// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

[DartPackage="mojo_services"]
module nfc;

struct NfcData {
  array<uint8>? data;
};

// Represents an in-progress nfc transmission.
interface NfcTransmission {
  // Cancels the nfc transmission.
  Cancel();
};

// NfcReceivers can be registered with Nfc to receive nfc messages.
interface NfcReceiver {
  OnReceivedNfcData(NfcData nfc_data);
};

// Nfc allows data to be sent to and received from other MojoShells on Android.
// Received data is passed to all registered NfcReceivers.
interface Nfc {
  // Puts the MojoShell in a state where it will transmit |nfc_data| to the next
  // Android device to connect to this one via NFC.  This transmission state
  // will remain active until cancelled via |transmission| or a |success|
  // response is received indicating whether the transmission was successful
  // (true) or not (false).  If the Android device transmitted to does not have
  // MojoShell installed it will be directed to the Play Store to download
  // MojoShell.
  TransmitOnNextConnection(NfcData nfc_data, NfcTransmission&? transmission)
    => (bool success);

  // Registers an app to receive nfc messages.  Upon receiving an nfc message
  // the app will be connected to.  If the app exposes a NfcReceiver interface
  // it will be called with the message received.
  Register();

  // Unregisters an app previously registered via |Register()|.
  Unregister();
};