update code

app/Exports/BooksExport.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace App\Exports;
+
+use Maatwebsite\Excel\Concerns\WithMultipleSheets;
+use App\Entities\Book;
+use App\Exports\{
+    ComeInDocumentsExport,
+    ComeOutDocumentsExport,
+    PrivateDocumentsExport,
+};
+
+class BooksExport implements WithMultipleSheets
+{
+    protected $books;
+    protected $from;
+    protected $to;
+
+    public function __construct($books, $from = null, $to = null){
+        $this->books = $books;
+        $this->from = $from;
+        $this->to = $to;
+    }
+
+    public function sheets(): array
+    {
+        $sheets = [];
+
+        foreach ($this->books as $book) {
+            $sheets[] = $this->getSheet($book);
+        }
+
+        return $sheets;
+    }
+
+    protected function getSheet(Book $book)
+    {
+        if($book->isComeIn()){
+            return new ComeInDocumentsExport($book->documents, $book->name, $this->from, $this->to);
+        }
+
+        if($book->isComeOut()){
+            return new ComeOutDocumentsExport($book->documents, $book->name, $this->from, $this->to);
+        }
+
+        if($book->isPrivate()){
+            return new PrivateDocumentsExport($book->documents, $book->name, $this->from, $this->to);
+        }
+    }
+
+}