feat(medication): improve snooze timer handling

utils/doseStatus.ts

@@ -0,0 +1,35 @@
+import { DoseStatus } from '../types';
+
+export interface DoseStatusParams {
+  takenAt?: string;
+  snoozedUntil?: string;
+  scheduledTime: Date;
+  now: Date;
+}
+
+export const determineDoseStatus = ({
+  takenAt,
+  snoozedUntil,
+  scheduledTime,
+  now,
+}: DoseStatusParams): DoseStatus => {
+  if (takenAt) {
+    return DoseStatus.TAKEN;
+  }
+
+  if (snoozedUntil) {
+    const snoozeTime = new Date(snoozedUntil);
+    if (!Number.isNaN(snoozeTime.getTime())) {
+      if (snoozeTime.getTime() > now.getTime()) {
+        return DoseStatus.SNOOZED;
+      }
+      return DoseStatus.UPCOMING;
+    }
+  }
+
+  if (scheduledTime.getTime() < now.getTime()) {
+    return DoseStatus.MISSED;
+  }
+
+  return DoseStatus.UPCOMING;
+};