From ee08cb0c29b707867935f7a87115520d11fa6a8d Mon Sep 17 00:00:00 2001
From: Dotty Dotter <dotty@Mac-mini-von-Dotty.local>
Date: Fri, 10 Apr 2026 18:40:13 +0200
Subject: [PATCH] Quellen-Seite: PDF-Thumbnails der ersten Seite +
 Thumbnail-API-Endpoint

---
 app/main.py                | 31 +++++++++++++++++++++++++++++++
 app/templates/quellen.html | 24 +++++++++++++++++++-----
 2 files changed, 50 insertions(+), 5 deletions(-)

diff --git a/app/main.py b/app/main.py
index 21d9b04..6c0a330 100644
--- a/app/main.py
+++ b/app/main.py
@@ -875,6 +875,37 @@ neu analysiert, um verifizierte Zitate zu erzeugen.</p>
     )
 
 
+@app.get("/api/programme/thumbnail/{programm_id}")
+async def programme_thumbnail(programm_id: str):
+    """Thumbnail der ersten Seite eines Wahlprogramm-PDFs (PNG, 200px breit).
+
+    Wird auf der Quellen-Seite als Vorschau angezeigt. Cached 24h.
+    """
+    import fitz
+    if programm_id not in PROGRAMME:
+        raise HTTPException(status_code=404)
+    info = PROGRAMME[programm_id]
+    pdf_path = static_dir / "referenzen" / info["pdf"]
+    if not pdf_path.exists():
+        raise HTTPException(status_code=404)
+    try:
+        doc = fitz.open(str(pdf_path))
+        page = doc[0]
+        # 200px Breite, proportional skaliert
+        zoom = 200 / page.rect.width
+        mat = fitz.Matrix(zoom, zoom)
+        pix = page.get_pixmap(matrix=mat)
+        png_bytes = pix.tobytes("png")
+        doc.close()
+        return Response(
+            content=png_bytes,
+            media_type="image/png",
+            headers={"Cache-Control": "public, max-age=86400"},
+        )
+    except Exception:
+        raise HTTPException(status_code=500)
+
+
 @app.get("/api/programme")
 async def list_programme():
     """List all available programmes."""
diff --git a/app/templates/quellen.html b/app/templates/quellen.html
index 7df3ccb..cb446d6 100644
--- a/app/templates/quellen.html
+++ b/app/templates/quellen.html
@@ -221,7 +221,13 @@
         <h2>Wahlprogramme NRW 2022</h2>
         <div class="programme-grid">
             {% for prog in programmes if prog.typ == 'wahlprogramm' %}
-            <div class="programme-card">
+            <div class="programme-card" style="display: flex; gap: 1rem;">
+                <a href="{{ prog.pdf_url }}" target="_blank" style="flex-shrink: 0;">
+                    <img src="/api/programme/thumbnail/{{ prog.id }}" alt="{{ prog.name }}"
+                         style="width: 80px; border: 1px solid #ddd; border-radius: 4px;"
+                         loading="lazy" onerror="this.style.display='none'">
+                </a>
+                <div>
                 <h3>
                     <span class="programme-badge badge-{{ prog.partei|lower }}">{{ prog.partei }}</span>
                     {{ prog.name }}
@@ -230,7 +236,7 @@
                     <span class="programme-badge badge-wahlprogramm">Wahlprogramm</span>
                     {% if prog.bundesland %}{{ prog.bundesland }}{% endif %}
                 </div>
-                <div style="margin-top: 1rem;">
+                <div style="margin-top: 0.5rem;">
                     <a href="{{ prog.pdf_url }}" target="_blank" class="btn btn-primary">
                         📄 PDF herunterladen
                     </a>
@@ -240,14 +246,21 @@
                     </span>
                     {% endfor %}
                 </div>
+                </div>
             </div>
             {% endfor %}
         </div>
-        
+
         <h2>Grundsatzprogramme</h2>
         <div class="programme-grid">
             {% for prog in programmes if prog.typ == 'parteiprogramm' %}
-            <div class="programme-card">
+            <div class="programme-card" style="display: flex; gap: 1rem;">
+                <a href="{{ prog.pdf_url }}" target="_blank" style="flex-shrink: 0;">
+                    <img src="/api/programme/thumbnail/{{ prog.id }}" alt="{{ prog.name }}"
+                         style="width: 80px; border: 1px solid #ddd; border-radius: 4px;"
+                         loading="lazy" onerror="this.style.display='none'">
+                </a>
+                <div>
                 <h3>
                     <span class="programme-badge badge-{{ prog.partei|lower }}">{{ prog.partei }}</span>
                     {{ prog.name }}
@@ -255,7 +268,7 @@
                 <div class="programme-meta">
                     <span class="programme-badge badge-parteiprogramm">Grundsatzprogramm</span>
                 </div>
-                <div style="margin-top: 1rem;">
+                <div style="margin-top: 0.5rem;">
                     <a href="{{ prog.pdf_url }}" target="_blank" class="btn btn-primary">
                         📄 PDF herunterladen
                     </a>
@@ -265,6 +278,7 @@
                     </span>
                     {% endfor %}
                 </div>
+                </div>
             </div>
             {% endfor %}
         </div>