#include <FastLED.h>     // include the FastLED library code

#define DATA_PIN     2
#define NUM_LEDS    50
#define MAX_BRIGHTNESS 255
#define BRIGHTNESS  255   // To make the LED brighter set BRIGHTNESS to 255
#define LED_TYPE    WS2811

CRGB leds[NUM_LEDS];


// runs once when program starts
void setup()     {
  Serial.begin(9600); //enables serial output for debugging
  // initialize WS2811
  FastLED.addLeds<LED_TYPE, DATA_PIN, RGB>(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);
  FastLED.setBrightness(BRIGHTNESS);
}

// declare the 4 arrays for the 7 top, 7 bottom, 7 left most, and 7 right most LEDs
int bottom_LEDS[7] = {42, 43, 44, 45, 46, 47, 48};
int top_LEDS[7] = {0, 1, 2, 3, 4, 5, 6};
int left_LEDS[7] = {0, 13, 14, 27, 28, 41, 42};
int right_LEDS[7] = {6, 7, 20, 21, 34, 35, 48};

//declare the 4 colors
CRGB colorRed = CRGB::Red;
CRGB colorGreen = CRGB::Green;
CRGB colorBlue = CRGB::Blue;
CRGB colorBlack = CRGB::Black;

void func1(int seq[], CRGB color1, CRGB color2, int dly){
  for (int x=0; x < 7; x++){
    leds[seq[x]] = color1;
    leds[seq[x-1]] = color2;
    FastLED.delay(dly);}
  leds[seq[-1]] = color2;
}

void func2(int seq[], int from, int to, CRGB color1, CRGB color2, int dly){
  for (int x= from ; x < to; x++){
    leds[seq[x]] = color1;
    leds[seq[x-1]] = color2;
    FastLED.delay(dly);}
  leds[seq[to]] = color2;
}

void func3(int seq[], int from, int to, CRGB color1, CRGB color2, int dly){
  if (from > to){
    for (int x= from ; x < to; x--){
      leds[seq[x]] = color1;
      leds[seq[x-1]] = color2;
      FastLED.delay(dly);}
  leds[seq[from]] = color2;
  }
  else {
    for (int x= from ; x < to; x++){
    leds[seq[x]] = color1;
    leds[seq[x-1]] = color2;
    FastLED.delay(dly);}
  leds[seq[to]] = color2;
  }
}

void loop() {
  for (int x = 0; x < 7; x++){
    leds[x] = colorRed;
    leds[x-1] =colorBlack;
    FastLED.delay(200);}
    leds[6]=colorBlack;

  // the loop to turn on each of the 7 LEDs on the TOP (GREEN)
  // call func1() to light up the 7 LEDs on the TOP (GREEN)
  func1(top_LEDS, colorRed, colorBlack, 200);
  
  func2(right_LEDS, 0, 7, colorRed, colorBlack, 200);
  func2(top_LEDS, 0, 7, colorGreen, colorBlack, 200);
  func2(right_LEDS, 0, 7, colorGreen, colorBlack, 200);
  func3(top_LEDS, 0, 7, colorBlue, colorBlack, 200);
  func3(right_LEDS, 0, 7, colorBlue, colorBlack, 200);
  func3(bottom_LEDS, 7, 0, colorBlue, colorBlack, 200);
  func3(left_LEDS, 7, 0, colorBlue, colorBlack, 200);
  }
  
  // call func1() to light up the 7 LEDs on the RIGHT (GREEN)

  // call func2() twice to light up the 13 LEDs on TOP & RIGHT without lighting up top right corner twice (RED)

  // call func3() four times to light up all the LEDs on the edge one after the other (BLUE)

  // call func4() four times (should behave exactly like the 4 func3() calls above) (GREEN)

  // call func4() four times lighting up each of the four sides at the same time (GREEN)

  // use func4() with dly=0 to light up all four sides in all 3 different colors (RED, BLUE, GREEN)

  // use func4() to light up LEDs one at a time, but skipping the corners  (GREEN)