                            Toast.makeText(activity, activity.getString(R.string.user_has_left_conference, user.getResourcepart()), Toast.LENGTH_SHORT).show();
                        }
                    }
                }
            } else {
                activity.showQrCode();
            }
        });
        messageListAdapter.setOnQuoteListener(text -> quoteText(text));
        messagesView.setAdapter(messageListAdapter);

        registerForContextMenu(messagesView);

        return view;
    }

    private void quoteText(String text) {
        if (mEditMessage.isEnabled()) {
            text = text.replaceAll("(\n *){2,}", "\n").replaceAll("(^|\n)", "$1> ").replaceAll("\n$", "");
            Editable editable = mEditMessage.getEditableText();
            int position = mEditMessage.getSelectionEnd();
            if (position == -1) position = editable.length();
            if (position > 0 && editable.charAt(position - 1) != '\n') {
                editable.insert(position++, "\n");
            }
            editable.insert(position, text);
            position += text.length();
            editable.insert(position++, "\n");
            if (position < editable.length() && editable.charAt(position) != '\n') {
                editable.insert(position, "\n");
            }
            mEditMessage.setSelection(position);
            mEditMessage.requestFocus();
            InputMethodManager inputMethodManager = (InputMethodManager) getActivity()
                    .getSystemService(Context.INPUT_METHOD_SERVICE);
            if (inputMethodManager != null) {
                inputMethodManager.showSoftInput(mEditMessage, InputMethodManager.SHOW_IMPLICIT);
            }
        }
    }

    private void quoteMessage(Message message) {
        quoteText(MessageUtils.prepareQuote(message));
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
        synchronized (this.messageList) {
            super.onCreateContextMenu(menu, v, menuInfo);
            AdapterView.AdapterContextMenuInfo acmi = (AdapterContextMenuInfo) menuInfo;
            this.selectedMessage = this.messageList.get(acmi.position);
            populateContextMenu(menu);
        }
    }

    private void populateContextMenu(ContextMenu menu) {
        final Message m = this.selectedMessage;
        final Transferable t = m.getTransferable();
        Message relevantForCorrection = m;
        while (relevantForCorrection.mergeable(relevantForCorrection.next())) {
            relevantForCorrection = relevantForCorrection.next();
        }
        if (m.getType() != Message.TYPE_STATUS) {
            final boolean treatAsFile = m.getType() != Message.TYPE_TEXT
                    && m.getType() != Message.TYPE_PRIVATE
                    && t == null;
            final boolean encrypted = m.getEncryption() == Message.ENCRYPTION_DECRYPTION_FAILED
                    || m.getEncryption() == Message.ENCRYPTION_PGP;
            activity.getMenuInflater().inflate(R.menu.message_context, menu);
            menu.setHeaderTitle(R.string.message_options);
            MenuItem copyMessage = menu.findItem(R.id.copy_message);
            MenuItem quoteMessage = menu.findItem(R.id.quote_message);
            MenuItem retryDecryption = menu.findItem(R.id.retry_decryption);
            MenuItem correctMessage = menu.findItem(R.id.correct_message);
            MenuItem shareWith = menu.findItem(R.id.share_with);
            MenuItem sendAgain = menu.findItem(R.id.send_again);
            MenuItem copyUrl = menu.findItem(R.id.copy_url);
            MenuItem cancelTransmission = menu.findItem(R.id.cancel_transmission);
            MenuItem downloadFile = menu.findItem(R.id.download_file);
            MenuItem deleteFile = menu.findItem(R.id.delete_file);
            MenuItem showErrorMessage = menu.findItem(R.id.show_error_message);
            if (!treatAsFile && !encrypted && !m.isGeoUri() && !m.treatAsDownloadable()) {
                copyMessage.setVisible(true);
                quoteMessage.setVisible(MessageUtils.prepareQuote(m).length() > 0);
            }
            if (m.getEncryption() == Message.ENCRYPTION_DECRYPTION_FAILED) {
                retryDecryption.setVisible(true);
            }
            if (relevantForCorrection.getType() == Message.TYPE_TEXT
                    && relevantForCorrection.isLastCorrectableMessage()
                    && (m.getConversation().getMucOptions().nonanonymous() || m.getConversation().getMode() == Conversation.MODE_SINGLE)) {
                correctMessage.setVisible(true);
            }
            if (treatAsFile || (m.getType() == Message.TYPE_TEXT && !m.treatAsDownloadable())) {
                shareWith.setVisible(true);

