From 334883dd265d8aafd1a8a3572101c5dd0b772f38 Mon Sep 17 00:00:00 2001
From: Claus Lohmar <claus.lohmar@lohmar.co.uk>
Date: Thu, 23 Jul 2026 08:12:21 +0000
Subject: [PATCH] fix: show download progress bar percentage when
 content_length is known

Previously always showed indeterminate spinner (pct=0) because
total size was unknown. Now if the HEAD request returns
Content-Length, the progress bar fills proportionally.
---
 frontend/templates/index.html | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/frontend/templates/index.html b/frontend/templates/index.html
index b006d78..b90ee5f 100644
--- a/frontend/templates/index.html
+++ b/frontend/templates/index.html
@@ -218,7 +218,10 @@ async function handleDownload(formData) {
         let label = 'Downloading source file... ' + gb + ' GiB';
         if (pdata.speed_mbps) label += ' (' + pdata.speed_mbps + ' MB/s)';
         if (pdata.eta) label += ' — ' + pdata.eta;
-        setPhase(label, 0, true);
+        // Show percentage if we know total size
+        const totalGb = pdata.content_length_gb;
+        const pct = totalGb ? Math.round((pdata.file_size_gb / totalGb) * 100) : 0;
+        setPhase(label, pct, totalGb ? false : true);
       }
     } catch (_) { /* keep polling */ }
   }