#include "account.h"
#include <qxmpp/QXmppRosterManager.h>
#include <QDateTime>

using namespace Core;

Account::Account(const QString& p_login, const QString& p_server, const QString& p_password, const QString& p_name, QObject* parent):
    QObject(parent),
    name(p_name),
    client(),
    config(),
    presence(),
    state(Shared::disconnected),
    groups()
{
    config.setUser(p_login);
    config.setDomain(p_server);
    config.setPassword(p_password);
    
    QObject::connect(&client, SIGNAL(connected()), this, SLOT(onClientConnected()));
    QObject::connect(&client, SIGNAL(disconnected()), this, SLOT(onClientDisconnected()));
    QObject::connect(&client, SIGNAL(presenceReceived(const QXmppPresence&)), this, SLOT(onPresenceReceived(const QXmppPresence&)));
    
    QXmppRosterManager& rm = client.rosterManager();
    
    QObject::connect(&rm, SIGNAL(rosterReceived()), this, SLOT(onRosterReceived()));
    QObject::connect(&rm, SIGNAL(itemAdded(const QString&)), this, SLOT(onRosterItemAdded(const QString&)));
    QObject::connect(&rm, SIGNAL(itemRemoved(const QString&)), this, SLOT(onRosterItemRemoved(const QString&)));
    QObject::connect(&rm, SIGNAL(itemChanged(const QString&)), this, SLOT(onRosterItemChanged(const QString&)));
    //QObject::connect(&rm, SIGNAL(presenceChanged(const QString&, const QString&)), this, SLOT(onRosterPresenceChanged(const QString&, const QString&)));
}

Account::~Account()
{
}

Shared::ConnectionState Core::Account::getState() const
{
    return state;
}

void Core::Account::connect()
{
    if (state == Shared::disconnected) {
        client.connectToServer(config, presence);
        state = Shared::connecting;
        emit connectionStateChanged(state);
    } else {
        qDebug("An attempt to connect an account which is already connected, skipping");
    }
}

void Core::Account::disconnect()
{
    if (state != Shared::disconnected) {
        client.disconnectFromServer();
        state = Shared::disconnected;
        emit connectionStateChanged(state);
    }
}

void Core::Account::onClientConnected()
{
    if (state == Shared::connecting) {
        state = Shared::connected;
        emit connectionStateChanged(state);
    } else {
        qDebug("Something weird had happened - xmpp client reported about successful connection but account wasn't in connecting state");
    }
}

void Core::Account::onClientDisconnected()
{
    if (state != Shared::disconnected) {
        state = Shared::disconnected;
        emit connectionStateChanged(state);
    } else {
        //qDebug("Something weird had happened - xmpp client reported about being disconnection but account was already in disconnected state");
    }
}

QString Core::Account::getName() const
{
    return name;
}

QString Core::Account::getLogin() const
{
    return config.user();
}

QString Core::Account::getPassword() const
{
    return config.password();
}

QString Core::Account::getServer() const
{
    return config.domain();
}

void Core::Account::onRosterReceived()
{
    QXmppRosterManager& rm = client.rosterManager();
    QStringList bj = rm.getRosterBareJids();
    for (int i = 0; i < bj.size(); ++i) {
        const QString& jid = bj[i];
        addedAccount(jid);
    }
}

void Core::Account::onRosterItemAdded(const QString& bareJid)
{
    addedAccount(bareJid);
}

void Core::Account::onRosterItemChanged(const QString& bareJid)
{
    QXmppRosterManager& rm = client.rosterManager();
    QXmppRosterIq::Item re = rm.getRosterEntry(bareJid);
    QSet<QString> newGroups = re.groups();
    QSet<QString> oldGroups;
    
    
    QStringList res = rm.getResources(bareJid);
    unsigned int state = re.subscriptionType();
    if (state == QXmppRosterIq::Item::NotSet) {
        state = Shared::unknown;
    }
    QMap<QString, QVariant> cData({
        {"name", re.name()},
        {"state", state}
    });
    
    emit changeContact(bareJid, cData);
    
    for (std::map<QString, std::set<QString>>::iterator itr = groups.begin(), end = groups.end(); itr != end; ++itr) {
        std::set<QString>& contacts = itr->second;
        std::set<QString>::const_iterator cItr = contacts.find(bareJid);
        if (cItr != contacts.end()) {
            oldGroups.insert(itr->first);
        }
    }
    
    QSet<QString> toRemove = oldGroups - newGroups;
    QSet<QString> toAdd = newGroups - oldGroups;
    
    QSet<QString> removeGroups;
    for (QSet<QString>::iterator itr = toRemove.begin(), end = toRemove.end(); itr != end; ++itr) {
        const QString& groupName = *itr;
        std::set<QString>& contacts = groups.find(groupName)->second;
        contacts.erase(bareJid);
        emit removeContact(bareJid, groupName);
        if (contacts.size() == 0) {
            removeGroups.insert(groupName);
        }
    }
    
    for (QSet<QString>::iterator itr = toAdd.begin(), end = toAdd.end(); itr != end; ++itr) {
        const QString& groupName = *itr;
        std::map<QString, std::set<QString>>::iterator cItr = groups.find(groupName);
        if (cItr == groups.end()) {
            cItr = groups.insert(std::make_pair(groupName, std::set<QString>())).first;
            emit addGroup(groupName);
        }
        cItr->second.insert(bareJid);
        emit addContact(bareJid, groupName, cData);
    }
    
    for (QSet<QString>::iterator itr = removeGroups.begin(), end = removeGroups.end(); itr != end; ++itr) {
        const QString& groupName = *itr;
        emit removeGroup(groupName);
        groups.erase(groupName);
    }
}

void Core::Account::onRosterItemRemoved(const QString& bareJid)
{
    emit removeContact(bareJid);
    