            }
            if (m.getStatus() == Message.STATUS_SEND_FAILED && !m.isFileOrImage()) {
                sendAgain.setVisible(true);
            }
            if (m.hasFileOnRemoteHost()
                    || m.isGeoUri()
                    || m.isXmppUri()
                    || m.treatAsDownloadable()
                    || (t != null && t instanceof HttpDownloadConnection)) {
                copyUrl.setVisible(true);
            }
            if ((m.isFileOrImage() && t instanceof TransferablePlaceholder && m.hasFileOnRemoteHost())) {
                downloadFile.setVisible(true);
                downloadFile.setTitle(activity.getString(R.string.download_x_file, UIHelper.getFileDescriptionString(activity, m)));
            }
            boolean waitingOfferedSending = m.getStatus() == Message.STATUS_WAITING
                    || m.getStatus() == Message.STATUS_UNSEND
                    || m.getStatus() == Message.STATUS_OFFERED;
            if ((t != null && !(t instanceof TransferablePlaceholder)) || waitingOfferedSending && m.needsUploading()) {
                cancelTransmission.setVisible(true);
            }
            if (treatAsFile) {
                String path = m.getRelativeFilePath();
                Log.d(Config.LOGTAG, "Path = " + path);
                if (path == null || !path.startsWith("/") || path.contains(FileBackend.getConversationsDirectory("null", false))) {
                    deleteFile.setVisible(true);
                    deleteFile.setTitle(activity.getString(R.string.delete_x_file, UIHelper.getFileDescriptionString(activity, m)));
                }
            }
            if (m.getStatus() == Message.STATUS_SEND_FAILED && m.getErrorMessage() != null) {
                showErrorMessage.setVisible(true);
            }
        }
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.share_with:
                shareWith(selectedMessage);
                return true;
            case R.id.correct_message:
                correctMessage(selectedMessage);
                return true;
            case R.id.copy_message:
                copyMessage(selectedMessage);
                return true;
            case R.id.quote_message:
                quoteMessage(selectedMessage);
                return true;
            case R.id.send_again:
                resendMessage(selectedMessage);
                return true;
            case R.id.copy_url:
                copyUrl(selectedMessage);
                return true;
            case R.id.download_file:
                downloadFile(selectedMessage);
                return true;
            case R.id.cancel_transmission:
                cancelTransmission(selectedMessage);
                return true;
            case R.id.retry_decryption:
                retryDecryption(selectedMessage);
                return true;
            case R.id.delete_file:
                deleteFile(selectedMessage);
                return true;
            case R.id.show_error_message:
                showErrorMessage(selectedMessage);
                return true;
            default:
                return super.onContextItemSelected(item);
        }
    }

    private void showErrorMessage(final Message message) {
        AlertDialog.Builder builder = new AlertDialog.Builder(activity);
        builder.setTitle(R.string.error_message);
        builder.setMessage(message.getErrorMessage());
        builder.setPositiveButton(R.string.ok, null);
        builder.create().show();
    }

    private void shareWith(Message message) {
        Intent shareIntent = new Intent();
        shareIntent.setAction(Intent.ACTION_SEND);
        if (message.isGeoUri() || message.isXmppUri()) {
            shareIntent.putExtra(Intent.EXTRA_TEXT, message.getBody());
            shareIntent.setType("text/plain");
        } else if (!message.isFileOrImage()) {
            shareIntent.putExtra(Intent.EXTRA_TEXT, message.getMergedBody().toString());
            shareIntent.setType("text/plain");
        } else {
            final DownloadableFile file = activity.xmppConnectionService.getFileBackend().getFile(message);
            try {
                shareIntent.putExtra(Intent.EXTRA_STREAM, FileBackend.getUriForFile(activity, file));
            } catch (SecurityException e) {
                Toast.makeText(activity, activity.getString(R.string.no_permission_to_access_x, file.getAbsolutePath()), Toast.LENGTH_SHORT).show();
                return;
            }
            shareIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            String mime = message.getMimeType();
            if (mime == null) {
                mime = "*/*";
            }
            shareIntent.setType(mime);
        }
        try {
            activity.startActivity(Intent.createChooser(shareIntent, getText(R.string.share_with)));
        } catch (ActivityNotFoundException e) {
            //This should happen only on faulty androids because normally chooser is always available
            Toast.makeText(activity, R.string.no_application_found_to_open_file, Toast.LENGTH_SHORT).show();
        }
    }

    private void copyMessage(Message message) {
        if (activity.copyTextToClipboard(message.getMergedBody().toString(), R.string.message)) {
            Toast.makeText(activity, R.string.message_copied_to_clipboard, Toast.LENGTH_SHORT).show();
        }
    }

    private void deleteFile(Message message) {
        if (activity.xmppConnectionService.getFileBackend().deleteFile(message)) {
            message.setTransferable(new TransferablePlaceholder(Transferable.STATUS_DELETED));
            activity.updateConversationList();
            updateMessages();
        }
    }

    public void resendMessage(final Message message) {
        if (message.isFileOrImage()) {
            DownloadableFile file = activity.xmppConnectionService.getFileBackend().getFile(message);
            if (file.exists()) {
                final Conversation conversation = message.getConversation();
                final XmppConnection xmppConnection = conversation.getAccount().getXmppConnection();
                if (!message.hasFileOnRemoteHost()
                        && xmppConnection != null
                        && !xmppConnection.getFeatures().httpUpload(message.getFileParams().size)) {
                    activity.selectPresence(conversation, new OnPresenceSelected() {
                        @Override
                        public void onPresenceSelected() {
                            message.setCounterpart(conversation.getNextCounterpart());
                            activity.xmppConnectionService.resendFailedMessages(message);
                        }
                    });
                    return;
                }
            } else {
                Toast.makeText(activity, R.string.file_deleted, Toast.LENGTH_SHORT).show();
                message.setTransferable(new TransferablePlaceholder(Transferable.STATUS_DELETED));
                activity.updateConversationList();
                updateMessages();
                return;
            }
        }
        activity.xmppConnectionService.resendFailedMessages(message);
    }

    private void copyUrl(Message message) {
        final String url;
        final int resId;
        if (message.isGeoUri()) {
            resId = R.string.location;
            url = message.getBody();
        } else if (message.isXmppUri()) {
            resId = R.string.contact;
            url = message.getBody();
        } else if (message.hasFileOnRemoteHost()) {
            resId = R.string.file_url;
            url = message.getFileParams().url.toString();
        } else {
            url = message.getBody().trim();
            resId = R.string.file_url;
        }
        if (activity.copyTextToClipboard(url, resId)) {
            Toast.makeText(activity, R.string.url_copied_to_clipboard,
                    Toast.LENGTH_SHORT).show();
        }
    }

