#include <TM1637.h>

TM1637 tm(0, 1);
int active = 0;
int8_t TimeDisp[] = {0,0,0,0};

void setup() 
{
  tm.init();
  tm.set(BRIGHT_TYPICAL);
  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  pinMode(4, INPUT_PULLUP);
}

void loop() 
{
  if(active == 0)
  {
    if(digitalRead(3) == LOW)
    {
      if(TimeDisp[2] == 5){if(TimeDisp[3] == 9){TimeDisp[2] = 0;TimeDisp[3] = 0;}else{TimeDisp[3]++;}}
      else{if(TimeDisp[3] == 9){TimeDisp[2]++;TimeDisp[3] = 0;}else{TimeDisp[3]++;}}
      tone(5, 600, 40);
      delay(200);
    }
    if(digitalRead(2) == LOW)
    {
      if(TimeDisp[0] == 5){if(TimeDisp[1] == 9){TimeDisp[0] = 0;TimeDisp[1] = 0;}else{TimeDisp[1]++;}}
      else{if(TimeDisp[1] == 9){TimeDisp[0]++;TimeDisp[1] = 0;}else{TimeDisp[1]++;}}
      tone(5, 600, 40);
      delay(200);
    }
    if(digitalRead(4) == LOW){active=1;tone(5, 600, 300);}
  }
  else
  {
    delay(1000);
    if(TimeDisp[0] == 0 && TimeDisp[1] == 0 && TimeDisp[2] == 0 && TimeDisp[3] == 0)
    {active = 0;tone(5, 3200, 30);delay(120);tone(5, 3200, 30);delay(120);tone(5, 3200, 30);delay(120);tone(5, 3200, 30);
    OnTimeout();}
    else if(TimeDisp[1] == 0 && TimeDisp[2] == 0 && TimeDisp[3] == 0)
    {TimeDisp[0]--;TimeDisp[1] = 9;TimeDisp[2] = 5;TimeDisp[3] = 9;tone(5, 3000, 50);}
    else if(TimeDisp[2] == 0 && TimeDisp[3] == 0)
    {TimeDisp[1]--;TimeDisp[2] = 5;TimeDisp[3] = 9;tone(5, 3000, 50);}
    else if(TimeDisp[3] == 0)
    {TimeDisp[2]--;TimeDisp[3] = 9;tone(5, 3000, 50);}
    else{TimeDisp[3]--;tone(5, 3000, 50);}
  }
  tm.display(TimeDisp);
}

void OnTimeout()
{
  // Event on timeout;
}