#pragma once

#include <cstdint>
#include <vector>

#include "key_event.h"

namespace roro {

// The physical keyboard state as reported by the keyboard driver: every character key currently
// held (already shifted) plus the modifier and special keys.
struct RawKeys {
    std::vector<char> chars;
    bool fn = false;
    bool opt = false;
    bool ctrl = false;
    bool alt = false;
    bool shift = false;
    bool enter = false;
    bool del = false;
    bool tab = false;
};

// Turns keyboard state changes into logical KeyEvents: only newly pressed keys produce events;
// Fn + ; . , / are arrows; ` is Back and Fn + ` is Home; the Compose Key (opt) followed by an
// accent and a letter types the accented letter (opt ' e -> é).
class KeyMapper {
   public:
    std::vector<KeyEvent> update(const RawKeys& keys);

    // 0 when idle, '*' when opt was pressed, or the accent character waiting for its letter.
    char pendingCompose() const { return compose_; }

   private:
    void onChar(char c, const RawKeys& keys, std::vector<KeyEvent>& out);

    RawKeys previous_;
    char compose_ = 0;
};

}  // namespace roro