#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

// Timer animasi
unsigned long lastBlink = 0;
unsigned long lastMouth = 0;

bool blinkState = false;
bool mouthOpen = false;

void setup() {

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    for(;;);
  }

  display.clearDisplay();
}

void loop() {

  // Kedip tiap 4 detik
  if (millis() - lastBlink > 2000) {
    blinkState = true;
    drawFace();
    delay(200);

    blinkState = false;
    lastBlink = millis();
  }

  // Mulut buka tiap 10 detik
  if (millis() - lastMouth > 7000) {
    mouthOpen = true;
    drawFace();
    delay(700);

    mouthOpen = false;
    lastMouth = millis();
  }

  drawFace();
}

void drawFace() {

  display.clearDisplay();

  // Mata kiri
  if (blinkState) {
    display.fillRect(38, 26, 14, 3, WHITE);
  } else {
    display.fillRoundRect(38, 20, 14, 20, 5, WHITE);
  }

  // Mata kanan
  if (blinkState) {
    display.fillRect(76, 26, 14, 3, WHITE);
  } else {
    display.fillRoundRect(76, 20, 14, 20, 5, WHITE);
  }

  // Mulut
  if (mouthOpen) {

    // Mulut terbuka
    display.fillRoundRect(56, 42, 16, 10, 4, WHITE);

  } else {

    // Senyum kecil
    display.drawRoundRect(56, 42, 16, 6, 3, WHITE);
  }

  display.display();
}