initial commit

app/Services/InvoiceService.php

@@ -0,0 +1,58 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services;
+
+use App\Models\Invoice;
+use App\Models\InvoiceItem;
+use Barryvdh\DomPDF\Facade\Pdf;
+use Illuminate\Http\Response;
+
+final class InvoiceService
+{
+    public function create(array $data, array $items): Invoice
+    {
+        $invoice = Invoice::create([
+            ...$data,
+            'invoice_number' => Invoice::generateNumber(),
+            'subtotal'       => 0,
+            'tax_amount'     => 0,
+            'total'          => 0,
+        ]);
+
+        foreach ($items as $item) {
+            $item['total'] = $item['quantity'] * $item['unit_price'];
+            $invoice->items()->create($item);
+        }
+
+        $invoice->recalculate();
+
+        return $invoice;
+    }
+
+    public function update(Invoice $invoice, array $data, array $items): Invoice
+    {
+        $invoice->update($data);
+        $invoice->items()->delete();
+
+        foreach ($items as $item) {
+            $item['total'] = $item['quantity'] * $item['unit_price'];
+            $invoice->items()->create($item);
+        }
+
+        $invoice->recalculate();
+
+        return $invoice->fresh();
+    }
+
+    public function generatePdf(Invoice $invoice): Response
+    {
+        $invoice->load('client', 'items');
+
+        $pdf = Pdf::loadView('invoices.pdf', compact('invoice'));
+        $pdf->setPaper('A4', 'portrait');
+
+        return $pdf->download("invoice-{$invoice->invoice_number}.pdf");
+    }
+}