#pragma once

#include <QtGlobal>
#include <limits>

// iOS shift semantics:
//  - tap: shift the next character only
//  - double-tap: caps lock; tap again to unlock
//  - hold while typing: every character shifted, off on release
// Times are in milliseconds and passed in, so this stays deterministic.
class ShiftState
{
public:
    enum class Mode { Off, Once, Locked };

    static constexpr qint64 DoubleTapMs = 300;

    Mode mode() const { return m_mode; }
    bool isUppercase() const { return m_mode != Mode::Off; }

    void press(qint64 timeMs);
    void release();
    void characterTyped();

    // Auto-capitalization hint; ignored while shift is held or locked.
    void setAutomatic(bool capitalize);

private:
    Mode m_mode = Mode::Off;
    bool m_held = false;
    bool m_typedWhileHeld = false;
    qint64 m_lastPress = std::numeric_limits<qint64>::min() / 2;
};