#include "ssd.h"
const unsigned char digits[] = {BLANK,BLANK,BLANK, ONE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT, NINE,BLANK,BLANK,BLANK};
//const unsigned char digits[] = {BLANK,BLANK,H,I,A,D,I,L,BLANK,BLANK};
#define btn  2
static unsigned char ssd[MAX_SSD_CNT];
volatile int state = HIGH;

int size = sizeof(digits)/sizeof(digits[0]);

void setup() {
  init_ssd();
  pinMode(2,INPUT);
  pinMode(12,OUTPUT);
  attachInterrupt(digitalPinToInterrupt(btn),toggle,CHANGE);

}

void toggle(){
  state = !state;

}

void reverse(){
   static int wait = 0;
   static int i = 0 ;
      
      ssd[0] = digits[i];
      ssd[1] = digits[i+1];
      ssd[2] = digits[i+2];
      ssd[3] = digits[i+3];
      display(ssd);

  if (!wait--) {
     i++;
    if (i == size-2 ){

      i = 0;
    } 
  
    wait = 5000;
     
  }
  
}

void loop() {
  
  // reading button using and controlling direction via level triggering
  if(state){

    reverse();
    
  
  }
  else{
     forward();
     
  }

  
}

void forward(){
   static int wait = 0;
   static int i = size-1 ;
      
      ssd[0] = digits[i-3];
      ssd[1] = digits[i-2];
      ssd[2] = digits[i-1];
      ssd[3] = digits[i];
      display(ssd);
      

  if (!wait--) {
     i--;
    if (i == 0 ){
      
      i = size -1;
    } 
    wait = 5000;
     
  }

}