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

LiquidCrystal_I2C lcd(0x27, 16, 2);

RTC_DS1307 rtc;

int up = 2; //tombol +
int down = 3; //tombol -
int enter = 4; //tombol set menu

//----variabel-----
int hourupg;
int minupg;
int yearupg;
int monthupg;
int dayupg;
int menu =0;

char lcdbuff[16];
unsigned long millisSebelumnya;
bool blink;

void setup() {
  pinMode (up, INPUT_PULLUP);
  pinMode (down, INPUT_PULLUP);
  pinMode (enter, INPUT_PULLUP);

  lcd.init();
  lcd.backlight();

  lcd.setCursor(0,0);
  lcd.print("coba");
  delay(1000);

  lcd.clear();
  Serial.begin(9600);
  Wire.begin();
  rtc.begin();

  if (! rtc.isrunning()) {
    Serial.println("RTC is NOT running!");
    rtc.adjust(DateTime(__DATE__, __TIME__));// Set the date and time at compile time
  }
  // rtc.adjust(DateTime(__DATE__, __TIME__)); //removing "//" to adjust the time
  // The default display shows the date and time
  //int menu=0;
}

void loop() {
//DisplayDateTime();

if (digitalRead(enter)==LOW){menu=menu+1;}
else if(menu >=6){menu=0;}
delay(90);
Serial.println(menu);
switch(menu){
  case 0: DisplayDateTime(); break;
  case 1: DisplaySetHour(); break;
  case 2: DisplaySetMinute(); break;
  case 3: DisplaySetYear(); break;
  case 4: DisplaySetMonth(); break;
  case 5: DisplaySetDay(); break;
  case 6: StoreAgg(); break;
  default :DisplayDateTime();
}

}

// menampilkan waktu dan tanggal saat ini//
/*void DisplayDateTime (){
  DateTime now = rtc.now();
  lcd.setCursor(0, 1);
  lcd.print("Hour:");
  if (now.hour()<=9){lcd.print("0");}
  lcd.print(now.hour(), DEC);
  hourupg=now.hour();
  lcd.print(":");
  if (now.minute()<=9){lcd.print("0");}
  lcd.print(now.minute(), DEC);
  minupg=now.minute();
  lcd.print(":");
  if (now.second()<=9){lcd.print("0");}
  lcd.print(now.second(), DEC);
//-----------------------------------
  lcd.setCursor(0, 0);
  lcd.print("Date: ");
  if (now.day()<=9){lcd.print("0");}
  lcd.print(now.day(), DEC);
  dayupg=now.day();
  lcd.print("/");
  if (now.month()<=9){lcd.print("0");}
  lcd.print(now.month(), DEC);
  monthupg=now.month();
  lcd.print("/");
  lcd.print(now.year(), DEC);
  yearupg=now.year();
}*/
void DisplayDateTime (){
  DateTime now = rtc.now();
  char* dot = " ";
  if (!blink) dot = ":";
  sprintf(lcdbuff, "%02i/%02i/%04i %02i%s%02i", now.day(), now.month(),now.year(), now.hour(), dot, now.minute());
  lcd.setCursor(0,0);
  lcd.print(lcdbuff);
  dayupg = now.day();
  monthupg = now.month();
  yearupg = now.year();
  hourupg = now.hour();
  minupg = now.minute();
  //blink
  if(millis()-millisSebelumnya <250){blink=true;}
  else if(millis()-millisSebelumnya >250 && millis()-millisSebelumnya <500){blink=false;}
  else if(millis()-millisSebelumnya >500){millisSebelumnya=millis();}
}

//---seting hour ---------------------
void DisplaySetHour(){
  lcd.clear();
  DateTime now = rtc.now();
  if(digitalRead(up)==LOW)
  {
    if(hourupg==23){hourupg=0;}
    else{hourupg=hourupg+1;}
  }
   if(digitalRead(down)==LOW)
  {
    if(hourupg==0){hourupg=23;}
    else {hourupg=hourupg-1;}
  }
  lcd.setCursor(0,0);
  lcd.print("Set time:");
  lcd.setCursor(0,1);
  lcd.print(hourupg,DEC);
  delay(90);
}
//------------------Setting the minutes-------
void DisplaySetMinute(){
  lcd.clear();
  if(digitalRead(up)==LOW)
  {
    if (minupg==59){minupg=0;}
    else {minupg=minupg+1;}
  }
   if(digitalRead(down)==LOW)
  {
    if (minupg==0){minupg=59;}
    else{minupg=minupg-1;}
  }
  lcd.setCursor(0,0);
  lcd.print("Set Minutes:");
  lcd.setCursor(0,1);
  lcd.print(minupg,DEC);
  delay(100);
}
void DisplaySetYear()
{
// setting the year
  lcd.clear();
  if(digitalRead(up)==LOW){yearupg=yearupg+1;}
   if(digitalRead(down)==LOW){yearupg=yearupg-1;}
  lcd.setCursor(0,0);
  lcd.print("Set Year:");
  lcd.setCursor(0,1);
  lcd.print(yearupg,DEC);
  delay(200);
}

void DisplaySetMonth()
{
// Setting the month
  lcd.clear();
  if(digitalRead(up)==LOW)
  {
    if (monthupg==12){monthupg=1;}
    else{monthupg=monthupg+1;}
  }
   if(digitalRead(down)==LOW)
  {
    if (monthupg==1){monthupg=12;}
    else{monthupg=monthupg-1;}
  }
  lcd.setCursor(0,0);
  lcd.print("Set Month:");
  lcd.setCursor(0,1);
  lcd.print(monthupg,DEC);
  delay(200);
}

void DisplaySetDay()
{
// Setting the day
  lcd.clear();
  if(digitalRead(up)==LOW)
  {
    if (dayupg==31){dayupg=1;}
    else{dayupg=dayupg+1;}
  }
   if(digitalRead(down)==LOW)
  {
    if (dayupg==1){dayupg=31;}
    else{dayupg=dayupg-1;}
  }
  lcd.setCursor(0,0);
  lcd.print("Set Day:");
  lcd.setCursor(0,1);
  lcd.print(dayupg,DEC);
  delay(200);
}
void StoreAgg()
{
// Variable saving
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("menyimpan");
  rtc.adjust(DateTime(yearupg,monthupg,dayupg,hourupg,minupg,0));
  delay(200);
}