#define ANIMATED

#include <MD_MAX72xx.h>   // https://github.com/MajicDesigns/MD_MAX72XX
#include <MD_Parola.h>    // https://github.com/MajicDesigns/MD_Parola
#include <SPI.h>

using Millis_t = decltype(millis());
using WeightStr_t = char[sizeof("0,000 kg")];

namespace gc {
constexpr uint8_t ClkPin {13};
constexpr uint8_t DataPin {11};
constexpr uint8_t CsPin {10};
constexpr uint8_t MaxLedDevices {5};

constexpr uint32_t DisplayDelay_ms {3000};
}   // namespace gc

class Timer {
public:
  Timer() : TimeStamp(0), Reached(true) {}

  void start() {
    TimeStamp = millis();
    Reached = false;
  }
  void reset() { Reached = true; }

  bool operator()(const Millis_t Duration) {
    if (!Reached) { Reached = millis() - TimeStamp >= Duration; }
    return Reached;
  }

private:
  Millis_t TimeStamp;
  bool Reached;
};

// Display
MD_Parola Mx = MD_Parola(MD_MAX72XX::PAROLA_HW, gc::CsPin, gc::MaxLedDevices);
Timer Delay;

void getWeightStr(WeightStr_t WeightStr) {
  long WeightTotalInGrams = random(0, 10000);
  uint8_t WeightKg = WeightTotalInGrams / 1000;
  uint16_t WeigtGrams = WeightTotalInGrams % 1000;
  snprintf(WeightStr, sizeof(WeightStr_t), "%1d,%03d kg", WeightKg, WeigtGrams);
}

void showWeightStr(WeightStr_t WeightStr, textEffect_t Effect = PA_NO_EFFECT) {
  Mx.displayClear();
  Mx.displayText(WeightStr, PA_CENTER, 50, 0, Effect);
  while (!Mx.displayAnimate()) { ; }
}

void setup() {
  // Serial.begin(115200);
  Mx.begin();
  Mx.setIntensity(15);
  randomSeed(A0);
}

void loop() {
  static WeightStr_t Buffer;
#ifdef ANIMATED
  static textEffect_t Animation[2] {PA_SCROLL_DOWN, PA_SCROLL_UP};
  static uint8_t AIdx {0};
#endif

  if (Delay(gc::DisplayDelay_ms)) {
    Delay.start();
    getWeightStr(Buffer);
#ifdef ANIMATED
    showWeightStr(Buffer, Animation[AIdx ^= 1]);
#else
    showWeightStr(Buffer);
#endif
  }
}