//Modern turn lights v.6.0.0 with arduino or attiny85 and ws2812b - individual strips easy to embed - tail lights - by Fedaceag Ionut ( Youtube - Think small, build big! )
#include <FastLED.h>                        //FastLed library version 3.2.1 - https://github.com/FastLED/FastLED/wiki/Overview or http://fastled.io/ with NEOPIXEL or WS2812B
#define NUM_STRIPS 1                        // number of led strips
#define NUM_LEDS_PER_STRIP 20               // number of leds per each strip !!! If changed don't forget to modified the patterns for tail, fog and reverse !!!
CRGB leds[NUM_STRIPS][NUM_LEDS_PER_STRIP];

//input pins for arduino
const int buttonPinBreak = 6;              // brake lights for arduino
const int buttonPinTailLights = 7;         // tail lights for arduino
const int buttonPinReverseLights = 2;      // reverse lights for arduino
const int buttonPinRearFogLights = 3;      // rear fog lights for arduino

//input pins for attiny85
//const int buttonPinBreak = 1;              // brake lights for attiny85
//const int buttonPinTailLights = 2;         // tail lights for attiny85
//const int buttonPinReverseLights = 3;      // reverse lights for attiny85
//const int buttonPinRearFogLights = 4;      // rear fog lights for attiny85

int Break = 0;
int TailLights = 0;
int ReverseLights = 0;
int RearFogLights = 0;

int TailState = 0;
int ReverseState = 0;
int FogState = 0;
int BrakeState = 0;

int delayTail = 15;                                            // delay for tail lights on/off
int maxBrtBreak = 254;                                         // maxim brightness Break lights - from 0 to 254
int maxBrtTailLights = 80;                                     // maxim brightness tail lights - from 0 to 254
int maxBrtReverseLights = 254;                                 // maxim brightness reverse lights - from 0 to 254
int maxBrtRearFogLights = 254;                                 // maxim brightness rear fog lights - from 0 to 254
int tailLightModel[] = {0,1,2,3,7,8,9,10,11,12,16,17,18,19};   // model array for tail lights leds from 0 - 19
int reverseLightModel[] = {7,8,9,10,11,12};                    // model array for reverse lights leds from 0 - 19 for 20 leds
int rearFogLightsModel[] = {0,1,2,3,4};                        // model array for rear fog lights leds from 0 - 19 for 20 leds

void setup() { 
  //Serial.begin(9600);
  pinMode(buttonPinBreak, INPUT);
  pinMode(buttonPinTailLights, INPUT);
  pinMode(buttonPinReverseLights, INPUT);
  pinMode(buttonPinRearFogLights, INPUT);
  
  FastLED.addLeds<NEOPIXEL, 13>(leds[0], NUM_LEDS_PER_STRIP); //led strip front left for arduino
  //FastLED.addLeds<NEOPIXEL, 0>(leds[0], NUM_LEDS_PER_STRIP); //led strip front left for attiny85
  
  fill_solid(leds[0], NUM_LEDS_PER_STRIP, CRGB::Black); // some led strips are all on at power on, so let's power them off at boot
  FastLED.show();
}

void loop() {
    // read the input state
    Break = digitalRead(buttonPinBreak);
    TailLights = digitalRead(buttonPinTailLights);
    ReverseLights = digitalRead(buttonPinReverseLights);
    RearFogLights = digitalRead(buttonPinRearFogLights);
    
    if(TailLights == HIGH && Break == LOW){
      
      if(TailState == 0){
        for(int i = 0; i <= sizeof(tailLightModel) / sizeof(tailLightModel[0]); i++){
          delay(delayTail);
          leds[0][tailLightModel[i]]=CHSV(0,255,maxBrtTailLights);
          FastLED.show();
        }
        TailState = 3;
      }else if(TailState == 1 || BrakeState == 1){
        fill_solid(leds[0], NUM_LEDS_PER_STRIP, CRGB::Black);
        TailState = 2;
        BrakeState = 0;
      }else if(TailState = 2){
        for(int i = 0; i <= sizeof(tailLightModel) / sizeof(tailLightModel[0]); i++){
          leds[0][tailLightModel[i]]=CHSV(0,255,maxBrtTailLights);
        }
        TailState = 3;
      }
      
    }else if(Break == HIGH){
      
      fill_solid( leds[0], NUM_LEDS_PER_STRIP, CHSV(0,255,maxBrtBreak));
      BrakeState = 1;
      if(TailLights == HIGH){
        TailState = 1;        
      }
      
    }else{
      
      if(TailState == 3){
        for(int i = sizeof(tailLightModel) / sizeof(tailLightModel[0]); i >= 0 ; i--){
          delay(delayTail);
          leds[0][tailLightModel[i]]=CHSV(0,0,0);
          FastLED.show();
          TailState = 0;
        }
      }else{
         fill_solid(leds[0], NUM_LEDS_PER_STRIP, CRGB::Black);
      }
      
    }

    if(ReverseLights == HIGH){
      
      for(int i = 0; i < sizeof(reverseLightModel) / sizeof(reverseLightModel[0]); i++){
        leds[0][reverseLightModel[i]]=CHSV(0,0,maxBrtReverseLights);
      }
      ReverseState = 1;
      if(TailLights == HIGH){
        TailState = 2;        
      }
        
    }else{
      
      if(ReverseState == 1){
        ReverseState = 0;
        if(TailLights == HIGH){
          TailState = 1;        
        }
      }
        
    }

    if(RearFogLights == HIGH){
      
      for(int i = 0; i < sizeof(rearFogLightsModel) / sizeof(rearFogLightsModel[0]); i++){
        leds[0][rearFogLightsModel[i]]=CHSV(0,255,maxBrtRearFogLights);
      }
      FogState = 1;
      if(TailLights == HIGH){
        TailState = 2;        
      }
        
    }else{
      
      if(FogState == 1){
        FogState = 0;
        if(TailLights == HIGH){
          TailState = 1;        
        }
      }
        
    }

    FastLED.show();
}