package de.pixart.messenger.parser;

import android.util.Log;

import java.util.ArrayList;
import java.util.List;

import de.pixart.messenger.Config;
import de.pixart.messenger.crypto.PgpEngine;
import de.pixart.messenger.crypto.axolotl.AxolotlService;
import de.pixart.messenger.entities.Account;
import de.pixart.messenger.entities.Contact;
import de.pixart.messenger.entities.Conversation;
import de.pixart.messenger.entities.Message;
import de.pixart.messenger.entities.MucOptions;
import de.pixart.messenger.entities.Presence;
import de.pixart.messenger.generator.IqGenerator;
import de.pixart.messenger.generator.PresenceGenerator;
import de.pixart.messenger.services.XmppConnectionService;
import de.pixart.messenger.utils.Namespace;
import de.pixart.messenger.utils.XmppUri;
import de.pixart.messenger.xml.Element;
import de.pixart.messenger.xmpp.InvalidJid;
import de.pixart.messenger.xmpp.OnPresencePacketReceived;
import de.pixart.messenger.xmpp.pep.Avatar;
import de.pixart.messenger.xmpp.stanzas.PresencePacket;
import rocks.xmpp.addr.Jid;

public class PresenceParser extends AbstractParser implements
        OnPresencePacketReceived {

    public PresenceParser(XmppConnectionService service) {
        super(service);
    }

    public void parseConferencePresence(PresencePacket packet, Account account) {
        final Conversation conversation = packet.getFrom() == null ? null : mXmppConnectionService.find(account, packet.getFrom().asBareJid());
        if (conversation != null) {
            final MucOptions mucOptions = conversation.getMucOptions();
            boolean before = mucOptions.online();
            int count = mucOptions.getUserCount();
            final List<MucOptions.User> tileUserBefore = mucOptions.getUsers(5);
            processConferencePresence(packet, conversation);
            final List<MucOptions.User> tileUserAfter = mucOptions.getUsers(5);
            if (!tileUserAfter.equals(tileUserBefore)) {
                mXmppConnectionService.getAvatarService().clear(mucOptions);
            }
            if (before != mucOptions.online() || (mucOptions.online() && count != mucOptions.getUserCount())) {
                mXmppConnectionService.updateConversationUi();
            } else if (mucOptions.online()) {
                mXmppConnectionService.updateMucRosterUi();
            }
        }
    }

