From e8769fefb0ec0208a1a052f713b0f89530ac35f2 Mon Sep 17 00:00:00 2001
From: Nexmoe <16796652+nexmoe@users.noreply.github.com>
Date: Sun, 18 Jan 2026 13:34:39 +0800
Subject: [PATCH] fix(download): disambiguate duplicate playlist titles (#145)

---
 src/main/lib/download-engine.ts | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/src/main/lib/download-engine.ts b/src/main/lib/download-engine.ts
index 9eba4ba..c3a961c 100644
--- a/src/main/lib/download-engine.ts
+++ b/src/main/lib/download-engine.ts
@@ -628,16 +628,34 @@ class DownloadEngine extends EventEmitter {
       `Starting playlist download: ${selectionSize} items from "${playlistInfo.title}"`
     )
 
+    const normalizedTitles = new Set<string>()
+    let hasDuplicateTitles = false
+    for (const entry of selectedEntries) {
+      const key = sanitizeTemplateValue(entry.title || '').toLowerCase()
+      if (normalizedTitles.has(key)) {
+        hasDuplicateTitles = true
+        break
+      }
+      normalizedTitles.add(key)
+    }
+    const indexWidth = hasDuplicateTitles
+      ? String(Math.max(...selectedEntries.map((entry) => entry.index))).length
+      : 0
+
     // Create download items for each video in the playlist
     for (const entry of selectedEntries) {
       const downloadId = `${groupId}_${Math.random().toString(36).substring(2, 10)}`
+      const customFilenameTemplate = hasDuplicateTitles
+        ? `${String(entry.index).padStart(indexWidth, '0')} - %(title)s via VidBee.%(ext)s`
+        : undefined
 
       const downloadOptions: DownloadOptions = {
         url: entry.url,
         type: options.type,
         format: options.format,
         audioFormat: options.type === 'audio' ? options.format : undefined,
-        customDownloadPath: resolvedDownloadPath
+        customDownloadPath: resolvedDownloadPath,
+        customFilenameTemplate
       }
 
       const createdAt = Date.now()