    private void downloadFile(Message message) {
        activity.xmppConnectionService.getHttpConnectionManager().createNewDownloadConnection(message, true);
    }

    private void cancelTransmission(Message message) {
        Transferable transferable = message.getTransferable();
        if (transferable != null) {
            transferable.cancel();
        } else if (message.getStatus() != Message.STATUS_RECEIVED) {
            activity.xmppConnectionService.markMessage(message, Message.STATUS_SEND_FAILED);
        }
    }

    private void retryDecryption(Message message) {
        message.setEncryption(Message.ENCRYPTION_PGP);
        activity.updateConversationList();
        updateMessages();
        conversation.getAccount().getPgpDecryptionService().decrypt(message, false);
    }

    protected void privateMessageWith(final Jid counterpart) {
        if (conversation.setOutgoingChatState(Config.DEFAULT_CHATSTATE)) {
            activity.xmppConnectionService.sendChatState(conversation);
        }
        this.mEditMessage.setText("");
        this.conversation.setNextCounterpart(counterpart);
        updateChatMsgHint();
        updateSendButton();
        updateEditablity();
    }

    private void correctMessage(Message message) {
        while (message.mergeable(message.next())) {
            message = message.next();
        }
        this.conversation.setCorrectingMessage(message);
        final Editable editable = mEditMessage.getText();
        this.conversation.setDraftMessage(editable.toString());
        this.mEditMessage.setText("");
        this.mEditMessage.append(message.getBody());

    }

    protected void highlightInConference(String nick) {
        final Editable editable = mEditMessage.getText();
        String oldString = editable.toString().trim();
        final int pos = mEditMessage.getSelectionStart();
        if (oldString.isEmpty() || pos == 0) {
            editable.insert(0, nick + ": ");
        } else {
            final char before = editable.charAt(pos - 1);
            final char after = editable.length() > pos ? editable.charAt(pos) : '\0';
            if (before == '\n') {
                editable.insert(pos, nick + ": ");
            } else {
                if (pos > 2 && editable.subSequence(pos - 2, pos).toString().equals(": ")) {
                    if (NickValidityChecker.check(conversation, Arrays.asList(editable.subSequence(0, pos - 2).toString().split(", ")))) {
                        editable.insert(pos - 2, ", " + nick);
                        return;
                    }
                }
                editable.insert(pos, (Character.isWhitespace(before) ? "" : " ") + nick + (Character.isWhitespace(after) ? "" : " "));
                if (Character.isWhitespace(after)) {
                    mEditMessage.setSelection(mEditMessage.getSelectionStart() + 1);
                }
            }
        }
    }

    @Override
    public void onStop() {
        super.onStop();
        if (activity == null || !activity.isChangingConfigurations()) {
            messageListAdapter.stopAudioPlayer();
        }
        if (this.conversation != null) {
            final String msg = mEditMessage.getText().toString();
            if (this.conversation.setNextMessage(msg)) {
                activity.xmppConnectionService.updateConversation(this.conversation);
            }
            updateChatState(this.conversation, msg);
        }
    }

    private void updateChatState(final Conversation conversation, final String msg) {
        ChatState state = msg.length() == 0 ? Config.DEFAULT_CHATSTATE : ChatState.PAUSED;
        Account.State status = conversation.getAccount().getStatus();
        if (status == Account.State.ONLINE && conversation.setOutgoingChatState(state)) {
            activity.xmppConnectionService.sendChatState(conversation);
        }
    }

    public boolean reInit(Conversation conversation) {
        if (conversation == null) {
            return false;
        }
        this.activity = (ConversationActivity) getActivity();
        setupIme();
        if (this.conversation != null) {
            final String msg = mEditMessage.getText().toString();
            if (this.conversation.setNextMessage(msg)) {
                activity.xmppConnectionService.updateConversation(conversation);
            }
            if (this.conversation != conversation) {
                updateChatState(this.conversation, msg);
                messageListAdapter.stopAudioPlayer();
            }
            this.conversation.trim();
        }

        if (activity != null) {
            this.mSendButton.setContentDescription(activity.getString(R.string.send_message_to_x, conversation.getName()));
        }

        this.conversation = conversation;
        this.mEditMessage.setKeyboardListener(null);
        this.mEditMessage.setText("");
        this.mEditMessage.append(this.conversation.getNextMessage());
        this.mEditMessage.setKeyboardListener(this);
        messageListAdapter.updatePreferences();
        this.messagesView.setAdapter(messageListAdapter);
        updateMessages();
        this.conversation.messagesLoaded.set(true);
        synchronized (this.messageList) {
            final Message first = conversation.getFirstUnreadMessage();
            final int bottom = Math.max(0, this.messageList.size() - 1);
            final int pos;
            if (first == null) {
                pos = bottom;
            } else {
                int i = getIndexOf(first.getUuid(), this.messageList);
                pos = i < 0 ? bottom : i;
            }
            messagesView.setSelection(pos);
            return pos == bottom;
        }
    }

    private void showBlockSubmenu(View view) {
        final Jid jid = conversation.getJid();
        if (jid.isDomainJid()) {
            BlockContactDialog.show(activity, conversation);
        } else {
            PopupMenu popupMenu = new PopupMenu(activity, view);
            popupMenu.inflate(R.menu.block);
            popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
                @Override
                public boolean onMenuItemClick(MenuItem menuItem) {
                    Blockable blockable;
                    switch (menuItem.getItemId()) {
                        case R.id.block_domain:
                            blockable = conversation.getAccount().getRoster().getContact(jid.toDomainJid());
                            break;
                        default:
                            blockable = conversation;
                    }
                    BlockContactDialog.show(activity, blockable);
                    return true;
                }
            });
            popupMenu.show();
        }
    }

