Save seen listings in localStorage

web/lib/api.js

@@ -25,7 +25,16 @@ export const loadProperties = ({
     //credentials: 'include'
   });
 
-  //const body = await res.text();
-  //return JSON.parse(body);
 }
 
+export const markSeen = (id) => {
+  const seen = JSON.parse(window.localStorage.getItem('seen') || '[]');
+  seen.push(id);
+  window.localStorage.setItem('seen', JSON.stringify(seen));
+}
+
+export const loadSeen = (id) => {
+  const seen = JSON.parse(window.localStorage.getItem('seen') || '[]');
+  return seen;
+  //return seen.findIndex(s => s === id) !== -1;
+}