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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(true);

  // 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.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();
    tag.print();

    display.clearDisplay();
    display.setCursor(10, 0);
    display.setTextSize(1);
    display.setTextColor(WHITE);
    display.printf("UID Length: %d bytes", tag.getUidLength());

    if (tag.hasNdefMessage()) {
      NdefMessage message = tag.getNdefMessage();
      message.print();

      display.setCursor(0, 20);
      display.setTextSize(1);
      display.setTextColor(WHITE);
      display.printf("NDEF Message has %d records", message.getRecordCount());
    }

    // Wait a bit before trying again
    Serial.println("\n\nSend a character to scan another tag!");
    Serial.flush();
    while (!Serial.available())
      ;
    while (Serial.available()) {
      Serial.read();
    }
    Serial.flush();
  }
}