feat(files_reminders): add datetime utils

Signed-off-by: Christopher Ng <chrng8@gmail.com>
(cherry picked from commit e97206bb06)

apps/files_reminders/src/shared/utils.ts

@@ -0,0 +1,112 @@
+/**
+ * @copyright 2023 Christopher Ng <chrng8@gmail.com>
+ *
+ * @author Christopher Ng <chrng8@gmail.com>
+ *
+ * @license AGPL-3.0-or-later
+ *
+ * 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/>.
+ *
+ */
+
+import moment from '@nextcloud/moment'
+import { getCanonicalLocale } from '@nextcloud/l10n'
+
+export enum DateTimePreset {
+	LaterToday,
+	Tomorrow,
+	ThisWeekend,
+	NextWeek,
+}
+
+export const getDateTime = (dateTime: DateTimePreset): Date => {
+	const matchPreset = {
+		[DateTimePreset.LaterToday]: () => {
+			const hour = moment().get('hour')
+			const later = moment()
+				.startOf('day')
+				.add(hour + 2, 'hour')
+			return later.toDate()
+		},
+
+		[DateTimePreset.Tomorrow]: () => {
+			const day = moment()
+				.add(1, 'day')
+				.startOf('day')
+				.add(9, 'hour')
+				.toDate()
+			return day
+		},
+
+		[DateTimePreset.ThisWeekend]: () => {
+			const today = moment()
+			const weekendFirstDay = moment()
+				.startOf('isoWeek')
+				.add(5, 'day')
+				.add(9, 'hour')
+			const weekendSecondDay = moment()
+				.startOf('isoWeek')
+				.add(6, 'day')
+				.add(9, 'hour')
+			if (today.isSame(weekendFirstDay, 'date')) {
+				return weekendFirstDay
+					.add(1, 'day')
+					.toDate()
+			}
+			if (today.isSame(weekendSecondDay, 'date')) {
+				return weekendSecondDay
+					.add(1, 'week')
+					.startOf('isoWeek')
+					.add(5, 'day')
+					.add(9, 'hour')
+					.toDate()
+			}
+			return weekendFirstDay.toDate()
+		},
+
+		[DateTimePreset.NextWeek]: () => {
+			const day = moment()
+				.startOf('isoWeek')
+				.add(1, 'week')
+				.add(9, 'hour')
+				.toDate()
+			return day
+		},
+	}
+
+	return matchPreset[dateTime]()
+}
+
+export const getDateString = (dueDate: Date): string => {
+	let localeOptions: Intl.DateTimeFormatOptions = {
+		weekday: 'short',
+		hour: 'numeric',
+		minute: '2-digit',
+	}
+
+	const today = moment()
+	const dueDateMoment = moment(dueDate)
+	if (!dueDateMoment.isSame(today, 'week')) {
+		localeOptions = {
+			...localeOptions,
+			month: 'short',
+			day: 'numeric',
+		}
+	}
+
+	return dueDate.toLocaleString(
+		getCanonicalLocale(),
+		localeOptions,
+	)
+}