// Copyright 2014 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.

// Use the <code>chrome.gcdPrivate</code> API to discover GCD APIs and register
// them.
namespace gcdPrivate {

  enum SetupType { mdns, wifi, cloud };

  // Represents a GCD device discovered locally or registered to a given user.
  dictionary GCDDevice {
    // Opaque device identifier to be passed to API.
    DOMString deviceId;

    // How this device was discovered.
    SetupType setupType;

    // Cloud identifier string.
    DOMString? cloudId;

    // Device type (camera, printer, etc)
    DOMString deviceType;

    // Device human readable name.
    DOMString deviceName;

    // Device human readable description.
    DOMString deviceDescription;
  };

  enum Status {
    // populateWifiPassword was true and the password has not been prefetched.
    wifiPasswordError,

    // populateWifiPassword was true and the message cannot be parsed as a setup
    // message.
    setupParseError,

    // Could not connect to the device.
    connectionError,

    // Error in establishing session.
    sessionError,

    // Unknown session.
    unknownSessionError,

    // Bad confirmation code. Ask user to retype.
    badConfirmationCodeError,

    // Success.
    success
  };

  enum ConfirmationType {
    displayCode,
    stickerCode
  };

  // Information regarding the confirmation of a device.
  dictionary ConfirmationInfo {
    // Type of confirmation.
    ConfirmationType type;

    // Code if available.
    DOMString? code;
  };

  callback CloudDeviceListCallback = void(GCDDevice[] devices);

  // |commandDefinitions| : Is "commandDefs" value of device described at
  // https://developers.google.com/cloud-devices/v1/reference/devices
  // TODO(vitalybuka): consider to describe object in IDL.
  callback CommandDefinitionsCallback = void(object commandDefinitions);

  // |command| : Described at
  // https://developers.google.com/cloud-devices/v1/reference/commands
  // TODO(vitalybuka): consider to describe object in IDL.
  callback CommandCallback = void(object command);

  // |commands| : Array of commands described at
  // https://developers.google.com/cloud-devices/v1/reference/commands
  // TODO(vitalybuka): consider to describe object in IDL.
  callback CommandListCallback = void(object[] commands);

  // Called when the confirmation code is available or on error.
  // |sessionId| is the session ID (identifies the session for future calls)
  // |status| is the status (success or type of error)
  // |confirmation| is the information about the confirmation.
  callback ConfirmationCodeCallback = void(long sessionId,
                                           Status status,
                                           ConfirmationInfo confirmation);

  // Called to indicated the session is established.
  // |status| is the status (success or type of error)
  callback SessionEstablishedCallback = void(Status status);

  // Called when the response to the message sent is available or on error.
  // |status| is the status (success or type of error)
  // |response| is the response object or null on error
  callback MessageResponseCallback = void(Status status,
                                          object response);

  // Called as a response to |prefetchWifiPassword|
  // |success| Denotes whether the password fetch has succeeded or failed.
  callback SuccessCallback = void(boolean success);

  // Called as a response to |getPrefetchedWifiNameList|
  // |list| the list of ssids for which wifi passwords were prefetched.
  callback SSIDListCallback = void(DOMString[] networks);

  interface Functions {
    // Returns the list of cloud devices visible locally or available in the
    // cloud for user account.
    static void getCloudDeviceList(CloudDeviceListCallback callback);

    // Queries network for local devices. Triggers an onDeviceStateChanged and
    // onDeviceRemoved events. Call this function *only* after registering for
    // onDeviceStateChanged and onDeviceRemoved events, or it will do nothing.
    static void queryForNewLocalDevices();

    // Cache the WiFi password in the browser process for use during
    // provisioning. This is done to allow the gathering of the wifi password to
    // not be done while connected to the device's network. Callback is called
    // with true if wifi password was cached and false if it was unavailable.
    static void prefetchWifiPassword(DOMString ssid, SuccessCallback callback);

    // Get the list of ssids with prefetched callbacks.
    static void getPrefetchedWifiNameList(SSIDListCallback callback);

    // Establish the session.
    static void establishSession(DOMString ipAddress,
                                 long port,
                                 ConfirmationCodeCallback callback);

    // Send confirmation code. Device will still need to confirm. |code| must be
    // present and must match the code from the device, even when the code is
    // supplied in the |ConfirmationInfo| object.
    static void confirmCode(long sessionId,
                            DOMString code,
                            SessionEstablishedCallback callback);

    // Send an encrypted message to the device. |api| is the API path and
    // |input| is the input object. If the message is a setup message with a
    // wifi ssid specified but no password, the password cached from
    // |prefetchWifiPassword| will be used and the call will fail if it's not
    // available. For open networks use an empty string as the password.
    static void sendMessage(long sessionId,
                            DOMString api,
                            object input,
                            MessageResponseCallback callback);

    // Terminate the session with the device.
    static void terminateSession(long sessionId);

    // Returns command definitions.
    // |deviceId| : The device to get command definitions for.
    // |callback| : The result callback.
    static void getCommandDefinitions(DOMString deviceId,
                                      CommandDefinitionsCallback callback);

    // Creates and sends a new command.
    // |deviceId| : The device to send the command to.
    // |expireInMs| : The number of milliseconds since now before the command
    // expires. Expired command should not be executed by device. Acceptable
    // values are 10000 to 2592000000, inclusive. All values outside that range
    // will be replaced by 2592000000.
    // |command| : Described at
    // https://developers.google.com/cloud-devices/v1/reference/commands
    // |callback| : The result callback.
    static void insertCommand(DOMString deviceId,
                              long expireInMs,
                              object command,
                              CommandCallback callback);

    // Returns a particular command.
    // |commandId| : Unique command ID.
    // |callback| : The result callback.
    static void getCommand(DOMString commandId, CommandCallback callback);

    // Cancels a command.
    // |commandId| : Unique command ID.
    // |callback| : The result callback.
    static void cancelCommand(DOMString commandId, CommandCallback callback);

    // Lists all commands in order of creation.
    // |deviceId| : The device to get the commands for.
    // |byUser| : List all the commands issued by the user. Special value 'me'
    // can be used to list by the current user.
    // |state| : Command state.
    // |callback| : The result callback.
    static void getCommandsList(DOMString deviceId,
                                DOMString byUser,
                                DOMString state,
                                CommandListCallback callback);
  };

  interface Events {
    // Subscribe to this event to start listening new or updated devices. New
    // listeners will get called with all known devices on the network, and
    // status updates for devices available through the cloud.
    static void onDeviceStateChanged(GCDDevice device);

    // Notifies that device has disappeared.
    // |deviceId| : The device has disappeared.
    static void onDeviceRemoved(DOMString deviceId);
  };
};