#include <U8g2lib.h>
#include <Wire.h>
#include <TimeLib.h>

U8G2_ILI9341_240X320_F_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);

void drawClock() {
  int sVal = second();
  int mVal = minute();
  int hVal = hour() % 12;

  // Clear the buffer
  u8g2.clearBuffer();

  // Draw clock face
  u8g2.drawCircle(120, 160, 120);

  // Draw hour hand
  u8g2.drawLine(120, 160, 120 + 60 * cos((hVal * 30 + mVal / 2.0) * PI / 180), 160 + 60 * sin((hVal * 30 + mVal / 2.0) * PI / 180));

  // Draw minute hand
  u8g2.drawLine(120, 160, 120 + 80 * cos((mVal * 6 + sVal / 10.0) * PI / 180), 160 + 80 * sin((mVal * 6 + sVal / 10.0) * PI / 180));

  // Draw second hand
  u8g2.setColorIndex(1);
  u8g2.drawLine(120, 160, 120 + 100 * cos(sVal * 6 * PI / 180), 160 + 100 * sin(sVal * 6 * PI / 180));
  u8g2.setColorIndex(0);

  // Send the buffer to the display
  u8g2.sendBuffer();
}

void setup(void) {
  // Initialize ILI9341
  u8g2.begin();

  // Set font
  u8g2.setFont(u8g2_font_unifont_t_symbols);

  // Initialize Time library
  setTime(0, 0, 0, 1, 1, 2023);
}

void loop(void) {
  drawClock();

  // Refresh display
  u8g2.setCursor(5, 312);
  u8g2.print("Analog Clock");

  // Update every second
  delay(1000);

  // Update Time library
  adjustTime(1);
}