/*
    Copyright 2005,2006 Kevin Ottens <ervin@kde.org>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) version 3, or any
    later version accepted by the membership of KDE e.V. (or its
    successor approved by the membership of KDE e.V.), which shall
    act as a proxy defined in Section 6 of version 3 of the license.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/

#include "halmanager.h"
#include "haldevice.h"
#include "haldeviceinterface.h"

#include <QtCore/QDebug>
#include <QtDBus/QDBusConnection>
#include <QtDBus/QDBusInterface>
#include <QtDBus/QDBusReply>

using namespace Solid::Backends::Hal;

class Solid::Backends::Hal::HalManagerPrivate
{
public:
    HalManagerPrivate() : manager("org.freedesktop.Hal",
                                   "/org/freedesktop/Hal/Manager",
                                   "org.freedesktop.Hal.Manager",
                                   QDBusConnection::systemBus()),
                          cacheSynced(false) { }

    QDBusInterface manager;
    QList<QString> devicesCache;
    bool cacheSynced;
    QSet<Solid::DeviceInterface::Type> supportedInterfaces;
};


HalManager::HalManager(QObject *parent)
    : DeviceManager(parent),  d(new HalManagerPrivate())
{
    d->manager.connection().connect("org.freedesktop.Hal",
                                     "/org/freedesktop/Hal/Manager",
                                     "org.freedesktop.Hal.Manager",
                                     "DeviceAdded",
                                     this, SLOT(slotDeviceAdded(QString)));

    d->manager.connection().connect("org.freedesktop.Hal",
                                     "/org/freedesktop/Hal/Manager",
                                     "org.freedesktop.Hal.Manager",
                                     "DeviceRemoved",
                                     this, SLOT(slotDeviceRemoved(QString)));

    d->supportedInterfaces << Solid::DeviceInterface::GenericInterface
                           << Solid::DeviceInterface::Processor
                           << Solid::DeviceInterface::Block
                           << Solid::DeviceInterface::StorageAccess
                           << Solid::DeviceInterface::StorageDrive
                           << Solid::DeviceInterface::OpticalDrive
                           << Solid::DeviceInterface::StorageVolume
                           << Solid::DeviceInterface::OpticalDisc
                           << Solid::DeviceInterface::Camera
                           << Solid::DeviceInterface::PortableMediaPlayer
                           << Solid::DeviceInterface::NetworkInterface
                           << Solid::DeviceInterface::AcAdapter
                           << Solid::DeviceInterface::Battery
                           << Solid::DeviceInterface::Button
                           << Solid::DeviceInterface::AudioInterface
                           << Solid::DeviceInterface::DvbInterface
                           << Solid::DeviceInterface::Video
                           << Solid::DeviceInterface::SerialInterface
                           << Solid::DeviceInterface::SmartCardReader;
}

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

QString HalManager::udiPrefix() const
{
    return "/org/freedesktop/Hal";
}

QSet<Solid::DeviceInterface::Type> HalManager::supportedInterfaces() const
{
    return d->supportedInterfaces;
}

QStringList HalManager::allDevices()
{
    if (d->cacheSynced)
    {
        return d->devicesCache;
    }

    QDBusReply<QStringList> reply = d->manager.call("GetAllDevices");

    if (!reply.isValid())
    {
        qWarning() << Q_FUNC_INFO << " error: " << reply.error().name() << endl;
        return QStringList();
    }

    d->devicesCache = reply;
    d->cacheSynced = true;

    return reply;
}

bool HalManager::deviceExists(const QString &udi)
{
    if (d->devicesCache.contains(udi))
    {
        return true;
    }
    else if (d->cacheSynced)
    {
        return false;
    }

    QDBusReply<bool> reply = d->manager.call("DeviceExists", udi);

    if (!reply.isValid())
    {
        qWarning() << Q_FUNC_INFO << " error: " << reply.error().name() << endl;
        return false;
    }

    if (reply)
    {
        d->devicesCache.append(udi);
    }

    return reply;
}

QStringList HalManager::devicesFromQuery(const QString &parentUdi,
                                         Solid::DeviceInterface::Type type)
{
    if (!parentUdi.isEmpty())
    {
        QStringList result = findDeviceStringMatch("info.parent", parentUdi);

        if (type!=Solid::DeviceInterface::Unknown) {
            const QStringList matches = result;
            result.clear();

            foreach (const QString &match, matches) {
                HalDevice device(match);

                if (device.queryDeviceInterface(type)) {
                    result << match;
                }
            }
        }

        return result;

    } else if (type!=Solid::DeviceInterface::Unknown) {
        return findDeviceByDeviceInterface(type);
    } else {
        return allDevices();
    }
}

QObject *HalManager::createDevice(const QString &udi)
{
    if (deviceExists(udi)) {
        return new HalDevice(udi);
    } else {
        return 0;
    }
}

QStringList HalManager::findDeviceStringMatch(const QString &key, const QString &value)
{
    QDBusReply<QStringList> reply = d->manager.call("FindDeviceStringMatch", key, value);

    if (!reply.isValid())
    {
        qWarning() << Q_FUNC_INFO << " error: " << reply.error().name() << endl;
        return QStringList();
    }

    return reply;
}

QStringList HalManager::findDeviceByDeviceInterface(Solid::DeviceInterface::Type type)
{
    QStringList cap_list = DeviceInterface::toStringList(type);
    QStringList result;

    foreach (const QString &cap, cap_list)
    {
        QDBusReply<QStringList> reply = d->manager.call("FindDeviceByCapability", cap);

        if (!reply.isValid())
        {
            qWarning() << Q_FUNC_INFO << " error: " << reply.error().name() << endl;
            return QStringList();
        }
        if ( cap == QLatin1String( "video4linux" ) )
        {
            QStringList foundDevices ( reply );
            QStringList filtered;
            foreach ( const QString &udi, foundDevices )
            {
                QDBusInterface device( "org.freedesktop.Hal", udi, "org.freedesktop.Hal.Device", QDBusConnection::systemBus() );
                QDBusReply<QString> reply = device.call( "GetProperty", "video4linux.device" );
                if (!reply.isValid())
                {
                    qWarning() << Q_FUNC_INFO << " error getting video4linux.device: " << reply.error().name() << endl;
                    continue;
                }
                if ( !reply.value().contains( "video" ) )
                {
                    continue;
                }
                filtered.append( udi );
            }
            result += filtered;
        }
        else
        {
            result << reply;
        }
    }

    return result;
}

void HalManager::slotDeviceAdded(const QString &udi)
{
    d->devicesCache.append(udi);
    emit deviceAdded(udi);
}

void HalManager::slotDeviceRemoved(const QString &udi)
{
    d->devicesCache.removeAll(udi);
    emit deviceRemoved(udi);
}

#include "backends/hal/halmanager.moc"
