#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include "RTClib.h"

RTC_DS1307 rtc;
LiquidCrystal_I2C lcd(0x27,16,2);

char daysOfTheWeek[7][12] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
int amin = 0 ;
int ahour = 0;
int mode = 6;
int increase = 7;
int decrease = 8;
int confirm = 9;
int menu = 0;
int astatus = 0;
int change = 0;

void setup () 
{
  pinMode(mode,INPUT_PULLUP);
  pinMode(increase, INPUT_PULLUP);
  pinMode(decrease, INPUT_PULLUP);
  pinMode(confirm, INPUT_PULLUP);
  Serial.begin(9600);
  lcd.init();   
  lcd.backlight();
  if (! rtc.begin()) 
  {
    lcd.print("Couldn't find RTC");
    while (1);
  }

  if (! rtc.isrunning()) 
  {
    lcd.print("RTC is NOT running!");
  }
  
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));//auto update from computer time
}

void loop () 
{
    
    if(digitalRead(mode) == LOW){
      menu = (menu + 1) % 3; // Reset to 0 when it reaches 2
      delay(200); // Debouncing delay
    }
    if(menu == 0 ){
      displayTime();
    }
    else if(menu == 1){
      showAll();
    }
    else if(menu == 2){
      setAlarm();
    }
   
}
void showAll(){
  lcd.clear();
  while (digitalRead(mode)==HIGH){
    displayNow();
    alarmShow();
  }
}
void setAlarm() {
  lcd.clear();
DateTime now = rtc.now();
  while(digitalRead(mode)==HIGH){

    lcd.setCursor(0, 0);
    lcd.print("Set alarm time:");
    lcd.setCursor(5, 1);
    lcd.print((ahour < 10) ? "0" : "");
    lcd.print(ahour, DEC);
    lcd.print(":");
    lcd.print((amin < 10) ? "0" : "");
    lcd.print(amin, DEC);

    if (digitalRead(confirm) == LOW) {
      change = (change + 1) % 2;
      delay(200);
    }
    if (change == 0) {
      setAlarmMinute();
    }
    if(change==1){
      setAlarmHour();
    }
     if(astatus==1){
      if(now.minute()==amin&&now.hour()==ahour){
        lcd.clear();
        lcd.print("Alarm!!!!!");
        delay(60000);
      }
    }
  }
}

void setAlarmHour(){
  while(digitalRead(confirm)==HIGH&&digitalRead(mode)==HIGH){
    if(digitalRead(increase) == LOW){
      if(ahour >= 23){
        ahour = 0;
      } else {
        ahour++;
      }
      lcd.setCursor(5,1);
      if(ahour < 10){
        lcd.print("0");
      }
      lcd.print(ahour, DEC);
      delay(200); // Debouncing delay
    }
    if(digitalRead(decrease) == LOW){
      if(ahour <= 0){
        ahour = 23;
      } else {
        ahour--;
      }
      lcd.setCursor(5,1);
      if(ahour < 10){
        lcd.print("0");
      }
      lcd.print(ahour, DEC);
      delay(200); // Debouncing delay
    }
  }
}
void setAlarmMinute(){
  while(digitalRead(confirm)==HIGH&&digitalRead(mode)==HIGH){
    if(digitalRead(increase)==LOW){
      if(amin >= 59){
        amin = 0;
      } else {
        amin++;
      }
      lcd.setCursor(8,1);
      if(amin < 10){
        lcd.print("0");
      }
      lcd.print(amin, DEC);
      delay(200); // Debouncing delay
    }
    if(digitalRead(decrease)==LOW){
      if(amin <= 0){
        amin = 59;
      } else {
        amin--;
      }
      lcd.setCursor(8,1);
      if(amin < 10){
        lcd.print("0");
      }
      lcd.print(amin, DEC);
      delay(200); // Debouncing delay
    }
  }
}
void alarmShow(){
  lcd.setCursor(0,1);
  lcd.print("Alarm:");
  lcd.setCursor(7,1);
  if(ahour<10){
    lcd.print("0");
    lcd.print(ahour,DEC);
  }else{
    lcd.print(ahour,DEC);
  }
  lcd.print(":");
  if(amin<10){
    lcd.print("0");
    lcd.print(amin,DEC);
  }else{
    lcd.print(amin,DEC);
  }
  lcd.setCursor(13,1);
  if(digitalRead(confirm)==LOW){
    astatus=(astatus+1)%2;
    delay(200);
    lcd.clear();
  }
  if(astatus==0){
    lcd.print("OFF");
  }
  if(astatus==1){
    lcd.print("ON");
  }
}
void displayNow(){
  DateTime now = rtc.now();
    lcd.setCursor(0,0);
    lcd.print("Now:");
    lcd.setCursor(4, 0);
    if(now.hour()<=9)
    {
      lcd.print("0");
      lcd.print(now.hour());
    }
    else {
     lcd.print(now.hour()); 
    }
    lcd.print(':');
    if(now.minute()<=9)
    {
      lcd.print("0");
      lcd.print(now.minute());
    }
    else {
     lcd.print(now.minute()); 
    }
    lcd.print(':');
    if(now.second()<=9)
    {
      lcd.print("0");
      lcd.print(now.second());
    }
    else {
     lcd.print(now.second()); 
    }
    lcd.print("   ");
    
}
void displayTime(){
  DateTime now = rtc.now();
    lcd.setCursor(4, 1);
    if(now.hour()<=9)
    {
      lcd.print("0");
      lcd.print(now.hour());
    }
    else {
     lcd.print(now.hour()); 
    }
    lcd.print(':');
    if(now.minute()<=9)
    {
      lcd.print("0");
      lcd.print(now.minute());
    }
    else {
     lcd.print(now.minute()); 
    }
    lcd.print(':');
    if(now.second()<=9)
    {
      lcd.print("0");
      lcd.print(now.second());
    }
    else {
     lcd.print(now.second()); 
    }
    lcd.print("   ");

    lcd.setCursor(1, 0);
    lcd.print(daysOfTheWeek[now.dayOfTheWeek()]);
    lcd.print(",");
    if(now.day()<=9)
    {
      lcd.print("0");
      lcd.print(now.day());
    }
    else {
     lcd.print(now.day()); 
    }
    lcd.print('/');
    if(now.month()<=9)
    {
      lcd.print("0");
      lcd.print(now.month());
    }
    else {
     lcd.print(now.month()); 
    }
    lcd.print('/');
    if(now.year()<=9)
    {
      lcd.print("0");
      lcd.print(now.year());
    }
    else {
     lcd.print(now.year()); 
    }
    
  
}