#include <Adafruit_NeoPixel.h>

#define BUTTON_PIN   2
#define PIXEL_PIN    3
#define PIXEL_COUNT 60

Adafruit_NeoPixel strip(PIXEL_COUNT, PIXEL_PIN, NEO_GRB + NEO_KHZ800);

boolean oldState = HIGH;
int     mode     = 0;

void setup() {
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  strip.begin();
  strip.show();
}

void loop() {
  boolean newState = digitalRead(BUTTON_PIN);

  if((newState == LOW) && (oldState == HIGH)) {
    delay(20);
    newState = digitalRead(BUTTON_PIN);
    if(newState == LOW) {
      if(++mode > 8) mode = 0;
      switch(mode) {
        case 0:
          colorWipe(strip.Color(  0,   0,   0), 50);    // Black/off
          break;
        case 1:
          colorWipe(strip.Color(255,   0,   0), 50);    // Red
          break;
        case 2:
          colorWipe(strip.Color(  0, 255,   0), 50);    // Green
          break;
        case 3:
          colorWipe(strip.Color(  0,   0, 255), 50);    // Blue
          break;
        case 4:
          theaterChase(strip.Color(127, 127, 127), 50); // White
          break;
        case 5:
          theaterChase(strip.Color(127,   0,   0), 50); // Red
          break;
        case 6:
          theaterChase(strip.Color(  0,   0, 127), 50); // Blue
          break;
        case 7:
          rainbow(10);
          break;
        case 8:
          theaterChaseRainbow(50);
          break;
      }
    }
  }
  oldState = newState;

  uint32_t color = strip.Color(255, 255, 0); // Keltainen
  for(int i = 0; i < strip.numPixels(); i++) {
    strip.setPixelColor(i, color);
  }
  strip.show();
  delay(2000); // Pidetään keltainen väri 2 sekuntia
  rainbow(10);
  delay(2000); // Pidetään sateenkaari 2 sekuntia
  theaterChaseRainbow(50);
  delay(2000); // Pidetään teatterin metsästys sateenkaari 2 sekuntia
}

void colorWipe(uint32_t color, int wait) {
  for(int i=0; i<strip.numPixels(); i++) {
    strip.setPixelColor(i, color);
    strip.show();
    delay(wait);
  }
}

void theaterChase(uint32_t color, int wait) {
  for(int a=0; a<10; a++) {
    for(int b=0; b<3; b++) {
      strip.clear();
      for(int c=b; c<strip.numPixels(); c += 3) {
        strip.setPixelColor(c, color);
      }
      strip.show();
      delay(wait);
    }
  }
}

void rainbow(int wait) {
  for(long firstPixelHue = 0; firstPixelHue < 3*65536; firstPixelHue += 256) {
    for(int i=0; i<strip.numPixels(); i++) {
      int pixelHue = firstPixelHue + (i * 65536L / strip.numPixels());
      strip.setPixelColor(i, strip.gamma32(strip.ColorHSV(pixelHue)));
    }
    strip.show();
    delay(wait);
  }
}

void theaterChaseRainbow(int wait) {
  int firstPixelHue = 0;
  for(int a=0; a<30; a++) {
    for(int b=0; b<3; b++) {
      strip.clear();
      for(int c=b; c<strip.numPixels(); c += 3) {
        int      hue   = firstPixelHue + c * 65536L / strip.numPixels();
        uint32_t color = strip.gamma32(strip.ColorHSV(hue));
        strip.setPixelColor(c, color);
      }
      strip.show();
      delay(wait);
      firstPixelHue += 65536 / 90;
    }
  }
}