    private void updateSnackBar(final Conversation conversation) {
        final Account account = conversation.getAccount();
        final XmppConnection connection = account.getXmppConnection();
        final Contact contact = conversation.getContact();
        final int mode = conversation.getMode();
        if (account.getStatus() == Account.State.DISABLED) {
            showSnackbar(R.string.this_account_is_disabled, R.string.enable, this.mEnableAccountListener);
        } else if (conversation.isBlocked()) {
            showSnackbar(R.string.contact_blocked, R.string.unblock, this.mUnblockClickListener);
        } else if (!contact.showInRoster() && contact.getOption(Contact.Options.PENDING_SUBSCRIPTION_REQUEST)) {
            showSnackbar(R.string.contact_added_you, R.string.add_back, this.mAddBackClickListener, this.mLongPressBlockListener);
        } else if (contact.getOption(Contact.Options.PENDING_SUBSCRIPTION_REQUEST)) {
            showSnackbar(R.string.contact_asks_for_presence_subscription, R.string.allow, this.mAllowPresenceSubscription, this.mLongPressBlockListener);
        } else if (mode == Conversation.MODE_MULTI
                && !conversation.getMucOptions().online()
                && account.getStatus() == Account.State.ONLINE) {
            switch (conversation.getMucOptions().getError()) {
                case NICK_IN_USE:
                    showSnackbar(R.string.nick_in_use, R.string.edit, clickToMuc);
                    break;
                case NO_RESPONSE:
                    showSnackbar(R.string.joining_conference, 0, null);
                    break;
                case SERVER_NOT_FOUND:
                    if (conversation.receivedMessagesCount() > 0) {
                        showSnackbar(R.string.remote_server_not_found, R.string.try_again, joinMuc);
                    } else {
                        showSnackbar(R.string.remote_server_not_found, R.string.leave, leaveMuc);
                    }
                    break;
                case PASSWORD_REQUIRED:
                    showSnackbar(R.string.conference_requires_password, R.string.enter_password, enterPassword);
                    break;
                case BANNED:
                    showSnackbar(R.string.conference_banned, R.string.leave, leaveMuc);
                    break;
                case MEMBERS_ONLY:
                    showSnackbar(R.string.conference_members_only, R.string.leave, leaveMuc);
                    break;
                case KICKED:
                    showSnackbar(R.string.conference_kicked, R.string.join, joinMuc);
                    break;
                case UNKNOWN:
                    showSnackbar(R.string.conference_unknown_error, R.string.leave, leaveMuc);
                    break;
                case INVALID_NICK:
                    showSnackbar(R.string.invalid_muc_nick, R.string.edit, clickToMuc);
                case SHUTDOWN:
                    showSnackbar(R.string.conference_shutdown, R.string.try_again, joinMuc);
                    break;
                default:
                    hideSnackbar();
                    break;
            }
        } else if (account.hasPendingPgpIntent(conversation)) {
            showSnackbar(R.string.openpgp_messages_found, R.string.decrypt, clickToDecryptListener);
        } else if (mode == Conversation.MODE_SINGLE
                && conversation.smpRequested()) {
            showSnackbar(R.string.smp_requested, R.string.verify, this.mAnswerSmpClickListener);
        } else if (mode == Conversation.MODE_SINGLE
                && conversation.hasValidOtrSession()
                && (conversation.getOtrSession().getSessionStatus() == SessionStatus.ENCRYPTED)
                && (!conversation.isOtrFingerprintVerified())) {
            showSnackbar(R.string.unknown_otr_fingerprint, R.string.verify, clickToVerify);
        } else if (connection != null
                && connection.getFeatures().blocking()
                && conversation.countMessages() != 0
                && !conversation.isBlocked()
                && conversation.isWithStranger()) {
            showSnackbar(R.string.received_message_from_stranger, R.string.block, mBlockClickListener);
        } else if (activity.xmppConnectionService.warnUnecryptedChat()) {
            AxolotlService axolotlService = account.getAxolotlService();
            if ((mode == Conversation.MODE_SINGLE) && (conversation.getNextEncryption() == Message.ENCRYPTION_NONE &&
                    ((Config.supportOmemo() && axolotlService != null && conversation.getAccount().getAxolotlService().isConversationAxolotlCapable(conversation)) ||
                            (Config.supportOpenPgp() && account.isPgpDecryptionServiceConnected()) ||
                            Config.supportOtr()))) {
                if (ENCRYPTION_EXCEPTIONS.contains(conversation.getJid().toString()) || conversation.getJid().toString().equals(account.getJid().getDomainpart())) {
                    hideSnackbar();
                } else {
                    showSnackbar(R.string.conversation_unencrypted_hint, R.string.ok, mHideUnencryptionHint, null);
                }
            } else if ((mode == Conversation.MODE_MULTI && conversation.getMucOptions().membersOnly() && conversation.getMucOptions().nonanonymous()) &&
                    (conversation.getNextEncryption() == Message.ENCRYPTION_NONE &&
                            ((Config.supportOmemo() && axolotlService != null && conversation.getAccount().getAxolotlService().isConversationAxolotlCapable(conversation)) ||
                                    (Config.supportOpenPgp() && account.isPgpDecryptionServiceConnected())))) {
                if (ENCRYPTION_EXCEPTIONS.contains(conversation.getJid().toString()) || conversation.getJid().toString().equals(account.getJid().getDomainpart())) {
                    Log.d(Config.LOGTAG, "Don't show unencrypted warning because " + conversation.getJid().toString() + " is on exception list");
                    hideSnackbar();
                } else {
                    showSnackbar(R.string.conversation_unencrypted_hint, R.string.ok, mHideUnencryptionHint, null);
                }
            } else {
                hideSnackbar();
            }
        } else {
            hideSnackbar();
        }
    }

