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

// ESP32-C3 Mini I2C pins: SDA=8, SCL=9
U8G2_SH1107_128X128_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE, /* clock=*/ 9, /* data=*/ 8);

void setup() {
  u8g2.begin();
  u8g2.setContrast(255);
}

void loop() {
  // Page buffer drawing
  u8g2.firstPage();
  do {
    // 1. Text demo
    u8g2.setFont(u8g2_font_8x13B_mn);
    u8g2.drawStr(10, 20, "Hello OLED!");

    // 2. Lines
    u8g2.drawLine(0, 30, 127, 30);
    u8g2.drawLine(0, 31, 127, 60);

    // 3. Rectangles
    u8g2.drawFrame(10, 40, 40, 20);   // outline
    u8g2.drawBox(60, 40, 40, 20);     // filled

    // 4. Circles
    u8g2.drawCircle(30, 90, 15, U8G2_DRAW_ALL);
    u8g2.drawDisc(90, 90, 15);        // filled circle

    // 5. Triangles
    u8g2.drawTriangle(10, 110, 30, 110, 20, 80);

    // 6. Different font sizes
    u8g2.setFont(u8g2_font_5x8_mf);
    u8g2.drawStr(10, 120, "AI Centre Nandurbar");
  } while (u8g2.nextPage());

  delay(2000); // refresh every 2 seconds
}