/*
    Copyright 2009 Harald Fernengel <harry@kdevelop.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 "iokitmanager.h"
#include "iokitdevice.h"

#include <QtCore/qdebug.h>

#include <IOKit/IOKitLib.h>
#include <IOKit/usb/IOUSBLib.h>
#include <IOKit/network/IOEthernetInterface.h>

#include <CoreFoundation/CoreFoundation.h>

namespace Solid
{
namespace Backends
{
namespace IOKit
{

class IOKitManagerPrivate
{
public:
    inline IOKitManagerPrivate()
        : port(0), source(0)
    {}

    IONotificationPortRef port;
    CFRunLoopSourceRef source;

    static const char *typeToName(Solid::DeviceInterface::Type type);
    static QStringList devicesFromRegistry(io_iterator_t it);

    QSet<Solid::DeviceInterface::Type> supportedInterfaces;
};

// gets all registry pathes from an iterator
QStringList IOKitManagerPrivate::devicesFromRegistry(io_iterator_t it)
{
    QStringList result;
    io_object_t obj;
    io_string_t pathName;
    while ((obj = IOIteratorNext(it))) {
        kern_return_t ret = IORegistryEntryGetPath(obj, kIOServicePlane, pathName);
        if (ret != KERN_SUCCESS) {
            qWarning() << Q_FUNC_INFO << "IORegistryEntryGetPath failed";
            continue;
        }
        result += QString::fromUtf8(pathName);
        ret = IOObjectRelease(obj);
        if (ret != KERN_SUCCESS) {
            // very unlikely to happen - keep it a qDebug just in case.
            // compiler will nuke this code in release builds.
            qDebug() << Q_FUNC_INFO << "Unable to release object reference";
        }
    }
    IOObjectRelease(it);

    return result;
}

const char *IOKitManagerPrivate::typeToName(Solid::DeviceInterface::Type type)
{
    switch (type) {
    case Solid::DeviceInterface::Unknown:
        return 0;
    case Solid::DeviceInterface::Processor:
        return "AppleACPICPU";
    case Solid::DeviceInterface::Battery:
        return "AppleSmartBattery";

        //Solid::DeviceInterface::GenericInterface:
        //Solid::DeviceInterface::Block:
        //Solid::DeviceInterface::StorageAccess:
        //Solid::DeviceInterface::StorageDrive:
        //Solid::DeviceInterface::OpticalDrive:
        //Solid::DeviceInterface::StorageVolume:
        //Solid::DeviceInterface::OpticalDisc:
        //Solid::DeviceInterface::Camera:
        //Solid::DeviceInterface::PortableMediaPlayer:
    }

    return 0;
}

IOKitManager::IOKitManager(QObject *parent)
    : Solid::Ifaces::DeviceManager(parent), d(new IOKitManagerPrivate)
{
    d->port = IONotificationPortCreate(kIOMasterPortDefault);
    if (!d->port) {
        qWarning() << Q_FUNC_INFO << "Unable to create notification port";
        return;
    }

    d->source = IONotificationPortGetRunLoopSource(d->port);
    if (!d->source) {
        qWarning() << Q_FUNC_INFO << "Unable to create notification source";
        return;
    }

    CFRunLoopAddSource(CFRunLoopGetCurrent(), d->source, kCFRunLoopDefaultMode);

    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::Battery;
}

IOKitManager::~IOKitManager()
{
    if (d->source) {
        CFRunLoopRemoveSource(CFRunLoopGetCurrent(), d->source, kCFRunLoopDefaultMode);
    }
    if (d->port) {
        IONotificationPortDestroy(d->port);
    }

    delete d;
}

QString IOKitManager::udiPrefix() const
{
    return QString(); //FIXME: We should probably use a prefix there... has to be tested on Mac
}

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

QStringList IOKitManager::allDevices()
{
    // use an IORegistry Iterator to iterate over all devices in the service plane

    io_iterator_t it;
    kern_return_t ret = IORegistryCreateIterator(
                            kIOMasterPortDefault,
                            kIOServicePlane,
                            kIORegistryIterateRecursively,
                            &it);
    if (ret != KERN_SUCCESS) {
        qWarning() << Q_FUNC_INFO << "unable to create iterator";
        return QStringList();
    }

    return IOKitManagerPrivate::devicesFromRegistry(it);
}

QStringList IOKitManager::devicesFromQuery(const QString &parentUdi,
        Solid::DeviceInterface::Type type)
{
    QStringList result;

    if (type == Solid::DeviceInterface::Unknown) {
        // match all device interfaces
        result = allDevices();
    } else {
        const char *deviceClassName = IOKitManagerPrivate::typeToName(type);
        if (!deviceClassName) {
            return QStringList();
        }

        CFMutableDictionaryRef matchingDict = IOServiceMatching(deviceClassName);

        if (!matchingDict) {
            return QStringList();
        }

        io_iterator_t it = 0;

        // note - IOServiceGetMatchingServices dereferences the dict
        kern_return_t ret = IOServiceGetMatchingServices(
                                kIOMasterPortDefault,
                                matchingDict,
                                &it);

        result = IOKitManagerPrivate::devicesFromRegistry(it);
    }

    // if the parentUdi is an empty string, return all matches
    if (parentUdi.isEmpty()) {
        return result;
    }

    // return only matches that start with the parent's UDI
    QStringList filtered;
    Q_FOREACH (const QString &udi, result) {
        if (udi.startsWith(parentUdi)) {
            filtered += udi;
        }
    }

    return filtered;
}

QObject *IOKitManager::createDevice(const QString &udi)
{
    io_registry_entry_t entry = IORegistryEntryFromPath(
                                    kIOMasterPortDefault,
                                    udi.toLocal8Bit().constData());

    // we have to do IOObjectConformsTo - comparing the class names is not good enough
    //if (IOObjectConformsTo(entry, kIOEthernetInterfaceClass)) {
    //}

    if (entry == MACH_PORT_NULL) {
        return 0;
    }

    return new IOKitDevice(udi, entry);
}

}
}
} // namespaces

