/*
 *   Copyright © 2009 Rob Scheepmaker <r.scheepmaker@student.utwente.nl>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library General Public License version 2 as
 *   published by the Free Software Foundation
 *
 *   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 Library General Public
 *   License along with this program; if not, write to the
 *   Free Software Foundation, Inc.,
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include "remotedataengine.h"

#include <QTimer>
#include <QUuid>
#include <kurl.h>
#include <plasma/accessmanager.h>
#include <plasma/private/remoteservice_p.h>
#include <plasma/serviceaccessjob.h>
#include <plasma/service.h>
#include <plasma/servicejob.h>

namespace Plasma
{

RemoteDataEngine::RemoteDataEngine(KUrl location, QObject* parent, const QVariantList& args)
    : Plasma::DataEngine(parent, args),
      m_service(0),
      m_callInProgress(true),
      m_location(location),
      m_uuid("")
{
    if (!location.isEmpty()) {
        setLocation(location);
    } else {
        kDebug() << "LOCATION IS EMPTY";
    }
}

RemoteDataEngine::~RemoteDataEngine()
{
}

void RemoteDataEngine::setLocation(KUrl location)
{
    m_location = location;
    setMinimumPollingInterval(1000);
    setPollingInterval(5000);
    m_uuid = QUuid::createUuid();
    Service *service = Service::access(location);
    connect(service, SIGNAL(serviceReady(Plasma::Service*)),
            this, SLOT(serviceReady(Plasma::Service*)));
}

Plasma::Service* RemoteDataEngine::serviceForSource(const QString& source)
{
    if (m_serviceForSource.contains(source)) {
        return m_serviceForSource[source];
    } else {
        RemoteService *service = new RemoteService(this);
        m_serviceForSource[source] = service;
        KConfigGroup op = m_service->operationDescription("ServiceForSource");
        op.writeEntry("SourceName", source);
        m_service->startOperationCall(op);
        return service;
    }
}

void RemoteDataEngine::init()
{
}

void RemoteDataEngine::serviceReady(Plasma::Service *service)
{
    m_service = service;
    KConfigGroup op = m_service->operationDescription("GetSourceNames");
    m_service->startOperationCall(op);
    connect(m_service, SIGNAL(finished(Plasma::ServiceJob*)),
            this, SLOT(remoteCallFinished(Plasma::ServiceJob*)));
    QTimer *timer = new QTimer(this);
    timer->setInterval(5000);
    connect(timer, SIGNAL(timeout()), this, SLOT(updateSources()));
    timer->start();
    m_callInProgress = false;
}

QStringList RemoteDataEngine::sources() const
{
    return m_sources;
}

void RemoteDataEngine::remoteCallFinished(Plasma::ServiceJob *job)
{
    if (job->operationName() == "GetSourceNames") {
        kDebug() << "get source names";
        QStringList oldsources = m_sources;
        m_sources = job->result().toStringList();

        //first check if there are sources that have to be removed:
        foreach (const QString &source, oldsources) {
            if (!m_sources.contains(source)) {
                kDebug() << "source no longer exists... remove that data.";
                removeAllData(source);
            }
        }

        //are there sources that have to be added?
        foreach (const QString &source, m_sources) {
            if (!oldsources.contains(source)) {
                kDebug() << "new source = " << source;
                setData(source, DataEngine::Data());
            }
        }
    } else if (job->operationName() == "GetSource") {
        QString source = job->parameters().value("SourceName").toString();
        kDebug() << "setting data for " << source;
        if (m_sources.contains(source)) {
            if (job->result().type() == QVariant::Bool && job->result().toBool() == false) {
                kDebug() << "there is no update";
            } else {
                setData(source,
                        static_cast<Plasma::DataEngine::Data>(job->result().toHash()));
            }
        }
    } else {
        QString source = job->parameters().value("SourceName").toString();
        kDebug() << "setting serviceForSource for " << source;
        QString resource = job->result().toString();
        KUrl loc = m_location;
        loc.setFileName(resource);
        if (m_serviceForSource.contains(source)) {
            m_serviceForSource[source]->setLocation(loc);
        } else {
            kDebug() << "no such service?";
        }
    }
}

bool RemoteDataEngine::updateSourceEvent(const QString &source)
{
    if (m_callInProgress) {
        return false;
    }
    KConfigGroup op = m_service->operationDescription("GetSource");
    op.writeEntry("SourceName", source);
    op.writeEntry("UUID", m_uuid);
    m_service->startOperationCall(op);
    return false;
}

bool RemoteDataEngine::sourceRequestEvent(const QString &source)
{
    if (m_callInProgress) {
        return false;
    }

    KConfigGroup op = m_service->operationDescription("GetSource");
    op.writeEntry("SourceName", source);
    op.writeEntry("UUID", m_uuid);
    m_service->startOperationCall(op);
    return false;
}

void RemoteDataEngine::updateSources()
{
    if (m_callInProgress) {
        return;
    }
    if (m_service) {
        KConfigGroup op = m_service->operationDescription("GetSourceNames");
        m_service->startOperationCall(op);
    }
}

}

#include "remotedataengine.moc"