# Add download size to offline media downloads

- Added getDownloadSize helper function to display media size
 in MB or GB when appropriate

utils/download.ts

@@ -4,6 +4,9 @@ import useImageStorage from "@/hooks/useImageStorage";
 import {apiAtom} from "@/providers/JellyfinProvider";
 import {useAtom} from "jotai";
 import {storage} from "@/utils/mmkv";
+import {getDownloadedFileUrl} from "@/hooks/useDownloadedFileOpener";
+import * as FileSystem from 'expo-file-system'
+import {FileInfo} from "expo-file-system";
 
 const useDownloadHelper = () => {
   const [api] = useAtom(apiAtom);
@@ -15,7 +18,29 @@ const useDownloadHelper = () => {
     }
   }
 
-  return { saveSeriesPrimaryImage }
+  const getDownloadSize = async (...items: BaseItemDto[]) => {
+    const sizes: number[] = [];
+
+    await Promise.all(items.map(item => {
+      return new Promise(async (resolve, reject) => {
+        const url = await getDownloadedFileUrl(item.Id!);
+        if (url) {
+          const fileInfo: FileInfo = await FileSystem.getInfoAsync(url);
+          sizes.push(fileInfo.size);
+          resolve(sizes);
+        } else reject();
+      })
+    }));
+
+    const size = sizes.reduce((sum, size) => sum + size, 0);
+    const gb = size / 1e+9;
+
+    if (gb >= 1)
+      return `${gb.toFixed(2)} GB`;
+    return `${(size / 1024 / 1024).toFixed(2)} MB`;
+  }
+
+  return { saveSeriesPrimaryImage, getDownloadSize }
 }
 
 export default useDownloadHelper;