    private void processConferencePresence(PresencePacket packet, Conversation conversation) {
        MucOptions mucOptions = conversation.getMucOptions();
        final Jid jid = conversation.getAccount().getJid();
        final Jid from = packet.getFrom();
        if (!from.isBareJid()) {
            final String type = packet.getAttribute("type");
            final Element x = packet.findChild("x", "http://jabber.org/protocol/muc#user");
            Avatar avatar = Avatar.parsePresence(packet.findChild("x", "vcard-temp:x:update"));
            final List<String> codes = getStatusCodes(x);
            if (type == null) {
                if (x != null) {
                    Element item = x.findChild("item");
                    if (item != null && !from.isBareJid()) {
                        mucOptions.setError(MucOptions.Error.NONE);
                        MucOptions.User user = parseItem(conversation, item, from);
                        if (codes.contains(MucOptions.STATUS_CODE_SELF_PRESENCE) || (codes.contains(MucOptions.STATUS_CODE_ROOM_CREATED) && jid.equals(InvalidJid.getNullForInvalid(item.getAttributeAsJid("jid"))))) {
                            if (mucOptions.setOnline()) {
                                mXmppConnectionService.getAvatarService().clear(mucOptions);
                            }
                            if (mucOptions.setSelf(user)) {
                                Log.d(Config.LOGTAG, "role or affiliation changed");
                                mXmppConnectionService.databaseBackend.updateConversation(conversation);
                            }
                            mXmppConnectionService.persistSelfNick(user);
                            invokeRenameListener(mucOptions, true);
                        }
                        boolean isNew = mucOptions.updateUser(user);
                        final AxolotlService axolotlService = conversation.getAccount().getAxolotlService();
                        Contact contact = user.getContact();
                        if (isNew
                                && user.getRealJid() != null
                                && mucOptions.isPrivateAndNonAnonymous()
                                && (contact == null || !contact.mutualPresenceSubscription())
                                && axolotlService.hasEmptyDeviceList(user.getRealJid())) {
                            axolotlService.fetchDeviceIds(user.getRealJid());
                        }
                        if (codes.contains(MucOptions.STATUS_CODE_ROOM_CREATED) && mucOptions.autoPushConfiguration()) {
                            Log.d(Config.LOGTAG, mucOptions.getAccount().getJid().asBareJid()
                                    + ": room '"
                                    + mucOptions.getConversation().getJid().asBareJid()
                                    + "' created. pushing default configuration");
                            mXmppConnectionService.pushConferenceConfiguration(mucOptions.getConversation(),
                                    IqGenerator.defaultChannelConfiguration(),
                                    null);
                        }
                        if (mXmppConnectionService.getPgpEngine() != null) {
                            Element signed = packet.findChild("x", "jabber:x:signed");
                            if (signed != null) {
                                Element status = packet.findChild("status");
                                String msg = status == null ? "" : status.getContent();
                                long keyId = mXmppConnectionService.getPgpEngine().fetchKeyId(mucOptions.getAccount(), msg, signed.getContent());
                                if (keyId != 0) {
                                    user.setPgpKeyId(keyId);
                                }
                            }
                        }
                        if (avatar != null) {
                            avatar.owner = from;
                            if (mXmppConnectionService.getFileBackend().isAvatarCached(avatar)) {
                                if (user.setAvatar(avatar)) {
                                    mXmppConnectionService.getAvatarService().clear(user);
                                }
                                if (user.getRealJid() != null) {
                                    Contact c = conversation.getAccount().getRoster().getContact(user.getRealJid());
                                    if (c.setAvatar(avatar)) {
                                        mXmppConnectionService.syncRoster(conversation.getAccount());
                                        mXmppConnectionService.getAvatarService().clear(c);
                                        mXmppConnectionService.updateRosterUi();
                                    }
                                }
                            } else if (mXmppConnectionService.isDataSaverDisabled()) {
                                mXmppConnectionService.fetchAvatar(mucOptions.getAccount(), avatar);
                            }
                        }
                    }
                }
            } else if (type.equals("unavailable")) {
                final boolean fullJidMatches = from.equals(mucOptions.getSelf().getFullJid());
                if (x.hasChild("destroy") && fullJidMatches) {
                    Element destroy = x.findChild("destroy");
                    final Jid alternate = destroy == null ? null : InvalidJid.getNullForInvalid(destroy.getAttributeAsJid("jid"));
                    mucOptions.setError(MucOptions.Error.DESTROYED);
                    if (alternate != null) {
                        Log.d(Config.LOGTAG, conversation.getAccount().getJid().asBareJid() + ": muc destroyed. alternate location " + alternate);
                    }
                } else if (codes.contains(MucOptions.STATUS_CODE_SHUTDOWN) && fullJidMatches) {
                    mucOptions.setError(MucOptions.Error.SHUTDOWN);
                } else if (codes.contains(MucOptions.STATUS_CODE_SELF_PRESENCE)) {
                    if (codes.contains(MucOptions.STATUS_CODE_KICKED)) {
                        mucOptions.setError(MucOptions.Error.KICKED);
                    } else if (codes.contains(MucOptions.STATUS_CODE_BANNED)) {
                        mucOptions.setError(MucOptions.Error.BANNED);
                    } else if (codes.contains(MucOptions.STATUS_CODE_LOST_MEMBERSHIP)) {
                        mucOptions.setError(MucOptions.Error.MEMBERS_ONLY);
                    } else if (codes.contains(MucOptions.STATUS_CODE_AFFILIATION_CHANGE)) {
                        mucOptions.setError(MucOptions.Error.MEMBERS_ONLY);
                    } else if (codes.contains(MucOptions.STATUS_CODE_SHUTDOWN)) {
                        mucOptions.setError(MucOptions.Error.SHUTDOWN);
                    } else if (!codes.contains(MucOptions.STATUS_CODE_CHANGED_NICK)) {
                        mucOptions.setError(MucOptions.Error.UNKNOWN);
                        Log.d(Config.LOGTAG, "unknown error in conference: " + packet);
                    }
                } else if (!from.isBareJid()) {
                    Element item = x.findChild("item");
                    if (item != null) {
                        mucOptions.updateUser(parseItem(conversation, item, from));
                    }
                    MucOptions.User user = mucOptions.deleteUser(from);
                    if (user != null) {
                        mXmppConnectionService.getAvatarService().clear(user);
                    }
                }
            } else if (type.equals("error")) {
                final Element error = packet.findChild("error");
                if (error == null) {
                    return;
                }
                if (error.hasChild("conflict")) {
                    if (mucOptions.online()) {
                        invokeRenameListener(mucOptions, false);
                    } else {
                        mucOptions.setError(MucOptions.Error.NICK_IN_USE);
                    }
                } else if (error.hasChild("not-authorized")) {
                    mucOptions.setError(MucOptions.Error.PASSWORD_REQUIRED);
                } else if (error.hasChild("forbidden")) {
                    mucOptions.setError(MucOptions.Error.BANNED);
                } else if (error.hasChild("registration-required")) {
                    mucOptions.setError(MucOptions.Error.MEMBERS_ONLY);
                } else if (error.hasChild("resource-constraint")) {
                    mucOptions.setError(MucOptions.Error.RESOURCE_CONSTRAINT);
                } else if (error.hasChild("remote-server-timeout")) {
                    mucOptions.setError(MucOptions.Error.REMOTE_SERVER_TIMEOUT);
                } else if (error.hasChild("gone")) {
                    final String gone = error.findChildContent("gone");
                    final Jid alternate;
                    if (gone != null) {
                        final XmppUri xmppUri = new XmppUri(gone);
                        if (xmppUri.isJidValid()) {
                            alternate = xmppUri.getJid();
                        } else {
                            alternate = null;
                        }
                    } else {
                        alternate = null;
                    }
                    mucOptions.setError(MucOptions.Error.DESTROYED);
                    if (alternate != null) {
                        Log.d(Config.LOGTAG, conversation.getAccount().getJid().asBareJid() + ": muc destroyed. alternate location " + alternate);
                    }
                } else {
                    final String text = error.findChildContent("text");
                    if (text != null && text.contains("attribute 'to'")) {
                        if (mucOptions.online()) {
                            invokeRenameListener(mucOptions, false);
                        } else {
                            mucOptions.setError(MucOptions.Error.INVALID_NICK);
                        }
                    } else {
                        mucOptions.setError(MucOptions.Error.UNKNOWN);
                        Log.d(Config.LOGTAG, "unknown error in conference: " + packet);
                    }
                }
            }
        }
    }

