/****************************************************************************

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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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** This file contains pre-release code and may not be distributed.

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** contained in the Technology Preview License Agreement accompanying

** this package.

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** GNU Lesser General Public License Usage

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** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

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** $QT_END_LICENSE$

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****************************************************************************/

#include "qfactoryloader_p.h"

#if !defined (QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS)

#include "qfactoryinterface.h"

#include "qmap.h"

#include <qdir.h>

#include <qsettings.h>

#include <qdebug.h>

#include "qmutex.h"

#include "qplugin.h"

#include "qpluginloader.h"

#include "private/qobject_p.h"

#include "private/qcoreapplication_p.h"

QT_BEGIN_NAMESPACE

Q_GLOBAL_STATIC(QList<QFactoryLoader *>, qt_factory_loaders)

Q_GLOBAL_STATIC_WITH_ARGS(QMutex, qt_factoryloader_mutex, (QMutex::Recursive))

class QFactoryLoaderPrivate : public QObjectPrivate

{

    Q_DECLARE_PUBLIC(QFactoryLoader)

public:

    QFactoryLoaderPrivate(){}

    ~QFactoryLoaderPrivate();

    mutable QMutex mutex;

    QByteArray iid;

    QList<QLibraryPrivate*> libraryList;

    QMap<QString,QLibraryPrivate*> keyMap;

    QStringList keyList;

    QString suffix;

    Qt::CaseSensitivity cs;

    QStringList loadedPaths;

    void unloadPath(const QString &path);

};

QFactoryLoaderPrivate::~QFactoryLoaderPrivate()

{

    for (int i = 0; i < libraryList.count(); ++i)

        libraryList.at(i)->release();

}

QFactoryLoader::QFactoryLoader(const char *iid,

                               const QString &suffix,

                               Qt::CaseSensitivity cs)

    : QObject(*new QFactoryLoaderPrivate)

{

    moveToThread(QCoreApplicationPrivate::mainThread());

    Q_D(QFactoryLoader);

    d->iid = iid;

    d->cs = cs;

    d->suffix = suffix;

    QMutexLocker locker(qt_factoryloader_mutex());

    update();

    qt_factory_loaders()->append(this);

}

void QFactoryLoader::update()

{

#ifdef QT_SHARED

    Q_D(QFactoryLoader);

    QStringList paths = QCoreApplication::libraryPaths();

    QSettings settings(QSettings::UserScope, QLatin1String("Trolltech"));

    for (int i = 0; i < paths.count(); ++i) {

        const QString &pluginDir = paths.at(i);

        // Already loaded, skip it...

        if (d->loadedPaths.contains(pluginDir))

            continue;

        d->loadedPaths << pluginDir;

        QString path = pluginDir + d->suffix;

        if (!QDir(path).exists(QLatin1String(".")))

            continue;

        QStringList plugins = QDir(path).entryList(QDir::Files);

        QLibraryPrivate *library = 0;

        for (int j = 0; j < plugins.count(); ++j) {

            QString fileName = QDir::cleanPath(path + QLatin1Char('/') + plugins.at(j));

            if (qt_debug_component()) {

                qDebug() << "QFactoryLoader::QFactoryLoader() looking at" << fileName;

            }

            library = QLibraryPrivate::findOrCreate(QFileInfo(fileName).canonicalFilePath());

            if (!library->isPlugin(&settings)) {

                if (qt_debug_component()) {

                    qDebug() << library->errorString;

                    qDebug() << "         not a plugin";

                }

                library->release();

                continue;

            }

            QString regkey = QString::fromLatin1("Qt Factory Cache %1.%2/%3:/%4")

                             .arg((QT_VERSION & 0xff0000) >> 16)

                             .arg((QT_VERSION & 0xff00) >> 8)

                             .arg(QLatin1String(d->iid))

                             .arg(fileName);

            QStringList reg, keys;

            reg = settings.value(regkey).toStringList();

            if (reg.count() && library->lastModified == reg[0]) {

                keys = reg;

                keys.removeFirst();

            } else {

                if (!library->loadPlugin()) {

                    if (qt_debug_component()) {

                        qDebug() << library->errorString;

                        qDebug() << "           could not load";

                    }

                    library->release();

                    continue;

                }

                QObject *instance = library->instance();

                if (!instance)

                    // ignore plugins that have a valid signature but cannot be loaded.

                    continue;

                QFactoryInterface *factory = qobject_cast<QFactoryInterface*>(instance);

                if (instance && factory && instance->qt_metacast(d->iid))

                    keys = factory->keys();

                if (keys.isEmpty())

                    library->unload();

                reg.clear();

                reg << library->lastModified;

                reg += keys;

                settings.setValue(regkey, reg);

            }

            if (qt_debug_component()) {

                qDebug() << "keys" << keys;

            }

            if (keys.isEmpty()) {

                library->release();

                continue;

            }

            d->libraryList += library;

            for (int k = 0; k < keys.count(); ++k) {

                // first come first serve, unless the first

                // library was built with a future Qt version,

                // whereas the new one has a Qt version that fits

                // better

                QString key = keys.at(k);

                if (!d->cs)

                    key = key.toLower();

                QLibraryPrivate *previous = d->keyMap.value(key);

                if (!previous || (previous->qt_version > QT_VERSION && library->qt_version <= QT_VERSION)) {

                    d->keyMap[key] = library;

                    d->keyList += keys.at(k);

                }

            }

        }

    }

#else

    Q_D(QFactoryLoader);

    if (qt_debug_component()) {

        qDebug() << "QFactoryLoader::QFactoryLoader() ignoring" << d->iid

                 << "since plugins are disabled in static builds";

    }

#endif

}

QFactoryLoader::~QFactoryLoader()

{

    QMutexLocker locker(qt_factoryloader_mutex());

    qt_factory_loaders()->removeAll(this);

}

QStringList QFactoryLoader::keys() const

{

    Q_D(const QFactoryLoader);

    QMutexLocker locker(&d->mutex);

    QStringList keys = d->keyList;

    QObjectList instances = QPluginLoader::staticInstances();

    for (int i = 0; i < instances.count(); ++i)

        if (QFactoryInterface *factory = qobject_cast<QFactoryInterface*>(instances.at(i)))

            if (instances.at(i)->qt_metacast(d->iid))

                keys += factory->keys();

    return keys;

}

QObject *QFactoryLoader::instance(const QString &key) const

{

    Q_D(const QFactoryLoader);

    QMutexLocker locker(&d->mutex);

    QObjectList instances = QPluginLoader::staticInstances();

    for (int i = 0; i < instances.count(); ++i)

        if (QFactoryInterface *factory = qobject_cast<QFactoryInterface*>(instances.at(i)))

            if (instances.at(i)->qt_metacast(d->iid) && factory->keys().contains(key, Qt::CaseInsensitive))

                return instances.at(i);

    QString lowered = d->cs ? key : key.toLower();

    if (QLibraryPrivate* library = d->keyMap.value(lowered)) {

        if (library->instance || library->loadPlugin()) {

            if (QObject *obj = library->instance()) {

                if (obj && !obj->parent())

                    obj->moveToThread(QCoreApplicationPrivate::mainThread());

                return obj;

            }

        }

    }

    return 0;

}

void QFactoryLoader::refreshAll()

{

    QMutexLocker locker(qt_factoryloader_mutex());

    QList<QFactoryLoader *> *loaders = qt_factory_loaders();

    for (QList<QFactoryLoader *>::const_iterator it = loaders->constBegin();

         it != loaders->constEnd(); ++it) {

        (*it)->update();

    }

}

QT_END_NAMESPACE

#endif // QT_NO_LIBRARY