#define ANIMATED

#include <MD_MAX72xx.h>   // https://github.com/MajicDesigns/MD_MAX72XX
#include <MD_Parola.h>    // https://github.com/MajicDesigns/MD_Parola
#include <HX711.h>
#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 float ScaleCorrFactor {1 / 2.381};   // Unit in Grams
}   // namespace gc

// Display
MD_Parola Mx = MD_Parola(MD_MAX72XX::PAROLA_HW, gc::CsPin, gc::MaxLedDevices);
HX711 Scale;

void getWeightStr(WeightStr_t WeightStr, long WeightTotal) {
  WeightTotal = (WeightTotal + 5) / 10;
  uint8_t WeightKg = WeightTotal / 100;
  uint16_t WeigtGrams = WeightTotal % 100;
  snprintf(WeightStr, sizeof(WeightStr_t), "%1d,%02d kg", WeightKg, WeigtGrams);
}

void showWeightStr(WeightStr_t WeightStr, textEffect_t Effect = PA_NO_EFFECT) {
  Mx.displayClear();
  Mx.displayText(WeightStr, PA_CENTER, 30, 0, Effect);
  while (!Mx.displayAnimate()) { ; }
}

void setup() {
  Serial.begin(115200);
  Scale.begin(A1, A0);
  Scale.set_scale(gc::ScaleCorrFactor);
  Mx.begin();
  Mx.setIntensity(15);
}

void loop() {
  static WeightStr_t Buffer;
  static long OldWeight {0};

#ifdef ANIMATED
  static textEffect_t Animation[2] {PA_SCROLL_DOWN, PA_SCROLL_UP};
  static uint8_t AIdx {0};
#endif
  long WeightTotalInGrams = Scale.get_units(5);
  if (OldWeight != WeightTotalInGrams) {
    OldWeight = WeightTotalInGrams;
    getWeightStr(Buffer, WeightTotalInGrams);
#ifdef ANIMATED
    showWeightStr(Buffer, Animation[AIdx ^= 1]);
#else
    showWeightStr(Buffer);
#endif
  }
}