/*
 * SonarQube, open source software quality management tool.
 * Copyright (C) 2008-2014 SonarSource
 * mailto:contact AT sonarsource DOT com
 *
 * SonarQube is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * SonarQube is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
define(function () {

  return Backbone.Model.extend({
    defaults: function () {
      return {
        page: 1,
        maxResultsReached: false,
        query: {},
        facets: []
      };
    },

    nextPage: function () {
      var page = this.get('page');
      this.set({ page: page + 1 });
    },

    clearQuery: function (query) {
      var q = {};
      Object.keys(query).forEach(function (key) {
        if (query[key]) {
          q[key] = query[key];
        }
      });
      return q;
    },

    _areQueriesEqual: function (a, b) {
      var equal = Object.keys(a).length === Object.keys(b).length;
      Object.keys(a).forEach(function (key) {
        equal = equal && a[key] === b[key];
      });
      return equal;
    },

    updateFilter: function (obj, options) {
      var oldQuery = this.get('query'),
          query = _.extend({}, oldQuery, obj),
          opts = _.defaults(options || {}, { force: false });
      query = this.clearQuery(query);
      if (opts.force || !this._areQueriesEqual(oldQuery, query)) {
        this.setQuery(query);
      }
    },

    setQuery: function (query) {
      this.set({ query: query }, { silent: true });
      this.set({ changed: true });
      this.trigger('change:query');
    }
  });

});