    public void updateMessages() {
        synchronized (this.messageList) {
            if (getView() == null) {
                return;
            }
            final ConversationActivity activity = (ConversationActivity) getActivity();
            if (this.conversation != null) {
                conversation.populateWithMessages(ConversationFragment.this.messageList);
                updateSnackBar(conversation);
                updateStatusMessages();
                this.messageListAdapter.notifyDataSetChanged();
                updateChatMsgHint();
                if (!activity.isConversationsOverviewVisable() || !activity.isConversationsOverviewHideable()) {
                    activity.sendReadMarkerIfNecessary(conversation);
                }
                updateSendButton();
                updateEditablity();
            }
        }
    }

    protected void messageSent() {
        mSendingPgpMessage.set(false);
        mEditMessage.setText("");
        if (conversation.setCorrectingMessage(null)) {
            mEditMessage.append(conversation.getDraftMessage());
            conversation.setDraftMessage(null);
        }
        if (conversation.setNextMessage(mEditMessage.getText().toString())) {
            activity.xmppConnectionService.updateConversation(conversation);
        }
        updateChatMsgHint();
        new Handler().post(new Runnable() {
            @Override
            public void run() {
                int size = messageList.size();
                messagesView.setSelection(size - 1);
            }
        });
    }

    public void setFocusOnInputField() {
        mEditMessage.requestFocus();
    }

    public void doneSendingPgpMessage() {
        mSendingPgpMessage.set(false);
    }

    private int getSendButtonImageResource(SendButtonAction action, Presence.Status status) {
        switch (action) {
            case TEXT:
                switch (status) {
                    case CHAT:
                    case ONLINE:
                        return R.drawable.ic_send_text_online;
                    case AWAY:
                        return R.drawable.ic_send_text_away;
                    case XA:
                    case DND:
                        return R.drawable.ic_send_text_dnd;
                    default:
                        return R.drawable.ic_send_text_offline;
                }
            case TAKE_FROM_CAMERA:
                switch (status) {
                    case CHAT:
                    case ONLINE:
                        return R.drawable.ic_send_photo_online;
                    case AWAY:
                        return R.drawable.ic_send_photo_away;
                    case XA:
                    case DND:
                        return R.drawable.ic_send_photo_dnd;
                    default:
                        return R.drawable.ic_send_photo_offline;
                }
            case RECORD_VOICE:
                switch (status) {
                    case CHAT:
                    case ONLINE:
                        return R.drawable.ic_send_voice_online;
                    case AWAY:
                        return R.drawable.ic_send_voice_away;
                    case XA:
                    case DND:
                        return R.drawable.ic_send_voice_dnd;
                    default:
                        return R.drawable.ic_send_voice_offline;
                }
            case SEND_LOCATION:
                switch (status) {
                    case CHAT:
                    case ONLINE:
                        return R.drawable.ic_send_location_online;
                    case AWAY:
                        return R.drawable.ic_send_location_away;
                    case XA:
                    case DND:
                        return R.drawable.ic_send_location_dnd;
                    default:
                        return R.drawable.ic_send_location_offline;
                }
            case CANCEL:
                switch (status) {
                    case CHAT:
                    case ONLINE:
                        return R.drawable.ic_send_cancel_online;
                    case AWAY:
                        return R.drawable.ic_send_cancel_away;
                    case XA:
                    case DND:
                        return R.drawable.ic_send_cancel_dnd;
                    default:
                        return R.drawable.ic_send_cancel_offline;
                }
            case CHOOSE_PICTURE:
                switch (status) {
                    case CHAT:
                    case ONLINE:
                        return R.drawable.ic_send_picture_online;
                    case AWAY:
                        return R.drawable.ic_send_picture_away;
                    case XA:
                    case DND:
                        return R.drawable.ic_send_picture_dnd;
                    default:
                        return R.drawable.ic_send_picture_offline;
                }
        }
        return R.drawable.ic_send_text_offline;
    }

    private void updateEditablity() {
        boolean canWrite = this.conversation.getMode() == Conversation.MODE_SINGLE || this.conversation.getMucOptions().participating() || this.conversation.getNextCounterpart() != null;
        this.mEditMessage.setFocusable(canWrite);
        this.mEditMessage.setFocusableInTouchMode(canWrite);
        this.mSendButton.setEnabled(canWrite);
        this.mEditMessage.setCursorVisible(canWrite);
    }

