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** This file is part of the test suite of the Qt Toolkit.
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#include <QtTest/QtTest>
#include <qsizepolicy.h>

Q_DECLARE_METATYPE(Qt::Orientations)
Q_DECLARE_METATYPE(QSizePolicy)
Q_DECLARE_METATYPE(QSizePolicy::Policy)
Q_DECLARE_METATYPE(QSizePolicy::ControlType)

class tst_QSizePolicy : public QObject
{
    Q_OBJECT

private Q_SLOTS:
    void cleanup() { QVERIFY(QApplication::topLevelWidgets().isEmpty()); }
    void qtest();
    void constExpr();
    void defaultValues();
    void getSetCheck_data() { data(); }
    void getSetCheck();
    void transposed_data() { data(); }
    void transposed();
    void dataStream();
    void horizontalStretch();
    void verticalStretch();
    void qhash_data() { data(); }
    void qhash();
private:
    void data() const;
};


struct PrettyPrint {
    const char *m_s;
    template <typename T>
    explicit PrettyPrint(const T &t) : m_s(nullptr)
    {
        using QT_PREPEND_NAMESPACE(QTest)::toString;
        m_s = toString(t);
    }
    ~PrettyPrint() { delete[] m_s; }
    const char* s() const { return m_s ? m_s : "<null>" ; }
};

void tst_QSizePolicy::qtest()
{
#define CHECK(x) QCOMPARE(PrettyPrint(QSizePolicy::x).s(), #x)
    // Policy:
    CHECK(Fixed);
    CHECK(Minimum);
    CHECK(Ignored);
    CHECK(MinimumExpanding);
    CHECK(Expanding);
    CHECK(Maximum);
    CHECK(Preferred);
    // ControlType:
    CHECK(ButtonBox);
    CHECK(CheckBox);
    CHECK(ComboBox);
    CHECK(Frame);
    CHECK(GroupBox);
    CHECK(Label);
    CHECK(Line);
    CHECK(LineEdit);
    CHECK(PushButton);
    CHECK(RadioButton);
    CHECK(Slider);
    CHECK(SpinBox);
    CHECK(TabWidget);
    CHECK(ToolButton);
#undef CHECK
#define CHECK2(x, y) QCOMPARE(PrettyPrint(QSizePolicy::x|QSizePolicy::y).s(), \
                              QSizePolicy::x < QSizePolicy::y ? #x "|" #y : #y "|" #x)
    // ControlTypes (sample)
    CHECK2(ButtonBox, CheckBox);
    CHECK2(CheckBox, ButtonBox);
    CHECK2(ToolButton, Slider);
#undef CHECK2
}

void tst_QSizePolicy::constExpr()
{
/* gcc < 4.8.0 has problems with init'ing variant members in constexpr ctors */
/* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54922 */
#if !defined(Q_CC_GNU) || defined(Q_CC_INTEL) || defined(Q_CC_CLANG) || Q_CC_GNU >= 408
    // check that certain ctors are constexpr (compile-only):
    { Q_CONSTEXPR QSizePolicy sp; Q_UNUSED(sp); }
    { Q_CONSTEXPR QSizePolicy sp = QSizePolicy(); Q_UNUSED(sp); }
    { Q_CONSTEXPR QSizePolicy sp = QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Preferred); Q_UNUSED(sp); }
    { Q_CONSTEXPR QSizePolicy sp = QSizePolicy(QSizePolicy::Minimum, QSizePolicy::Expanding, QSizePolicy::DefaultType);
      Q_CONSTEXPR QSizePolicy tp = sp.transposed(); Q_UNUSED(tp); }
    {
      // QTBUG-69983: For ControlType != QSizePolicy::DefaultType, qCountTrailingZeroBits()
      // is used, which MSVC 15.8.1 does not consider constexpr due to built-ins
#  if defined(QT_HAS_CONSTEXPR_BUILTINS) && (!defined(Q_CC_MSVC) || _MSC_VER < 1915)
      Q_RELAXED_CONSTEXPR auto sp = QSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed, QSizePolicy::CheckBox);
#  else
      Q_CONSTEXPR auto sp = QSizePolicy(QSizePolicy::Minimum, QSizePolicy::Expanding, QSizePolicy::DefaultType);
#  endif
      Q_RELAXED_CONSTEXPR auto tp = sp.transposed(); Q_UNUSED(tp);
    }
#else
    QSKIP("QSizePolicy cannot be constexpr with this version of the compiler.");
#endif
}

void tst_QSizePolicy::defaultValues()
{
    {
        // check values of a default-constructed QSizePolicy
        QSizePolicy sp;
        QCOMPARE(sp.horizontalPolicy(), QSizePolicy::Fixed);
        QCOMPARE(sp.verticalPolicy(), QSizePolicy::Fixed);
        QCOMPARE(sp.horizontalStretch(), 0);
        QCOMPARE(sp.verticalStretch(), 0);
        QCOMPARE(sp.verticalStretch(), 0);
        QCOMPARE(sp.controlType(), QSizePolicy::DefaultType);
        QCOMPARE(sp.hasHeightForWidth(), false);
        QCOMPARE(sp.hasWidthForHeight(), false);
    }
}

