'use strict';

/* global LazyLoader, ContactToVcard, MozNDEFRecord, fb, utils,
          NDEF, NfcUtils, utils*/
/* exported NFC */

(function(exports) {
  var mozNfc = window.navigator.mozNfc;
  var currentContact;
  var vCardContact;
  var mozNfcPeer;

  var startListening = function(contact) {
    if (!mozNfc) {
      return;
    }

    currentContact = contact;
    // We cannot share Facebook data via NFC so we check if the contact
    // is an FB contacts. However, if the contact is linked to a regular
    // mozContact, we can share linked data
    if (fb && !(fb.isFbContact(contact) && !fb.isFbLinked(contact))) {
      mozNfc.onpeerready = handlePeerReady;
    } else {
      mozNfc.onpeerready = handlePeerReadyForFb;
    }
  };

  var stopListening = function() {
    if (!mozNfc) {
      return;
    }

    mozNfc.onpeerready = null;
    currentContact = null;
    vCardContact = null;
    mozNfcPeer = null;
  };

  var handlePeerReady = function(event) {
    mozNfcPeer = event.peer;
    LazyLoader.load([
      '/shared/js/contact2vcard.js',
      '/shared/js/setImmediate.js',
      '/shared/js/nfc_utils.js'
      ], function() {
      ContactToVcard(
        [currentContact],
        function append(vcard) {
          vCardContact = vcard;
        },
        function success() {
          sendContact();
        },
        // use default batch size
        null,
        // We don't want to share a profile photo via NFC,
        // like on Android:
        // https://bugzilla.mozilla.org/show_bug.cgi?id=1003767#c5
        true
      );
    });
  };

  var sendContact = function() {
     var nfcUtils = new NfcUtils();
     var NDEFRecord = new MozNDEFRecord({
       tnf: NDEF.TNF_MIME_MEDIA,
       type: nfcUtils.fromUTF8('text/vcard'),
       payload: nfcUtils.fromUTF8(vCardContact)
     });

     var promise = mozNfcPeer.sendNDEF([NDEFRecord]);
     promise.then(() => {
       console.log('Contact succesfuly sent');
     }).catch(e => {
       console.log('Something goes wrong : ' + e);
     });
  };

  var handlePeerReadyForFb = function() {
    utils.status.show({
      id: 'facebook-export-forbidden'
    });
  };

  var nfc_tools = {
    startListening: startListening,
    stopListening: stopListening
  };

  exports.NFC = nfc_tools;

}(window));