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#include <QtTest/QtTest>
#include <private/qlistmodelinterface_p.h>
#include <qmlview.h>
#include <private/qmlgraphicslayoutitem_p.h>
#include <qmlexpression.h>
#include <QStyle>

class tst_QmlGraphicsLayouts : public QObject
{
    Q_OBJECT
public:
    tst_QmlGraphicsLayouts();

private slots:
    void test_qml();//GraphicsLayout set up in Qml
    void test_cpp();//GraphicsLayout set up in C++

private:
    QmlView *createView(const QString &filename);
};

tst_QmlGraphicsLayouts::tst_QmlGraphicsLayouts()
{
}

void tst_QmlGraphicsLayouts::test_qml()
{
    QmlView *canvas = createView(SRCDIR "/data/layouts.qml");

    canvas->execute();
    qApp->processEvents();
    QmlGraphicsLayoutItem *left = static_cast<QmlGraphicsLayoutItem*>(canvas->root()->findChild<QmlGraphicsItem*>("left"));
    QVERIFY(left != 0);

    QmlGraphicsLayoutItem *right = static_cast<QmlGraphicsLayoutItem*>(canvas->root()->findChild<QmlGraphicsItem*>("right"));
    QVERIFY(right != 0);

    qreal l = QApplication::style()->pixelMetric(QStyle::PM_LayoutLeftMargin);
    qreal r = QApplication::style()->pixelMetric(QStyle::PM_LayoutRightMargin);
    qreal t = QApplication::style()->pixelMetric(QStyle::PM_LayoutTopMargin);
    qreal b = QApplication::style()->pixelMetric(QStyle::PM_LayoutBottomMargin);
    QVERIFY2(l == r && r == t && t == b, "Test assumes equal margins.");
    qreal gvMargin = l;
    //Preferred Size
    canvas->root()->setWidth(300 + 2*gvMargin);
    canvas->root()->setHeight(300 + 2*gvMargin);

    QCOMPARE(left->x(), gvMargin);
    QCOMPARE(left->y(), gvMargin);
    QCOMPARE(left->width(), 100.0);
    QCOMPARE(left->height(), 300.0);

    QCOMPARE(right->x(), 100.0 + gvMargin);
    QCOMPARE(right->y(), 0.0 + gvMargin);
    QCOMPARE(right->width(), 200.0);
    QCOMPARE(right->height(), 300.0);

    //Minimum Size
    canvas->root()->setWidth(10+2*gvMargin);
    canvas->root()->setHeight(10+2*gvMargin);

    QCOMPARE(left->x(), gvMargin);
    QCOMPARE(left->width(), 100.0);
    QCOMPARE(left->height(), 100.0);

    QCOMPARE(right->x(), 100.0 + gvMargin);
    QCOMPARE(right->width(), 100.0);
    QCOMPARE(right->height(), 100.0);

    //Between preferred and Maximum Size
    /*Note that if set to maximum size (or above) GraphicsLinearLayout behavior
      is to shrink them down to preferred size. So the exact maximum size can't
      be used*/
    canvas->root()->setWidth(670 + 2*gvMargin);
    canvas->root()->setHeight(300 + 2*gvMargin);

    QCOMPARE(left->x(), gvMargin);
    QCOMPARE(left->width(), 270.0);
    QCOMPARE(left->height(), 300.0);

    QCOMPARE(right->x(), 270.0 + gvMargin);
    QCOMPARE(right->width(), 400.0);
    QCOMPARE(right->height(), 300.0);

    delete canvas;
}

void tst_QmlGraphicsLayouts::test_cpp()
{
    //TODO: Waiting on QT-2407 to write this test
}

QmlView *tst_QmlGraphicsLayouts::createView(const QString &filename)
{
    QmlView *canvas = new QmlView(0);

    QFile file(filename);
    file.open(QFile::ReadOnly);
    QString qml = file.readAll();
    canvas->setQml(qml, filename);

    return canvas;
}


QTEST_MAIN(tst_QmlGraphicsLayouts)

#include "tst_layouts.moc"