#include <TM1637Display.h>

unsigned long COUNTDOWN_TIME = 0; 


#define CLK_PIN 2
#define DIO_PIN 3
#define ent 6
#define inc 5
#define dec 4



TM1637Display display(CLK_PIN, DIO_PIN);

unsigned long startTime;

void setup() {
  pinMode(ent, INPUT);
  pinMode(inc, INPUT);
  display.setBrightness(7); 
  set_time();
  
}

void loop() {
  timer();
  set_time();
} 

void set_time(){
  display.showNumberDecEx(0, 0b01000000, true); 
  while (digitalRead(ent)==LOW){
    if (digitalRead(inc)==HIGH){
      delay(100);
      COUNTDOWN_TIME+=1;
      unsigned int minutes = COUNTDOWN_TIME/ 60;
      unsigned int seconds = COUNTDOWN_TIME % 60;
      display.showNumberDecEx(minutes * 100 + seconds, 0b01000000, true);
    }
    if (digitalRead(dec)==HIGH){
      delay(100);
      COUNTDOWN_TIME-=1;
      unsigned int minutes = COUNTDOWN_TIME/ 60;
      unsigned int seconds = COUNTDOWN_TIME % 60;
      display.showNumberDecEx(minutes * 100 + seconds, 0b01000000, true);
    }
  }


}

void timer(){
  startTime = millis(); 
  unsigned long elapsedTime = (millis() - startTime) / 1000;
  unsigned long remainingTime = COUNTDOWN_TIME - elapsedTime;
  while (remainingTime != 0){
    elapsedTime = (millis() - startTime) / 1000; 

    if (elapsedTime <= COUNTDOWN_TIME) {
      remainingTime = COUNTDOWN_TIME - elapsedTime;

      unsigned int minutes = remainingTime / 60;
      unsigned int seconds = remainingTime % 60;
      display.showNumberDecEx(minutes * 100 + seconds, 0b01000000, true);
        
    }
  }
}