From 262c940ad5e845aa14196fc32dc8231f5f7dafb4 Mon Sep 17 00:00:00 2001
From: ruff <ruff@thor>
Date: Sun, 1 Oct 2023 11:33:24 +0200
Subject: [PATCH] Added callback method when instanciating the internal
 PDF-Engine

---
 src/ZugferdVisualizer.php          | 38 ++++++++++++++++++++++++------
 tests/testcases/VisualizerText.php | 36 ++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+), 7 deletions(-)

diff --git a/src/ZugferdVisualizer.php b/src/ZugferdVisualizer.php
index cf4b7de..a1499e9 100644
--- a/src/ZugferdVisualizer.php
+++ b/src/ZugferdVisualizer.php
@@ -83,6 +83,14 @@ class ZugferdVisualizer
      */
     protected $pdfPaperSize = "A4-P";
 
+    /**
+     * A callbacl which is called when MPDF is instanciated. Here
+     * is the possibillity to set custom options for MPDF
+     *
+     * @var callable|null
+     */
+    protected $mpdfInitCallback = null;
+
     /**
      * Constructor
      *
@@ -171,6 +179,18 @@ public function setPdfPaperSize(string $pdfPaperSize): void
         }
     }
 
+    /**
+     * Set the callback which is called after the internal instance
+     * of the PDF-Engine is instanciated
+     *
+     * @param callable $callback
+     * @return void
+     */
+    public function setPdfInitCallback(callable $callback): void
+    {
+        $this->mpdfInitCallback = $callback;
+    }
+
     /**
      * Renders the markup (HTML)
      *
@@ -273,16 +293,20 @@ private function instanciatePdfEngine(): Mpdf
 
         $pdf = new Mpdf(
             [
-            'tempDir' => sys_get_temp_dir() . '/mpdf',
-            'fontDir' => array_merge($defaultFontDirs, $this->pdfFontDirectories),
-            'fontdata' => $defaultFontData + $this->pdfFontData,
-            'default_font' => $this->pdfFontDefault,
-            'format' => $this->pdfPaperSize,
-            'PDFA' => true,
-            'PDFAauto' => true,
+                'tempDir' => sys_get_temp_dir() . '/mpdf',
+                'fontDir' => array_merge($defaultFontDirs, $this->pdfFontDirectories),
+                'fontdata' => $defaultFontData + $this->pdfFontData,
+                'default_font' => $this->pdfFontDefault,
+                'format' => $this->pdfPaperSize,
+                'PDFA' => true,
+                'PDFAauto' => true,
             ]
         );
 
+        if (is_callable($this->mpdfInitCallback)) {
+            call_user_func($this->mpdfInitCallback, $pdf, $this);
+        }
+
         return $pdf;
     }
 }
diff --git a/tests/testcases/VisualizerText.php b/tests/testcases/VisualizerText.php
index 38c98ab..f69af69 100644
--- a/tests/testcases/VisualizerText.php
+++ b/tests/testcases/VisualizerText.php
@@ -8,6 +8,7 @@
 use horstoeko\zugferdvisualizer\renderer\ZugferdVisualizerDefaultRenderer;
 use horstoeko\zugferdvisualizer\tests\TestCase;
 use horstoeko\zugferdvisualizer\ZugferdVisualizer;
+use Mpdf\Mpdf;
 
 class VisualizerText extends TestCase
 {
@@ -316,4 +317,39 @@ public function testRenderPdfFileWithDefaultTemplate(): void
 
         $this->assertTrue(file_exists($toFilename));
     }
+
+    /**
+     * @covers \horstoeko\zugferdvisualizer\ZugferdVisualizer::setPdfInitCallback
+     * @covers \horstoeko\zugferdvisualizer\ZugferdVisualizer::renderMarkup
+     * @covers \horstoeko\zugferdvisualizer\ZugferdVisualizer::renderPdf
+     * @covers \horstoeko\zugferdvisualizer\ZugferdVisualizer::renderPdfFile
+     * @covers \horstoeko\zugferdvisualizer\ZugferdVisualizer::testMustUseDefaultRenderer
+     * @covers \horstoeko\zugferdvisualizer\ZugferdVisualizer::testTemplateIsSet
+     * @covers \horstoeko\zugferdvisualizer\ZugferdVisualizer::testTemplateExists
+     * @covers \horstoeko\zugferdvisualizer\ZugferdVisualizer::instanciatePdfEngine
+     * @covers \horstoeko\zugferdvisualizer\renderer\ZugferdVisualizerDefaultRenderer::render
+     */
+    public function testPdfInitCallback(): void
+    {
+        $oldPdfVersion = "";
+        $newPdfVersion = "";
+
+        $visualizer = new ZugferdVisualizer(static::$document);
+        $visualizer->setDefaultTemplate();
+        $visualizer->setPdfInitCallback(function (Mpdf $mpdf, ZugferdVisualizer $visualizer) use (&$oldPdfVersion, &$newPdfVersion) {
+            $oldPdfVersion = $mpdf->pdf_version;
+            $mpdf->pdf_version = "1.7";
+            $newPdfVersion = $mpdf->pdf_version;
+        });
+
+        $toFilename = dirname(__FILE__) . "/invoice.pdf";
+
+        $this->registerFileForTestMethodTeardown($toFilename);
+
+        $visualizer->renderPdfFile($toFilename);
+
+        $this->assertTrue(file_exists($toFilename));
+        $this->assertEquals("1.4", $oldPdfVersion);
+        $this->assertEquals("1.7", $newPdfVersion);
+    }
 }