1 files changed, 14 insertions, 1 deletions
diff --git a/ui/src/utils.ts b/ui/src/utils.ts
index 02c1afbf..1d490a30 100644
--- a/ui/src/utils.ts
+++ b/ui/src/utils.ts
@@ -1,4 +1,4 @@
-import { UserOperation } from './interfaces';
+import { UserOperation, Comment } from './interfaces';
 
 export let repoUrl = 'https://github.com/dessalines/rust-reddit-fediverse';
 export let wsUri = (window.location.protocol=='https:'&&'wss://'||'ws://')+window.location.host + '/service/ws/';
@@ -8,3 +8,16 @@ export function msgOp(msg: any): UserOperation {
   return UserOperation[opStr];
 }
 
+export function hotRank(comment: Comment): number {
+  // Rank = ScaleFactor * sign(Score) * log(1 + abs(Score)) / (Time + 2)^Gravity
+
+  let date: Date = new Date(comment.published + 'Z'); // Add Z to convert from UTC date
+  let now: Date = new Date();
+  let hoursElapsed: number = (now.getTime() - date.getTime()) / 36e5;
+
+  let rank = (10000 * Math.sign(comment.score) * Math.log10(1 + Math.abs(comment.score))) / Math.pow(hoursElapsed + 2, 1.8);
+
+  // console.log(`Comment: ${comment.content}\nRank: ${rank}\nScore: ${comment.score}\nHours: ${hoursElapsed}`);
+
+  return rank;
+}