feat: add signing reminder

packages/lib/utils/should-send-reminder.ts

@@ -0,0 +1,49 @@
+import { DateTime } from 'luxon';
+
+import { ReminderInterval } from '@documenso/prisma/client';
+
+export type ShouldSendReminderOptions = {
+  reminderInterval: ReminderInterval;
+  lastReminderSentAt: Date | null;
+  now: Date;
+};
+
+export const shouldSendReminder = ({
+  lastReminderSentAt,
+  now = new Date(),
+  reminderInterval,
+}: ShouldSendReminderOptions): boolean => {
+  if (!lastReminderSentAt) {
+    return true;
+  }
+
+  const hoursSinceLastReminder = DateTime.fromJSDate(now).diff(
+    DateTime.fromJSDate(lastReminderSentAt),
+    'hours',
+  ).hours;
+  const monthsSinceLastReminder = DateTime.fromJSDate(now).diff(
+    DateTime.fromJSDate(lastReminderSentAt),
+    'months',
+  ).months;
+
+  switch (reminderInterval) {
+    case ReminderInterval.EVERY_1_HOUR:
+      return hoursSinceLastReminder >= 1;
+    case ReminderInterval.EVERY_6_HOURS:
+      return hoursSinceLastReminder >= 6;
+    case ReminderInterval.EVERY_12_HOURS:
+      return hoursSinceLastReminder >= 12;
+    case ReminderInterval.DAILY:
+      return hoursSinceLastReminder >= 24;
+    case ReminderInterval.EVERY_3_DAYS:
+      return hoursSinceLastReminder >= 72;
+    case ReminderInterval.WEEKLY:
+      return hoursSinceLastReminder >= 168;
+    case ReminderInterval.EVERY_2_WEEKS:
+      return hoursSinceLastReminder >= 336;
+    case ReminderInterval.MONTHLY:
+      return monthsSinceLastReminder >= 1;
+    default:
+      return false;
+  }
+};