#include<Wire.h>    
#include <FastLED.h>
#define NUM_LEDS 16 
#define DATA_PIN 6

CRGB leds[NUM_LEDS];

int coler[16];
int s = 255;
int v = 120;
int starCol = 230;

byte SlaveReceived = 0;


void setup() {
  
  FastLED.addLeds<WS2811, DATA_PIN, RGB>(leds, NUM_LEDS);
  startLED(50);
  setAll(starCol);
  Serial.begin(9600);
  
  Wire.begin(8);  
  Wire.onReceive(receiveEvent);
}


int readA0 = 0;
int readA1 = 0;
int readA2 = 0;
int readA3 = 0;


void loop() {  
  show0();
  for( int i = 0; i < NUM_LEDS; i++) {
    leds[i] = CHSV((coler[i]), (s), (v));
    FastLED.show();  
  }

}



void receiveEvent (int howMany){
  Serial.print("a0: ");  
  int x0 = Wire.read();   
  Serial.println(x0);     
  readA0 = x0; 
     
  Serial.print("a1: ");  
  int x1 = Wire.read();   
  Serial.println(x1);     
  readA1 = x1;  
  
  Serial.print("a2: ");  
  int x2 = Wire.read();   
  Serial.println(x2);     
  readA2 = x2; 
   
  int x3 = Wire.read(); 
  Serial.print("a3: ");  
  Serial.println(x3);     
  readA3 = x3;      
}
  
void startLED(int t){
  //start
  for( int i = 0; i < NUM_LEDS; i++) {
    int col = 220 + i*15;
    leds[i] = CHSV((col), (s), (v));
    FastLED.show();
    delay(t);     
  }
  for( int i = 0; i < NUM_LEDS; i++) {
    int col = 220 + i*15;
    leds[i] = CRGB::Black;
    FastLED.show();
    delay(t);     
 }
}

void setAll(int t){


  for( int i = 0; i < NUM_LEDS; i++) {
        coler[i] =t;
        leds[i] = CHSV((coler[i]), (s), (v));
        FastLED.show();    
 }
}

void show0(){
  coler[0]  = starCol + readA3-20 + readA2-20;
  coler[1]  = starCol + readA2-10;
  coler[2]  = starCol + readA2;
  coler[3]  = starCol + readA2-10;
  coler[4]  = starCol + readA1-20 + readA2-20;
  coler[5]  = starCol + readA1-10 ;
  coler[6]  = starCol + readA1;
  coler[7]  = starCol + readA1-10 ;
  coler[8]  = starCol + readA1-20 + readA0-20;
  coler[9]  = starCol + readA0-10;
  coler[10] = starCol + readA0;
  coler[11] = starCol + readA0-10;
  coler[12] = starCol + readA3-20 + readA0-20;
  coler[13] = starCol + readA3-10 ;
  coler[14] = starCol + readA3;
  coler[15] = starCol + readA3-10;
  
}

int getNR(int nr){
  int erg = nr;  
  if(nr > 15){
    erg =  nr -15;
    } 
  return erg;
}