/*
   8x8 NeoPixel Matrix Demo
   Arduino Nano + WS2812B 64 LED Matrix

   Library Required:
   Adafruit NeoPixel
*/

#include <Adafruit_NeoPixel.h>

#define LED_PIN   D10        // Data pin to matrix
#define LED_COUNT 64       // 8x8 = 64 pixels

Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);

uint8_t mode = 0;
unsigned long lastChange = 0;
const unsigned long demoTime = 5000; // 5 seconds per effect

// =======================================================

void setup() {
  strip.begin();
  strip.setBrightness(180);
  strip.show();
}

// =======================================================

void loop() {

  switch (mode) {
    case 0: rainbowFill(); break;
    case 1: colorWaves(); break;
    case 2: breatheEffect(); break;
    case 3: meteorRain(); break;
    case 4: theaterChaseRainbow(); break;
    case 5: sparkleEffect(); break;
  }

  if (millis() - lastChange > demoTime) {
    lastChange = millis();
    mode++;
    if (mode > 5) mode = 0;
    strip.clear();
    strip.show();
  }
}

// =======================================================
// Rainbow Fill (all pixels active)
// =======================================================

void rainbowFill() {
  static uint16_t j = 0;

  for (int i = 0; i < LED_COUNT; i++) {
    strip.setPixelColor(i, Wheel((i * 256 / LED_COUNT + j) & 255));
  }

  strip.show();
  j++;
  delay(20);
}

// =======================================================
// Color Waves across matrix
// =======================================================

void colorWaves() {
  static int pos = 0;

  strip.clear();

  for (int t = 0; t < 8; t++) {
    int idx = (pos - t + LED_COUNT) % LED_COUNT;
    uint8_t b = 255 - t * 30;
    strip.setPixelColor(idx, strip.Color(0, b, 255));
  }

  strip.show();

  pos++;
  if (pos >= LED_COUNT) pos = 0;

  delay(60);
}

// =======================================================
// Breathing Effect (whole matrix)
// =======================================================

void breatheEffect() {
  for (int b = 10; b < 255; b += 5) {
    strip.fill(strip.Color(b, 0, b));
    strip.show();
    delay(15);
  }
  for (int b = 255; b > 10; b -= 5) {
    strip.fill(strip.Color(b, 0, b));
    strip.show();
    delay(15);
  }
}

// =======================================================
// Meteor Rain across matrix
// =======================================================

void meteorRain() {
  static int pos = 0;

  for (int i = 0; i < LED_COUNT; i++) {
    uint32_t c = strip.getPixelColor(i);
    uint8_t r = (c >> 16) & 0xFF;
    uint8_t g = (c >> 8) & 0xFF;
    uint8_t b = c & 0xFF;
    r = r > 20 ? r - 20 : 0;
    g = g > 20 ? g - 20 : 0;
    b = b > 20 ? b - 20 : 0;
    strip.setPixelColor(i, r, g, b);
  }

  strip.setPixelColor(pos, 255, 180, 80);
  strip.show();

  pos++;
  if (pos >= LED_COUNT) pos = 0;

  delay(40);
}

// =======================================================
// Theater Chase Rainbow
// =======================================================

void theaterChaseRainbow() {
  static int step = 0;
  strip.clear();

  for (int i = 0; i < LED_COUNT; i++) {
    if ((i + step) % 3 == 0) {
      strip.setPixelColor(i, Wheel((i * 10 + step * 10) & 255));
    }
  }

  strip.show();
  step++;
  delay(80);
}

// =======================================================
// Sparkle Effect
// =======================================================

void sparkleEffect() {
  for (int i = 0; i < LED_COUNT; i++) {
    uint32_t c = strip.getPixelColor(i);
    uint8_t r = (c >> 16) & 0xFF;
    uint8_t g = (c >> 8) & 0xFF;
    uint8_t b = c & 0xFF;
    r = r > 30 ? r - 30 : 0;
    g = g > 30 ? g - 30 : 0;
    b = b > 30 ? b - 30 : 0;
    strip.setPixelColor(i, r, g, b);
  }

  int pixel = random(LED_COUNT);
  strip.setPixelColor(pixel, random(256), random(256), random(256));
  strip.show();
  delay(50);
}

// =======================================================
// Color Wheel
// =======================================================

uint32_t Wheel(byte WheelPos) {
  WheelPos = 255 - WheelPos;
  if (WheelPos < 85) {
    return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
  }
  if (WheelPos < 170) {
    WheelPos -= 85;
    return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
  }
  WheelPos -= 170;
  return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
}