/*

By Ananords - https://github.com/ananords

   Write song number data to a MIFARE RFID card using a RFID-RC522 reader
   Uses MFRC522 - Library to use ARDUINO RFID MODULE KIT 13.56 MHZ WITH TAGS SPI W AND R BY COOQROBOT.
   -----------------------------------------------------------------------------------------
               MFRC522      Arduino       Arduino   Arduino    Arduino          Arduino
               Reader/PCD   Uno/101       Mega      Nano v3    Leonardo/Micro   Pro Micro
   Signal      Pin          Pin           Pin       Pin        Pin              Pin
   -----------------------------------------------------------------------------------------
   RST/Reset   RST          9             5         D9         RESET/ICSP-5     RST
   SPI SS      SDA(SS)      10            53        D10        10               10
   SPI MOSI    MOSI         11 / ICSP-4   51        D11        ICSP-4           16
   SPI MISO    MISO         12 / ICSP-1   50        D12        ICSP-1           14
   SPI SCK     SCK          13 / ICSP-3   52        D13        ICSP-3           15
   Hardware required:
   Arduino
   PCD (Proximity Coupling Device): NXP MFRC522 Contactless Reader IC
   PICC (Proximity Integrated Circuit Card): A card or tag using the ISO 14443A interface, eg Mifare or NTAG203.
   The reader can be found on eBay for around 5 dollars. Search for "mf-rc522" on ebay.com or Aliexpress
*/

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

#define RST_PIN         9           // Configurable, see typical pin layout above
#define SS_PIN          10          // Configurable, see typical pin layout above

String mode;
int currentNumber = -7; //NUMBER TO START FROM

MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance

void setup() {
  Serial.begin(115200);        // Initialize serial communications with the PC
  SPI.begin();               // Init SPI bus
  mfrc522.PCD_Init();        // Init MFRC522 card
  Serial.println(F("\nWrite manual for Manual mode or auto for Automatic mode"));

}


void loop() {

  if (Serial.available()) {

    mode = Serial.readStringUntil('\n');


    if (mode == "auto" || "manual") {
      Serial.println(" ");
      Serial.println("Device is now in " + mode + " mode");
      Serial.println(F("Place the card on the reader and hold it there to write song number data to the card"));
      if (mode == "auto") Serial.println((String)"Number to be written to card: " + currentNumber);

    }

    while (mode == "auto") {

      autoModus();


    }


    while (mode == "manual") {


      manualModus();


    }

    if (mode != "auto" || "manual") {

      Serial.println("Wrong value, write auto or manual");

    }


  }



}

void autoModus() {



  // Prepare key - all keys are set to FFFFFFFFFFFFh at chip delivery from the factory.
  MFRC522::MIFARE_Key key;
  for (byte i = 0; i < 6; i++) key.keyByte[i] = 0xFF;

  // Reset the loop if no new card present on the sensor/reader. This saves the entire process when idle.
  if ( mfrc522.PICC_IsNewCardPresent()) {

    Serial.println(" ");

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

    Serial.print(F("Card UID:"));    //Dump UID
    for (byte i = 0; i < mfrc522.uid.size; i++) {
      Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
      Serial.print(mfrc522.uid.uidByte[i], HEX);
    }


    Serial.print(F(" PICC type: "));   // Dump PICC type
    MFRC522::PICC_Type piccType = mfrc522.PICC_GetType(mfrc522.uid.sak);
    Serial.println(mfrc522.PICC_GetTypeName(piccType));

    byte buffer[16];
    MFRC522::StatusCode status;
    byte block;
    byte len;
    block = 1;



    len = sprintf(buffer, "%d", currentNumber);
    for (byte i = len; i < 30; i++) buffer[i] = ' ';


    //Serial.println(F("Authenticating using key A..."));
    status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, block, &key, &(mfrc522.uid));
    if (status != MFRC522::STATUS_OK) {
      Serial.print(F("PCD_Authenticate() failed: "));
      Serial.println(mfrc522.GetStatusCodeName(status));
      return;
    }
    else Serial.println(F("PCD_Authenticate() success: "));

    // Write block
    status = mfrc522.MIFARE_Write(block, buffer, 16);
    if (status != MFRC522::STATUS_OK) {
      Serial.print(F("MIFARE_Write() failed: "));
      Serial.println(mfrc522.GetStatusCodeName(status));
      Serial.print(F("Try to reset the device"));
      return;
    }
    else Serial.println(F("MIFARE_Write() success: "));


    mfrc522.PICC_HaltA(); // Halt PICC
    mfrc522.PCD_StopCrypto1();  // Stop encryption on PCD


    currentNumber++;
    Serial.println((String)"Put a new card on the reader to write the number: " + currentNumber);

  }
}


void manualModus() {


  // Prepare key - all keys are set to FFFFFFFFFFFFh at chip delivery from the factory.
  MFRC522::MIFARE_Key key;
  for (byte i = 0; i < 6; i++) key.keyByte[i] = 0xFF;

  // Reset the loop if no new card present on the sensor/reader. This saves the entire process when idle.
  if ( ! mfrc522.PICC_IsNewCardPresent()) {
    return;
  }

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

  Serial.print(F("Card UID:"));    //Dump UID
  for (byte i = 0; i < mfrc522.uid.size; i++) {
    Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
    Serial.print(mfrc522.uid.uidByte[i], HEX);
  }
  Serial.print(F(" PICC type: "));   // Dump PICC type
  MFRC522::PICC_Type piccType = mfrc522.PICC_GetType(mfrc522.uid.sak);
  Serial.println(mfrc522.PICC_GetTypeName(piccType));

  byte buffer[34];
  byte block;
  MFRC522::StatusCode status;
  byte len;

  Serial.setTimeout(20000L) ;     // wait until 20 seconds for input from serial
  // Ask for song number data
  Serial.println(F("Type any number and hit send/enter"));
  len = Serial.readBytesUntil('\n', (char *) buffer, 30) ; // read number from serial
  for (byte i = len; i < 30; i++) buffer[i] = ' ';     // pad with spaces

  block = 1;
  //Serial.println(F("Authenticating using key A..."));
  status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, block, &key, &(mfrc522.uid));
  if (status != MFRC522::STATUS_OK) {
    Serial.print(F("PCD_Authenticate() failed: "));
    Serial.println(mfrc522.GetStatusCodeName(status));
    return;
  }
  else Serial.println(F("PCD_Authenticate() success: "));

  // Write block
  status = mfrc522.MIFARE_Write(block, buffer, 16);
  if (status != MFRC522::STATUS_OK) {
    Serial.print(F("MIFARE_Write() failed: "));
    Serial.println(mfrc522.GetStatusCodeName(status));
    return;
  }
  else Serial.println(F("MIFARE_Write() success: "));

  Serial.println("Put a new card on the reader to write a new number");



  Serial.println(" ");
  mfrc522.PICC_HaltA(); // Halt PICC
  mfrc522.PCD_StopCrypto1();  // Stop encryption on PCD

}