From e62fbe9efee8372f4f68ad11bf396f1536ad12dd Mon Sep 17 00:00:00 2001
From: fds2610-bot <felix-bot@schepmann.de>
Date: Tue, 5 May 2026 15:29:50 +0200
Subject: [PATCH] Fix: Beleg referenziert Rechnung via invoice_id, serveFile
 leitet auf Rechnungs-PDF weiter

---
 migrations/043_belege_invoice_id.sql  | 6 ++++++
 src/Controllers/BelegController.php   | 6 ++++++
 src/Controllers/InvoiceController.php | 1 +
 src/Models/Beleg.php                  | 7 +++++--
 4 files changed, 18 insertions(+), 2 deletions(-)
 create mode 100644 migrations/043_belege_invoice_id.sql

diff --git a/migrations/043_belege_invoice_id.sql b/migrations/043_belege_invoice_id.sql
new file mode 100644
index 0000000..5272a79
--- /dev/null
+++ b/migrations/043_belege_invoice_id.sql
@@ -0,0 +1,6 @@
+ALTER TABLE belege
+  ADD COLUMN invoice_id INT UNSIGNED NULL DEFAULT NULL
+    COMMENT 'FK zur zugehörigen Ausgangsrechnung (wenn kein physischer Beleg)'
+    AFTER id,
+  ADD CONSTRAINT fk_belege_invoice
+    FOREIGN KEY (invoice_id) REFERENCES invoices(id) ON DELETE SET NULL;
diff --git a/src/Controllers/BelegController.php b/src/Controllers/BelegController.php
index e34fb1d..471cbfb 100644
--- a/src/Controllers/BelegController.php
+++ b/src/Controllers/BelegController.php
@@ -230,6 +230,12 @@ class BelegController
         $beleg = Beleg::find((int)$params['id']);
         if (!$beleg) { http_response_code(404); return; }
 
+        // Beleg ohne physische Datei → PDF der verknüpften Rechnung ausliefern
+        if (empty($beleg['storage_path']) && !empty($beleg['invoice_id'])) {
+            header('Location: /invoices/' . (int)$beleg['invoice_id'] . '/pdf');
+            exit;
+        }
+
         $absPath = dirname(__DIR__, 2) . '/public/' . $beleg['storage_path'];
         if (!file_exists($absPath)) { http_response_code(404); return; }
 
diff --git a/src/Controllers/InvoiceController.php b/src/Controllers/InvoiceController.php
index 81045c2..c6ad0b2 100644
--- a/src/Controllers/InvoiceController.php
+++ b/src/Controllers/InvoiceController.php
@@ -438,6 +438,7 @@ class InvoiceController
 
         $belegNr = Beleg::generateBelegNr();
         $belegId = Beleg::create([
+            'invoice_id'     => $id,
             'beleg_nr'       => $belegNr,
             'filename'       => $invoice['rechnungs_nr'] . '.pdf',
             'storage_path'   => '',
diff --git a/src/Models/Beleg.php b/src/Models/Beleg.php
index 4004430..080e3d5 100644
--- a/src/Models/Beleg.php
+++ b/src/Models/Beleg.php
@@ -100,11 +100,14 @@ class Beleg
             $fyId = $fy['id'];
         }
 
+        $invoiceId = isset($data['invoice_id']) && $data['invoice_id'] ? (int)$data['invoice_id'] : null;
+
         Database::execute(
-            'INSERT INTO belege (beleg_nr, filename, storage_path, mime_type, file_hash,
+            'INSERT INTO belege (invoice_id, beleg_nr, filename, storage_path, mime_type, file_hash,
              beleg_datum, rechnungs_nr, betrag_brutto, belegtyp, notes, fiscal_year_id)
-             VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)',
+             VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)',
             [
+                $invoiceId,
                 $data['beleg_nr'],
                 $data['filename'],
                 $data['storage_path'],