#include "RTClib.h"
#include <U8g2lib.h>
#include <Wire.h>

// oled display
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

RTC_DS1307 rtc;


// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
// Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(128, 64, &Wire, -1);

int ShiftYH;
int ShiftXH;
int hour;
int ShiftYM;
int ShiftXM;
int minute;

void setup() {

  Serial.begin(9600);
  rtc.begin();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3c);

  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    abort();
  } 

}

void loop() {

  DateTime now = rtc.now();
  display.clearDisplay();
  display.setCursor(0,0); 
  display.print(now.hour()); 
  display.print(":");
  if(now.minute() < 10){
    display.print("0");
    display.print(now.minute());
  }
  else{
     display.print(now.minute());   
  }

  display.setCursor(70,5);
  display.print("12");
  display.setCursor(98,29);
  display.print("3");
  display.setCursor(74,54);
  display.print("6");
  display.setCursor(49,29);
  display.print("9");

  if(now.hour() > 12){
    hour = now.hour() -12;
  }
  else{
    hour = now.hour();
  }
  minute = now.minute();

  float hrAngle = (hour*0.5236) - 1.5708;
  float minAngle = (minute*0.10472) - 1.5708;

  ShiftYH = 8*(sin(hrAngle)) + 32;
  ShiftXH = 8*(cos(hrAngle)) + 75;
  ShiftYM = 17*(sin(minAngle)) + 32;
  ShiftXM = 17*(cos(minAngle)) + 75;

  display.drawCircle(75, 32, 31, WHITE);
  display.drawLine(75, 32, ShiftXH, ShiftYH, WHITE);
  display.drawLine(75, 32, ShiftXM, ShiftYM, WHITE);
  display.display();

}