class OneShotTimer {
  public:
    OneShotTimer(uint8_t pin, const char* lbl): 
        m_pin(pin), m_label(lbl) 
    {
      pinMode(m_pin, OUTPUT);
    }

    void start(float a, float b, float ml) {
      digitalWrite(m_pin, HIGH);
      m_startTime = millis();
      m_setTime = calcDelay(a, b, ml);
      Serial.print("Start: ");
      Serial.print(m_label);
      Serial.print(", duration: ");
      Serial.print(m_setTime);
      Serial.println(" ms.");
      m_running = 1;
    }

    void run() {
      if (millis() - m_startTime >= m_setTime && m_running) {
        digitalWrite(m_pin, LOW);
        Serial.print("Stop: ");
        Serial.println(m_label);
        m_running = 0;
      }
    }

    uint32_t calcDelay(float a, float b, int ml) {
      double val = a * (ml^2) + b * ml;
      return (uint32_t) val;
    }

  private:
    const char* m_label;
    uint8_t m_pin;
    uint8_t m_running;
    uint32_t m_startTime;
    uint32_t m_setTime;
};

#define pompa_a 7
#define pompa_b 8
#define pompa_c 9
#define pompa_d 10

OneShotTimer pumpA(pompa_a, "PUMP A");
OneShotTimer pumpB(pompa_b, "PUMP B");
OneShotTimer pumpC(pompa_c, "PUMP C");
OneShotTimer pumpD(pompa_d, "PUMP D");



void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

  pumpA.start(-0.0568, 66.154, 80);
  pumpB.start(-0.0268, 53.651, 80);
  pumpC.start(-0.0223, 49.775, 80);
  pumpD.start(-0.0505, 64.876, 80);
}

void loop() {
  pumpA.run();
  pumpB.run();
  pumpC.run();
  pumpD.run();
}

// void pompaNuang (int pump, int ml){
//   int pompa;
//   double y;
//   switch (pump) {
//     case pompa_a:
//       pompa = pompa_a;
//       y = -0.0568 * (ml^2) + 66.154 * ml;
//       break;
//     case pompa_b:
//       pompa = pompa_b;
//       y = -0.0268 * (ml^2) + 53.651 * ml;
//       break;
//     case pompa_c:
//       pompa = pompa_c;
//       y = -0.0223 * (ml^2) + 49.775 * ml;
//       break;
//     case pompa_d:
//       pompa = pompa_d;
//       y = -0.0505 * (ml^2) + 64.876 *ml;
//       break;
//     default:
//       Serial.println("wrong pin");
//   }
//   Serial.print("start pump:");
//   Serial.print(pompa);
//   Serial.print(", duration:");
//   Serial.println (int(y));
//   digitalWrite(pompa, HIGH);
//   delay(int(y));
//   digitalWrite(pompa,LOW);
// }