    private static void invokeRenameListener(final MucOptions options, boolean success) {
        if (options.onRenameListener != null) {
            if (success) {
                options.onRenameListener.onSuccess();
            } else {
                options.onRenameListener.onFailure();
            }
            options.onRenameListener = null;
        }
    }

    private static List<String> getStatusCodes(Element x) {
        List<String> codes = new ArrayList<>();
        if (x != null) {
            for (Element child : x.getChildren()) {
                if (child.getName().equals("status")) {
                    String code = child.getAttribute("code");
                    if (code != null) {
                        codes.add(code);
                    }
                }
            }
        }
        return codes;
    }

    private void parseContactPresence(final PresencePacket packet, final Account account) {
        final PresenceGenerator mPresenceGenerator = mXmppConnectionService.getPresenceGenerator();
        final Jid from = packet.getFrom();
        if (from == null || from.equals(account.getJid())) {
            return;
        }
        final String type = packet.getAttribute("type");
        final Contact contact = account.getRoster().getContact(from);
        if (type == null) {
            final String resource = from.isBareJid() ? "" : from.getResource();
            Avatar avatar = Avatar.parsePresence(packet.findChild("x", "vcard-temp:x:update"));
            if (avatar != null && (!contact.isSelf() || account.getAvatar() == null)) {
                avatar.owner = from.asBareJid();
                if (mXmppConnectionService.getFileBackend().isAvatarCached(avatar)) {
                    if (avatar.owner.equals(account.getJid().asBareJid())) {
                        account.setAvatar(avatar.getFilename());
                        mXmppConnectionService.databaseBackend.updateAccount(account);
                        mXmppConnectionService.getAvatarService().clear(account);
                        mXmppConnectionService.updateConversationUi();
                        mXmppConnectionService.updateAccountUi();
                    } else if (contact.setAvatar(avatar)) {
                        mXmppConnectionService.syncRoster(account);
                        mXmppConnectionService.getAvatarService().clear(contact);
                        mXmppConnectionService.updateConversationUi();
                        mXmppConnectionService.updateRosterUi();
                    }
                } else if (mXmppConnectionService.isDataSaverDisabled()) {
                    mXmppConnectionService.fetchAvatar(account, avatar);
                }
            }

