feat(billing): renewals, coupons, VAT numbering, billing cycles and invoice payment tracking

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

app/Services/InvoicePdfService.php

@@ -4,7 +4,9 @@ namespace App\Services;
 
 use App\Models\Invoice;
 use App\Models\Setting;
+use App\Support\InvoiceBuyer;
 use Barryvdh\DomPDF\Facade\Pdf;
+use Illuminate\Support\Facades\Log;
 
 class InvoicePdfService
 {
@@ -19,6 +21,7 @@ class InvoicePdfService
             'invoice'        => $invoice,
             'invoiceItems'   => $invoice->invoiceItems,
             'customer'       => $invoice->customer,
+            'buyer'          => InvoiceBuyer::forInvoice($invoice),
             'order'          => $invoice->order,
             'companyName'    => $settingValue->company    ?? 'Thế Giới Số',
             'companyAddress' => $settingValue->address    ?? '',
@@ -46,6 +49,32 @@ class InvoicePdfService
             ->output();
     }
 
+    public function vatFileName(Invoice $invoice): string
+    {
+        return 'Hoa-don-VAT-' . $invoice->vat_serial . '-' . $invoice->vat_number . '.pdf';
+    }
+
+    /** @return array{pdf: string, file_name: string}|null */
+    public function attachment(?int $invoiceId): ?array
+    {
+        if (!$invoiceId) {
+            return null;
+        }
+
+        try {
+            $invoice = Invoice::find($invoiceId);
+
+            return $invoice ? ['pdf' => $this->generate($invoice), 'file_name' => $this->generateFileName($invoice)] : null;
+        } catch (\Throwable $e) {
+            Log::warning('InvoicePdfService: PDF generation failed, sending without attachment', [
+                'invoice_id' => $invoiceId,
+                'error' => $e->getMessage(),
+            ]);
+
+            return null;
+        }
+    }
+
     public function generateFileName(Invoice $invoice): string
     {
         return 'Hoa-don-' . $invoice->invoice_number . '.pdf';