/* mifare ultralight example (25-02-2018)
 *
 *   RFID-RC522 (SPI connexion)
 *   
 *   CARD RC522      Arduino (UNO)
 *     SDA1  -----------  10 (Configurable, see SS_PIN constant)
 *     SDA2  -----------  0 (Configurable, see SS_PIN constant)
 *     SCK  -----------  13
 *     MOSI -----------  11
 *     MISO -----------  12
 *     IRQ  ----------- 
 *     GND  -----------  GND
 *     RST  -----------  9 (onfigurable, see RST_PIN constant)
 *     3.3V ----------- 3.3V
 *     
 */

  #include <SPI.h>
  #include <MFRC522.h>
 
 
  #define SS_1_PIN          10
  #define SS_2_PIN          8
  #define RST_PIN         9

  #include <Adafruit_NeoPixel.h>
#ifdef __AVR__
  #include <avr/power.h>
#endif

#define PIN 6

#define NUM_LEDS 141

#define BRIGHTNESS 5
Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_LEDS, PIN, NEO_GRB + NEO_KHZ800);

  constexpr uint8_t NR_OF_READERS = 1;
  byte ssPins[] = {SS_1_PIN, SS_2_PIN};
  
  MFRC522 mfrc522[NR_OF_READERS]; 
  MFRC522::StatusCode status; //variable to get card status
 
  byte buffer[18];  //data transfer buffer (16+2 bytes data+CRC)
  byte size = sizeof(buffer);

  uint8_t pageAddr = 0x06;  //In this example we will write/read 16 bytes (page 6,7,8 and 9).
                            //Ultraligth mem = 16 pages. 4 bytes per page. 
                            //Pages 0 to 4 are for special functions.           
 
void setup() {
  Serial.begin(9600); // Initialize serial communications with the PC
  SPI.begin(); // Init SPI bus
  
  for (uint8_t reader = 0; reader < NR_OF_READERS; reader++) {
    mfrc522[reader].PCD_Init(ssPins[reader], RST_PIN); // Init each MFRC522 card
    Serial.print(F("Reader "));
    Serial.print(reader);
    Serial.print(F(": "));
    mfrc522[reader].PCD_DumpVersionToSerial();


  strip.setBrightness(BRIGHTNESS);
  strip.begin();
  strip.show(); // Initialize all pixels to 'off'

    
  }
  
  Serial.println(F("Sketch has been started!"));

  
}
uint32_t curColor=strip.Color(255,0,0);
String mystring;
int offset = 3;

void loop() {
  for(int r = 0;r<NUM_LEDS;r++){
     strip.setPixelColor(r,strip.Color(0,0,0));
    }
  
  for(int run = 0;run<NUM_LEDS;run++){
    if((run+offset)%4 == 0){
     strip.setPixelColor(run,strip.Color(0,0,0));
    }
    else{
      strip.setPixelColor(run,curColor);
    }
    }
  delay(200);
  if(offset == 0){
    offset = 3;
    }else{
      offset--;
      }
   strip.show();
  if ( ! mfrc522[0].PICC_IsNewCardPresent())
    return;

  // Select one of the cards
  if ( ! mfrc522[0].PICC_ReadCardSerial())
    return;

  // Write data ***********************************************
   
 
 


  // Read data ***************************************************
  Serial.println(F("Reading data ... "));
  //data in 4 block is readed at once.
  status = (MFRC522::StatusCode) mfrc522[0].MIFARE_Read(pageAddr, buffer, &size);
  if (status != MFRC522::STATUS_OK) {
    Serial.print(F("MIFARE_Read() failed: "));
    Serial.println(mfrc522[0].GetStatusCodeName(status));
    return;
  }

  Serial.print(F("Readed data: "));
  //Dump a byte array to Serial
  for (byte i = 0; i < 3; i++) {
    Serial.write(buffer[i]);
  }
  Serial.println();
if(buffer[0]=='w'){
  curColor = strip.Color(255,255,255);
  }
if(buffer[0]=='r'){
  curColor = strip.Color(255,0,0);
  }
 if(buffer[0]=='b'){
  curColor = strip.Color(0,0,255);
  }
  

  mfrc522[0].PICC_HaltA();
 

}