const ndef = require('nfccard-tool');

// Starts reading in block 0 for 20 bytes long
const cardHeader = await reader.read(0, 20);

const tag = nfcCard.parseInfo(cardHeader);
console.log('tag info:', JSON.stringify(tag));

// There might be a NDEF message and we are able to read the tag
if(nfcCard.isFormatedAsNDEF() && nfcCard.hasReadPermissions() && nfcCard.hasNDEFMessage()) {

  // Read the appropriate length to get the NDEF message as buffer
  const NDEFRawMessage = await reader.read(4, nfcCard.getNDEFMessageLengthToRead()); // starts reading in block 0 until 6

  // Parse the buffer as a NDEF raw message
  const NDEFMessage = nfcCard.parseNDEF(NDEFRawMessage);

  console.log('NDEFMessage:', NDEFMessage);

} else {
  console.log('Could not parse anything from this tag: \n The tag is either empty, locked, has a wrong NDEF format or is unreadable.')
}

// 1 - READ HEADER

// Starts reading in block 0 until end of block 4
const cardHeader = await reader.read(0, 20);

const tag = nfcCard.parseInfo(cardHeader);
console.log('tag info:', JSON.stringify(tag));


// 2 - WRITE A NDEF MESSAGE AND ITS RECORDS

const message = [
  { type: 'text', text: 'I\'m a text message', language: 'en' },
  { type: 'uri', uri: 'https://github.com/somq' },
  { type: 'aar', packageName: 'https://github.com/somq' },
]

// Prepare the buffer to write on the card
const rawDataToWrite = nfcCard.prepareBytesToWrite(message);

// Write the buffer on the card starting at block 4
const preparationWrite = await reader.write(4, rawDataToWrite.preparedData);

// Success !
if (preparationWrite) {
  console.log('Data have been written successfully.')
}

NDEFMessage:
[
  { NDEFLibRecord:
     { LanguageCode: null,
       text: null,
       _typeNameFormat: 1,
       _type: [Array],
       _id: [],
       _payload: [Array] },
    type: 'text',
    text: 'I\'m a text message',
    language: 'en' },
  { NDEFLibRecord:
     { RawUri: [],
       Uri: '',
       _typeNameFormat: 1,
       _type: [Array],
       _id: [],
       _payload: [Array],
       type: 'U' },
    type: 'uri',
    uri: 'https://github.com/somq' },
  { NDEFLibRecord:
     { packageName: '',
       _typeNameFormat: 4,
       _type: [Array],
       _id: [],
       _payload: [Array],
       type: 'android.com:pkg' },
    type: 'aar',
    packageName: 'https://github.com/somq' }
]

// Magic number
nfcCard.isFormatedAsNDEF();

// Type 2 Tag Specification version, eg. 1.0
nfcCard.getType2SpecVersion();

// Max NDEF size for the current tag
nfcCard.getMaxNDEFMessageLength();

// Read locked ?
nfcCard.hasReadPermissions();

// Read types: HAS_READ_ACCESS, RFU, PROPRIETARY, UNKNOWN
nfcCard.getReadPermissionsType();

// Write locked ?
nfcCard.hasWritePermissions();

// Write types: HAS_READ_ACCESS, RFU, PROPRIETARY, UNKNOWN
nfcCard.getWritePermissionsType();

// NDEF message flag is present ?
nfcCard.hasNDEFMessage();

// NDEF message length on exists on the tag
nfcCard.getNDEFMessageLength();

{
    "headerValues":{
        "raw":{ // Raw buffer values
            "Lock":{
                "LOCK0":0, // Lock 0 status - block 2, byte 2
                "LOCK1":0 // Lock 1 status - block 2, byte 3
            },
            "capabilityContainer":{
                "MAGIC_NUMBER":225, // magic number - block 3, byte 0 (CC0)
                "SPEC_VERSION":16, // type 2 spec version - block 3, byte 1 (CC1)
                "MAX_NDEF_LENGTH":109, // max ndef message length - block 3, byte 2 (CC2)
                "READ_ACCESS":0, // read access - block 3, byte 3 (CC3)
                "WRITE_ACCESS":0 // write access - block 3, byte 3 (CC3)
            },
            "NDEFMessageHeader":{
                "HAS_NDEF":3, // NDEF header 0 - block 4, byte 0
                "MESSAGE_LENGTH":86 // NDEF header 1 - block 4, byte 1
            }
        },
        "string":{ // Hex string values
            "Lock":{
                "LOCK0":"0",
                "LOCK1":"0"
            },
            "capabilityContainer":{
                "MAGIC_NUMBER":"E1",
                "SPEC_VERSION":"10",
                "MAX_NDEF_LENGTH":"6D",
                "READ_ACCESS":"0",
                "WRITE_ACCESS":"0"
            },
            "NDEFMessageHeader":{
                "HAS_NDEF":"3",
                "MESSAGE_LENGTH":"56"
            }
        }
    },
    "parsedHeader":{
        "isFormatedAsNDEF":true, // magic number - block 3, byte 0 (CC0)
        "type2SpecVersion":"1.0", // type 2 spec version - block 3, byte 1 (CC1)
        "maxNDEFMessageSize":872, // max ndef message length - block 3, byte 2
        "hasReadPermissions":true, // read access - block 3, byte 3 (CC3)
        "getReadPermissionsType":"HAS_READ_ACCESS",
        "hasWritePermissions":true, // write access - block 3, byte 3 (CC3)
        "writePermissionsType":"HAS_WRITE_ACCESS",
        "hasNDEFMessage":true, // NDEF header 0 - block 4, byte 0
        "NDEFMessageLength":86, // NDEF header 1 - block 4, byte 1
        "lengthToReadFromBlock4":88 // NDEFMessageLength + 2
    }

}