    public void updateSendButton() {
        final Conversation c = this.conversation;
        final SendButtonAction action;
        final Presence.Status status;
        final String text = this.mEditMessage == null ? "" : this.mEditMessage.getText().toString();
        final boolean empty = text.length() == 0;
        final boolean conference = c.getMode() == Conversation.MODE_MULTI;
        if (c.getCorrectingMessage() != null && (empty || text.equals(c.getCorrectingMessage().getBody()))) {
            action = SendButtonAction.CANCEL;
        } else if (conference && !c.getAccount().httpUploadAvailable()) {
            if (empty && c.getNextCounterpart() != null) {
                action = SendButtonAction.CANCEL;
            } else {
                action = SendButtonAction.TEXT;
            }
        } else {
            if (empty) {
                if (conference && c.getNextCounterpart() != null) {
                    action = SendButtonAction.CANCEL;
                } else {
                    String setting = activity.getPreferences().getString("quick_action", activity.getResources().getString(R.string.quick_action));
                    if (!setting.equals("none") && UIHelper.receivedLocationQuestion(conversation.getLatestMessage())) {
                        setting = "location";
                    } else if (setting.equals("recent")) {
                        setting = activity.getPreferences().getString("recently_used_quick_action", "text");
                    }
                    switch (setting) {
                        case "photo":
                            action = SendButtonAction.TAKE_FROM_CAMERA;
                            break;
                        case "location":
                            action = SendButtonAction.SEND_LOCATION;
                            break;
                        case "voice":
                            action = SendButtonAction.RECORD_VOICE;
                            break;
                        case "picture":
                            action = SendButtonAction.CHOOSE_PICTURE;
                            break;
                        default:
                            action = SendButtonAction.TEXT;
                            break;
                    }
                }
            } else {
                action = SendButtonAction.TEXT;
            }
        }
        if (activity.useSendButtonToIndicateStatus() && c.getAccount().getStatus() == Account.State.ONLINE) {
            if (activity.xmppConnectionService != null && activity.xmppConnectionService.getMessageArchiveService().isCatchingUp(c)) {
                status = Presence.Status.OFFLINE;
            } else if (c.getMode() == Conversation.MODE_SINGLE) {
                status = c.getContact().getShownStatus();
            } else {
                status = c.getMucOptions().online() ? Presence.Status.ONLINE : Presence.Status.OFFLINE;
            }
        } else {
            status = Presence.Status.OFFLINE;
        }
        this.mSendButton.setTag(action);
        this.mSendButton.setImageResource(getSendButtonImageResource(action, status));
    }

    protected void updateStatusMessages() {
        updateDateBubbles();
        synchronized (this.messageList) {
            if (showLoadMoreMessages(conversation)) {
                this.messageList.add(0, Message.createLoadMoreMessage(conversation));
            }
            if (conversation.getMode() == Conversation.MODE_MULTI) {
                final MucOptions mucOptions = conversation.getMucOptions();
                final List<MucOptions.User> allUsers = mucOptions.getUsers();
                final Set<ReadByMarker> addedMarkers = new HashSet<>();
                ChatState state = ChatState.COMPOSING;
                List<MucOptions.User> users = conversation.getMucOptions().getUsersWithChatState(state, 5);
                if (users.size() == 0) {
                    state = ChatState.PAUSED;
                    users = conversation.getMucOptions().getUsersWithChatState(state, 5);
                }
                if (mucOptions.isPrivateAndNonAnonymous()) {
                    for (int i = this.messageList.size() - 1; i >= 0; --i) {
                        final Set<ReadByMarker> markersForMessage = messageList.get(i).getReadByMarkers();
                        final List<MucOptions.User> shownMarkers = new ArrayList<>();
                        for (ReadByMarker marker : markersForMessage) {
                            if (!ReadByMarker.contains(marker, addedMarkers)) {
                                addedMarkers.add(marker); //may be put outside this condition. set should do dedup anyway
                                MucOptions.User user = mucOptions.findUser(marker);
                                if (user != null && !users.contains(user)) {
                                    shownMarkers.add(user);
                                }
                            }
                        }
                        final ReadByMarker markerForSender = ReadByMarker.from(messageList.get(i));
                        final Message statusMessage;
                        final int size = shownMarkers.size();
                        if (size > 1) {
                            final String body;
                            if (size <= 4) {
                                body = getString(R.string.contacts_have_read_up_to_this_point, UIHelper.concatNames(shownMarkers));
                            } else {
                                body = getString(R.string.contacts_and_n_more_have_read_up_to_this_point, UIHelper.concatNames(shownMarkers, 3), size - 3);
                            }
                            statusMessage = Message.createStatusMessage(conversation, body);
                            statusMessage.setCounterparts(shownMarkers);
                        } else if (size == 1) {
                            statusMessage = Message.createStatusMessage(conversation, getString(R.string.contact_has_read_up_to_this_point, UIHelper.getDisplayName(shownMarkers.get(0))));
                            statusMessage.setCounterpart(shownMarkers.get(0).getFullJid());
                            statusMessage.setTrueCounterpart(shownMarkers.get(0).getRealJid());
                        } else {
                            statusMessage = null;
                        }
                        if (statusMessage != null) {
                            this.messageList.add(i + 1, statusMessage);
                        }
                        addedMarkers.add(markerForSender);
                        if (ReadByMarker.allUsersRepresented(allUsers, addedMarkers)) {
                            break;
                        }
                    }
                }
            }
        }
    }

    protected void updateDateBubbles() {
        synchronized (this.messageList) {
            for (int i = 0; i < this.messageList.size(); ++i) {
                final Message current = this.messageList.get(i);
                if (i == 0 || !UIHelper.sameDay(this.messageList.get(i - 1).getTimeSent(), current.getTimeSent())) {
                    this.messageList.add(i, Message.createDateSeparator(current));
                    i++;
                }
            }
        }
    }

    public void stopScrolling() {
        long now = SystemClock.uptimeMillis();
        MotionEvent cancel = MotionEvent.obtain(now, now, MotionEvent.ACTION_CANCEL, 0, 0, 0);
        messagesView.dispatchTouchEvent(cancel);
    }

