/*jshint strict: false */

////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2016 ArangoDB GmbH, Cologne, Germany
/// Copyright 2014 triagens GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
///     http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is triAGENS GmbH, Cologne, Germany
///
/// @author Dr. Frank Celler, Lucas Dohmen
////////////////////////////////////////////////////////////////////////////////

var db = require("@arangodb").db;
var internal = require("internal");

////////////////////////////////////////////////////////////////////////////////
/// @brief the frontend collection
////////////////////////////////////////////////////////////////////////////////

function getFrontendCollection () {
  var frontend = db._collection("_frontend");

  if (frontend === null) {
    throw new Error("_frontend collection not (yet) available");
  }
  return frontend;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief the notifications configuration
////////////////////////////////////////////////////////////////////////////////

exports.notifications = {};

////////////////////////////////////////////////////////////////////////////////
/// @brief returns the versions notification
////////////////////////////////////////////////////////////////////////////////

exports.notifications.versions = function () {
  var n = "notifications";
  var v = "versions";
  var d;
  var frontend = getFrontendCollection();

  try {
    d = frontend.document(n);
  }
  catch (err) {
    try {
      d = frontend.save({ _key: n });
    }
    catch (err2) {
      d = {};
    }
  }

  d = d._shallowCopy;

  if (! d.hasOwnProperty(v)) {
    d.versions = {};
  }

  if (! internal.frontendVersionCheck) {
    d.enableVersionNotification = false;
  }

  return d;
};

////////////////////////////////////////////////////////////////////////////////
/// @brief sets the versions notification
////////////////////////////////////////////////////////////////////////////////

exports.notifications.setVersions = function (data) {
  var n = "notifications";
  var d;
  var frontend = getFrontendCollection();

  try {
    d = frontend.document(n);
  }
  catch (err) {
    d = frontend.save({ _key: n });
  }

  frontend.update(n, data);
};