#include "SevSeg.h"

SevSeg sevseg;

int counter = 0;
unsigned long timer = 0;
bool start_stop = false;
bool start_stop_two = false;
int button_start = 9;
int button_two_start = 10;
int button_reset = 11;
int last_button_start = LOW;
int cur_button_start = LOW;
int last_button_two_start = LOW;
int cur_button_two_start = LOW;
int last_button_reset = LOW;
int cur_button_reset = LOW;
int plusminus = 13;
int adjust = 1;
int negative = 1;
unsigned long t1 = 0;

void setup() {
  byte numDigits = 1;
  byte digitPins[] = {};
  byte segmentPins[] = {2, 3, 4, 5, 6, 7, 8};
  bool resistorsOnSegments = true;
  pinMode(button_start, INPUT);
  digitalWrite(button_start, HIGH);
  pinMode(button_two_start, INPUT);
  digitalWrite(button_two_start, HIGH);

  byte hardwareConfig = COMMON_CATHODE; 
  sevseg.begin(hardwareConfig, numDigits, digitPins, segmentPins, resistorsOnSegments);
  sevseg.setBrightness(90);
  Serial.begin(9600);
  
}

int debounce(int last, int button_port) 
{
  
    int current = digitalRead(button_port);

    if (last != current) 
    {

        delay(10);

        current = digitalRead(button_port);
    }

    return current;
}

void loop() {
  cur_button_start = debounce(last_button_start, button_start);
  delay(10);
  cur_button_two_start = debounce(last_button_two_start, button_two_start);
  
  if (last_button_start == HIGH && cur_button_start == LOW && last_button_two_start == HIGH && cur_button_two_start == HIGH) 
  {
    
    if (start_stop) 
    {

      start_stop = false;
    }
    else 
    {

      start_stop = true;
      start_stop_two = false;
    }
  }

  if (last_button_start == HIGH && cur_button_start == HIGH && last_button_two_start == HIGH && cur_button_two_start == LOW) 
  {
    
    if (start_stop_two) 
    {

      start_stop_two = false;
    }
    else 
    {

      start_stop = false;
      start_stop_two = true;
      if(counter == 0) {
        counter = 10;
      }
    }
  }

  last_button_start = cur_button_start;
  last_button_two_start = cur_button_two_start;

  if (start_stop) 
  {
    
   if ( counter < 10)
   {
     
     if ( millis() - timer >= 1000)
     {
      timer = timer + 1000;
      counter = counter + 1;
      send_display();
     }

   }

    if ( counter == 10)
    {
      counter = 0;
      timer = millis();
      sevseg.setNumber(0, 0);
      adjust = 0;
      start_stop = !start_stop;
    }

  }
  else if (start_stop_two) 
  {
    
   if ( counter > 0)
   {
     
     if ( millis() - timer >= 1000)
     {
      timer = timer + 1000;
      counter = counter - 1;
      send_display();
     }

   }

    if ( counter == 0)
    {
      counter = 10;
      timer = millis();
      sevseg.setNumber(0, 0);
      adjust = 0;
      start_stop_two = !start_stop_two;
    }

  }
  else 
  {

    timer = millis();

    cur_button_reset = debounce(last_button_reset, button_reset);

    if (last_button_reset == HIGH && cur_button_reset == LOW) 
    {
      counter = 0;
      timer = millis();
      sevseg.setNumber(0, 0);
      adjust = 1;
      digitalWrite(plusminus, HIGH);

    }

    last_button_reset = cur_button_reset;
  }

  sevseg.refreshDisplay(); // Must run repeatedly
}


void send_display()
{
  if (counter < 10)
  {
    sevseg.setNumber(counter, 0);
  }
  sevseg.refreshDisplay();

}