#include "FastLED.h"

#define NUM_LEDS 300
CRGB leds[NUM_LEDS];
#define PIN 3
#define BRIGHTNESS  200

int8_t inc = 0;

DEFINE_GRADIENT_PALETTE(RainPal) {
  0,   182, 203, 238,
  64,  165, 190, 231,
  128, 142, 174, 227,
  192, 128, 160, 214,
  255, 104, 142, 206
};
DEFINE_GRADIENT_PALETTE(SnowPal) {
  0,    207, 246, 251,
  13,   214, 239, 254,
  38,   189, 222, 255,
  69,   201, 215, 255,
  102,  197, 203, 253,
  140,  177, 190, 255,
  179,  188, 197, 246,
  204,  189, 222, 255,
  230,  214, 239, 254,
  255,  207, 246, 251
};
CRGBPalette16 palette_rain = RainPal;
CRGBPalette16 palette_snow = SnowPal;

void setup()
{
  delay(1000); // 1 second delay for recovery

  FastLED.addLeds<WS2813, PIN, GRB>(leds, NUM_LEDS); //.setCorrection( TypicalSMD5050 ); // tell FastLED about the LED strip configuration
  FastLED.setBrightness(BRIGHTNESS); // set master brightness control

  // fill_solid(leds, NUM_LEDS, CRGB::Blue);
}

void loop() {
  //Rain(50);
  Snow();
  FastLED.show();
}

void Rain(int intensity) {
  EVERY_N_MILLISECONDS(intensity) {
    leds[random16(0, NUM_LEDS - 1)] = ColorFromPalette(palette_rain, random8(0, 255));
  }
  fadeToBlackBy(leds, NUM_LEDS, 1);
}

void Snow() {
    EVERY_N_MILLISECONDS(100){
    leds[0] = ColorFromPalette(palette_snow, inc, BRIGHTNESS);

    for (int i = NUM_LEDS-1; i > 0; i--) {
      leds[i] = leds[i-1];
    }
    inc++;
    }
}