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#include "propertywatcher.h"
#include <QApplication>
#include <QScreen>
#include <QWindow>
#include <QDebug>
#include <QFormLayout>
#include <QLineEdit>
#include <QDesktopWidget>

int i = 0;

typedef QHash<QScreen*, PropertyWatcher*> ScreensHash;
Q_GLOBAL_STATIC(ScreensHash, props);

void updateSiblings(PropertyWatcher* w)
{
    QLineEdit *siblingsField = w->findChild<QLineEdit *>("siblings");
    QScreen* screen = (QScreen*)w->subject();
    QStringList siblingsList;
    foreach (QScreen *sibling, screen->virtualSiblings())
        siblingsList << sibling->name();
    siblingsField->setText(siblingsList.join(", "));
}

void screenAdded(QScreen* screen)
{
    screen->setOrientationUpdateMask((Qt::ScreenOrientations)0x0F);
    qDebug("\nscreenAdded %s siblings %d first %s", qPrintable(screen->name()), screen->virtualSiblings().count(),
        (screen->virtualSiblings().isEmpty() ? "none" : qPrintable(screen->virtualSiblings().first()->name())));
    PropertyWatcher *w = new PropertyWatcher(screen, QString::number(i++));
    QLineEdit *siblingsField = new QLineEdit();
    siblingsField->setObjectName("siblings");
    siblingsField->setReadOnly(true);
    w->layout()->insertRow(0, "virtualSiblings", siblingsField);
    updateSiblings(w);

    // Set the screen via QDesktopWidget. This corresponds to setScreen() for the underlying
    // QWindow. This is essential when having separate X screens since the the positioning below is
    // not sufficient to get the windows show up on the desired screen.
    QList<QScreen *> screens = QGuiApplication::screens();
    int screenNumber = screens.indexOf(screen);
    Q_ASSERT(screenNumber >= 0);
    w->setParent(qApp->desktop()->screen(screenNumber));

    w->show();

    // Position the windows so that they end up at the center of the corresponding screen.
    QRect geom = w->geometry();
    geom.setSize(w->sizeHint());
    if (geom.height() > screen->geometry().height())
        geom.setHeight(screen->geometry().height() * 9 / 10);
    geom.moveCenter(screen->geometry().center());
    w->setGeometry(geom);

    props->insert(screen, w);

    // workaround for the fact that virtualSiblings is not a property,
    // thus there is no change notification:
    // allow the user to update the field manually
    QObject::connect(w, &PropertyWatcher::updatedAllFields, &updateSiblings);
}

void screenRemoved(QScreen* screen)
{
    delete props->take(screen);
}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QList<QScreen *> screens = QGuiApplication::screens();
    foreach (QScreen *screen, screens)
        screenAdded(screen);
    QObject::connect((const QGuiApplication*)QGuiApplication::instance(), &QGuiApplication::screenAdded, &screenAdded);
    QObject::connect((const QGuiApplication*)QGuiApplication::instance(), &QGuiApplication::screenRemoved, &screenRemoved);
    return a.exec();
}