#define FETCH_TEST_DATA \
    QFETCH(QSizePolicy, sp); \
    QFETCH(QSizePolicy::Policy, hp); \
    QFETCH(QSizePolicy::Policy, vp); \
    QFETCH(int, hst); \
    QFETCH(int, vst); \
    QFETCH(QSizePolicy::ControlType, ct); \
    QFETCH(bool, hfw); \
    QFETCH(bool, wfh); \
    QFETCH(Qt::Orientations, ed)


// Testing get/set functions
void tst_QSizePolicy::getSetCheck()
{
    FETCH_TEST_DATA;

    QCOMPARE(QPixmap(), QPixmap());

    QCOMPARE(sp.horizontalPolicy(),    hp);
    QCOMPARE(sp.verticalPolicy(),      vp);
    QCOMPARE(sp.horizontalStretch(),   hst);
    QCOMPARE(sp.verticalStretch(),     vst);
    QCOMPARE(sp.controlType(),         ct);
    QCOMPARE(sp.hasHeightForWidth(),   hfw);
    QCOMPARE(sp.hasWidthForHeight(),   wfh);
    QCOMPARE(sp.expandingDirections(), ed);
}

void tst_QSizePolicy::transposed()
{
    FETCH_TEST_DATA;

    const QSizePolicy tr = sp.transposed();

    QCOMPARE(tr.horizontalPolicy(),    vp);  // swapped
    QCOMPARE(tr.verticalPolicy(),      hp);  // swapped
    QCOMPARE(tr.horizontalStretch(),   vst); // swapped
    QCOMPARE(tr.verticalStretch(),     hst); // swapped
    QCOMPARE(tr.controlType(),         ct);  // not swapped
    QCOMPARE(tr.hasHeightForWidth(),   hfw); // not swapped (historic behavior)
    QCOMPARE(tr.hasWidthForHeight(),   wfh); // not swapped (historic behavior)
    QCOMPARE(tr.expandingDirections(), ed);  // swapped

    // destructive test - keep last:
    sp.transpose();
    QCOMPARE(sp, tr);
}

static void makeRow(QSizePolicy sp, QSizePolicy::Policy hp, QSizePolicy::Policy vp,
                    int hst, int vst, QSizePolicy::ControlType ct, bool hfw, bool wfh,
                    Qt::Orientations orients)
{
    QTest::addRow("%s-%s-%d-%d-%s-%s-%s",
                  PrettyPrint(hp).s(), PrettyPrint(vp).s(), hst, vst,
                  PrettyPrint(ct).s(),
                  hfw ? "true" : "false", wfh ? "true" : "false")
            << sp << hp << vp << hst << vst << ct << hfw << wfh << orients;
}

void tst_QSizePolicy::data() const
{
    QTest::addColumn<QSizePolicy>("sp");
    QTest::addColumn<QSizePolicy::Policy>("hp");
    QTest::addColumn<QSizePolicy::Policy>("vp");
    QTest::addColumn<int>("hst");
    QTest::addColumn<int>("vst");
    QTest::addColumn<QSizePolicy::ControlType>("ct");
    QTest::addColumn<bool>("hfw");
    QTest::addColumn<bool>("wfh");
    QTest::addColumn<Qt::Orientations>("ed");

    {
        static const QSizePolicy::Policy policies[3] = {
            QSizePolicy::Fixed,
            QSizePolicy::Minimum,
            QSizePolicy::Ignored
        };
        static const QSizePolicy::ControlType controlTypes[4] = {
            QSizePolicy::DefaultType,
            QSizePolicy::ButtonBox,
            QSizePolicy::CheckBox,
            QSizePolicy::ToolButton
        };

#define ITEMCOUNT(arr) int(sizeof(arr)/sizeof(arr[0]))
        QSizePolicy sp, oldsp;
#ifdef GENERATE_BASELINE
        QFile out(QString::fromAscii("qsizepolicy-Qt%1%2.txt").arg((QT_VERSION >> 16) & 0xff).arg((QT_VERSION) >> 8 & 0xff));
        if (out.open(QIODevice::WriteOnly | QIODevice::Truncate)) {
            QDataStream stream(&out);
#endif
            /* Loop for permutating over the values most likely to trigger a bug:
              - mininumum, maximum values
              - Some values with LSB set, others with MSB unset. (check if shifts are ok)

