#include "FastLED.h"

#define DATA_PIN 2
#define COLOR_ORDER GRB
#define NUM_LEDS 16
#define LED_TYPE WS2812B
#define MAXBRIGHTNESS 150
#define SPEED 10
#define ROWS 7
#define COLUMNS 3
#define RAINBOWLENGTH 23
CRGB leds[NUM_LEDS];

uint8_t randomsequence[][NUM_LEDS] = {{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}, {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}};

uint8_t rows[ROWS][COLUMNS] = {{15, 0, 1}, {14, 2}, {13, 3}, {12, 4}, {11, 5}, {10, 6}, {9, 8, 7}};

long colorpalette[] = {
  0xFF0000,
  0xFF4D00,
  0xFF6F00,
  0xFF9500,
  0xFFBB00,
  0xFFE100,
  0xF7FF00,
  0xD0FF00,
  0xAEFF00,
  0x88FF00,
  0x00FF11,
  0x00FF80,
  0x00FFA6,
  0x00FFCC,
  0x00FFEE,
  0x00EAFF,
  0x00C4FF,
  0x0051FF,
  0x1E00FF,
  0x9100FF,
  0xB300FF,
  0xD900FF,
  0xFF00FF,
  CRGB::White,
  CRGB::Aqua,
  CRGB::DarkOliveGreen,
  CRGB::Teal,
  CRGB::Navy,
  CRGB::Fuchsia,
  CRGB::Purple,
  CRGB::Green,
  CRGB::Gray,
  CRGB::DeepPink,
  CRGB::HotPink,
  CRGB::SeaGreen,
  CRGB::Pink,
  CRGB::SeaGreen,
  CRGB::MediumSpringGreen,
  CRGB::GreenYellow,
  CRGB::DarkGreen,
  CRGB::Cyan,
  CRGB::Gold,
  CRGB::Chocolate,
  CRGB::SandyBrown,
  CRGB::Purple,
  CRGB::ForestGreen,
  CRGB::Magenta,
  CRGB::Violet,
  CRGB::SlateGray,
  CRGB::Orange,
  CRGB::AliceBlue,
  CRGB::Maroon,
  CRGB::Brown,
  CRGB::LawnGreen
};

void setup() {
  FastLED.addLeds<LED_TYPE, DATA_PIN, COLOR_ORDER>(leds, NUM_LEDS);
  FastLED.setCorrection(TypicalLEDStrip);
  FastLED.clear();
}

void loop() {
  //fadecolor();

  colorrain();
}

void colorrain() {
  FastLED.clear();
  FastLED.setBrightness(MAXBRIGHTNESS);
  long color = colorpalette[micros() % (sizeof(colorpalette) / sizeof(colorpalette[0]))];
  uint8_t sequence = millis() % 1;
  for (uint8_t led = 0; led < NUM_LEDS; led++) {
    for (uint8_t brightness = 0; brightness < MAXBRIGHTNESS; brightness = brightness + 10) {
      leds[randomsequence[sequence][led]] = color;
      FastLED.setBrightness(brightness);
      FastLED.show();
      delay(SPEED + 5);
    }
    for (uint8_t brightness = MAXBRIGHTNESS; brightness > 0; brightness = brightness - 10) {
      leds[randomsequence[sequence][led]] = color;
      FastLED.setBrightness(brightness);
      FastLED.show();
      delay(SPEED + 5);
    }
    leds[randomsequence[sequence][led]] = CRGB::Black;
    delay(SPEED * 2);
  }
  FastLED.clear();
}