Funcionando

.directory

@@ -1,5 +1,5 @@
 [Dolphin]
 HeaderColumnWidths=372,72,103
-Timestamp=2021,11,27,10,20,55
+Timestamp=2021,11,28,21,9,10
 Version=4
 ViewMode=1

app/Http/Controllers/LibrilladoraController.php

@@ -9,6 +9,6 @@ class LibrilladoraController extends Controller
     //
     public function __invoke($fileName, $size) {
         $lib = new Librilladora();
-        $lib->prueba($fileName, $size);
+        $lib->procesar($fileName, $size);
     }
 }

app/Models/Librilladora.php

@@ -5,25 +5,144 @@ namespace App\Models;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Support\Facades\File;
+use Symfony\Component\Console\Output\Output;
+
 
 class Librilladora extends Model {
     use HasFactory;
 
-
-    public function prueba($fileName, $size) {
+    public function procesar($fileName, $size) {
         $file = 'uploads/'.$fileName;
 
-        $mpdf = new \Mpdf\Mpdf();
-        $pagecount = $mpdf->SetSourceFile($file);
-        $fin = ($size < $pagecount) ? $size : $pagecount;
-        for ($i = 1; $i <= $fin; $i++) {
-            $tplId = $mpdf->importPage($i);
-            $mpdf->useTemplate($tplId);
-            if ($i != $fin) $mpdf->AddPage();
+        $mpdf = new \Mpdf\Mpdf([
+            'format' => 'A4-L',
+            'margin_left' => 0,
+            'margin_right' => 0,
+            'margin_top' => 0,
+            'margin_bottom' => 0,
+            'margin_header' => 0,
+            'margin_footer' => 0,
+        ]);
+
+        // DIVIDIR EL DOCUMENTO Y BOOKLETEAR LAS DIVISIONES
+        $pageCount = $mpdf->SetSourceFile($file);
+        $cantBooklets = ($pageCount / $size);
+        for ($i = 0; $i < $cantBooklets; $i++) {
+            $comienzo = ($size*$i)+1;
+            $fin = ($size*($i+1) < $pageCount) ? $size*($i+1) : $pageCount;
+            $docAux = new \Mpdf\Mpdf();
+            $docAux->SetSourceFile($file);
+            for ($j = $comienzo; $j <= $fin; $j++) {
+                $tplId = $docAux->importPage($j);
+                $docAux->useTemplate($tplId);
+                if ($j != $fin) $docAux->AddPage();
+            }
+            $docAux->Output('uploads/'.$i."-".$fileName, \Mpdf\Output\Destination::FILE);
+            $this->librillar('uploads/', $i."-".$fileName);
         }
 
-        $mpdf->Output();
-        File::delete($file);
+        // MERGEAR LAS DIVISIONES
+        $fileNames = array();
+        for ($i = 0; $i < $cantBooklets; $i++)
+            array_push($fileNames, 'uploads/librillo-'.$i."-".$fileName);
+        $this->mergePDFFiles($fileNames);
+    }
+
+
+    private function librillar($dir, $filename) {
+        $mpdf = new \Mpdf\Mpdf([
+        'format' => 'A4-L',
+        'margin_left' => 0,
+        'margin_right' => 0,
+        'margin_top' => 0,
+        'margin_bottom' => 0,
+        'margin_header' => 0,
+        'margin_footer' => 0,
+    ]);
+
+        $pw = $mpdf->w / 2;
+        $ph = $mpdf->h;
+
+        $mpdf->SetDisplayMode('fullpage');
+
+        $pagecount = $mpdf->SetSourceFile($dir.$filename);
+        $pp = $this->GetBookletPages($pagecount);
+
+        foreach ($pp as $v) {
+
+            $mpdf->AddPage();
+
+            if ($v[0] > 0 && $v[0] <= $pagecount) {
+                $tplIdx = $mpdf->ImportPage($v[0]); //, 0, 0, $ow, $oh
+                $mpdf->UseTemplate($tplIdx, 0, 0, $pw, $ph);
+            }
+
+            if ($v[1] > 0 && $v[1] <= $pagecount) {
+                $tplIdx = $mpdf->ImportPage($v[1]); //, 0, 0, $ow, $oh
+                $mpdf->UseTemplate($tplIdx, $pw, 0, $pw, $ph);
+            }
+        }
+
+        $mpdf->Output($dir.'librillo-'.$filename, \Mpdf\Output\Destination::FILE);
+    }
+
+
+    private function GetBookletPages($np, $backcover = true) {
+        $lastpage = $np;
+        $np = 4 * ceil($np / 4);
+        $pp = [];
+
+        for ($i = 1; $i <= $np / 2; $i++) {
+
+            $p1 = $np - $i + 1;
+
+            if ($backcover) {
+                if ($i == 1) {
+                    $p1 = $lastpage;
+                } elseif ($p1 >= $lastpage) {
+                    $p1 = 0;
+                }
+            }
+
+            $pp[] = ($i % 2 == 1) ?
+                [ $i, $p1 ] : [ $p1,  $i ];
+        }
+
+        return $pp;
+    }
+
+    function mergePDFFiles(Array $filenames) {
+        $mpdf = new \Mpdf\Mpdf([
+            'format' => 'A4-L',
+            'margin_left' => 0,
+            'margin_right' => 0,
+            'margin_top' => 0,
+            'margin_bottom' => 0,
+            'margin_header' => 0,
+            'margin_footer' => 0,
+        ]);
+
+        if ($filenames) {
+
+            $filesTotal = sizeof($filenames);
+            $fileNumber = 1;
+
+            foreach ($filenames as $fileName) {
+                if (file_exists($fileName)) {
+                    $pagesInFile = $mpdf->SetSourceFile($fileName);
+                    for ($i = 1; $i <= $pagesInFile; $i++) {
+                        $tplId = $mpdf->ImportPage($i); // in mPdf v8 should be 'importPage($i)'
+                        $mpdf->UseTemplate($tplId);
+                        if (($fileNumber < $filesTotal) || ($i != $pagesInFile)) {
+                            $mpdf->WriteHTML('<pagebreak />');
+                        }
+                    }
+                }
+                $fileNumber++;
+            }
+
+            $mpdf->Output();
+        }
     }
 }