#include "U8glib.h"

// Use the SH1106 driver as it seems SH1107 is not available
U8GLIB_SH1106_128X64 u8g(U8G_I2C_OPT_NONE | U8G_I2C_OPT_DEV_0);  // I2C / TWI

const int SCREEN_WIDTH = 128;
const int SCREEN_HEIGHT = 64;
float radius = min(SCREEN_HEIGHT, SCREEN_WIDTH) / 2 - 1;

const int X_CENTER = SCREEN_WIDTH / 2;
const int Y_CENTER = SCREEN_HEIGHT / 2;

void draw(void) {
  // Increase OLED brightness
  u8g.setContrast(255); // Set the OLED brightness to maximum

  // Clear the screen
  u8g.firstPage();
  do {
    // Draw 4 concentric circles with a common center
    for (int i = 0; i < 4; i++) {
      u8g.drawCircle(X_CENTER, Y_CENTER, radius - (i * 10));
    }
  } while (u8g.nextPage());

  // Print "Hello, World!" for 3 seconds
  u8g.setFont(u8g_font_chikita);
  u8g.firstPage();
  do {
    u8g.drawStr(0, 30, " by ARVIND");
  } while (u8g.nextPage());

  delay(2000);

  // Rebuild the concentric circles after some delay
  u8g.firstPage();
  do {
    // Draw 4 concentric circles with a common center again
    for (int i = 0; i < 4; i++) {
      u8g.drawCircle(X_CENTER, Y_CENTER, radius - (i * 10));
    }
  } while (u8g.nextPage());

  // Rebuild the picture after another delay
  delay(1500);
}

void setup(void) {
  // flip screen, if required
  // u8g.setRot180();
}

void loop(void) {
  draw();
}