1 files changed, 162 insertions, 0 deletions
diff --git a/apps/files_reminders/src/shared/utils.ts b/apps/files_reminders/src/shared/utils.ts
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index 00000000000..5d583ad3ddd
--- /dev/null
+++ b/apps/files_reminders/src/shared/utils.ts
@@ -0,0 +1,162 @@
+/**
+ * SPDX-FileCopyrightText: 2023 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+import { getCanonicalLocale } from '@nextcloud/l10n'
+
+export enum DateTimePreset {
+	LaterToday = 'later-today',
+	Tomorrow = 'tomorrow',
+	ThisWeekend = 'this-weekend',
+	NextWeek = 'next-week',
+}
+
+const getFirstWorkdayOfWeek = () => {
+	const now = new Date()
+	now.setHours(0, 0, 0, 0)
+	now.setDate(now.getDate() - now.getDay() + 1)
+	return new Date(now)
+}
+
+const getWeek = (date: Date) => {
+	const dateClone = new Date(date)
+	dateClone.setHours(0, 0, 0, 0)
+	const firstDayOfYear = new Date(date.getFullYear(), 0, 1, 0, 0, 0, 0)
+	const daysFromFirstDay = (date.getTime() - firstDayOfYear.getTime()) / 86400000
+	return Math.ceil((daysFromFirstDay + firstDayOfYear.getDay() + 1) / 7)
+}
+
+const isSameWeek = (a: Date, b: Date) => {
+	return getWeek(a) === getWeek(b)
+		&& a.getFullYear() === b.getFullYear()
+}
+
+const isSameDate = (a: Date, b: Date) => {
+	return a.getDate() === b.getDate()
+		&& a.getMonth() === b.getMonth()
+		&& a.getFullYear() === b.getFullYear()
+}
+
+export const getDateTime = (dateTime: DateTimePreset): null | Date => {
+	const matchPreset: Record<DateTimePreset, () => null | Date> = {
+		[DateTimePreset.LaterToday]: () => {
+			const now = new Date()
+			const evening = new Date()
+			evening.setHours(18, 0, 0, 0)
+			const cutoff = new Date()
+			cutoff.setHours(17, 0, 0, 0)
+			if (now >= cutoff) {
+				return null
+			}
+			return evening
+		},
+
+		[DateTimePreset.Tomorrow]: () => {
+			const now = new Date()
+			const day = new Date()
+			day.setDate(now.getDate() + 1)
+			day.setHours(8, 0, 0, 0)
+			return day
+		},
+
+		[DateTimePreset.ThisWeekend]: () => {
+			const today = new Date()
+			if (
+				[
+					5, // Friday
+					6, // Saturday
+					0, // Sunday
+				].includes(today.getDay())
+			) {
+				return null
+			}
+			const saturday = new Date()
+			const firstWorkdayOfWeek = getFirstWorkdayOfWeek()
+			saturday.setDate(firstWorkdayOfWeek.getDate() + 5)
+			saturday.setHours(8, 0, 0, 0)
+			return saturday
+		},
+
+		[DateTimePreset.NextWeek]: () => {
+			const today = new Date()
+			if (today.getDay() === 0) { // Sunday
+				return null
+			}
+			const workday = new Date()
+			const firstWorkdayOfWeek = getFirstWorkdayOfWeek()
+			workday.setDate(firstWorkdayOfWeek.getDate() + 7)
+			workday.setHours(8, 0, 0, 0)
+			return workday
+		},
+	}
+
+	return matchPreset[dateTime]()
+}
+
+export const getInitialCustomDueDate = (): Date => {
+	const now = new Date()
+	const dueDate = new Date()
+	dueDate.setHours(now.getHours() + 2, 0, 0, 0)
+	return dueDate
+}
+
+export const getDateString = (dueDate: Date): string => {
+	let formatOptions: Intl.DateTimeFormatOptions = {
+		hour: 'numeric',
+		minute: '2-digit',
+	}
+
+	const today = new Date()
+
+	if (!isSameDate(dueDate, today)) {
+		formatOptions = {
+			...formatOptions,
+			weekday: 'short',
+		}
+	}
+
+	if (!isSameWeek(dueDate, today)) {
+		formatOptions = {
+			...formatOptions,
+			month: 'short',
+			day: 'numeric',
+		}
+	}
+
+	if (dueDate.getFullYear() !== today.getFullYear()) {
+		formatOptions = {
+			...formatOptions,
+			year: 'numeric',
+		}
+	}
+
+	return dueDate.toLocaleString(
+		getCanonicalLocale(),
+		formatOptions,
+	)
+}
+
+export const getVerboseDateString = (dueDate: Date): string => {
+	let formatOptions: Intl.DateTimeFormatOptions = {
+		month: 'long',
+		day: 'numeric',
+		weekday: 'long',
+		hour: 'numeric',
+		minute: '2-digit',
+	}
+
+	const today = new Date()
+
+	if (dueDate.getFullYear() !== today.getFullYear()) {
+		formatOptions = {
+			...formatOptions,
+			year: 'numeric',
+		}
+	}
+
+	return dueDate.toLocaleString(
+		getCanonicalLocale(),
+		formatOptions,
+	)
+}