#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "RTClib.h"

RTC_DS3231 rtc;

char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

String dow;
int days;
int months;
int years;

int hours;
int minutes;
int seconds;

int setdays;
int setmonths;
int setyears;

int sethours;
int setminutes;
int setseconds;
//pushButton 
const int pbSet = 2;
const int pbCancel = 5;
const int pbTambah = 3;
const int pbKurang = 4;
// status PushButton
int sbSet = 0;
int sbCancel = 0;
int sbTambah = 0;
int sbKurang = 0;
int tambah = 0;
int mode = 0;

int bagian = 0 ;

// int 
#define SCREEN_WIDTH 128 // panjang oled
#define SCREEN_HEIGHT 32 // lebar oled
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  Serial.begin(9600);
  pinMode(pbSet, INPUT_PULLUP);
  pinMode(pbCancel, INPUT_PULLUP);
  pinMode(pbTambah, INPUT_PULLUP);
  pinMode(pbKurang, INPUT_PULLUP);
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    abort();
  }

  // cek jika display tidak hidup
  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // ga jalan, loop terussssssssss
  }


  // Show initial display buffer contents on the screen --
  // the library initializes this with an Adafruit splash screen.
  display.display();
  delay(2000); // Pause for 2 seconds
  display.clearDisplay();
  display.display();
  delay(500);

}
void fungsiButton(){
  sbSet = digitalRead(pbSet);
  sbCancel = digitalRead(pbCancel);
  sbTambah = digitalRead(pbTambah);
  sbKurang = digitalRead(pbKurang);
  if(sbSet == 0 && mode == 0){
    mode ++;
    Serial.print("mode:");
    Serial.println(mode);
    Serial.print("bagian:");
    Serial.println(bagian);
    delay(200);
    return;
  }
  if(sbCancel == 0 && mode == 0){
    mode --;
    if(mode<0){
      mode = 0;
    }
    Serial.print("mode:");
    Serial.println(mode);
    Serial.print("bagian:");
    Serial.println(bagian);
    delay(200);
    return;
  }
  if(sbSet == 0 && mode == 1 && bagian == 0){
    bagian ++;
    Serial.print("mode:");
    Serial.println(mode);
    Serial.print("bagian:");
    Serial.println(bagian);
    delay(200);
    return;
  }
  if(sbSet == 0 && mode == 1 && bagian == 1){
    bagian ++;
    Serial.print("mode:");
    Serial.println(mode);
    Serial.print("bagian:");
    Serial.println(bagian);
    delay(200);
    return;
  }
  if(sbSet == 0 && mode == 1 && bagian == 2){
    mode ++;
    bagian=0;
    Serial.print("mode:");
    Serial.println(mode);
    Serial.print("bagian:");
    Serial.println(bagian);
    delay(200);
    return;
  }
  if(sbSet == 0 && mode == 2 && bagian == 0){
    bagian ++;
    Serial.print("mode:");
    Serial.println(mode);
    Serial.print("bagian:");
    Serial.println(bagian);
    delay(200);
    return;
  }
  if(sbSet == 0 && mode == 2 && bagian == 1){
    bagian ++;
    Serial.print("mode:");
    Serial.println(mode);
    Serial.print("bagian:");
    Serial.println(bagian);
    delay(200);
    return;
  }
  if(sbSet == 0 && mode == 2 && bagian == 2){
    adjustTime();
    mode = 0;
    bagian=0;
    Serial.print("mode:");
    Serial.println(mode);
    Serial.print("bagian:");
    Serial.println(bagian);
    delay(200);
    return;
  }
  if(sbCancel == 0 && mode == 1 && bagian == 0){
    mode --;
    if(mode<0){
      mode = 0;
    }
    Serial.print("mode:");
    Serial.println(mode);
    Serial.print("bagian:");
    Serial.println(bagian);
    delay(200);
    return;
  }
  if(sbCancel == 0 && mode == 1 && bagian == 1){
    bagian --;
    if(bagian<0){
      bagian = 0;
    }
    Serial.print("mode:");
    Serial.println(mode);
    Serial.print("bagian:");
    Serial.println(bagian);
    delay(200);
    return;
  }
  if(sbCancel == 0 && mode == 1 && bagian == 2){
    bagian --;
    if(bagian<0){
      bagian = 0;
    }
    Serial.print("mode:");
    Serial.println(mode);
    Serial.print("bagian:");
    Serial.println(bagian);
    delay(200);
    return;
    
