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#ifndef QCOCOAKEYMAPPER_H
#define QCOCOAKEYMAPPER_H

#include <Carbon/Carbon.h>

#include <QtCore/QList>
#include <QtGui/QKeyEvent>

#include <QtCore/private/qcore_mac_p.h>

QT_BEGIN_NAMESPACE

class QCocoaKeyMapper
{
public:
    static Qt::KeyboardModifiers queryKeyboardModifiers();
    QList<int> possibleKeys(const QKeyEvent *event) const;

    static Qt::KeyboardModifiers fromCocoaModifiers(NSEventModifierFlags cocoaModifiers);
    static NSEventModifierFlags toCocoaModifiers(Qt::KeyboardModifiers);

    static QChar toCocoaKey(Qt::Key key);
    static Qt::Key fromCocoaKey(QChar keyCode);

private:
    static constexpr int kNumModifierCombinations = 16;
    struct KeyMap : std::array<char32_t, kNumModifierCombinations>
    {
        // Initialize first element to a sentinel that allows us
        // to distinguish an uninitialized map from an initialized.
        // Using 0 would not allow us to map U+0000 (NUL), however
        // unlikely that is.
        KeyMap() : std::array<char32_t, 16>{Qt::Key_unknown} {}
    };

    bool updateKeyboard();

    using VirtualKeyCode = unsigned short;
    const KeyMap &keyMapForKey(VirtualKeyCode virtualKey, QChar unicodeKey) const;

    QCFType<TISInputSourceRef> m_currentInputSource = nullptr;

    enum { NullMode, UnicodeMode, OtherMode } m_keyboardMode = NullMode;
    const UCKeyboardLayout *m_keyboardLayoutFormat = nullptr;
    KeyboardLayoutKind m_keyboardKind = kKLKCHRuchrKind;
    mutable UInt32 m_deadKeyState = 0; // Maintains dead key state beween calls to UCKeyTranslate

    mutable QHash<VirtualKeyCode, KeyMap> m_keyMap;
};

QT_END_NAMESPACE

#endif