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#include <QApplication>
#include <QQmlApplicationEngine>
#include <QtQml>
#include <QFileSystemModel>
#include <QDateTime>
#include <QDesktopServices>
#include <QUrl>

static inline QString permissionString(const QFileInfo &fi)
{
    const QFile::Permissions permissions = fi.permissions();
    QString result = QLatin1String("----------");
    if (fi.isSymLink())
        result[0] = QLatin1Char('l');
    else if (fi.isDir())
        result[0] = QLatin1Char('d');
    if (permissions & QFileDevice::ReadUser)
        result[1] = QLatin1Char('r');
    if (permissions & QFileDevice::WriteUser)
        result[2] = QLatin1Char('w');
    if (permissions & QFileDevice::ExeUser)
        result[3] = QLatin1Char('x');
    if (permissions & QFileDevice::ReadGroup)
        result[4] = QLatin1Char('r');
    if (permissions & QFileDevice::WriteGroup)
        result[5] = QLatin1Char('w');
    if (permissions & QFileDevice::ExeGroup)
        result[6] = QLatin1Char('x');
    if (permissions & QFileDevice::ReadOther)
        result[7] = QLatin1Char('r');
    if (permissions & QFileDevice::WriteOther)
        result[8] = QLatin1Char('w');
    if (permissions & QFileDevice::ExeOther)
        result[9] = QLatin1Char('x');
    return result;
}

static inline QString sizeString(const QFileInfo &fi)
{
    if (!fi.isFile())
        return QString();
    const qint64 size = fi.size();
    if (size > 1024 * 1024 * 10)
        return QString::number(size / (1024 * 1024)) + QLatin1Char('M');
    if (size > 1024 * 10)
        return QString::number(size / 1024) + QLatin1Char('K');
    return QString::number(size);
}

class DisplayFileSystemModel : public QFileSystemModel {
    Q_OBJECT
public:
    explicit DisplayFileSystemModel(QObject *parent = nullptr)
        : QFileSystemModel(parent) {}

    enum Roles  {
        SizeRole = Qt::UserRole + 4,
        DisplayableFilePermissionsRole = Qt::UserRole + 5,
        LastModifiedRole = Qt::UserRole + 6,
        UrlStringRole = Qt::UserRole + 7
    };
    Q_ENUM(Roles)

    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override
    {
        if (index.isValid() && role >= SizeRole) {
            switch (role) {
            case SizeRole:
                return QVariant(sizeString(fileInfo(index)));
            case DisplayableFilePermissionsRole:
                return QVariant(permissionString(fileInfo(index)));
            case LastModifiedRole:
                return QVariant(QLocale::system().toString(fileInfo(index).lastModified(), QLocale::ShortFormat));
            case UrlStringRole:
                return QVariant(QUrl::fromLocalFile(filePath(index)).toString());
            default:
                break;
            }
        }
        return QFileSystemModel::data(index, role);
    }

    QHash<int,QByteArray> roleNames() const override
    {
         QHash<int, QByteArray> result = QFileSystemModel::roleNames();
         result.insert(SizeRole, QByteArrayLiteral("size"));
         result.insert(DisplayableFilePermissionsRole, QByteArrayLiteral("displayableFilePermissions"));
         result.insert(LastModifiedRole, QByteArrayLiteral("lastModified"));
         return result;
    }
};

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QQmlApplicationEngine engine;
    qmlRegisterUncreatableType<DisplayFileSystemModel>("io.qt.examples.quick.controls.filesystembrowser", 1, 0,
                                                       "FileSystemModel", "Cannot create a FileSystemModel instance.");
    QFileSystemModel *fsm = new DisplayFileSystemModel(&engine);
    fsm->setRootPath(QDir::homePath());
    fsm->setResolveSymlinks(true);
    engine.rootContext()->setContextProperty("fileSystemModel", fsm);
    engine.rootContext()->setContextProperty("rootPathIndex", fsm->index(fsm->rootPath()));
    engine.load(QUrl(QStringLiteral("qrc:///main.qml")));
    if (engine.rootObjects().isEmpty())
        return -1;

    return app.exec();
}

#include "main.moc"