// Two WS2812
// https://forum.arduino.cc/t/how-would-i-safely-connect-2-sets-of-2-3-leds-to-a-nano-without-using-an-external-power-source/1446334/43

#include <FastLED.h> // https://github.com/FastLED/FastLED
#define PIX 2  // number of WS2812
#define PIN 6   // data pin
CRGB led[PIX]; // FastLED object (led[])
#define maximum 255 // set maximum brightness for each LED (0 - 255)

bool i, state;
int buttonPin = 2, count, fullcount = 1;
unsigned long timer, timeout = 5000;

void setup() {
  pinMode(buttonPin, INPUT_PULLUP); // LOW when PRESSED, HIGH when RELEASED
  FastLED.addLeds<WS2812, PIN, GRB>(led, PIX);
  FastLED.clear();
  FastLED.setBrightness(maximum);
  FastLED.show();

  while (digitalRead(buttonPin) == HIGH) {}; // do nothing until button pressed
}

void loop() {
  if (millis() - timer > timeout) {
    timer = millis();
    if (count++ == fullcount)
      count = 0;
    FastLED.clear();
    FastLED.show();
  }
  count = 0;
  switch (count) {
    case 0: blend(); break;
    default: break;
  }
}

void blend() {
  for (int i = 0; i < 256; i++) {
    led[0] = CRGB(i, i, 255); // increase from blu to wht
    led[1] = CRGB(255 - i, 255 - i, 255); // decrease from wht to blu
    FastLED.show();
    delay(10);
  }
  for (int i = 0; i < 256; i++) {
    led[0] = CRGB(255 - i, 255 - i, 255);
    led[1] = CRGB(i, i, 255);
    FastLED.show();
    delay(10);
  }
}

void onetwo() {
  led[0] = CRGB::White;
  FastLED.show();
  delay(2000);
  led[0] = CRGB::Blue;
  FastLED.show();
  delay(2000);
}

void flicker() {
  led[0] = CRGB::Red;
  FastLED.show();
  delay(50);
  led[0] = CRGB::Green;
  FastLED.show();
  delay(75);
}

void blinkblonk() {
  if (i)
    led[0] = CRGB(0, 0, 255);
  else
    led[0] = CRGB(255, 255, 255);
  FastLED.show();
  delay(500);
  led[0] = CRGB(0, 0, 0);
  FastLED.show();
  delay(500);
  i = !i;
}

void wigwag(int r1, int g1, int b1, int r2, int g2, int b2) {
  int myDelay = 1000;
  if (state) {
    led[0] = CRGB(r1, g1, b1);
    FastLED.show();
    delay(50);
    led[0] = CRGB(r2, g2, b2);
    FastLED.show();
    delay(50);
    led[0] = CRGB(r1, g1, b1);
    FastLED.show();
    delay(500);
  } else {
    led[0] = CRGB(r2, g2, b2);
    FastLED.show();
    delay(50);
    led[0] = CRGB(r1, g1, b1);
    FastLED.show();
    delay(50);
    led[0] = CRGB(r2, g2, b2);
    FastLED.show();
    delay(500);
  }
  state = !state;
  delay(myDelay);
}

void ramp() {
  int myDelay = 10; // 10ms = 4sec
  for (int j = 0; j < 2; j++) {
    for (int i = 0; i < 256; i++) {
      if (j)
        led[0] = CRGB(i, i, i); // white
      else
        led[0] = CRGB(0, 0, i); // blue
      FastLED.show();
      delay(myDelay);
    }
  }
}

void updown() {
  int myDelay = 10; // 10ms = 10sec
  for (int j = 0; j < 2; j++) {
    for (int i = 0; i < 256; i++) {
      if (j)
        led[0] = CRGB(i, i, i); // white
      else
        led[0] = CRGB(0, 0, i); // blue
      FastLED.show();
      delay(myDelay);
    }
    for (int i = 0; i < 256; i++) {
      if (j)
        led[0] = CRGB(255 - i, 255 - i, 255 - i); // white
      else
        led[0] = CRGB(0, 0, 255 - i); // blue
      FastLED.show();
    }
    delay(myDelay);
  }
}