#include "RTClib.h"                   //library RTC1307
#include <Wire.h>                   
#include <LiquidCrystal_I2C.h>        //library LCD16x2I2C

RTC_DS1307 rtc;                       //inisialisasi rtc
LiquidCrystal_I2C lcd(0x27, 16, 2);   //inisialisasi lcd 16x2

char daysOfTheWeek[7][12] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};  //inisialisasi hari (weekday)

int menu;                             //inisialisasi menu
int second,minute,hour,weekday;       //inisialisasi detik,menit,jam,hari
int monthday,month,year;              //inisialisasi tanggal,bulan,tahun

boolean up = false;                   
boolean down = false;

void setup () {
  lcd.init();
  lcd.backlight();
  Wire.begin();
  Serial.begin(9600);
  pinMode(8,INPUT_PULLUP);
  pinMode(9,INPUT_PULLUP);
  pinMode(10,INPUT_PULLUP);
  pinMode(11,INPUT_PULLUP);
  //tampilan awal
  lcd.setCursor(0,0); 
  lcd.print("Kalender Digital");
  delay(2000);
  lcd.clear();
  //cek rtc
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    abort();
  }
  simpan_rtc();
}

void loop() 
{
  display();
  tombol();
}

void tombol(){
  if (digitalRead(8)==0){
    lcd.clear();
    lcd.print("Setting RTC");
    delay(2000);
    menu++;
    lcd.clear();
    display();
    lcd.blink();
    do{
//------------------------next
      if (digitalRead(8)==0){
        delay(300);
        menu++;
      }
//-- ------------------back
      else if (digitalRead(9)==0){
        delay(300);
        if (menu > 1){
        menu--;
        }
      }
//---------------------------up
      else if(digitalRead(10)==0){
        delay(200);
        up=true;
      }
//----------------------------down
      else if(digitalRead(11)==0){
        delay(200);
        down=true;
      }
//-------------------------edit data jam
      if (menu==1){
        if(up==true && hour<24){
          hour++;
          display_edit();
        }
        else if(down==true && hour>0){
          hour--;
          display_edit();
        }
        up=false;
        down=false;
        if (hour<10){
          lcd.setCursor(5,0);
        }
        else {
          lcd.setCursor(6,0);
        }
      }
//-------------------------edit data menit
      else if (menu==2){
        if (up==true && minute<59){
          minute++;
          display_edit();
        }
        else if (down==true && minute>0){
          minute--;
          display_edit();
        }
        up=false;
        down=false;
        if (hour<10 && minute<10){
          lcd.setCursor(7,0);
        }
        else if (hour<10 && minute>9) {
          lcd.setCursor(8,0);
        }
        else if (hour>9 && minute<10){
          lcd.setCursor(8,0);
        }
        else if (hour>9 && minute>9){
          lcd.setCursor(9,0);
        }
      }
//-------------------------edit data detik
      else if (menu==3){
        if (up==true && second<59){
          second++;
          display_edit();
        }
        else if (down==true && second>0){
          second--;
          display_edit();
        }
        up=false;
        down=false;
        if (hour<10 && minute<10 && second<10){
          lcd.setCursor(9,0);
        }
        else if (hour<10 && minute<10 && second>9){
          lcd.setCursor(10,0);
        }
        else if (hour<10 && minute>9 && second<10){
          lcd.setCursor(10,0);
        }
        else if (hour>9 && minute<10 && second<10){
          lcd.setCursor(10,0);
        }
        else if (hour<10 && minute>9 && second>9){
          lcd.setCursor(11,0);
        }
        else if (hour>9 && minute>9 && second<10){
          lcd.setCursor(11,0);
        }
        else if (hour>9 && minute<10 && second>9){
          lcd.setCursor(11,0);
        }
        else if (hour>9 && minute>9 && second>9){
          lcd.setCursor(12,0);
        }
      }
//-------------------------edit data hari
      else if (menu==4){
        if (up==true && weekday < 6){
          weekday++;
          display_edit();
        }
        else if (down==true && weekday>0){
          weekday--;
          display_edit();
        }
        up=false;
        down=false;
        lcd.setCursor(1,1);
      }
//-------------------------edit data tanggal
      else if (menu==5){
        if (up==true && monthday < 31){
          monthday++;
          display_edit();
        }
        else if (down==true && monthday>1){
          monthday--;
          display_edit();
        }
        up=false;
        down=false;
        if (monthday<10){
          lcd.setCursor(5,1);
        }
        else {
          lcd.setCursor(6,1);
        }
      }
//-------------------------edit data bulan
      else if (menu==6){
        if (up==true && month < 12){
          month++;
          display_edit();
        }
        else if (down==true && month>1){
          month--;
          display_edit();
        }
        up=false;
        down=false;
        if (monthday<10 && month<10){
          lcd.setCursor(7,1);
        }
        else if (monthday<10 && month>9){
          lcd.setCursor(8,1);
        }
        else if (monthday>9 && month<10){
          lcd.setCursor(8,1);
        }
        else if (monthday>9 && month>9){
          lcd.setCursor(9,1);
        }
      }
//-------------------------edit data tahun
      else if (menu==7){
        if (up==true && year < 99){
          year++;
          display_edit();
        }
        else if (down==true && year>0){
          year--;
          display_edit();
        }
        up=false;
        down=false;
        if (monthday<10 && month<10 && year<10){
          lcd.setCursor(11,1);
        }
        else if (monthday<10 && month<10 && year>9){
          lcd.setCursor(12,1);
        }
        else if (monthday<10 && month>9 && year<10){
          lcd.setCursor(12,1);
        }
        else if (monthday>9 && month<10 && year<10){
          lcd.setCursor(12,1);
        }        
        else if (monthday<10 && month>9 && year>9){
          lcd.setCursor(13,1);
        }
        else if (monthday>9 && month>9 && year<10){
          lcd.setCursor(13,1);
        }
        else if (monthday>9 && month<10 && year>9){
          lcd.setCursor(13,1);
        }
        else if (monthday>9 && month>9 && year>9){
          lcd.setCursor(14,1);
        }
      }
      // Serial.println(menu);
//-------------------------simpan data RTC
      if(menu==8)settingRTC();
    }
    while(menu<8);
      lcd.clear();
      lcd.noBlink();
      lcd.print("Setting RTC OK!");
      delay(1000);
      lcd.clear();
      menu=0;
  }
}

