#include <Wire.h>
#include <Adafruit_NeoPixel.h>

#define I2C_DEV_ADDR 0x55
#define NEOPIXEL_PIN 19 // Change as needed
#define MAX_PIXELS 100

Adafruit_NeoPixel strip(MAX_PIXELS, NEOPIXEL_PIN, NEO_GRB + NEO_KHZ800);

uint8_t pixelCount = 1;

void receiveEvent(int len) {
  delay(50); // Add more delay for stability as requested

  if (len < 1) return;
  uint8_t cmd = Wire.read();

  if (cmd == 0x01 && len >= 2) { // Set pixel count
    pixelCount = Wire.read();
    strip.updateLength(pixelCount);
    strip.begin();
    strip.show();
  }
  else if (cmd == 0x02 && len >= 5) { // Set all pixels: R G B I
    uint8_t r = Wire.read();
    uint8_t g = Wire.read();
    uint8_t b = Wire.read();
    uint8_t intensity = Wire.read();
    for (int i = 0; i < pixelCount; i++) {
      strip.setPixelColor(i, strip.Color(r * intensity / 255, g * intensity / 255, b * intensity / 255));
    }
    strip.show();
  }
  else if (cmd == 0x03 && len >= 6) { // Set one pixel: N R G B I
    uint8_t n = Wire.read();
    uint8_t r = Wire.read();
    uint8_t g = Wire.read();
    uint8_t b = Wire.read();
    uint8_t intensity = Wire.read();
    if (n < pixelCount) {
      strip.setPixelColor(n, strip.Color(r * intensity / 255, g * intensity / 255, b * intensity / 255));
      strip.show();
    }
  }
}

void setup() {
  strip.begin();
  strip.show();
  Wire.begin(I2C_DEV_ADDR, 8, 9); // ESP32-S3 default I2C pins: SDA=8, SCL=9
  Wire.onReceive(receiveEvent);
}

void loop() {
  delay(100); // Main loop delay, not critical
}