/*
 * peripherals_button.hpp
 *
 *  Created on: Apr 17, 2021
 *      Author: erki
 */

#ifndef PERIPHERALS_BUTTON_HPP_
#define PERIPHERALS_BUTTON_HPP_

#include <cstdint>

namespace Peripherals
{

enum class ButtonPress : std::uint32_t
{
  NOT_PRESSED,
  SHORT_PRESS,
  LONG_PRESS
};

template<typename G, typename H>
class Button
{
public:
  using gpio = G;
  using hal = H;

  static constexpr std::uint32_t TIMEOUT_SHORT_PRESS = 50;
  static constexpr std::uint32_t TIMEOUT_LONG_PRESS = 500;

  Button() = delete;
  explicit Button(const gpio& sw)
      : _sw(sw)
  {}

  void update()
  {
    const bool is_pressed = _sw.Read();
    ButtonPress new_state = ButtonPress::NOT_PRESSED;

    if (is_pressed && !_was_pressed)
    {
      _time_pressed_down = hal::GetMillis();
    } else if (!is_pressed && _was_pressed)
    {
      const std::uint32_t time_held = hal::GetMillis() - _time_pressed_down;
      if (time_held > TIMEOUT_LONG_PRESS)
        new_state = ButtonPress::LONG_PRESS;
      else if (time_held > TIMEOUT_SHORT_PRESS)
        new_state = ButtonPress::SHORT_PRESS;

      _time_pressed_down = 0;
    }

    _was_pressed = is_pressed;
    _current_state = new_state;
  }

  [[nodiscard]] ButtonPress getState() const
  {
    return _current_state;
  }

private:
  gpio _sw;

  bool _was_pressed = false;
  std::uint32_t _time_pressed_down = 0;
  ButtonPress _current_state = ButtonPress::NOT_PRESSED;
};

}// namespace Peripherals

#endif /* PERIPHERALS_BUTTON_HPP_ */