//Qinxinrui Zhu. NeoPixel Assignment. Nov.12.2019.//
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h> // Required for 16 MHz Adafruit Trinket
#endif

#define LED_PIN    6 // connect to NeoPixels
#define LED_COUNT 40 // How many Pixels
#define BUTTON_PIN   2 // connect to button

boolean oldState = HIGH;
int     mode     = 0;//animation mode, 0-9

Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);
// Argument 1 = Number of pixels in NeoPixel strip
// Argument 2 = Arduino pin number (most are valid)
// Argument 3 = Pixel type flags, add together as needed:
//   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
//   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
//   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
//   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
//   NEO_RGBW    Pixels are wired for RGBW bitstream (NeoPixel RGBW products)

void setup() {
  pinMode(BUTTON_PIN, INPUT_PULLUP);
#if defined(__AVR_ATtiny85__) && (F_CPU == 16000000)
  clock_prescale_set(clock_div_1);
#endif
  strip.begin();//Initializing the neopxel strip object
  strip.show();// Initialize all pixels to 'off'
}



void loop() {
  ////Gets the current button status.
  boolean newState = digitalRead(BUTTON_PIN);
  if ((newState == LOW) && (oldState == HIGH)) {
    // Short delay to debounce button.
    delay(30);
    // Check if the button is still low after debounce.
    newState = digitalRead(BUTTON_PIN);
    if (newState == LOW) {
      if (++mode > 5) mode = 0;
      switch (mode) {
        case 1:
          ////Fill with various colors along the strip
          colorWipe(strip.Color(30, 144, 255), 40);
          break;//DodgerBlue
          case 2 :
          colorWipe(strip.Color(255, 127, 80), 10);//Coral
          break;
          case 3:
          colorWipe(strip.Color(0, 255, 0), 50);//Lime
          break;

      }

    }

  }
//Set the last read button state to the old state.
  oldState = newState;
}
//Created animatied effect
void colorWipe(uint32_t color, int wait) {
  for (int i = 0; i < strip.numPixels(); i++) {
    strip.setPixelColor(i, color);
    strip.show();
    delay(20);
  }
}