/*
 *   Copyright 2008 by Aaron Seigo <aseigo@kde.org>
 *   Copyright 2008 by Petri Damsten <damu@iki.fi>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library General Public License as
 *   published by the Free Software Foundation; either version 2, 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 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 "contextaction.h"
#include "containment.h"

#include <QAction>

#include <kdebug.h>
#include <kglobal.h>
#include <kservicetypetrader.h>
#include <kstandarddirs.h>

#include <version.h>

#include "plasma/private/dataengineconsumer_p.h"
#include "plasma/private/packages_p.h"
#include "plasma/private/contextaction_p.h"

namespace Plasma
{

PackageStructure::Ptr ContextActionPrivate::s_packageStructure(0);

ContextAction::ContextAction(QObject * parentObject)
    : d(new ContextActionPrivate(KService::serviceByStorageId(QString()), this))
{
    setParent(parentObject);
}

ContextAction::ContextAction(QObject *parentObject, const QVariantList &args)
    : d(new ContextActionPrivate(KService::serviceByStorageId(args.count() > 0 ?
                             args[0].toString() : QString()), this))
{
    // now remove first item since those are managed by Wallpaper and subclasses shouldn't
    // need to worry about them. yes, it violates the constness of this var, but it lets us add
    // or remove items later while applets can just pretend that their args always start at 0
    QVariantList &mutableArgs = const_cast<QVariantList &>(args);
    if (!mutableArgs.isEmpty()) {
        mutableArgs.removeFirst();
    }

    setParent(parentObject);
}

ContextAction::~ContextAction()
{
    delete d;
}

KPluginInfo::List ContextAction::listContextActionInfo()
{
    QString constraint;

    KService::List offers = KServiceTypeTrader::self()->query("Plasma/ContextAction", constraint);
    return KPluginInfo::fromServices(offers);
}

ContextAction *ContextAction::load(const QString &contextActionName, const QVariantList &args)
{
    if (contextActionName.isEmpty()) {
        return 0;
    }

    QString constraint = QString("[X-KDE-PluginInfo-Name] == '%1'").arg(contextActionName);
    KService::List offers = KServiceTypeTrader::self()->query("Plasma/ContextAction", constraint);

    if (offers.isEmpty()) {
        kDebug() << "offers is empty for " << contextActionName;
        return 0;
    }

    KService::Ptr offer = offers.first();
    KPluginLoader plugin(*offer);

    if (!Plasma::isPluginVersionCompatible(plugin.pluginVersion())) {
        return 0;
    }

    QVariantList allArgs;
    allArgs << offer->storageId() << args;
    QString error;
    ContextAction *contextAction = offer->createInstance<Plasma::ContextAction>(0, allArgs, &error);

    if (!contextAction) {
        kDebug() << "Couldn't load contextAction \"" << contextActionName << "\"! reason given: " << error;
    }

    return contextAction;
}

ContextAction *ContextAction::load(const KPluginInfo &info, const QVariantList &args)
{
    if (!info.isValid()) {
        return 0;
    }
    return load(info.pluginName(), args);
}

PackageStructure::Ptr ContextAction::packageStructure()
{
    if (!ContextActionPrivate::s_packageStructure) {
        ContextActionPrivate::s_packageStructure = new ContextActionPackage();
    }

    return ContextActionPrivate::s_packageStructure;
}

Containment *ContextAction::containment()
{
    return qobject_cast<Plasma::Containment*>(parent());
}

QString ContextAction::name() const
{
    if (!d->contextActionDescription.isValid()) {
        return i18n("Unknown ContextAction");
    }

    return d->contextActionDescription.name();
}

QString ContextAction::icon() const
{
    if (!d->contextActionDescription.isValid()) {
        return QString();
    }

    return d->contextActionDescription.icon();
}

QString ContextAction::pluginName() const
{
    if (!d->contextActionDescription.isValid()) {
        return QString();
    }

    return d->contextActionDescription.pluginName();
}

bool ContextAction::isInitialized() const
{
    return d->initialized;
}

void ContextAction::restore(const KConfigGroup &config)
{
    init(config);
    d->initialized = true;
}

void ContextAction::init(const KConfigGroup &config)
{
    Q_UNUSED(config);
}

void ContextAction::save(KConfigGroup &config)
{
    Q_UNUSED(config);
}

QWidget *ContextAction::createConfigurationInterface(QWidget *parent)
{
    Q_UNUSED(parent);
    return 0;
}

void ContextAction::contextEvent(QGraphicsSceneMouseEvent *event)
{
    Q_UNUSED(event)
}

void ContextAction::wheelEvent(QGraphicsSceneWheelEvent *event)
{
    Q_UNUSED(event)
}

QList<QAction*> ContextAction::contextualActions()
{
    //empty list
    return QList<QAction*>();
}

DataEngine *ContextAction::dataEngine(const QString &name) const
{
    return d->dataEngine(name);
}

bool ContextAction::configurationRequired() const
{
    return d->needsConfig;
}

QAction *ContextAction::configurationAction()
{
    if (d->needsConfig) {
        //create the "I need configuring" action
        QAction *action = new QAction(i18n("This plugin needs to be configured"), this);
        //TODO name/reason?
        //TODO connect it to something
        return action;
    }
    return NULL;
}

void ContextAction::setConfigurationRequired(bool needsConfig, const QString &reason)
{
    //TODO: implement something for reason. first, we need to decide where/how
    //      to communicate it to the user
    Q_UNUSED(reason)

    if (d->needsConfig == needsConfig) {
        return;
    }

    d->needsConfig = needsConfig;
}

} // Plasma namespace

#include "contextaction.moc"