// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#include <QtQuickTestUtils/private/qmlutils_p.h>
#include <QtTest/qtest.h>
#include <QQmlEngine>
#include <QtQuick/qquickitem.h>
#include <QtQuickTemplates2/private/qquickdeferredexecute_p_p.h>
#include <QQmlIncubator>

class DeferredPropertyTester : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QQuickItem *objectProperty READ objectProperty WRITE setObjectProperty NOTIFY objectChanged)
    Q_CLASSINFO("DeferredPropertyNames", "objectProperty")

public:
    DeferredPropertyTester() {}


    QQuickItem *objectProperty() {

        if (!m_object.wasExecuted()) {
            quickBeginDeferred(this, "objectProperty", m_object);
            quickCompleteDeferred(this, "objectProperty", m_object);
        }

        return m_object;
    }
    void setObjectProperty(QQuickItem *obj) {
        if (m_object == obj)
            return;
        m_object = obj;
        if (!m_object.isExecuting()) // first read
            emit objectChanged();
    }

signals:
    void objectChanged();

private:
    QQuickDeferredPointer<QQuickItem> m_object = nullptr;
};

class tst_qquickdeferred : public QQmlDataTest
{
    Q_OBJECT
public:
    tst_qquickdeferred() : QQmlDataTest(QT_QMLTEST_DATADIR) {}
private slots:
    void noSpuriousBinding();
    void abortedIncubation();
};



void tst_qquickdeferred::noSpuriousBinding() {
    QTest::failOnWarning(QRegularExpression(QLatin1StringView(".*Binding loop detected.*")));
    qmlRegisterType<DeferredPropertyTester>("test", 1, 0, "DeferredPropertyTester");

    QQmlEngine engine;
    QQmlComponent comp(&engine, testFileUrl("noSpuriousBinding.qml"));
    std::unique_ptr<QObject> root(comp.create());
    QVERIFY2(root, qPrintable(comp.errorString()));
    root->setProperty("toggle", false);
}

// QTBUG-116828
// This test checks the case where we cancel incubation of a componet with a deferred property
// Components that have deferred properties should also provide an itemDestoryed method that
// that resets the deferred property to null to prevent issues with dangling pointers.
void tst_qquickdeferred::abortedIncubation()
{
    QQmlEngine engine;
    QQmlIncubationController controller;
    engine.setIncubationController(&controller);

    {
        QQmlIncubator incubator;
        QQmlComponent componet(&engine, testFileUrl("abortedIncubation.qml"));
        componet.create(incubator);
        controller.incubateFor(1);
        incubator.clear(); // abort incubation (and dont crash)
    }
}

QTEST_MAIN(tst_qquickdeferred)

#include "tst_qquickdeferred.moc"