#include <Wire.h>
#include <RTClib.h>
#include <SevSeg.h>
#define digit1 2
#define digit2 3
#define digit3 4
#define digit4 5
#define A 6
#define B 7
#define C 8
#define D 9
#define E 10
#define F 11
#define G 12
#define DP 13
#define incHourButtonPin 0
#define incMinuteButtonPin 1
#define decHourButtonPin 14
#define decMinuteButtonPin 15
RTC_DS1307 rtc;
SevSeg sevseg;
int hours = 0;
int minutes = 0;

void setup() {
  // put your setup code here, to run once:
  Wire.begin();
  rtc.begin();
  byte numDigits = 4;
  byte digitPins[] = {digit1, digit2, digit3, digit4};
  byte segmentPins[] = {A, B, C, D, E, F, G, DP};
  bool resistorsOnSegments = false;
  bool updateWithDelaysIn = true;
  byte hardwareConfig = COMMON_ANODE;
  sevseg.begin(hardwareConfig,
               numDigits,
               digitPins, segmentPins, resistorsOnSegments);
  pinMode(incHourButtonPin, INPUT);
  pinMode(incMinuteButtonPin, INPUT);
  pinMode(decHourButtonPin, INPUT);
  pinMode(decMinuteButtonPin, INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  DateTime now = rtc.now();
  hours = now.hour();
  minutes = now.minute();

  sevseg.setNumber(hours * 100 + minutes);
  sevseg.refreshDisplay();

  if (digitalRead(incHourButtonPin) == HIGH) {
    while (digitalRead(incHourButtonPin) == HIGH) {
      delay(300);
      hours++;
      if (hours > 23)
      {
        hours = 0;
        minutes = 0;
      }
    }
    rtc.adjust(DateTime(now.year(), now.month(),
                        now.day(), hours, minutes, 0));
  }

  if (digitalRead(incMinuteButtonPin) == HIGH) {
    while (digitalRead(incMinuteButtonPin) == HIGH) {
      delay(300);
      minutes++;

      if (minutes > 59) {
        minutes = 0;
        hours++;
        if (hours > 23) hours = 0;
      }

    }
    rtc.adjust(DateTime(now.year(), now.month(),
                        now.day(), hours, minutes, 0));
  }
  if (digitalRead(decHourButtonPin) == HIGH) {
    while (digitalRead(decHourButtonPin) == HIGH) {
      delay(300);
      hours--;
      if (hours < 0 && minutes > 0) hours = 0;
    }
    rtc.adjust(DateTime(now.year(), now.month(),
                        now.day(), hours, minutes, 0));
  }


  if (digitalRead(decMinuteButtonPin) == HIGH) {
    while (digitalRead(decMinuteButtonPin) == HIGH) {
      delay(300);
      minutes--;
      if (minutes < 0)
      {
        minutes = 59;
        hours--;
      }
    }
    rtc.adjust(DateTime(now.year(), now.month(),
                        now.day(), hours, minutes, 0));
  }

  delay(10);
}