#define rotpot1 A0
#define rotpot2 A1

#define duty_s 1
#define chaser_len 15


int prefix_pin = 15;
int prefix_time = 100;

int duty_cycle = 70;
int select = 0;


typedef struct Switch {
  const int pin;  
  int duty_cycle;
  unsigned long set_at;
  bool state;

  Switch(int pin) : pin(pin), duty_cycle(duty_cycle) {
    pinMode(pin, OUTPUT);
  };

  void 
  flip(unsigned long timestamp) {
    unsigned long td = timestamp - this->set_at;

    if (  (this->state 
            && 
          td > (duty_s * 10 * this->duty_cycle))
        ||
          (!this->state 
            && 
          td > (duty_s * 10 * (100 - this->duty_cycle))) 
      ) {
      this->state = !this->state;
      this->set_at = timestamp;

      if (this->state) {
        digitalWrite(prefix_pin, HIGH);
        delay(50);
        digitalWrite(prefix_pin, LOW);
      }
      
      digitalWrite(this->pin, this->state);
    }

  }


} Switch;

Switch chaser[chaser_len] = {16, 17, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14};



void 
setup() {

  Serial.begin(9600);

  pinMode(rotpot1, INPUT);
  pinMode(rotpot2, INPUT);

  pinMode(prefix_pin, OUTPUT);
}

void
updateValues(int* pduty_cycle, int* pselect) {
  int select = map(analogRead(rotpot1), 0, 1023, 0, chaser_len+1);
  int duty_cycle = map(analogRead(rotpot2), 0, 1023, 1, 100); 

  if (*pselect != select) {
    Serial.print("selected ");
    if (select == chaser_len) {
      Serial.println("all switches");
    } else {
      Serial.print("switch #");
      Serial.println(select);
    }
    
    *pselect = select;
  }

  if (*pduty_cycle != duty_cycle) {
    *pduty_cycle = duty_cycle;
  }
  
  
}

void 
loop() {
  updateValues(&duty_cycle, &select);
  if (select == chaser_len+1) 
    prefix_time = duty_cycle * 10 * duty_s; // ???

  for (int offset = 0; offset < chaser_len; offset++) {
    if (offset == select || select == chaser_len) 
      chaser[offset].duty_cycle = duty_cycle;
    chaser[offset].flip(millis());
  }

}