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

const int rs = 8, en = 9, d4 = 10, d5 = 11, d6 = 12, d7 = 13;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

RTC_DS1307 RTC;

const int buzzer = 3, next = 7, INC = 6, set_mad = 5;
int HOUR, MINUT, SECOND;
int hours1, minut, add = 11;

void setup() {
  Wire.begin();
  RTC.begin();
  lcd.begin(16, 2);

  pinMode(INC, INPUT);
  pinMode(next, INPUT);
  pinMode(set_mad, INPUT);
  pinMode(buzzer, OUTPUT);

  digitalWrite(next, HIGH);  // Enable pull-up resistor
  digitalWrite(set_mad, HIGH);
  digitalWrite(INC, HIGH);

  lcd.setCursor(0, 0);
  lcd.print("Real Time Clock");
  lcd.setCursor(0, 1);
  lcd.print("Circuit Digest");
  delay(2000);

  if (!RTC.isrunning()) {
    RTC.adjust(DateTime(__DATE__, __TIME__));
  }
}

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

  if (digitalRead(set_mad) == 0) {
    lcd.setCursor(0, 0);
    lcd.print("  Set Alarm  ");
    delay(2000);
    defualt();
    time();
    delay(1000);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("  Alarm time ");
    lcd.setCursor(0, 1);
    lcd.print(" has been set  ");
    delay(2000);
  }

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Time:");
  lcd.setCursor(6, 0);
  lcd.print(now.hour(), DEC);
  lcd.print(":");
  lcd.print(now.minute(), DEC);
  lcd.print(":");
  lcd.print(now.second(), DEC);

  lcd.setCursor(0, 1);
  lcd.print("Date: ");
  lcd.print(now.day(), DEC);
  lcd.print("/");
  lcd.print(now.month(), DEC);
  lcd.print("/");
  lcd.print(now.year(), DEC);

  match();
  delay(200);
}

void defualt() {
  lcd.setCursor(0, 1);
  lcd.print(HOUR);
  lcd.print(":");
  lcd.print(MINUT);
  lcd.print(":");
  lcd.print(SECOND);
}

void time() {
  int temp = 1;

  while (temp == 1) {
    if (digitalRead(INC) == 0) {
      HOUR++;
      if (HOUR == 24) {
        HOUR = 0;
      }
      while (digitalRead(INC) == 0);
    }
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Set Alarm Time ");
    lcd.setCursor(0, 1);
    lcd.print(HOUR);
    lcd.print(":");
    lcd.print(MINUT);
    lcd.print(":");
    lcd.print(SECOND);
    delay(100);

    if (digitalRead(next) == 0) {
      hours1 = HOUR;
      EEPROM.write(add++, hours1);
      temp = 2;
      while (digitalRead(next) == 0);
    }
  }

  while (temp == 2) {
    if (digitalRead(INC) == 0) {
      MINUT++;
      if (MINUT == 60) {
        MINUT = 0;
      }
      while (digitalRead(INC) == 0);
    }
    lcd.setCursor(0, 1);
    lcd.print(HOUR);
    lcd.print(":");
    lcd.print(MINUT);
    lcd.print(":");
    lcd.print(SECOND);
    delay(100);

    if (digitalRead(next) == 0) {
      minut = MINUT;
      EEPROM.write(add++, minut);
      temp = 0;
      while (digitalRead(next) == 0);
    }
  }
  delay(1000);
}

void match() {
  int tem[17];
  for (int i = 11; i < 17; i++) {
    tem[i] = EEPROM.read(i);
  }
  if (HOUR == tem[11] && MINUT == tem[12]) {
    beep();
    beep();
    beep();
    beep();
    lcd.clear();
    lcd.print("Wake Up........");
    lcd.setCursor(0, 1);
    lcd.print("Wake Up.......");
    beep();
    beep();
    beep();
    beep();
  }
}

void beep() {
  digitalWrite(buzzer, HIGH);
  delay(500);
  digitalWrite(buzzer, LOW);
  delay(500);
}