/**
 * @file test_qt6_compatibility.cpp
 * @brief Tests für Qt6-Kompatibilitätsfixes
 *
 * Tests verify that:
 * 1. QRandomGenerator works correctly (replacing qrand())
 * 2. QChar conversions work with static_cast<ushort>
 * 3. Qt6 APIs function correctly
 */

#include <QChar>
#include <QRandomGenerator>
#include <QString>
#include <QStringView>
#include <QVector>
#include <gtest/gtest.h>

// Test 1: QRandomGenerator basic functionality
TEST(Qt6Compatibility, QRandomGeneratorBasic)
{
    // Test bounded random number generation (Qt6 replacement for qrand() % n)
    auto* generator = QRandomGenerator::global();
    ASSERT_NE(generator, nullptr);

    int value = generator->bounded(100);
    EXPECT_GE(value, 0);
    EXPECT_LT(value, 100);
}

// Test 2: QRandomGenerator seeded generation
TEST(Qt6Compatibility, QRandomGeneratorSeeded)
{
    QRandomGenerator generator(42); // Fixed seed for reproducibility
    int value1 = generator.bounded(1000);

    QRandomGenerator generator2(42); // Same seed
    int value2 = generator2.bounded(1000);

    EXPECT_EQ(value1, value2); // Should produce same sequence
}

// Test 3: QChar construction with static_cast<ushort>
TEST(Qt6Compatibility, QCharConstruction)
{
    // Qt6 has stricter QChar constructors
    char c = 'A';
    QChar qchar = QChar(static_cast<ushort>(c));
    EXPECT_EQ(qchar, QChar('A'));
}

// Test 4: QChar Unicode handling
TEST(Qt6Compatibility, QCharUnicode)
{
    // Test Unicode character handling in Qt6
    QChar unicodeChar(0x00E9); // é
    EXPECT_EQ(unicodeChar.unicode(), 0x00E9);

    QString str(unicodeChar);
    EXPECT_EQ(str, QString("é"));
}

// Test 5: QVector with Qt6
TEST(Qt6Compatibility, QVectorBasic)
{
    QVector<int> vec;
    vec.append(1);
    vec.append(2);
    vec.append(3);

    EXPECT_EQ(vec.size(), 3);
    EXPECT_EQ(vec[0], 1);
    EXPECT_EQ(vec.contains(2), true);
}

// Test 6: QString Qt6 compatibility
TEST(Qt6Compatibility, QStringBasic)
{
    QString str = "Hello Qt6";
    EXPECT_EQ(str.length(), 9);
    EXPECT_TRUE(str.contains("Qt6"));

    // Test Qt6 string methods - use QStringView instead of toStdStringView
    QStringView view = str;
    EXPECT_EQ(view.size(), 9);
}