    private boolean showLoadMoreMessages(final Conversation c) {
        final boolean mam = hasMamSupport(c);
        final MessageArchiveService service = activity.xmppConnectionService.getMessageArchiveService();
        return mam && (c.getLastClearHistory().getTimestamp() != 0 || (c.countMessages() == 0 && c.messagesLoaded.get() && c.hasMessagesLeftOnServer() && !service.queryInProgress(c)));
    }

    private boolean hasMamSupport(final Conversation c) {
        if (c.getMode() == Conversation.MODE_SINGLE) {
            final XmppConnection connection = c.getAccount().getXmppConnection();
            return connection != null && connection.getFeatures().mam();
        } else {
            return c.getMucOptions().mamSupport();
        }
    }

    protected void showSnackbar(final int message, final int action, final OnClickListener clickListener) {
        showSnackbar(message, action, clickListener, null);
    }

    protected void showSnackbar(final int message, final int action, final OnClickListener clickListener, final View.OnLongClickListener longClickListener) {
        snackbar.setVisibility(View.VISIBLE);
        snackbar.setOnClickListener(null);
        snackbarMessage.setText(message);
        snackbarMessage.setOnClickListener(null);
        snackbarAction.setVisibility(clickListener == null ? View.GONE : View.VISIBLE);
        if (action != 0) {
            snackbarAction.setText(action);
        }
        snackbarAction.setOnClickListener(clickListener);
        snackbarAction.setOnLongClickListener(longClickListener);
    }

    protected void hideSnackbar() {
        snackbar.setVisibility(View.GONE);
    }

    protected void showMessageHint(final String message) {
        messagehint.setVisibility(View.VISIBLE);
        messagehint_message.setText(message);
    }

    protected void hideMessageHint() {
        messagehint.setVisibility(View.GONE);
    }

    protected void sendPlainTextMessage(Message message) {
        ConversationActivity activity = (ConversationActivity) getActivity();
        activity.xmppConnectionService.sendMessage(message);
        messageSent();
    }

    protected void sendPgpMessage(final Message message) {
        final ConversationActivity activity = (ConversationActivity) getActivity();
        final XmppConnectionService xmppService = activity.xmppConnectionService;
        final Contact contact = message.getConversation().getContact();
        if (!activity.hasPgp()) {
            activity.showInstallPgpDialog();
            return;
        }
        if (conversation.getAccount().getPgpSignature() == null) {
            activity.announcePgp(conversation.getAccount(), conversation, null, activity.onOpenPGPKeyPublished);
            return;
        }
        if (!mSendingPgpMessage.compareAndSet(false, true)) {
            Log.d(Config.LOGTAG, "sending pgp message already in progress");
        }
        if (conversation.getMode() == Conversation.MODE_SINGLE) {
            if (contact.getPgpKeyId() != 0) {
                xmppService.getPgpEngine().hasKey(contact,
                        new UiCallback<Contact>() {

                            @Override
                            public void userInputRequried(PendingIntent pi,
                                                          Contact contact) {
                                activity.runIntent(
                                        pi,
                                        ConversationActivity.REQUEST_ENCRYPT_MESSAGE);
                            }

                            @Override
                            public void success(Contact contact) {
                                activity.encryptTextMessage(message);
                            }

                            @Override
                            public void error(int error, Contact contact) {
                                activity.runOnUiThread(new Runnable() {
                                    @Override
                                    public void run() {
                                        Toast.makeText(activity,
                                                R.string.unable_to_connect_to_keychain,
                                                Toast.LENGTH_SHORT
                                        ).show();
                                    }
                                });
                                mSendingPgpMessage.set(false);
                            }
                        });

            } else {
                showNoPGPKeyDialog(false,
                        new DialogInterface.OnClickListener() {

                            @Override
                            public void onClick(DialogInterface dialog,
                                                int which) {
                                conversation
                                        .setNextEncryption(Message.ENCRYPTION_NONE);
                                xmppService.updateConversation(conversation);
                                message.setEncryption(Message.ENCRYPTION_NONE);
                                xmppService.sendMessage(message);
                                messageSent();
                            }
                        });
            }
        } else {
            if (conversation.getMucOptions().pgpKeysInUse()) {
                if (!conversation.getMucOptions().everybodyHasKeys()) {
                    Toast warning = Toast
                            .makeText(getActivity(),
                                    R.string.missing_public_keys,
                                    Toast.LENGTH_LONG);
                    warning.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
                    warning.show();
                }
                activity.encryptTextMessage(message);
            } else {
                showNoPGPKeyDialog(true,
                        new DialogInterface.OnClickListener() {

                            @Override
                            public void onClick(DialogInterface dialog,
                                                int which) {
                                conversation
                                        .setNextEncryption(Message.ENCRYPTION_NONE);
                                message.setEncryption(Message.ENCRYPTION_NONE);
                                xmppService.updateConversation(conversation);
                                xmppService.sendMessage(message);
                                messageSent();
                            }
                        });
            }
        }
    }

    public void showNoPGPKeyDialog(boolean plural,
                                   DialogInterface.OnClickListener listener) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setIconAttribute(android.R.attr.alertDialogIcon);
        if (plural) {
            builder.setTitle(getString(R.string.no_pgp_keys));
            builder.setMessage(getText(R.string.contacts_have_no_pgp_keys));
        } else {
            builder.setTitle(getString(R.string.no_pgp_key));
            builder.setMessage(getText(R.string.contact_has_no_pgp_key));
        }
        builder.setNegativeButton(getString(R.string.cancel), null);
        builder.setPositiveButton(getString(R.string.send_unencrypted),
                listener);
        builder.create().show();
    }

    protected void sendAxolotlMessage(final Message message) {
        final ConversationActivity activity = (ConversationActivity) getActivity();
        final XmppConnectionService xmppService = activity.xmppConnectionService;
        xmppService.sendMessage(message);
        messageSent();
    }

    protected void sendOtrMessage(final Message message) {
        final ConversationActivity activity = (ConversationActivity) getActivity();
        final XmppConnectionService xmppService = activity.xmppConnectionService;
        activity.selectPresence(message.getConversation(),
                new OnPresenceSelected() {

