/*
* Signal     Pin              Pin               Pin
*            Arduino Uno      Arduino Mega      MFRC522 board
* ------------------------------------------------------------
* Reset      9                5                 RST
* SPI SS     10               53                SDA
* SPI MOSI   11               51                MOSI
* SPI MISO   12               50                MISO
* SPI SCK    13               52                SCK
*/

#include <SPI.h>
#include <MFRC522.h>

#define SS_PIN 10
#define RST_PIN 9

#define LED_BOX 6
#define LED_PLATFORMS 5

int LedStatus=0;
bool onBox = false;

MFRC522 mfrc522(SS_PIN, RST_PIN);

long previousMillis = 0;
long interval = 10;

String uid_s;
String uid_old = "";

String uidRFID[] = {"b278d53b","8084d53b","d683d53b","01020304","7b83d53b","427ad53b"};

void setup() {

  Serial.begin(9600); // Initialize serial communications with the PC
  SPI.begin();        // Init SPI bus
  mfrc522.PCD_Init(); // Init MFRC522 card
  //Serial.println("In attesa di lettura...");

  pinMode(LED_BOX, OUTPUT);
  pinMode(LED_PLATFORMS, OUTPUT);

}

void loop() {

  unsigned long currentMillis = millis();

  if(currentMillis - previousMillis > interval) {
    previousMillis = currentMillis;

    // Look for new cards
    if ( ! mfrc522.PICC_IsNewCardPresent()) {

      if(LedStatus==200){
        for(LedStatus=200;LedStatus>=0;LedStatus--){
          analogWrite(LED_BOX,LedStatus);
          analogWrite(LED_PLATFORMS,200-LedStatus);
          delay(10);
        }
        onBox = false;
      }
      return;
    }

    // Select one of the cards
    if ( ! mfrc522.PICC_ReadCardSerial()) {
      return;
    }

    if(LedStatus<200){
      for(LedStatus=0;LedStatus<200;LedStatus++){
        analogWrite(LED_BOX,LedStatus);
        analogWrite(LED_PLATFORMS,200-LedStatus);
        delay(10);
      }
      onBox = true;
    }

    uid_s = "";

    if (!mfrc522.PICC_IsNewCardPresent() && !mfrc522.PICC_ReadCardSerial()) {

      for (byte i = 0; i < mfrc522.uid.size; i++) {

        String uid_a = String(mfrc522.uid.uidByte[i] < 0x10 ? "0" : "");
        String uid_b = String(mfrc522.uid.uidByte[i], HEX);

        uid_s = uid_s+uid_a+uid_b;
      }
    }

    if(uid_s != uid_old || onBox){
      onBox = false;
      uid_old = uid_s;
      //Serial.print("RFID UID rivelato --> ");
      //Serial.println(uid_s);
      //Serial.println("");

      boolean control = false;
      for (int i = 0; i < sizeof(uidRFID)/sizeof(String); i++){

        if(uidRFID[i] == uid_s){

          Serial.print("ID");
          Serial.print("\t");
          Serial.println(i);
          control = true;
          break;

        }
      }

      if(!control){
        //Serial.println("Accesso vietato");
        delay(1000);
      }

      //Serial.println();
      //Serial.println("In attesa di lettura...");
    }
  }
}