/**
 * Displays a table of courses and a pagination control.
 */
define(function(require) {
    'use strict';

    var $ = require('jquery'),
        _ = require('underscore'),
        Backgrid = require('backgrid'),
        ListTableView = require('components/generic-list/list/views/table'),

        CourseListBaseHeaderCell = require('course-list/list/views/base-header-cell'),
        CourseIdAndNameCell = require('course-list/list/views/course-id-and-name-cell'),
        courseListTableTemplate = require('course-list/list/templates/table.underscore'),
        notAvailableTemplate = require('course-list/list/templates/table-data-not-available.underscore'),
        Utils = require('utils/utils'),

        INTEGER_COLUMNS = ['count', 'cumulative_count', 'count_change_7_days', 'verified_enrollment', 'passing_users'],
        DATE_COLUMNS = ['start_date', 'end_date'],
        CourseListTableView;

    // This attached to Backgrid.Extensions.MomentCell
    require('backgrid-moment-cell');

    CourseListTableView = ListTableView.extend({
        template: _.template(courseListTableTemplate),
        regions: {
            table: '.course-list-table',
            paginator: '.course-list-paging-footer'
        },
        buildColumns: function() {
            return _.map(this.options.collection.sortableFields, function(val, key) {
                var column = this.createDefaultColumn(val.displayName, key);
                column.headerCell = CourseListBaseHeaderCell;
                if (INTEGER_COLUMNS.indexOf(key) !== -1) {
                    column.cell = 'integer';
                    column.sortValue = key; // reset to normal sorting for integer columns
                } else if (DATE_COLUMNS.indexOf(key) !== -1) {
                    column.cell = Backgrid.Extension.MomentCell.extend({
                        displayLang: Utils.getMomentLocale(),
                        displayFormat: 'L',
                        render: function() {
                            var result = Backgrid.Extension.MomentCell.prototype.render.call(this, arguments);
                            // Null values are rendered by MomentCell as "Invalid date". Convert to a nicer string:
                            if (result.el.textContent === 'Invalid date') {
                                // render the nicer text and screen reader only text
                                $(result.el).html(_.template(notAvailableTemplate)({
                                    srText: gettext('Date not available')
                                }));
                            }
                            return result;
                        }
                    });
                } else if (key === 'catalog_course_title') {
                    column.cell = CourseIdAndNameCell;
                } else {
                    column.cell = 'string';
                }

                return column;
            }, this);
        }
    });

    return CourseListTableView;
});
