From 266b9dfad39ffc9fc02cd1298db270a390111ea8 Mon Sep 17 00:00:00 2001
From: Benjamin Admin <benjaminadmin@MacBook-Pro.fritz.box>
Date: Sat, 28 Feb 2026 21:13:26 +0100
Subject: [PATCH] Fix PDF 404: default to bp_compliance_ce collection, add PDF
 existence check

Default collection changed from bp_compliance_gesetze (DE/AT/CH laws where
PDFs need manual download) to bp_compliance_ce (EU regulations where PDFs
are auto-downloaded). Added HEAD request check so missing PDFs show a clear
"PDF nicht vorhanden" message instead of a 404 in the iframe.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 .../ai/rag/components/ChunkBrowserQA.tsx      | 36 ++++++++++++++++---
 1 file changed, 31 insertions(+), 5 deletions(-)

diff --git a/admin-lehrer/app/(admin)/ai/rag/components/ChunkBrowserQA.tsx b/admin-lehrer/app/(admin)/ai/rag/components/ChunkBrowserQA.tsx
index 854a8f3..2a48a3a 100644
--- a/admin-lehrer/app/(admin)/ai/rag/components/ChunkBrowserQA.tsx
+++ b/admin-lehrer/app/(admin)/ai/rag/components/ChunkBrowserQA.tsx
@@ -53,8 +53,11 @@ export function ChunkBrowserQA({ apiProxy }: ChunkBrowserQAProps) {
   const [splitViewActive, setSplitViewActive] = useState(true)
   const [chunksPerPage, setChunksPerPage] = useState(6)
 
-  // Collection
-  const [collection, setCollection] = useState('bp_compliance_gesetze')
+  // Collection — default to bp_compliance_ce where we have PDFs downloaded
+  const [collection, setCollection] = useState('bp_compliance_ce')
+
+  // PDF existence check
+  const [pdfExists, setPdfExists] = useState<boolean | null>(null)
 
   // Sidebar collapsed groups
   const [collapsedGroups, setCollapsedGroups] = useState<Set<string>>(new Set())
@@ -204,6 +207,17 @@ export function ChunkBrowserQA({ apiProxy }: ChunkBrowserQAProps) {
   const pdfMapping = selectedRegulation ? RAG_PDF_MAPPING[selectedRegulation] : null
   const pdfUrl = pdfMapping ? `/rag-originals/${pdfMapping.filename}#page=${pdfPage}` : null
 
+  // Check PDF existence when regulation changes
+  useEffect(() => {
+    if (!selectedRegulation) { setPdfExists(null); return }
+    const mapping = RAG_PDF_MAPPING[selectedRegulation]
+    if (!mapping) { setPdfExists(false); return }
+    const url = `/rag-originals/${mapping.filename}`
+    fetch(url, { method: 'HEAD' })
+      .then(res => setPdfExists(res.ok))
+      .catch(() => setPdfExists(false))
+  }, [selectedRegulation])
+
   // Handlers
   const handleSelectRegulation = (code: string) => {
     setSelectedRegulation(code)
@@ -602,7 +616,7 @@ export function ChunkBrowserQA({ apiProxy }: ChunkBrowserQAProps) {
                   </div>
                 </div>
                 <div className="flex-1 min-h-0 relative">
-                  {pdfUrl ? (
+                  {pdfUrl && pdfExists ? (
                     <iframe
                       key={`${selectedRegulation}-${pdfPage}`}
                       src={pdfUrl}
@@ -613,8 +627,20 @@ export function ChunkBrowserQA({ apiProxy }: ChunkBrowserQAProps) {
                     <div className="flex items-center justify-center h-full text-slate-400 text-sm p-4">
                       <div className="text-center space-y-2">
                         <div className="text-3xl">&#128196;</div>
-                        <p>Kein PDF-Mapping fuer {selectedRegulation}.</p>
-                        <p className="text-xs">rag-pdf-mapping.ts ergaenzen und PDF in ~/rag-originals/ ablegen.</p>
+                        {!pdfMapping ? (
+                          <>
+                            <p>Kein PDF-Mapping fuer {selectedRegulation}.</p>
+                            <p className="text-xs">rag-pdf-mapping.ts ergaenzen.</p>
+                          </>
+                        ) : pdfExists === false ? (
+                          <>
+                            <p className="font-medium text-orange-600">PDF nicht vorhanden</p>
+                            <p className="text-xs">Datei <code className="bg-slate-100 px-1 rounded">{pdfMapping.filename}</code> fehlt in ~/rag-originals/</p>
+                            <p className="text-xs mt-1">Bitte manuell herunterladen und dort ablegen.</p>
+                          </>
+                        ) : (
+                          <p>PDF wird geprueft...</p>
+                        )}
                       </div>
                     </div>
                   )}