  }
  if(sbCancel == 0 && mode == 2 && bagian == 0){
    mode --;
    if(mode<0){
      mode = 0;
    }
    Serial.print("mode:");
    Serial.println(mode);
    Serial.print("bagian:");
    Serial.println(bagian);
    delay(200);
    return;
  }
  if(sbCancel == 0 && mode == 2 && bagian == 1){
    bagian --;
    if(bagian<0){
      bagian = 0;
    }
    Serial.print("mode:");
    Serial.println(mode);
    Serial.print("bagian:");
    Serial.println(bagian);
    delay(200);
    return;
  }
  if(sbCancel == 0 && mode == 2 && bagian == 2){
    bagian --;
    if(bagian<0){
      bagian = 0;
    }
    Serial.print("mode:");
    Serial.println(mode);
    Serial.print("bagian:");
    Serial.println(bagian);
    delay(200);
    return;
    
  }
  //btn + -  time
  if(sbTambah == 0 && mode == 1 && bagian == 0){
    sethours = hours++;
    if (hours > 23) {
            hours = 0;}
    setTime();
    delay(50);
    return;
  }
  if(sbKurang == 0 && mode ==1 && bagian == 0){
    sethours = hours--;
    if (hours < 0) {
            hours = 23;}
    setTime();
    delay(50);
    return;
  }
  if(sbTambah == 0 && mode == 1 && bagian == 1){
    setminutes = minutes++;
    if(minutes > 59){
            minutes = 0;
            hours ++;
          }
    setTime();
    delay(50);
    return;
  }
  if(sbKurang == 0 && mode ==1 && bagian == 1){
    setminutes = minutes--;
    if(minutes < 0){
            minutes = 59;
            hours--;
          }
    setTime();
    delay(50);
    return;
  }
  if(sbTambah == 0 && mode == 1 && bagian == 2){
    setseconds = seconds++;
        if(seconds > 59){
            seconds = 0;
            minutes++;
          }
    setTime();
    delay(50);
    return;
  }
  if(sbKurang == 0 && mode ==1 && bagian == 2){
    setseconds = seconds--;
    if(seconds < 0){
            seconds = 59;
            minutes--;
          }
    setTime();
    delay(50);
    return;
  }
  //btn +- date
  if(sbTambah == 0 && mode == 2 && bagian == 0){
    setdays = days++;
    batasAtasHari();
    setDate();
    delay(50);
    return;
  }
  if(sbKurang == 0 && mode == 2 && bagian == 0){
    setdays = days--;
    batasBawahHari();
    setDate();
    delay(50);
    return;
  }
  if(sbTambah == 0 && mode == 2 && bagian == 1){
    setmonths = months++;
    batasAtasHari();
    setDate();
    delay(50);
    return;
  }
  if(sbKurang == 0 && mode == 2 && bagian == 1){
    setmonths = months--;
    batasBawahHari();
    setDate();
    delay(50);
    return;
  }
  if(sbTambah == 0 && mode == 2 && bagian == 2){
    setyears = years++;
    batasAtasHari();
    setDate();
    delay(50);
    return;
  }
  if(sbKurang == 0 && mode == 2 && bagian == 2){
    setyears = years--;
    batasBawahHari();
    setDate();
    delay(50);
    return;
  }
}

void getTime(){
  DateTime now = rtc.now();

  dow = daysOfTheWeek[now.dayOfTheWeek()];// ambil hari dari rtc
  days = now.day();// ambil hari dari rtc
  months = now.month();// ambil bulan dari rtc
  years = now.year();// ambil tahun dari rtc