                    @Override
                    public void onPresenceSelected() {
                        message.setCounterpart(conversation.getNextCounterpart());
                        xmppService.sendMessage(message);
                        messageSent();
                    }
                });
    }

    public void appendText(String text) {
        if (text == null) {
            return;
        }
        String previous = this.mEditMessage.getText().toString();
        if (previous.length() != 0 && !previous.endsWith(" ")) {
            text = " " + text;
        }
        this.mEditMessage.append(text);
    }

    @Override
    public boolean onEnterPressed() {
        if (activity.enterIsSend()) {
            sendMessage();
            return true;
        } else {
            return false;
        }
    }

    @Override
    public void onTypingStarted() {
        final boolean broadcastLastActivity = activity.xmppConnectionService.broadcastLastActivity();
        Account.State status = conversation.getAccount().getStatus();
        if (status == Account.State.ONLINE && conversation.setOutgoingChatState(ChatState.COMPOSING)) {
            activity.xmppConnectionService.sendChatState(conversation);
        }
        if (broadcastLastActivity) {
            activity.xmppConnectionService.sendPresence(conversation.getAccount(), false); //send new presence but don't include idle because we are not
        }
        activity.hideConversationsOverview();
        updateSendButton();
    }

    @Override
    public void onTypingStopped() {
        Account.State status = conversation.getAccount().getStatus();
        if (status == Account.State.ONLINE && conversation.setOutgoingChatState(ChatState.PAUSED)) {
            activity.xmppConnectionService.sendChatState(conversation);
        }
    }

    @Override
    public void onTextDeleted() {
        Account.State status = conversation.getAccount().getStatus();
        if (status == Account.State.ONLINE && conversation.setOutgoingChatState(Config.DEFAULT_CHATSTATE)) {
            activity.xmppConnectionService.sendChatState(conversation);
        }
        updateSendButton();
    }

    @Override
    public void onTextChanged() {
        if (conversation != null && conversation.getCorrectingMessage() != null) {
            updateSendButton();
        }
    }

    @Override
    public boolean onTabPressed(boolean repeated) {
        if (conversation == null || conversation.getMode() == Conversation.MODE_SINGLE) {
            return false;
        }
        if (repeated) {
            completionIndex++;
        } else {
            lastCompletionLength = 0;
            completionIndex = 0;
            final String content = mEditMessage.getText().toString();
            lastCompletionCursor = mEditMessage.getSelectionEnd();
            int start = lastCompletionCursor > 0 ? content.lastIndexOf(" ", lastCompletionCursor - 1) + 1 : 0;
            firstWord = start == 0;
            incomplete = content.substring(start, lastCompletionCursor);
        }
        List<String> completions = new ArrayList<>();
        for (MucOptions.User user : conversation.getMucOptions().getUsers()) {
            String name = user.getName();
            if (name != null && name.startsWith(incomplete)) {
                completions.add(name + (firstWord ? ": " : " "));
            }
        }
        Collections.sort(completions);
        if (completions.size() > completionIndex) {
            String completion = completions.get(completionIndex).substring(incomplete.length());
            mEditMessage.getEditableText().delete(lastCompletionCursor, lastCompletionCursor + lastCompletionLength);
            mEditMessage.getEditableText().insert(lastCompletionCursor, completion);
            lastCompletionLength = completion.length();
        } else {
            completionIndex = -1;
            mEditMessage.getEditableText().delete(lastCompletionCursor, lastCompletionCursor + lastCompletionLength);
            lastCompletionLength = 0;
        }
        return true;
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode,
                                 final Intent data) {
        if (resultCode == Activity.RESULT_OK) {
            if (requestCode == ConversationActivity.REQUEST_DECRYPT_PGP) {
                activity.getSelectedConversation().getAccount().getPgpDecryptionService().continueDecryption(data);
            } else if (requestCode == ConversationActivity.REQUEST_TRUST_KEYS_TEXT) {
                final String body = mEditMessage.getText().toString();
                Message message = new Message(conversation, body, conversation.getNextEncryption());
                sendAxolotlMessage(message);
            } else if (requestCode == ConversationActivity.REQUEST_TRUST_KEYS_MENU) {
                int choice = data.getIntExtra("choice", ConversationActivity.ATTACHMENT_CHOICE_INVALID);
                activity.selectPresenceToAttachFile(choice, conversation.getNextEncryption());
            }
        } else if (resultCode == Activity.RESULT_CANCELED) {
            if (requestCode == ConversationActivity.REQUEST_DECRYPT_PGP) {
                // discard the message to prevent decryption being blocked
                conversation.getAccount().getPgpDecryptionService().giveUpCurrentDecryption();
            }
        }
    }

    enum SendButtonAction {
        TEXT, TAKE_FROM_CAMERA, SEND_LOCATION, RECORD_VOICE, CANCEL, CHOOSE_PICTURE;

        public static SendButtonAction valueOfOrDefault(String setting, SendButtonAction text) {
            try {
                return valueOf(setting);
            } catch (IllegalArgumentException e) {
                return TEXT;
            }
        }
    }
}