    QSet<QString> toRemove;
    for (std::map<QString, std::set<QString>>::iterator itr = groups.begin(), end = groups.end(); itr != end; ++itr) {
        std::set<QString> contacts = itr->second;
        std::set<QString>::const_iterator cItr = contacts.find(bareJid);
        if (cItr != contacts.end()) {
            contacts.erase(cItr);
            if (contacts.size() == 0) {
                toRemove.insert(itr->first);
            }
        }
    }
    
    for (QSet<QString>::iterator itr = toRemove.begin(), end = toRemove.end(); itr != end; ++itr) {
        const QString& groupName = *itr;
        emit removeGroup(groupName);
        groups.erase(groupName);
    }
}

void Core::Account::addedAccount(const QString& jid)
{
    QXmppRosterManager& rm = client.rosterManager();
    QXmppRosterIq::Item re = rm.getRosterEntry(jid);
    QSet<QString> gr = re.groups();
    unsigned int state = re.subscriptionType();
    if (state == QXmppRosterIq::Item::NotSet) {
        state = Shared::unknown;
    }
    QMap<QString, QVariant> cData({
        {"name", re.name()},
        {"state", state}
    });
    int grCount = 0;
    for (QSet<QString>::const_iterator itr = gr.begin(), end = gr.end(); itr != end; ++itr) {
        const QString& groupName = *itr;
        std::map<QString, std::set<QString>>::iterator gItr = groups.find(groupName);
        if (gItr == groups.end()) {
            gItr = groups.insert(std::make_pair(groupName, std::set<QString>())).first;
            emit addGroup(groupName);
        }
        gItr->second.insert(jid);
        emit addContact(jid, groupName, cData);
        grCount++;
    }
    
    if (grCount == 0) {
        emit addContact(jid, "", cData);
    }
}

void Core::Account::onPresenceReceived(const QXmppPresence& presence)
{
    QString id = presence.from();
    QStringList comps = id.split("/");
    QString jid = comps.front();
    QString resource = comps.back();
    
    QString myJid = getLogin() + "@" + getServer();
    
    if (jid == myJid) {
        if (resource == getResource()) {
            emit availabilityChanged(presence.availableStatusType());
        } else {
            qDebug() << "Received a presence for another resource of my " << name << " account, skipping";
        }
    }
    
    switch (presence.type()) {
        case QXmppPresence::Error:
            qDebug() << "An error reported by presence from " << id;
            break;
        case QXmppPresence::Available:{
            QDateTime lastInteraction = presence.lastUserInteraction();
            if (!lastInteraction.isValid()) {
                lastInteraction = QDateTime::currentDateTime();
            }
            emit addPresence(jid, resource, {
                {"lastActivity", lastInteraction},
                {"availability", presence.availableStatusType()},           //TODO check and handle invisible
                {"status", presence.statusText()}
            });
        }
            break;
        case QXmppPresence::Unavailable:
            emit removePresence(jid, resource);
            break;
        case QXmppPresence::Subscribe:
            qDebug("xmpp presence \"subscribe\" received, do not yet know what to do, skipping");
        case QXmppPresence::Subscribed:
            qDebug("xmpp presence \"subscribed\" received, do not yet know what to do, skipping");
        case QXmppPresence::Unsubscribe:
            qDebug("xmpp presence \"unsubscribe\" received, do not yet know what to do, skipping");
        case QXmppPresence::Unsubscribed:
            qDebug("xmpp presence \"unsubscribed\" received, do not yet know what to do, skipping");
        case QXmppPresence::Probe:
            qDebug("xmpp presence \"probe\" received, do not yet know what to do, skipping");
            break;
    }
}

void Core::Account::onRosterPresenceChanged(const QString& bareJid, const QString& resource)
{
    //not used for now;
    qDebug() << "presence changed for " << bareJid << " resource " << resource;
    const QXmppPresence& presence = client.rosterManager().getPresence(bareJid, resource);
}

void Core::Account::setLogin(const QString& p_login)
{
    config.setUser(p_login);
}

void Core::Account::setName(const QString& p_name)
{
    name = p_name;
}

void Core::Account::setPassword(const QString& p_password)
{
    config.setPassword(p_password);
}

void Core::Account::setServer(const QString& p_server)
{
    config.setDomain(p_server);
}

Shared::Availability Core::Account::getAvailability() const
{
    QXmppPresence::AvailableStatusType pres = presence.availableStatusType();
    return static_cast<Shared::Availability>(pres);         //TODO that's a shame! gotta do something about it
}

void Core::Account::setAvailability(Shared::Availability avail)
{
    QXmppPresence::AvailableStatusType pres = static_cast<QXmppPresence::AvailableStatusType>(avail);
    
    presence.setAvailableStatusType(pres);
    if (state != Shared::disconnected) {        //TODO not sure how to do here - changing state may cause connection or disconnection
        client.setClientPresence(presence);
    }
}

QString Core::Account::getResource() const
{
    return config.resource();
}

void Core::Account::setResource(const QString& p_resource)
{
    config.setResource(p_resource);
}