From 68fcf7c533ba7612c94760b1171c506f64bfc0ae Mon Sep 17 00:00:00 2001
From: Brian Kim <brian@tagg.id>
Date: Tue, 1 Jun 2021 14:43:30 -0700
Subject: Filled out basic front-end, need to integrate with back-end

---
 src/utils/common.ts | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'src/utils')

diff --git a/src/utils/common.ts b/src/utils/common.ts
index 95e77f64..9d0de64b 100644
--- a/src/utils/common.ts
+++ b/src/utils/common.ts
@@ -101,6 +101,27 @@ export const haveUnreadNotifications = async (
   return false;
 };
 
+export const getUnreadNotifications = async (
+  notifications: NotificationType[],
+): Promise<NotificationType[]> => {
+  const outputNotifications = [];
+  for (const n of notifications) {
+    const notificationDate = moment(n.timestamp);
+    const prevLastViewed = await AsyncStorage.getItem('notificationLastViewed');
+    const lastViewed: moment.Moment | undefined =
+      prevLastViewed == null ? moment.unix(0) : moment(prevLastViewed);
+    const dateAge = getDateAge(notificationDate);
+    if (dateAge === 'unknown') {
+      continue;
+    }
+    const unread = lastViewed ? lastViewed.diff(notificationDate) < 0 : false;
+    if (unread) {
+      outputNotifications.push(n);
+    }
+  }
+  return outputNotifications;
+};
+
 // https://stackoverflow.com/a/2450976
 export const shuffle = (array: any[]) => {
   var currentIndex = array.length,
@@ -197,3 +218,7 @@ export const validateImageLink = async (url: string | undefined) => {
       return false;
     });
 };
+
+export const numberWithCommas = (digits: number) => {
+  return digits.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',');
+};
-- 
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