#include "RTClib.h"
 #include "U8glib.h"
 #include "Wire.h"
U8GLIB_SSD1306_128X64 oled(U8G_I2C_OPT_NONE|U8G_I2C_OPT_DEV_0);  // I2C / TWI 

int horas;
int minutos;
int segundos;

char *numero[12]={"6","5","4","3","2","1","12","11","10","9","8","7"};
const int oled_ancho = 128;
const int oled_alto = 64;
float radio = min(oled_alto, oled_ancho)/2-1;

const int centro_x = oled_ancho / 2;
const int centro_y = oled_alto / 2;

/*int x1, y1, x2, y2;
double angulo;*/

//uint8_t horas, minutos, segundos;

RTC_DS1307 rtc;

void setup(void) {
  
Serial.begin(9600);
rtc.begin();
//rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
//rtc.adjust(DateTime(2023. 5. 29, 12, 48, 0));
//rtc.isrunning();
}

void DatoTiempo(){
    DateTime now = rtc.now();
    horas = now.hour();
    minutos = now.minute();
    segundos = now.second();
}

void loop(void) {
  DatoTiempo();
  oled.firstPage();  
  do {
    draw();
  } while( oled.nextPage() );
}

void draw(void ) {
  int x1, y1, x2, y2;
  double angulo;

  //oled.drawCircle(centro_x, centro_y, radio);
  oled.drawCircle(centro_x, centro_y, 1);
  //draw minute's ticks (60 lines)
  for(int j=1; j<=60; j++){
    angulo = j*6;
    angulo = angulo * 0.0174533;

    x1 = centro_x + (sin(angulo) * radio);
    y1 = centro_y + (cos(angulo) * radio);
    x2 = centro_x + (sin(angulo) * (radio));
    y2 = centro_y + (cos(angulo) * (radio));
    oled.drawLine(x1,y1,x2,y2);
  } 
  //draw hour's ticks (12 lines)
  for(int j=0; j<12; j++){
    angulo = j*30;
    angulo = angulo * 0.0174533;

    x1 = centro_x + (sin(angulo) * radio);
    y1 = centro_y + (cos(angulo) * radio);
    x2 = centro_x + (sin(angulo) * (radio - 4));
    y2 = centro_y + (cos(angulo) * (radio - 4));
    oled.drawLine(x1,y1,x2,y2);

    //draw hour digits(12 lines)
    x2 = centro_x + (sin(angulo) * (radio - 8));
    y2 = centro_y + (cos(angulo) * (radio - 8));
    oled.setFont(u8g_font_chikita);
    oled.drawStr(x2-2, y2+3, String(numero[j]).c_str());
  
 /* oled.setFont(u8g_font_6x12);
    oled.setPrintPos(58, 14); 
    oled.print("12");
    oled.setPrintPos(39, 35); 
    oled.print("9");
    oled.setPrintPos(62, 58); 
    oled.print("6");
    oled.setPrintPos(85, 35); 
    oled.print("3");  */
 
    angulo = segundos*6;
    angulo = angulo * 0.0174533;
    x2 = centro_x + (sin(angulo) * (radio - 1));
    y2 = centro_y - (cos(angulo) * (radio - 1));
    oled.drawLine(centro_x,centro_y,x2,y2);

    angulo = minutos*6;
    angulo = angulo * 0.0174533;
    x2 = centro_x + (sin(angulo) * (radio - 10));
    y2 = centro_y - (cos(angulo) * (radio - 10));
    oled.drawLine(centro_x,centro_y,x2,y2); 

    angulo = horas*30 + ((minutos / 12) * 6);
    angulo = angulo * 0.0174533;
    x2 = centro_x + (sin(angulo) * (radio / 2)); 
    y2 = centro_y - (cos(angulo) * (radio / 2));  
    oled.drawLine(centro_x,centro_y,x2,y2);  
  }
}