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// NFC INITIATION
#include <Arduino.h>
#include <NfcAdapter.h>
#include <PN532.h>
#include <PN532_I2C.h>
#include <Wire.h>

PN532_I2C pn532i2c(Wire);
NfcAdapter nfc = NfcAdapter(pn532i2c);

// OLED INITIATION
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
#define SCREEN_ADDRESS 0x3C

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup(void) {
  Serial.begin(115200);
  Serial.println("Hello!");

  nfc.begin();

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Don't proceed, loop forever
  }

  Serial.println("Waiting for an ISO14443A card");

  display.clearDisplay();
  display.setCursor(0, 40); // oled display
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.print("Waiting for NFC Card");
  display.display();
}

void loop(void) {
  if (nfc.tagPresent())
  {
    NfcTag tag = nfc.read();
    Serial.println(tag.getTagType());
    Serial.print("UID: ");Serial.println(tag.getUidString()); // Retrieves the Unique Identification from your tag

    if (tag.hasNdefMessage()) // If your tag has a message
    {

      NdefMessage message = tag.getNdefMessage();
      Serial.print("\nThis Message in this Tag is ");
      Serial.print(message.getRecordCount());
      Serial.print(" NFC Tag Record");
      if (message.getRecordCount() != 1) { 
        Serial.print("s");
      }
      Serial.println(".");

      // If you have more than 1 Message then it wil cycle through them
      int recordCount = message.getRecordCount();
      for (int i = 0; i < recordCount; i++)
      {
        Serial.print("\nNDEF Record ");Serial.println(i+1);
        NdefRecord record = message.getRecord(i);

        int payloadLength = record.getPayloadLength();
        byte payload[payloadLength];
        record.getPayload(payload);


        String payloadAsString = ""; // Processes the message as a string vs as a HEX value
        for (int c = 0; c < payloadLength; c++) {
          payloadAsString += (char)payload[c];
        }
        Serial.print("  Information (as String): ");
        Serial.println(payloadAsString);


        String uid = record.getId();
        if (uid != "") {
          Serial.print("  ID: ");Serial.println(uid); // Prints the Unique Identification of the NFC Tag
        }
      }
    }
  }
  delay(10000);
}