/*
 * wbmanager.cpp - Whiteboard manager
 * Copyright (C) 2007  Joonas Govenius
 *
 * Influenced by:
 * pepmanager.cpp - Classes for PEP
 * Copyright (C) 2006  Remko Troncon
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 */

#include <QDebug>
#include <QMessageBox>
#include <QEventLoop>

#include "wbmanager.h"
#include "psipopup.h"

#define EMPTYWB "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\"> <svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.2\" viewBox=\"0 0 600 400\" baseProfile=\"tiny\" />"

using namespace XMPP;


class WbRequest
{
public:
    WbRequest() : loop_(new QEventLoop), id_(lastRequetsId++)
    {}

    ~WbRequest()
    {
        if(loop_->isRunning())
            loop_->exit();
        delete loop_;
    }

    void startLoop()
    {
        loop_->exec();
    }

    void stopLoop()
    {
        loop_->exit();
    }

    int id() const
    {
        return id_;
    }

private:
    QEventLoop *loop_;
    int id_;

    static int lastRequetsId;
};

int WbRequest::lastRequetsId = 0;

// -----------------------------------------------------------------------------
WbManager::WbManager(XMPP::Client* client, PsiAccount* pa, SxeManager* sxemanager) {
    pa_ = pa;
    sxemanager_ = sxemanager;

    Q_UNUSED(client)

    connect(sxemanager_, SIGNAL(sessionNegotiated(SxeSession*)), SLOT(createWbDlg(SxeSession*)));
    //sxemanager_->addInvitationCallback(WbManager::checkInvitation);
    connect(sxemanager, SIGNAL(invitationCallback(Jid,QList<QString>,bool*)), this, SLOT(checkInvitation(Jid,QList<QString>,bool*)));
}

WbManager::~WbManager()
{
    qDeleteAll(dialogs_);
    qDeleteAll(requests_);
}

void WbManager::openWhiteboard(const Jid &target, const Jid &ownJid, bool groupChat, bool promptInitialDoc) {

    // check that the target supports whiteboarding via SXE
    QList<QString> features;
    features += WBNS;
    if(!sxemanager_->checkSupport(target, features)) {
        QMessageBox::information(NULL, tr("Unsupported"), tr("The contact does not support whiteboarding."));
        return;
    }


    // See if we have a session for the JID
    WbDlg* w = findWbDlg(target);
    if(!w) {
        // else negotiate a new session and return null

        QDomDocument doc;

        if(promptInitialDoc) {
            bool openExisting = (QMessageBox::Yes == QMessageBox::question(NULL,
                                                        tr("Open Existing SVG?"),
                                                        tr("Would you like to open an existing SVG document in the whitebaord?"),
                                                        QMessageBox::Yes | QMessageBox::No,
                                                        QMessageBox::No));

            if(openExisting) {
                // prompt for an existing file
                QString fileName = QFileDialog::getOpenFileName(NULL, tr("Initial SVG Document for the Whiteboard"),
                                                                 QDir::homePath(),
                                                                 tr("Scalable Vector Graphics (*.svg)"));

                QFile file(fileName);
                if(file.open(QIODevice::ReadOnly)) {
                    doc.setContent(file.readAll(), true);
                    file.close();
                }
            }
        }

        if(doc.documentElement().nodeName() != "svg") {

            // initialize with an empty whiteboarding document
            doc = QDomDocument();
            doc.setContent(QString(EMPTYWB), true);

        }


        // negotiate the session
        sxemanager_->startNewSession(target, ownJid, groupChat, doc, features);
    }
    else
        bringToFront(w);
}

void WbManager::removeDialog(WbDlg* dialog)
{
    dialogs_.removeAt(dialogs_.indexOf(dialog));
    delete dialog;
}

WbDlg* WbManager::findWbDlg(const Jid &jid) {
    // find if a dialog for the jid already exists
    foreach(WbDlg* w, dialogs_) {
        // does the jid match?
        if(w->session()->target().compare(jid)) {
            return w;
        }
    }
    return 0;
}

void WbManager::createWbDlg(SxeSession* session) {
    // check if the session is a whiteboarding session
    bool whiteboarding = false;
    foreach(QString feature, session->features()) {
        if(feature == WBNS)
            whiteboarding = true;
    }

    if(whiteboarding) {
        // create the WbDlg
        WbDlg* w = new WbDlg(session, pa_);

        // connect the signals
        connect(w, SIGNAL(sessionEnded(WbDlg*)), SLOT(removeDialog(WbDlg*)));
        connect(session, SIGNAL(peerLeftSession(Jid)), w, SLOT(peerLeftSession(Jid)));

        dialogs_.append(w);

        bringToFront(w);
    }
}

void WbManager::checkInvitation(const Jid &peer, const QList<QString> &features, bool* result) {
    if(*result)
        return;

    if(!features.contains(WBNS)) {
        *result = false;
        return;
    }

    WbRequest* wr = new WbRequest();
    requests_.append(wr);
    emit wbRequest(peer, wr->id());
    wr->startLoop();
    requests_.removeAll(wr);
    delete wr;
    *result = (QMessageBox::Yes == QMessageBox::question(NULL,
                                    tr("Whiteboarding Invitation?"),
                                    tr("%1 has invited you to a whiteboarding session. Would you like to join?").arg(peer.full()),
                                    QMessageBox::Yes | QMessageBox::No,
                                    QMessageBox::No));
}

void WbManager::requestActivated(int id) {
    foreach(WbRequest* wr, requests_) {
        if(wr->id() == id) {
            wr->stopLoop();
            return;
        }
    }
}
