#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SH110X.h>

// I2C pins for ESP32-C3 SuperMini
#define I2C_SDA 6
#define I2C_SCL 7

// SH1107 128x128 OLED
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 128
#define OLED_RESET    -1   // Reset pin not used
#define I2C_ADDRESS   0x3C // Typical SH1107 I2C address

Adafruit_SH1107 display(SCREEN_HEIGHT, SCREEN_WIDTH, &Wire, OLED_RESET);

void setup() {
  Wire.begin(I2C_SDA, I2C_SCL);
  Serial.begin(115200);
  Serial.println("ESP32-C3 SuperMini + SH1107 OLED Demo");

  if (!display.begin(I2C_ADDRESS, true)) {
    Serial.println("SH1107 allocation failed");
    for (;;);
  }

  display.clearDisplay();
  display.display();

  // Welcome text
  display.setTextSize(1);
  display.setTextColor(SH110X_WHITE);
  display.setCursor(10, 10);
  display.println("Hello ESP32-C3!");
  display.setCursor(10, 25);
  display.println("SH1107 OLED Demo");
  display.display();
  delay(2000);
}

void loop() {
  // Clear screen
  display.clearDisplay();

  // Draw shapes
  display.drawRect(5, 5, 40, 40, SH110X_WHITE);
  display.fillCircle(80, 25, 20, SH110X_WHITE);
  display.drawTriangle(20, 80, 60, 60, 100, 100, SH110X_WHITE);

  // Text overlay
  display.setTextSize(1);
  display.setCursor(10, 110);
  display.println("Shapes + Text");

  display.display();
  delay(2000);

  // Invert demo
  display.invertDisplay(true);
  delay(1000);
  display.invertDisplay(false);

  // Simple smiley face demo
  display.clearDisplay();
  display.fillCircle(64, 64, 30, SH110X_WHITE);   // Face outline
  display.fillCircle(54, 54, 4, SH110X_BLACK);    // Left eye
  display.fillCircle(74, 54, 4, SH110X_BLACK);    // Right eye

  // Approximate smile arc using pixels
  for (int angle = 200; angle < 340; angle += 5) {
    float rad = angle * 3.14159 / 180;
    int x = 64 + cos(rad) * 15;
    int y = 70 + sin(rad) * 15;
    display.drawPixel(x, y, SH110X_BLACK);
  }

  display.display();
  delay(2000);
}