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

RTC_DS1307 rtc;

// Pin Definitions
#define SEGMENT_A_PIN 2
#define SEGMENT_B_PIN 3
#define SEGMENT_C_PIN 4
#define SEGMENT_D_PIN 5
#define SEGMENT_E_PIN 6
#define SEGMENT_F_PIN 7
#define SEGMENT_G_PIN 8
#define SEGMENT_DP_PIN 13

// Define pins for hour and minute adjustment buttons
#define BUTTON_HOUR_PIN 9
#define BUTTON_MINUTE_PIN 10

// Digital Pins for digits
#define DIGIT_1_PIN A0
#define DIGIT_2_PIN A1
#define DIGIT_3_PIN A2
#define DIGIT_4_PIN A3

// Segment Pins
const int segmentPins[] = {SEGMENT_A_PIN, SEGMENT_B_PIN, SEGMENT_C_PIN, SEGMENT_D_PIN, SEGMENT_E_PIN, SEGMENT_F_PIN, SEGMENT_G_PIN};
const int digitPins[] = {DIGIT_1_PIN, DIGIT_2_PIN, DIGIT_3_PIN, DIGIT_4_PIN};

// Variables to store current time
int currentHour = 0;
int currentMinute = 0;
int currentSecond = 0;

// Function to update the display with the current time
void updateDisplay() {
  // Turn off all digits
  for (int i = 0; i < 4; i++) {
    digitalWrite(digitPins[i], LOW);
  }

  // Get individual digits of the hour and minute
  int hourDigit1 = currentHour / 10;
  int hourDigit2 = currentHour % 10;
  int minuteDigit1 = currentMinute / 10;
  int minuteDigit2 = currentMinute % 10;

  // Display the hour and minute on the digits
  digitalWrite(digitPins[0], HIGH);
  displayDigit(hourDigit1);
  delay(5);
  digitalWrite(digitPins[1], HIGH);
  displayDigit(hourDigit2);
  delay(5);
  digitalWrite(digitPins[2], HIGH);
  displayDigit(minuteDigit1);
  delay(5);
  digitalWrite(digitPins[3], HIGH);
  displayDigit(minuteDigit2);
  
  // Display the time on the serial monitor
  Serial.print("Time: ");
  if (currentHour < 10) {
    Serial.print("0");
  }
  Serial.print(currentHour);
  Serial.print(":");
  if (currentMinute < 10) {
    Serial.print("0");
  }
  Serial.println(currentMinute);
}

// Function to display a digit on the 7-segment display
void displayDigit(int digit) {
  // Define the segment patterns for each digit
  const byte digitPatterns[] = {
    B11111100,  // Digit 0
    B01100000,  // Digit 1
    B11011010,  // Digit 2
    B11110010,  // Digit 3
    B01100110,  // Digit 4
    B10110110,  // Digit 5
    B10111110,  // Digit 6
    B11100000,  // Digit 7
    B11111110,  // Digit 8
    B11110110   // Digit 9
  };

  // Display the digit by setting the appropriate segments
  for (int i = 0; i < 7; i++) {
    digitalWrite(segmentPins[i], bitRead(digitPatterns[digit], i));
  }
}

void setup() {
  // Initialize the RTC module
  Wire.begin();
  rtc.begin();

  // Set the initial time to 12:00:00
  rtc.adjust(DateTime(2024, 4, 6, 12, 0, 0));

  // Set the button pins as inputs with internal pull-ups
  pinMode(BUTTON_HOUR_PIN, INPUT_PULLUP);
  pinMode(BUTTON_MINUTE_PIN, INPUT_PULLUP);

  // Set the digit pins as outputs
  for (int i = 0; i < 4; i++) {
    pinMode(digitPins[i], OUTPUT);
  }

  // Set the segment pins as outputs
  for (int i = 0; i < 7; i++) {
    pinMode(segmentPins[i], OUTPUT);
  }

  // Start the serial monitor
  Serial.begin(9600);
}

void loop() {
  // Read the current time from the RTC module
  DateTime now = rtc.now();
  currentHour = now.hour();
  currentMinute = now.minute();
  currentSecond = now.second();

  // Update the display
  updateDisplay();
}