#include <FastLED.h>

#define LED_PIN 3
#define NUM_LEDS 12

CRGB leds[NUM_LEDS];

const int swt = 5;
byte r,g,b;

int btn = 0;

void setup() {
  pinMode(swt, INPUT);
  delay(500);
  led_init();
  opening();
  delay(500);
  led_clear();
  delay(500);
}

void loop() {

  btn = digitalRead(swt);

  if (btn == HIGH) {
    running();
  } else {
    rainbow();
  }

  // opening();
  // delay(500);
  // runningClear();

  // switch (btn) {
  //   case 1:
  //     sein();
  //     break;
  //   case 2:
  //     rainbow();
  //     break;
  //   case 3:
  //     running();
  //     break;
  // }
}

void led_init() {
  FastLED.addLeds<NEOPIXEL, LED_PIN>(leds, NUM_LEDS);
  FastLED.setBrightness(255);
}

void led_clear() {
  for (int i = 0; i < NUM_LEDS; i++) {
    leds[i] = CRGB::Black;
  }
}

void test_color() {
  for (int i = 0; i < NUM_LEDS;i++) {
    // leds[i] = CHSV(135, 255, 255);
    leds[i] = CRGB::Red;
  }
  FastLED.show();
}

void test_animation() {
  int j;
  for (int i = 0; i < (NUM_LEDS + 2); i++) {
    j = i;
    leds[j] = CHSV(136, 255, 255);
    leds[j-1] = CHSV(136, 255, 255);
    leds[j-2] = CHSV(136, 255, 255);
    FastLED.show();
    delay(2.5);
    leds[i] = CHSV(0, 0, 35);
    leds[j-1] = CHSV(0, 0, 35);
    leds[j-2] = CHSV(0, 0, 35);
  }
  for (int i = NUM_LEDS; i > -4; i--) {
    j = i;
    leds[j] = CHSV(136, 255, 255);
    leds[j+1] = CHSV(136, 255, 255);
    leds[j+2] = CHSV(136, 255, 255);
    FastLED.show();
    delay(2.5);
    leds[j] = CHSV(0, 0, 35);
    leds[j+1] = CHSV(0, 0, 35);
    leds[j+2] = CHSV(0, 0, 35);
  }
}

void opening() {
  int j;
  for (int i = 0; i < NUM_LEDS; i++) {
    j = i;
    leds[j] = leds[j-1] = leds[j-2] = CRGB(1, 106, 250);
    // leds[j] = leds[j-1] = leds[j-2] = CHSV(140, 255, 255);
    FastLED.show();
    delay(30);
    leds[j] = leds[j-1] = leds[j-2] = CRGB(0, 0, 0);
  }
  for (int i = NUM_LEDS; i > -4; i--) {
    j = i;
    leds[j] = leds[j+1] = leds[j+2] = CRGB(1, 106, 250);
    FastLED.show();
    delay(30);
    leds[j] = leds[j+1] = leds[j+2] = CRGB(0, 0, 0);
  }
  for (int i = 0; i < NUM_LEDS; i++) {
    leds[i] = CRGB(1, 106, 250);
    FastLED.show();
    delay(30);
  }
}

void rainbow() {
  rainbowColor();
}

void rainbowColor() {
  static uint8_t hue = 360;
  for (int i = 0; i < NUM_LEDS; i++) {
    leds[i] = CHSV(hue - i, 255, 255);
  }
  FastLED.show();
  delay(5);
  hue++;
}

void running() {
  runningFill();
  delay(5);
  runningClear();
  delay(5);
}

void runningFill() {
  for (int i = 0; i < NUM_LEDS; i++) {
    leds[i] = CRGB(0, 0, 255);
    FastLED.show();
  }
}
void runningClear() {
  for (int i = 0; i < NUM_LEDS; i++) {
    leds[i] = CRGB(0, 0, 0);
    FastLED.show();
  }
}

void sein() {
  seinFill();
  delay(5);
  seinClear();
  delay(5);
}

void seinFill() {
  for (int i = 0; i < NUM_LEDS; i++) {
    leds[i] = CRGB(52, 11, 0);
    FastLED.show();
  }
}
void seinClear() {
  for (int i = 0; i < NUM_LEDS; i++) {
    leds[i] = CRGB(0, 0, 0);
    FastLED.show();
    // delay(30);
  }
}