[books] Fix resume reading link and page calc

vrobbler/apps/scrobbles/views.py

@@ -768,7 +768,25 @@ def scrobble_start(request, uuid):
     scrobble = None
     user_id = request.user.id
     if media_obj:
-        media_obj.scrobble_for_user(user_id)
+        log_data = None
+        if (
+            request.GET.get("resume")
+            and media_obj.__class__.__name__ == Scrobble.MediaType.BOOK
+        ):
+            last_scrobble = (
+                Scrobble.objects.filter(
+                    book=media_obj,
+                    user_id=user_id,
+                )
+                .filter(Q(long_play_complete=False) | Q(long_play_complete__isnull=True))
+                .filter(log__page_end__isnull=False)
+                .order_by("-timestamp")
+                .first()
+            )
+            if last_scrobble and last_scrobble.logdata:
+                next_page = last_scrobble.logdata.page_end + 1
+                log_data = {"page_start": next_page}
+        media_obj.scrobble_for_user(user_id, log=log_data)
 
     if scrobble:
         messages.add_message(