/**
 * @RDE_HEADER@
 * Unit Tests for Qt6 API Migrations in SituationMap Module
 * $Id$
 * $HeadURL$
 * $Author$
 */

#include <gtest/gtest.h>
#include <QCoreApplication>
#include <QString>
#include <QStringView>
#include <QList>
#include <QVector>
#include <QFuture>
#include <QtConcurrent>
#include <QVariantMap>
#include <QMouseEvent>
#include <QTouchEvent>
#include <QWheelEvent>

// Test QStringView::sliced() API (Qt6 replacement for slice())
TEST(Qt6ApiTest, QStringView_Sliced)
{
    QString testString = QStringLiteral("Hello World");
    QStringView view(testString);
    
    // QBitArray::sliced() in Qt6 (was slice())
    QStringView subView = view.sliced(0, 5);
    EXPECT_EQ(subView.toString(), QStringLiteral("Hello"));
    
    QStringView subView2 = view.sliced(6);
    EXPECT_EQ(subView2.toString(), QStringLiteral("World"));
}

// Test QList/QVector equivalence in Qt6
TEST(Qt6ApiTest, QList_QVector_Equivalence)
{
    // In Qt6, QList and QVector are identical
    QList<int> list = {1, 2, 3, 4, 5};
    QVector<int> vector = {1, 2, 3, 4, 5};
    
    EXPECT_EQ(list.size(), vector.size());
    for (int i = 0; i < list.size(); ++i)
    {
        EXPECT_EQ(list[i], vector[i]);
    }
    
    // Test that ambiguous overloads are resolved
    auto processList = [](const QList<int>& data) { return data.size(); };
    auto processVector = [](const QVector<int>& data) { return data.size(); };
    
    EXPECT_EQ(processList(list), 5);
    EXPECT_EQ(processVector(vector), 5);
}

// Test QFuture continuation pattern
TEST(Qt6ApiTest, QFuture_Continuation)
{
    QFuture<int> future = QtConcurrent::run([]() {
        return 42;
    });
    
    QFuture<QString> continued = future.then([](QFuture<int> result) {
        return QString::number(result.result());
    });
    
    continued.waitForFinished();
    EXPECT_EQ(continued.result(), QStringLiteral("42"));
}

// Test Qt::MiddleButton enum (Qt6 replacement for Qt::MidButton)
TEST(Qt6ApiTest, Qt_MiddleButton_Enum)
{
    // Qt::MiddleButton in Qt6 (was MidButton)
    Qt::MouseButton middleBtn = Qt::MiddleButton;
    EXPECT_EQ(middleBtn, Qt::MiddleButton);
    EXPECT_NE(middleBtn, Qt::LeftButton);
    EXPECT_NE(middleBtn, Qt::RightButton);
}

// Test QVariantMap iteration (Qt6: unite() removed)
TEST(Qt6ApiTest, QVariantMap_Iteration)
{
    QVariantMap map1;
    map1.insert(QStringLiteral("key1"), 1);
    map1.insert(QStringLiteral("key2"), 2);
    
    QVariantMap map2;
    // QMap::unite() removed in Qt6
    for (auto it = map1.begin(); it != map1.end(); ++it)
    {
        map2.insert(it.key(), it.value());
    }
    
    EXPECT_EQ(map1.size(), map2.size());
    EXPECT_EQ(map1[QStringLiteral("key1")], map2[QStringLiteral("key1")]);
    EXPECT_EQ(map1[QStringLiteral("key2")], map2[QStringLiteral("key2")]);
}

// Test QTouchEvent API changes (Qt6)
TEST(Qt6ApiTest, QTouchEvent_API)
{
    // This test verifies the API exists - actual touch testing requires GUI
    // QTouchEvent::points() and QEventPoint::globalPosition() in Qt6
    
    // Create a mock test - in real code, QTouchEvent is created by system
    // We verify the types compile correctly
    using PointType = QEventPoint;
    
    // Verify QEventPoint has the expected Qt6 methods
    static_assert(std::is_same_v<decltype(&QEventPoint::position), QPointF(QEventPoint::*)() const>);
    static_assert(std::is_same_v<decltype(&QEventPoint::pressPosition), QPointF(QEventPoint::*)() const>);
    static_assert(std::is_same_v<decltype(&QEventPoint::globalPosition), QPointF(QEventPoint::*)() const>);
    
    SUCCEED() << "QEventPoint API types verified for Qt6";
}

// Test QMouseEvent position API (Qt6)
TEST(Qt6ApiTest, QMouseEvent_Position_API)
{
    // QMouseEvent::position() in Qt6 (was x()/y())
    // Create a mouse event with Qt6 API
    QMouseEvent event(QEvent::MouseButtonPress, 
                      QPointF(100.0, 200.0),  // globalPos
                      QPointF(100.0, 200.0),  // pos
                      Qt::LeftButton, 
                      Qt::LeftButton, 
                      Qt::NoModifier);
    
    // Qt6 API: position() returns QPointF
    EXPECT_DOUBLE_EQ(event.position().x(), 100.0);
    EXPECT_DOUBLE_EQ(event.position().y(), 200.0);
    
    // Qt6 API: globalPosition() returns QPointF
    EXPECT_DOUBLE_EQ(event.globalPosition().x(), 100.0);
    EXPECT_DOUBLE_EQ(event.globalPosition().y(), 200.0);
}

// Test QWheelEvent position API (Qt6)
TEST(Qt6ApiTest, QWheelEvent_Position_API)
{
    // QWheelEvent::position() in Qt6 (was x()/y())
    QWheelEvent event(QPointF(100.0, 200.0),  // pos
                      QPointF(100.0, 200.0),  // globalPos
                      QPoint(0, 0),           // pixelDelta
                      QPoint(0, 120),         // angleDelta
                      Qt::NoButton,
                      Qt::NoModifier,
                      Qt::NoScrollPhase,
                      false);
    
    // Qt6 API: position() returns QPointF
    EXPECT_DOUBLE_EQ(event.position().x(), 100.0);
    EXPECT_DOUBLE_EQ(event.position().y(), 200.0);
}

// Test std::list with Qt6 (no changes needed, but verify compatibility)
TEST(Qt6ApiTest, StdList_Compatibility)
{
    std::list<int> intList = {1, 2, 3, 4, 5};
    
    // Verify standard operations work
    EXPECT_EQ(intList.size(), 5u);
    EXPECT_EQ(intList.front(), 1);
    EXPECT_EQ(intList.back(), 5);
    
    intList.push_back(6);
    EXPECT_EQ(intList.size(), 6u);
}

// Test QSharedPointer (Qt6 compatible)
// Note: Qt6 QSharedPointer doesn't have use_count() - use isNull() and pointer comparison
TEST(Qt6ApiTest, QSharedPointer_Basic)
{
    QSharedPointer<int> ptr(new int(42));
    EXPECT_FALSE(ptr.isNull());
    EXPECT_EQ(*ptr, 42);
    
    QSharedPointer<int> ptr2 = ptr;
    EXPECT_FALSE(ptr.isNull());
    EXPECT_FALSE(ptr2.isNull());
    EXPECT_EQ(ptr.data(), ptr2.data());  // Both point to same object
    EXPECT_EQ(*ptr, *ptr2);  // Both access same value
}