'use strict';
define(
    [
        'handlebars',
        'moment',
        'Shared/FormatHelpers',
        'Shared/UiSettingsModel'
    ], function (Handlebars, moment, FormatHelpers, UiSettings) {
        Handlebars.registerHelper('ShortDate', function (input) {
            if (!input) {
                return '';
            }

            var date = moment(input);
            var result = '<span title="' + date.format(UiSettings.longDateTime()) + '">' + date.format(UiSettings.get('shortDateFormat')) + '</span>';

            return new Handlebars.SafeString(result);
        });

        Handlebars.registerHelper('RelativeDate', function (input) {
            if (!input) {
                return '';
            }

            var date = moment(input);
            var result = '<span title="{0}">{1}</span>';
            var tooltip = date.format(UiSettings.longDateTime());
            var text;

            if (UiSettings.get('showRelativeDates')) {
                text = FormatHelpers.relativeDate(input);
            }

            else {
                text = date.format(UiSettings.get('shortDateFormat'));
            }

            result = result.format(tooltip, text);

            return new Handlebars.SafeString(result);
        });

        Handlebars.registerHelper('Day', function (input) {
            if (!input) {
                return '';
            }

            return moment(input).format('DD');
        });

        Handlebars.registerHelper('Month', function (input) {
            if (!input) {
                return '';
            }

            return moment(input).format('MMM');
        });

        Handlebars.registerHelper('StartTime', function (input) {
            if (!input) {
                return '';
            }

            return moment(input).format(UiSettings.time(false, false));
        });

        Handlebars.registerHelper('LTS', function (input) {
            if (!input) {
                return '';
            }

            return moment(input).format(UiSettings.time(true, true));
        });

        Handlebars.registerHelper('if_today', function(context, options) {
            var date = moment(context).startOf('day');
            var today = moment().startOf('day');


            if (date.isSame(today)) {
                return options.fn(this);
            }

            return options.inverse(this);
        });

        Handlebars.registerHelper('unless_today', function(context, options) {
            var date = moment(context).startOf('day');
            var today = moment().startOf('day');


            if (date.isSame(today)) {
                return options.inverse(this);
            }

            return options.fn(this);
        });
    });