// guix-web - Web interface for GNU Guix
// Copyright © 2014  David Thompson <davet@gnu.org>
//
// This program is free software: you can redistribute it and/or
// modify it under the terms of the GNU Affero General Public License
// as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// This program 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
// Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public
// License along with this program.  If not, see
// <http://www.gnu.org/licenses/>.



(function() {
  var packages = guix.packages = {};

  packages.Packages = function() {
    return m.request({
      method: "GET",
      url: "packages.json",
      background: true
    });
  };

  packages.Sorter = (function() {
    function Sorter(field, isDescending) {
      this.field = field;
      this.isDescending = _.isUndefined(isDescending) ? false : isDescending;
    };

    Sorter.prototype.sort = function(array) {
      var result = _.sortBy(array, this.field);

      return this.isDescending ? result.reverse() : result;
    };

    Sorter.prototype.reverse = function() {
      return new packages.Sorter(this.field, !this.isDescending);
    };

    return Sorter;
  })();

  packages.Pager = (function() {
    function Pager(items, pageSize) {
      this.pageSize= pageSize;
      this.pageIndex = 0;
      this.pages = guix.chunk(items, pageSize);
    }

    Pager.prototype.currentPage = function() {
      return this.pages[this.pageIndex];
    };

    Pager.prototype.pageCount = function() {
      return this.pages.length;
    };

    Pager.prototype.isEmpty = function() {
      return this.pageCount() === 0;
    };

    Pager.prototype.isFirstPage = function() {
      return this.pageIndex === 0;
    };

    Pager.prototype.isLastPage = function() {
      return this.pageIndex === this.pages.length - 1;
    };

    Pager.prototype.isCurrentPage = function(i) {
      return this.pageIndex === i;
    };

    Pager.prototype.nextPage = function() {
      this.pageIndex = Math.min(this.pageCount() - 1, this.pageIndex + 1);
    };

    Pager.prototype.previousPage = function() {
      this.pageIndex = Math.max(0, this.pageIndex - 1);
    };

    Pager.prototype.gotoPage = function(page) {
      this.pageIndex = guix.clamp(page, 0, this.pageCount() -1);
    };

    return Pager;
  })();

  packages.PHASE_NONE = 0;
  packages.PHASE_PROMPT = 1;
  packages.PHASE_DERIVATION = 2;
  packages.PHASE_SUCCESS = 3;
  packages.PHASE_ERROR = 4;
})();