  hours = now.hour();// ambil jam dari rtc
  minutes = now.minute();// ambil menit dari rtc
  seconds = now.second();// ambil detik dari rtc
}
void jamDigital(){
  getTime();
  display.clearDisplay();
  display.setTextSize(1); // atur ukuran Text
  display.setTextColor(SSD1306_WHITE);// warna text
  display.setCursor(10, 0);// penempatan text
  display.print(dow);
  display.print(" ");
  display.print(String(days).length() == 1 ? "0" + String(days) : String(days));
  display.print("/");
  display.print(String(months).length() == 1 ? "0" + String(months) : String(months));
  display.print("/");
  display.print(years);
  display.setTextSize(2);
  display.setCursor(10, 10);
  display.print(String(hours, DEC).length() == 1 ? "0" + String(hours) : String(hours));
  display.print(":");
  display.print(String(minutes, DEC).length() == 1 ? "0" + String(minutes) : String(minutes));
  display.print(":");
  display.print(String(seconds, DEC).length() == 1 ? "0" + String(seconds) : String(seconds));
  display.display();      // Show initial text
}
void setTime(){
  sethours = hours;
  setminutes = minutes;
  setseconds = seconds;
  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);// warna text
  display.setTextSize(1);
  display.setCursor(0, 0);
  display.print(" JAM ");
  display.print(":");
  display.print(" MIN ");
  display.print(":");
  display.print(" DET ");
  display.setTextSize(2);
  display.setCursor(0, 10);
  display.print(String(sethours, DEC).length() == 1 ? "0" + String(sethours) : String(sethours));
  display.print(":");
  display.print(String(setminutes, DEC).length() == 1 ? "0" + String(setminutes) : String(setminutes));
  display.print(":");
  display.print(String(setseconds, DEC).length() == 1 ? "0" + String(setseconds) : String(setseconds));
  display.display(); 
}
void setDate(){
  setdays = days;
  setmonths = months;
  setyears = years;
  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);// warna text
  display.setTextSize(1);
  display.setCursor(0, 0);
  display.print("Day");
  display.print(" / ");
  display.print("Month");
  display.print(" / ");
  display.print("Year");
  display.setTextSize(2);
  display.setCursor(0, 10);
  display.print(String(setdays).length() == 1 ? "0" + String(setdays) : String(setdays));
  display.print("/");
  display.print(String(setmonths).length() == 1 ? "0" + String(setmonths) : String(setmonths));
  display.print("/");
  display.print(years);
  display.display(); 
}
void batasAtasHari(){
  if(years % 4 == 0){
    if(months == 2){
      if(days > 29){
        days = 1;
        months++;
      }
    }
  }
  if(years % 4 != 0){
    if(months == 2){
      if(days > 28){
        days = 1;
        months++;
      }
    }
  }
  if ((months == 1 || months == 3 || months == 5 || months == 7 || months == 8 || months == 10 || months == 12) && days > 31) {
    if(days > 31){
      days = 1;
      months++;
    }
  }
  if(months == 4 || months == 6 || months == 9 || months == 11 ){
    if(days > 30){
      days = 1;
      months++;
    }
  }
  if(months > 12){
    months = 1;
    years++;
  }
}
void batasBawahHari(){
  if(years % 4 == 0){
    if(months == 3){
      if(days < 1){
        days = 29;
        months--;
      }
    }
  }
  if(years % 4 != 0){
    if(months == 3){
      if(days < 1){
        days = 28;
        months--;
      }
    }
  }
  if(months == 5 || months == 7 || months == 10 || months == 12){
    if(days < 1){
      days = 30;
      months--;
    }
  }
  if(months == 1 || months == 8 ||  months == 2 || months == 4 || months == 6 || months == 9 || months == 11 ){
    if(days < 1){
      days = 31;
      months--;
    }
  }
  if(months < 1){
    months = 12;
    years--;
  }
}
void adjustTime(){
  rtc.adjust(DateTime(setyears,setmonths,setdays,sethours,setminutes,setseconds));
}

void loop() {
  fungsiButton();
  if(mode == 1 && bagian == 0){
    setTime();
  }
  if(mode == 2 && bagian == 0){
    setDate();
  }

  if(mode == 0){
    jamDigital();
  }
}