// overall layout:
// queue for each led stripe
//

enum class EffectID
{
  OFF,
  STATIC,
  CIRCLE,
  CIRCLE_WAVE,
  COLOR_FADE,
  RAINBOW_FADE,
};

struct EffectCircularConfig
{
  float speed; // in degrees per second
  float width; // width in degrees
  float brightnessFalloffFactor;
};

template <typename TLedStrip>
class AbstractEffect
{
public:
  virtual int operator()(TLedStrip &s) = 0;
};

template <typename TLedStrip>
class EffectCircle : public AbstractEffect<TLedStrip>
{
public:
  EffectCircle(const EffectCircularConfig &cfg) : config_(cfg) {}
  int operator()(TLedStrip &s) override;

private:
  EffectCircularConfig config_;
  float currentPosition_; // between 0 and 1
};

unsigned char effectStorage[128];

template <typename TLedStrip>
AbstractEffect<TLedStrip> *makeEffect(const char *buffer)
{
  const EffectID &effectId = *reinterpret_cast<const EffectID *>(buffer);
  if (effectId == EffectID::CIRCLE)
  {
    auto cfg = reinterpret_cast<const EffectCircularConfig *>(buffer + sizeof(EffectID));
    return new (effectStorage) EffectCircle<TLedStrip>(*cfg);
  }
  // read effect id code from buffer
  // read config from buffer
}