#include <Adafruit_NeoPixel.h>

#define PIXEL_PIN 1
#define PIXEL_COUNT 24

Adafruit_NeoPixel strip = Adafruit_NeoPixel (PIXEL_COUNT, PIXEL_PIN, NEO_GRB + NEO_KHZ800);

const int LeftTurnInput = 2;
const int RightTurnInput = 5;
const int StandbyInput = 3;
const int BrakeInput = 4;
const int LED = 9;

void setup() {
  pinMode(LED, OUTPUT); 
  pinMode(LeftTurnInput, INPUT);  
  pinMode(RightTurnInput, INPUT);
  pinMode(StandbyInput, INPUT);
  pinMode(BrakeInput, INPUT);
  strip.begin();
  strip.show();
  Serial.begin(9600);
}

void loop() {
  
  strip.clear();
  byte leftTurnState  = (digitalRead(LeftTurnInput) == HIGH)  ? 1 : 0;
  byte rightTurnState = (digitalRead(RightTurnInput) == HIGH) ? 2 : 0;
  byte standbyState   = (digitalRead(StandbyInput) == HIGH)   ? 4 : 0;
  byte brakeState     = (digitalRead(BrakeInput) == HIGH)     ? 8 : 0;

  byte globalState = brakeState | standbyState |  rightTurnState | leftTurnState; // 4 bits of a byte

  switch (globalState) {
    case 0b0000:  // none
      for(int i=0; i<24; i++) {
		strip.setPixelColor(i, strip.Color(0, 0, 0));
		strip.show();
  		}
      break;

    case 0b0001:  // only leftTurnState
        leftturn();
      break;

    case 0b0010: // only rightTurnState
		rightturn();
      break;  

    case 0b0011: // both rightTurnState and leftTurnState
		rightturn();
    	delay(0);
		leftturn();
      break;  
    
  	}
}

void leftturn(){
	for(int i=7;i>-1;i--) {
		strip.setPixelColor(i, strip.Color(250, 75, 0));
		strip.show();
		delay(50);
      	}
    for(int i=7;i>-1;i--) {
		strip.setPixelColor(i, strip.Color(0, 0, 0));
		strip.show();
		delay(0);
      	}
}

void rightturn(){
      for(int i=16;i<24;i++) {
		strip.setPixelColor(i, strip.Color(250, 75, 0));
		strip.show();
		delay(50);
      	}
      for(int i=16;i<24;i++) {
		strip.setPixelColor(i, strip.Color(0, 0, 0));
		strip.show();
		delay(0);
      	}
}