added import and export recurring invoices

app/Imports/Sales/Invoices/Sheets/InvoiceItems.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace App\Imports\Sales\Invoices\Sheets;
+
+use App\Abstracts\Import;
+use App\Http\Requests\Document\DocumentItem as Request;
+use App\Models\Document\Document;
+use App\Models\Document\DocumentItem as Model;
+
+class InvoiceItems extends Import
+{
+    public $request_class = Request::class;
+
+    public function model(array $row)
+    {
+        return new Model($row);
+    }
+
+    public function map($row): array
+    {
+        if ($this->isEmpty($row, 'invoice_number')) {
+            return [];
+        }
+
+        $row['invoice_number'] = (string) $row['invoice_number'];
+
+        $row = parent::map($row);
+
+        $row['document_id'] = (int) Document::invoice()->number($row['invoice_number'])->pluck('id')->first();
+
+        if (empty($row['item_id']) && ! empty($row['item_name'])) {
+            $row['item_id'] = $this->getItemIdFromName($row);
+
+            $row['name'] = $row['item_name'];
+        }
+
+        $row['description'] = !empty($row['item_description']) ? $row['item_description'] : '';
+
+        $row['tax'] = (double) $row['tax'];
+        $row['tax_id'] = 0;
+        $row['type'] = Document::INVOICE_TYPE;
+
+        return $row;
+    }
+
+    public function prepareRules(array $rules): array
+    {
+        $rules['invoice_number'] = 'required|string';
+
+        unset($rules['invoice_id']);
+
+        return $rules;
+    }
+}