// 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.

import FauxtonAPI from "./base";
import _ from "lodash";

var CouchdbSession = {
  Session: FauxtonAPI.Model.extend({
    url: '/_session',

    user: function () {
      var userCtx = this.get('userCtx');

      if (!userCtx || !userCtx.name) { return null; }

      return {
        name: userCtx.name,
        roles: userCtx.roles
      };
    },

    isAdmin: function () {
      var userCtx = this.get('userCtx');
      return userCtx.roles.indexOf('_admin') !== -1;
    },

    fetchUser: function (opt) {
      var options = opt || {},
          currentUser = this.user(),
          fetch = _.bind(this.fetchOnce, this);

      if (options.forceFetch) {
        fetch = _.bind(this.fetch, this);
      }

      return fetch(opt).then(function () {
        var user = this.user();

        // Notify anyone listening on these events that either a user has changed
        // or current user is the same
        if (currentUser !== user) {
          this.trigger('session:userChanged');
        } else {
          this.trigger('session:userFetched');
        }

        // this will return the user as a value to all function that calls done on this
        // eg. session.fetchUser().done(user) { .. do something with user ..}
        return user;
      }.bind(this), this.triggerError.bind(this));
    },

    triggerError: function (xhr, type, message) {
      this.trigger('session:error', xhr, type, message);
    }
  })
};

export default CouchdbSession;