int inPin=D3;
int val = 0;      // variable to store the read value
int vals[]={0,0,0,0};
int mycounter=1;
int readbits=0;
int onecounter=0;
int odotusaika=10;
int barcode[100];
int barcodejarjestys;

#include <Adafruit_NeoPixel.h>
#define NEOPIXELPIN D8 // Datapin for the the built-in NeoPixel
#define NUMPIXELS 4 //Amount of NeoPixels
Adafruit_NeoPixel pixels(NUMPIXELS, NEOPIXELPIN, NEO_RGB + NEO_KHZ800);
#define DELAYVAL 500 // Time (in milliseconds) to pause between loop

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(inPin, INPUT);    // sets the digital pin 7 as input
  barcodejarjestys=0;

  pixels.begin();
}

int dataatulee=0;
void loop() {
  // put your main code here, to run repeatedly:
  if(dataatulee==0&&millis()%(odotusaika/10)==0){
    //delay(odotusaika/10);
    val=digitalRead(inPin);
    if(val==1) {
      dataatulee=1;
      delay(odotusaika/2-odotusaika/10);
    }
  }
  while(dataatulee==1){
  
  val=digitalRead(inPin);
  //if(readbits==0){
    //Serial.print(val);
  //}

  mycounter=mycounter+1;
  vals[mycounter-1]=val;
  
  
  if((val==1)&&(readbits==0)) {
    onecounter=onecounter+1;
    //Serial.println("lisattiin yksi");
    if(onecounter==4){
      readbits=1;
      onecounter=0;
      mycounter=0;
      Serial.println("Start reading");
    }
  }
  if((val==0)&&(readbits==0)) {
    onecounter=0;
  }
  if((readbits==1)&&(mycounter==4))
  {
   // Serial.println("aaaa");
   // for(int kk=0;kk<=3;kk=kk+1){
   // Serial.print(vals[kk]);
   // }
   // Serial.println("bbbb");
    
    if(vals[0]==0&&vals[1]==0&&vals[2]==0&&vals[3]==1) barcode[barcodejarjestys]=1;//Serial.println("got 1");
    if(vals[0]==0&&vals[1]==0&&vals[2]==1&&vals[3]==0) barcode[barcodejarjestys]=2;//Serial.println("got 2");
    if(vals[0]==0&&vals[1]==0&&vals[2]==1&&vals[3]==1) barcode[barcodejarjestys]=3;//Serial.println("got 3");
    if(vals[0]==0&&vals[1]==1&&vals[2]==0&&vals[3]==0) barcode[barcodejarjestys]=4;//Serial.println("got 4");
    if(vals[0]==0&&vals[1]==1&&vals[2]==0&&vals[3]==1) barcode[barcodejarjestys]=5;//Serial.println("got 5");
    if(vals[0]==0&&vals[1]==1&&vals[2]==1&&vals[3]==0) barcode[barcodejarjestys]=6;//Serial.println("got 6");
    if(vals[0]==0&&vals[1]==1&&vals[2]==1&&vals[3]==1) barcode[barcodejarjestys]=7;//Serial.println("got 7");
    if(vals[0]==1&&vals[1]==0&&vals[2]==0&&vals[3]==0) barcode[barcodejarjestys]=8;//Serial.println("got 8");
    if(vals[0]==1&&vals[1]==0&&vals[2]==0&&vals[3]==1) barcode[barcodejarjestys]=9;//Serial.println("got 9");
    if(vals[0]==1&&vals[1]==0&&vals[2]==1&&vals[3]==0) barcode[barcodejarjestys]=0;//Serial.println("got 0");

    barcodejarjestys=barcodejarjestys+1;

    if(vals[0]==0&&vals[1]==0&&vals[2]==0&&vals[3]==0) {
      Serial.println("Stop reading");
      readbits=0;
      dataatulee=0;
      Serial.println(barcodejarjestys);
      for(int uu=0;uu<barcodejarjestys;uu=uu+1){
        Serial.print(barcode[uu]);
      }
      Serial.println();
      lukemisenjalkeen(barcode,barcodejarjestys);
      barcodejarjestys=0;
    }

    }
  if(mycounter==4) {
    mycounter=0;
  }
  delay(odotusaika);
  
  }
  
  
}

void lukemisenjalkeen(int barcode[], int merkkienlkm) {
  int verrattava1[]={0,7,0,1,7,7,0,7,7,5,6,3};
  int verrattava2[]={5,0,2,1,9,9,1,2,4,5,4,9,7};
  int ledit[]={0,0,0,0,0,0,0,0,0};  
  int issame;
  int lenArray1=sizeof(verrattava1)/sizeof(verrattava1[0]);
  int lenArray2=sizeof(verrattava2)/sizeof(verrattava2[0]);
  int R,G,B;
  Serial.println(lenArray1);
  Serial.println(merkkienlkm-1);
  if (array_cmp(barcode, verrattava1, merkkienlkm-1, lenArray1) == true){
            Serial.println("sama kuin 1");
            ledit[0]=1;
      }
  else if(array_cmp(barcode, verrattava2, merkkienlkm-1, lenArray2)){
            Serial.println("sama kuin 2");
            ledit[2]=1;
            ledit[3]=1;
      }
  else {
    Serial.println("ei mikaan noista");
  }
  R=0;
  G=255;
  B=0;
  pixels.clear();
  for (int ee=0;ee<9;ee=ee+1) {
    if(ledit[ee]==1) pixels.setPixelColor(ee, pixels.Color(R, G, B)); 
    Serial.println(ee);
    }
  pixels.show(); // Send the updated pixel colors to the hardware.
  delay(DELAYVAL); // wait between
  pixels.clear();

  //for (int oo=0;oo<9;oo=oo+1) {
  //  Serial.println(ledit[oo]);    
  //    }

  /*issame=0;
  if(merkkienlkm-1==lenArray1){
    int issame=1;
    for(int rr=0;rr<merkkienlkm-1;rr=rr+1){
      Serial.print(verrattava1[rr]);
      Serial.print(",");
      Serial.print(barcode[rr]);
      Serial.println();
      if(verrattava1[rr]!=barcode[rr]) {
        issame=0;
        Serial.println("ero");
        }      
    }
    if(issame==1) {
      Serial.println("Barcode==verrattava1");
    }
  }*/
}

boolean array_cmp(int *a, int *b, int len_a, int len_b){ // Source:https://forum.arduino.cc/t/comparing-two-arrays/5211/2
      int n;

      // if their lengths are different, return false
      if (len_a != len_b) return false;

      // test each element to be the same. if not, return false
      for (n=0;n<len_a;n++) if (a[n]!=b[n]) return false;

      //ok, if we have not returned yet, they are equal :)
      return true;
}