void display () {
  DateTime now = rtc.now();
  lcd.setCursor(0,0);
  lcd.print("Time: ");
  lcd.setCursor(5,0);
  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(daysOfTheWeek[now.dayOfTheWeek()]);
  lcd.print(", ");
  lcd.print(now.day(), DEC);
  lcd.print('/');
  lcd.print(now.month(), DEC);
  lcd.print('/');
  lcd.print(now.year(), DEC);
}

void simpan_rtc()
{
  DateTime now = rtc.now();
  hour=now.hour();
  minute=now.minute();
  second=now.second();
  monthday=now.day();
  month=now.month();
  year=now.year();
}

void display_edit () {
  //DateTime now = rtc.now();
  lcd.setCursor(0,0);
  lcd.print("Time: ");
  lcd.setCursor(5,0);
  lcd.print(hour);
  lcd.print(':');
  lcd.print(minute);
  lcd.print(':');
  lcd.print(second);
  lcd.setCursor(0,1);
  hari();
  lcd.setCursor(5,1);
  lcd.print(monthday);
  lcd.print('/');
  lcd.print(month);
  lcd.print("/");
  lcd.print(year);
}

void hari()
{
  if(weekday==0){
    lcd.print("Sun, ");
  }
  else if(weekday==1){
    lcd.print("Mon, ");
  }
  else if(weekday==2){
    lcd.print("Tue, ");
  }
  else if(weekday==3){
    lcd.print("Wed, ");
  }
  else if(weekday==4){
    lcd.print("Thu, ");
  }
  else if(weekday==5){
    lcd.print("Fri, ");
  }
  else if(weekday==6){
    lcd.print("Sat, ");
  }
}
void settingRTC(){
    rtc.adjust(DateTime(year, month, monthday, hour, minute, second)); // Set Tahun, bulan, tanggal, jam, menit, detik secara manual
}