#include <FastLED.h>

// LED stuff
#define DATA_PIN            3
#define NUM_LEDS            16   // will be 500
#define MAX_POWER_MILLIAMPS 6000
#define LED_TYPE            WS2812B
#define COLOR_ORDER         GRB

CRGB leds[NUM_LEDS];

//buttons
const int buttonHappy = 7;
const int buttonSoso = 6; 
const int buttonSad = 5; 

//variable for start number, originally set to 0
int startNumber = 0;

const int chunkSize = 3;    // will be 20



void setup() {
  Serial.begin(9600);
  Serial.println("begin");
  // 3 second delay for boot recovery, and a moment of silence
  delay(1000); 

  //buttons
  pinMode(buttonHappy,INPUT_PULLUP);
  pinMode(buttonSoso,INPUT_PULLUP);
  pinMode(buttonSad,INPUT_PULLUP);

  FastLED.addLeds<LED_TYPE,DATA_PIN,COLOR_ORDER>(leds, NUM_LEDS).setCorrection( TypicalLEDStrip );
  
  FastLED.setMaxPowerInVoltsAndMilliamps( 5, MAX_POWER_MILLIAMPS);
  
  FastLED.setBrightness(255);  
  
  FastLED.clear();
  delay(1000);
  FastLED.show();
  
  
  // initial color fill:
  for (int i = 0; i < NUM_LEDS; i++) 
  {
    leds[i] = CRGB::Seashell;
    //leds[i] = CHSV(160,80,100);
  }
  FastLED.show();
  

  
}


void loop() {
  
  //if message is happy
  if (digitalRead (buttonHappy) == LOW) 
  { 
    Serial.println("happy...");
    moveLEDS (CRGB::Magenta);
  }
  
  //if message is soso
  else if (digitalRead (buttonSoso) == LOW) 
  {
    Serial.println("so so...");
    moveLEDS (CRGB::Orange);
  }
  
  //if message is sad
  else if (digitalRead (buttonSad) == LOW) 
  {
    Serial.println("sad...");
    moveLEDS (CRGB::Red);
  }
}


void moveLEDS (CRGB colour) {
  for (int i=0; i<chunkSize; i++) {
    Serial.print("chunk LED ");
    Serial.println(i);
    
    // move all LEDs over one, except the first pixel 
    for (int j=NUM_LEDS-1; j>=1; j--) {
      //Serial.println(j);
      leds[j] = leds[j-1];
    }
    // set first pixel to new emotion:
    leds[0] = colour;
    FastLED.show();
    
    delay(50); // TEMPORARY DELAY TO SEE WHAT IS HAPPENING
  }
}