            if (mXmppConnectionService.isMuc(account, from)) {
                return;
            }
            int sizeBefore = contact.getPresences().size();

            final String show = packet.findChildContent("show");
            final Element caps = packet.findChild("c", "http://jabber.org/protocol/caps");
            final String message = packet.findChildContent("status");
            final Presence presence = Presence.parse(show, caps, message);
            contact.updatePresence(resource, presence);
            if (presence.hasCaps()) {
                mXmppConnectionService.fetchCaps(account, from, presence);
            }

            final Element idle = packet.findChild("idle", Namespace.IDLE);
            if (idle != null) {
                try {
                    final String since = idle.getAttribute("since");
                    contact.setLastseen(AbstractParser.parseTimestamp(since));
                    contact.flagInactive();
                } catch (Throwable throwable) {
                    if (contact.setLastseen(AbstractParser.parseTimestamp(packet))) {
                        contact.flagActive();
                    }
                }
            } else {
                if (contact.setLastseen(AbstractParser.parseTimestamp(packet))) {
                    contact.flagActive();
                }
            }

            PgpEngine pgp = mXmppConnectionService.getPgpEngine();
            Element x = packet.findChild("x", "jabber:x:signed");
            if (pgp != null && x != null) {
                Element status = packet.findChild("status");
                String msg = status != null ? status.getContent() : "";
                if (contact.setPgpKeyId(pgp.fetchKeyId(account, msg, x.getContent()))) {
                    mXmppConnectionService.syncRoster(account);
                }
            }
            boolean online = sizeBefore < contact.getPresences().size();
            mXmppConnectionService.onContactStatusChanged.onContactStatusChanged(contact, online);
        } else if (type.equals("unavailable")) {
            if (contact.setLastseen(AbstractParser.parseTimestamp(packet, 0L, true))) {
                contact.flagInactive();
            }
            if (from.isBareJid()) {
                contact.clearPresences();
            } else {
                contact.removePresence(from.getResource());
            }
            if (contact.getShownStatus() == Presence.Status.OFFLINE) {
                contact.flagInactive();
            }
            mXmppConnectionService.onContactStatusChanged.onContactStatusChanged(contact, false);
        } else if (type.equals("subscribe")) {
            if (contact.setPresenceName(packet.findChildContent("nick", Namespace.NICK))) {
                mXmppConnectionService.getAvatarService().clear(contact);
            }
            if (contact.getOption(Contact.Options.PREEMPTIVE_GRANT)) {
                mXmppConnectionService.sendPresencePacket(account,
                        mPresenceGenerator.sendPresenceUpdatesTo(contact));
            } else {
                contact.setOption(Contact.Options.PENDING_SUBSCRIPTION_REQUEST);
                final Conversation conversation = mXmppConnectionService.findOrCreateConversation(
                        account, contact.getJid().asBareJid(), false, false);
                final String statusMessage = packet.findChildContent("status");
                if (statusMessage != null
                        && !statusMessage.isEmpty()
                        && conversation.countMessages() == 0) {
                    conversation.add(new Message(
                            conversation,
                            statusMessage,
                            Message.ENCRYPTION_NONE,
                            Message.STATUS_RECEIVED
                    ));
                }
            }
        }
        mXmppConnectionService.updateRosterUi();
    }

    @Override
    public void onPresencePacketReceived(Account account, PresencePacket packet) {
        if (packet.hasChild("x", "http://jabber.org/protocol/muc#user")) {
            this.parseConferencePresence(packet, account);
        } else if (packet.hasChild("x", "http://jabber.org/protocol/muc")) {
            this.parseConferencePresence(packet, account);
        } else if ("error".equals(packet.getAttribute("type")) && mXmppConnectionService.isMuc(account, packet.getFrom())) {
            this.parseConferencePresence(packet, account);
        } else {
            this.parseContactPresence(packet, account);
        }
    }

}