#include <Adafruit_GFX.h>
#include <Adafruit_NeoMatrix.h>
#include <Adafruit_NeoPixel.h>

#define PIN 4   // Data pin to RGB matrix (GPIO4 works well on ESP32-C3)

Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(
  32, 8, PIN,
  NEO_MATRIX_TOP + NEO_MATRIX_LEFT +
  NEO_MATRIX_ROWS + NEO_MATRIX_PROGRESSIVE,
  NEO_GRB + NEO_KHZ800);

unsigned long lastMillis = 0;
int mode = 0;

void setup() {
  matrix.begin();
  matrix.setBrightness(60);
  matrix.fillScreen(0);
  matrix.show();
}

void loop() {
  if (millis() - lastMillis > 5000) { // change art every 5s
    mode = (mode + 1) % 4;
    lastMillis = millis();
    matrix.fillScreen(0);
  }

  switch(mode) {
    case 0: gradientStripes(); break;
    case 1: checkerboard(); break;
    case 2: rainbowDiagonal(); break;
    case 3: scrollingText(); break;
  }

  matrix.show();
}

// --- Art Modes ---
void gradientStripes() {
  for (int x=0; x<32; x++) {
    uint16_t color = matrix.Color(x*8, 255-x*8, (x*4)%255);
    for (int y=0; y<8; y++) {
      matrix.drawPixel(x,y,color);
    }
  }
}

void checkerboard() {
  for (int x=0; x<32; x++) {
    for (int y=0; y<8; y++) {
      if ((x+y)%2==0) matrix.drawPixel(x,y,matrix.Color(255,0,0));
      else matrix.drawPixel(x,y,matrix.Color(0,0,255));
    }
  }
}

void rainbowDiagonal() {
  for (int x=0; x<32; x++) {
    for (int y=0; y<8; y++) {
      uint16_t color = matrix.Color((x*8)%255,(y*32)%255,((x+y)*16)%255);
      matrix.drawPixel(x,y,color);
    }
  }
}

void scrollingText() {
  static int x=32;
  matrix.setTextColor(matrix.Color(0,255,255));
  matrix.setCursor(x,1);
  matrix.print("AI Centre");
  x--;
  if (x<-60) x=32;
}