#include <Wire.h>
#include "RTClib.h"
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <U8g2_for_Adafruit_GFX.h>


RTC_DS1307 rtc;

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels


#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display = Adafruit_SSD1306(128, 64, &Wire, -1); 
//Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
U8G2_FOR_ADAFRUIT_GFX u8g2_for_adafruit_gfx;

char daysOfTheWeek[7][12] = {"MIN", "SEN", "SEL", "RAB", "KAM", "JUM", "SAB"};

static const unsigned char PROGMEM Star[] = {
  0x92,0x54,0x38,0xfe,0x38,0x54,0x92
};


void setup() {
  Serial.begin(9600);
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    abort();
  }
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
  u8g2_for_adafruit_gfx.begin(display); // connect u8g2 procedures to Adafruit GFX


  /*intialize OLED display*/
  display.clearDisplay();
  display.setCursor(0,0);
  display.setTextSize(1);
  display.setTextColor(WHITE);

  u8g2_for_adafruit_gfx.setCursor(10,18);
  u8g2_for_adafruit_gfx.setFontMode(1);
  u8g2_for_adafruit_gfx.setFontDirection(0);
  u8g2_for_adafruit_gfx.setForegroundColor(WHITE);
  //display.setTextSize(2);
  u8g2_for_adafruit_gfx.setFont(u8g2_font_timB24_tn);
  u8g2_for_adafruit_gfx.print("Bismillah");
  display.display();
  delay(2500);

  //display.display(); //display initial Adafruit logo
  //delay(2000); 

  // Clear the buffer
  display.clearDisplay(); 
  display.display();

}

String MonthText(uint8_t Month){
  String MonthText;
  if (Month == 1)  MonthText = "JAN";
  if (Month == 2)  MonthText = "FEB";
  if (Month == 3)  MonthText = "MAR";
  if (Month == 4)  MonthText = "APR";
  if (Month == 5)  MonthText = "MAI";
  if (Month == 6)  MonthText = "JUN";
  if (Month == 7)  MonthText = "JUL";
  if (Month == 8)  MonthText = "AGU";
  if (Month == 9)  MonthText = "SEP";
  if (Month == 10)  MonthText = "OKT";
  if (Month == 11)  MonthText = "NOP";
  if (Month == 12)  MonthText = "DES";
  
  return MonthText;
}

String AddLeadingZero(uint8_t x){
  String AddLeadingZeroText;
  if (x < 10) AddLeadingZeroText = "0"; 
  else AddLeadingZeroText = ""; 
  AddLeadingZeroText = AddLeadingZeroText + x;
  return AddLeadingZeroText;
}

void drawCurrentTime(int x, int y, uint8_t h, uint8_t i, uint8_t s){
  display.setCursor(x, y); 
  display.setTextSize(3);
  display.setTextColor(SSD1306_WHITE); 
  display.println(AddLeadingZero(h));

  x += 30;
  display.setCursor(x, y); 
  display.setTextSize(3);
  display.setTextColor(SSD1306_WHITE); 
  display.println(":");

  x += 12;
  display.setCursor(x, y); 
  display.setTextSize(3);
  display.setTextColor(SSD1306_WHITE); 
  display.println(AddLeadingZero(i));

  x += 35;
  display.setCursor(x, (y + 14)); 
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE); 
  display.println(AddLeadingZero(s));
}

void drawCentreString(String text, int y, int width=SCREEN_WIDTH, int textSize=1, int textColor=SSD1306_BLACK) {
  // Calculate the length of the text to determine the center position 
  int16_t positionX, positionY;
  uint16_t textWidth, textHeight;
  display.setTextSize(textSize);
  display.getTextBounds(text.c_str(), 0, 0, &positionX, &positionY, &textWidth, &textHeight);
  int s_width = SCREEN_WIDTH;
  if (SCREEN_WIDTH != width) {
    s_width = width;
  }
  int16_t textX = (s_width - textWidth) / 2;

  // Display text on center
  display.setCursor(textX, y);
  display.setTextSize(textSize);
  display.setTextColor(textColor); 
  display.println(text);
}

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

  display.fillRect(0, 0, 128, 32, SSD1306_BLACK);
  display.fillRect(1, 1, 32, 9, SSD1306_WHITE);
  display.fillRect(1, 11, 32, 20, SSD1306_WHITE);
  display.fillRect(0, 32, 128, 35, SSD1306_WHITE);

  // display Day of Week
  display.setCursor(2, 2);
  display.setTextSize(1);
  display.setTextColor(SSD1306_BLACK); 
  display.println(daysOfTheWeek[now.dayOfTheWeek()]);

  display.drawBitmap(22, 2, Star, 7, 7, BLACK);

  // display Day Month Year
  display.setCursor(2, 13); 
  display.setTextSize(1);
  display.setTextColor(SSD1306_BLACK); 
  if(now.day() < 10) display.print(0);
  display.println(now.day());

  display.setCursor(15, 13); 
  display.setTextSize(1);
  display.setTextColor(SSD1306_BLACK); 
  display.println(MonthText(now.month()));

  drawCentreString(String(now.year()), 22, 35);

  display.setCursor(13, 35);
  display.setTextSize(3);
  display.println("SCOOPY");


  // display CurrentTime
  drawCurrentTime(37, 5, now.hour(), now.minute(), now.second());

  display.display();
  delay(1000);
}

void loop() {
  clockState();
}