#include <Wire.h>
#include <RTClib.h>

RTC_DS1307 rtc;

// Shift register pin tanımlamaları
const int dataPin = 7;   // DS
const int latchPin = 9;  // ST_CP
const int clockPin = 8;  // SH_CP

// CD74HC4067 pin tanımlamaları
const int S0 = 2;
const int S1 = 3;
const int S2 = 4;
const int S3 = 5;
const int Z = 6;

// Buton pin tanımlamaları
const int hourButtonPin = 10;
const int minuteButtonPin = 11;

// 7 segment rakam kodları
const byte numToSegment[] = {
  B00111111, // 0
  B00000110, // 1
  B01011011, // 2
  B01001111, // 3
  B01100110, // 4
  B01101101, // 5
  B01111101, // 6
  B00000111, // 7
  B01111111, // 8
  B01101111  // 9
};

unsigned long lastUpdate = 0;

void setup() {
  Serial.begin(9600);
  Wire.begin();
  rtc.begin();

  if (!rtc.isrunning()) {
    Serial.println("RTC pilini takın!");
    rtc.adjust(DateTime(2024, 10, 9, 12, 0, 0));
  }

  pinMode(dataPin, OUTPUT);
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(Z, OUTPUT);
  pinMode(hourButtonPin, INPUT_PULLUP);
  pinMode(minuteButtonPin, INPUT_PULLUP);
  pinMode(S0, OUTPUT);
  pinMode(S1, OUTPUT);
  pinMode(S2, OUTPUT);
  pinMode(S3, OUTPUT);
}

void loop() {
  DateTime now = rtc.now();

  // Saat butonu
  if (digitalRead(hourButtonPin) == LOW) {
    int newHour = (now.hour() + 1) % 24;
    rtc.adjust(DateTime(now.year(), now.month(), now.day(), newHour, now.minute(), now.second()));
    updateDisplays();
    delay(250);
    return;
  }

  // Dakika butonu
  if (digitalRead(minuteButtonPin) == LOW) {
    int newMinute = (now.minute() + 1) % 60;
    rtc.adjust(DateTime(now.year(), now.month(), now.day(), now.hour(), newMinute, 0));
    updateDisplays();
    delay(250);
    return;
  }

  // Normal calisma: saniyede bir guncelle
  if (millis() - lastUpdate >= 1000) {
    lastUpdate = millis();
    updateDisplays();
  }
}

void updateDisplays() {
  DateTime now = rtc.now();
  int tens = now.minute() / 10;
  int ones = now.minute() % 10;
  shiftOutDisplay(ones, tens);
  updateHourLED(now.hour());
}

void shiftOutDisplay(int ones, int tens) {
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, MSBFIRST, numToSegment[ones]);
  shiftOut(dataPin, clockPin, MSBFIRST, numToSegment[tens]);
  digitalWrite(latchPin, HIGH);
}

void shiftOut(int dataPin, int clockPin, int bitOrder, byte val) {
  for (int i = 0; i < 8; i++) {
    if (bitOrder == MSBFIRST) {
      digitalWrite(dataPin, !!(val & (1 << (7 - i))));
    } else {
      digitalWrite(dataPin, !!(val & (1 << i)));
    }
    digitalWrite(clockPin, HIGH);
    digitalWrite(clockPin, LOW);
  }
}

void updateHourLED(int hour) {
  hour = hour % 12;
  if (hour == 0) {
    hour = 12;
  }
  selectChannel(hour);
}

void selectChannel(int channel) {
  digitalWrite(Z, LOW);
  digitalWrite(S0, channel & 0x01);
  digitalWrite(S1, (channel >> 1) & 0x01);
  digitalWrite(S2, (channel >> 2) & 0x01);
  digitalWrite(S3, (channel >> 3) & 0x01);
  digitalWrite(Z, HIGH);
}