// -- copyright
// OpenProject is a project management system.
// Copyright (C) 2012-2015 the OpenProject Foundation (OPF)
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License version 3.
//
// OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
// Copyright (C) 2006-2013 Jean-Philippe Lang
// Copyright (C) 2010-2013 the ChiliProject Team
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// 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 General Public License for more details.
//
// You should have received a copy of the GNU 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.
//
// See doc/COPYRIGHT.rdoc for more details.
// ++

import {QueryResource} from '../../api/api-v3/hal-resources/query-resource.service';
import {ConfigurationResource} from '../../api/api-v3/hal-resources/configuration-resource.service';
import {ConfigurationDmService} from '../../api/api-v3/hal-resource-dms/configuration-dm.service';
import {States} from '../../states.service';
import {WorkPackageTablePaginationService} from '../../wp-fast-table/state/wp-table-pagination.service';
import {WorkPackageTablePagination} from '../../wp-fast-table/wp-table-pagination';

angular
  .module('openproject.workPackages.directives')
  .directive('tablePagination', tablePagination);

function tablePagination(PaginationService:any,
                         states:States,
                         wpTablePagination:WorkPackageTablePaginationService,
                         I18n:op.I18n) {
  return {
    restrict: 'EA',
    templateUrl: '/components/wp-table/table-pagination/table-pagination.directive.html',

    scope: {},

    link: function(scope:any) {
      PaginationService.loadPerPageOptions();

      scope.I18n = I18n;
      scope.paginationOptions = PaginationService.getPaginationOptions();
      scope.text = {
        label_previous: I18n.t('js.pagination.pages.previous'),
        label_next: I18n.t('js.pagination.pages.next'),
        per_page: I18n.t('js.label_per_page'),
        no_other_page: I18n.t('js.pagination.no_other_page')
      };

      scope.selectPerPage = function(perPage:number){
        wpTablePagination.updateFromObject({page: 1, perPage: perPage});
     };

      scope.showPage = function(pageNumber:number){
        wpTablePagination.updateFromObject({page: pageNumber});
      };

      Object.defineProperty(scope, 'perPageOptions', {
        get: () => PaginationService.getPerPageOptions()
      });

      /**
       * @name updateCurrentRange
       *
       * @description Defines a string containing page bound information inside the directive scope
       */
      function updateCurrentRangeLabel() {
        if (scope.totalEntries) {
          scope.currentRange = '(' + PaginationService.getLowerPageBound() + ' - ' + PaginationService.getUpperPageBound(scope.totalEntries) + '/' + scope.totalEntries + ')';
        } else {
          scope.currentRange = '(0 - 0/0)';
        }
      }

      /**
       * @name updatePageNumbers
       *
       * @description Defines a list of all pages in numerical order inside the scope
       */
      function updatePageNumbers() {
        var maxVisible = PaginationService.getMaxVisiblePageOptions();
        var truncSize = PaginationService.getOptionsTruncationSize();

        var pageNumbers = [];

        if (scope.paginationOptions.perPage) {
          for (var i = 1; i <= Math.ceil(scope.totalEntries / scope.paginationOptions.perPage); i++) {
            pageNumbers.push(i);
          }
        }

        // This avoids a truncation when there are not enough elements to truncate for the first elements
        var startingDiff = PaginationService.getPage() - 2 * truncSize;
        if ( 0 <= startingDiff && startingDiff <= 1 ) {
          scope.postPageNumbers = truncatePageNums(pageNumbers, pageNumbers.length >= maxVisible + (truncSize * 2), maxVisible + truncSize, pageNumbers.length, 0);
        }
        else {
          scope.prePageNumbers = truncatePageNums(pageNumbers, PaginationService.getPage() >= maxVisible, 0, Math.min(PaginationService.getPage() - Math.ceil(maxVisible / 2), pageNumbers.length - maxVisible), truncSize);
          scope.postPageNumbers = truncatePageNums(pageNumbers, pageNumbers.length >= maxVisible + (truncSize * 2), maxVisible, pageNumbers.length, 0);
        }

        scope.pageNumbers = pageNumbers;
      }

      function truncatePageNums(pageNumbers:any, perform:any, disectFrom:any, disectLength:any, truncateFrom:any) {
        if (perform) {
          var truncationSize = PaginationService.getOptionsTruncationSize();
          var truncatedNums = pageNumbers.splice(disectFrom, disectLength);
          if (truncatedNums.length >= truncationSize * 2) {
            truncatedNums.splice(truncateFrom, truncatedNums.length - truncationSize);
          }
          return truncatedNums;
        } else {
          return [];
        }
      }

      wpTablePagination.observeOnScope(scope).subscribe((wpPagination:WorkPackageTablePagination) => {
        scope.totalEntries = wpPagination.total;

        PaginationService.setPerPage(wpPagination.current.perPage);
        PaginationService.setPage(wpPagination.current.page);

        updateCurrentRangeLabel();
        updatePageNumbers();
      });
    }
  };
}