            */
            // Look specifically for
            for (int ihp = 0; ihp < ITEMCOUNT(policies); ++ihp) {
                QSizePolicy::Policy hp = policies[ihp];
                for (int ivp = 0; ivp < ITEMCOUNT(policies); ++ivp) {
                    QSizePolicy::Policy vp = policies[ivp];
                    for (int ict = 0; ict < ITEMCOUNT(controlTypes); ++ict) {
                        QSizePolicy::ControlType ct = controlTypes[ict];
                        for (int hst= 0; hst <= 255; hst+=85) {         //[0,85,170,255]
                            for (int vst = 0; vst <= 255; vst+=85) {
                                for (int j = 0; j < 3; ++j) {
                                    bool hfw = j & 1;
                                    bool wfh = j & 2;   // cannot set hfw and wfh at the same time
                                    oldsp = sp;
                                    for (int i = 0; i < 5; ++i) {
                                        switch (i) {
                                        case 0: sp.setHorizontalPolicy(hp); break;
                                        case 1: sp.setVerticalPolicy(vp); break;
                                        case 2: sp.setHorizontalStretch(hst); break;
                                        case 3: sp.setVerticalStretch(vst); break;
                                        case 4: sp.setControlType(ct); break;
                                        case 5: sp.setHeightForWidth(hfw); sp.setWidthForHeight(wfh); break;
                                        default: break;
                                        }

                                        Qt::Orientations orients;
                                        if (sp.horizontalPolicy() & QSizePolicy::ExpandFlag)
                                            orients |= Qt::Horizontal;
                                        if (sp.verticalPolicy() & QSizePolicy::ExpandFlag)
                                            orients |= Qt::Vertical;

                                        makeRow(sp,
                                                i >= 0 ? hp  : oldsp.horizontalPolicy(),
                                                i >= 1 ? vp  : oldsp.verticalPolicy(),
                                                i >= 2 ? hst : oldsp.horizontalStretch(),
                                                i >= 3 ? vst : oldsp.verticalStretch(),
                                                i >= 4 ? ct  : oldsp.controlType(),
                                                i >= 5 ? hfw : oldsp.hasHeightForWidth(),
                                                i >= 5 ? wfh : oldsp.hasWidthForHeight(),
                                                orients);
#ifdef GENERATE_BASELINE
                                        stream << sp;
#endif
                                    }
                                }
                            }
                        }
                    }
                }
            }
#ifdef GENERATE_BASELINE
            out.close();
        }
#endif
#undef ITEMCOUNT
    }
}

void tst_QSizePolicy::dataStream()
{
    QByteArray data;
    QSizePolicy sp(QSizePolicy::Minimum, QSizePolicy::Expanding);
    {
        QDataStream stream(&data, QIODevice::ReadWrite);
        sp.setHorizontalStretch(42);
        sp.setVerticalStretch(10);
        sp.setControlType(QSizePolicy::CheckBox);
        sp.setHeightForWidth(true);

        stream << sp;   // big endian
/*
|                     BYTE 0                    |                    BYTE 1                     |
|  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  | 10  | 11  | 12  | 13  | 14  | 15  |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
|               Horizontal stretch              |               Vertical stretch                |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+

|                     BYTE 2                    |                    BYTE 3                     |
| 16  | 17  | 18  | 19  | 20  | 21  | 22  | 23  | 24  | 25  | 26  | 27  | 28  | 29  | 30  | 31  |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| pad | wfh |        Control Type         | hfw |    Vertical policy    |   Horizontal policy   |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
*/
        QCOMPARE((char)data[0], char(42));                  // h stretch
        QCOMPARE((char)data[1], char(10));                  // v stretch
        QCOMPARE((char)data[2], char(1 | (2 << 1)));    // (hfw + CheckBox)
        QCOMPARE((char)data[3], char(QSizePolicy::Minimum | (QSizePolicy::Expanding << 4)));
    }

    {
        QSizePolicy readSP;
        QDataStream stream(data);
        stream >> readSP;
        QCOMPARE(sp, readSP);
    }
}


void tst_QSizePolicy::horizontalStretch()
{
    QSizePolicy sp;
    sp.setHorizontalStretch(257);
    QCOMPARE(sp.horizontalStretch(), 255);
    sp.setHorizontalStretch(-2);
    QCOMPARE(sp.horizontalStretch(), 0);
}

void tst_QSizePolicy::verticalStretch()
{
    QSizePolicy sp;
    sp.setVerticalStretch(-2);
    QCOMPARE(sp.verticalStretch(), 0);
    sp.setVerticalStretch(257);
    QCOMPARE(sp.verticalStretch(), 255);
}

void tst_QSizePolicy::qhash()
{
    FETCH_TEST_DATA;
    Q_UNUSED(ed);

    QSizePolicy sp2(hp, vp, ct);
    sp2.setVerticalStretch(vst);
    sp2.setHorizontalStretch(hst);
    if (hfw) sp2.setHeightForWidth(true);
    if (wfh) sp2.setWidthForHeight(true);
    QCOMPARE(sp, sp2);
    QCOMPARE(qHash(sp), qHash(sp2));
}

#undef FETCH_TEST_DATA

QTEST_MAIN(tst_QSizePolicy)
#include "tst_qsizepolicy.moc"