Add SKU/GTIN fields, live barcode preview, and Shopify price import

- Add SKU and GTIN fields to product variant repeater
- Render EAN/UPC barcode live from GTIN input (picqer/php-barcode-generator)
- Pull variant price from Shopify API instead of defaulting to 0
- Sync sku/gtin through EditProduct and CreateProduct save logic

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Filament/User/Resources/ProductResource.php

@@ -8,13 +8,17 @@ use App\Models\Product;
 use Filament\Forms;
 use Filament\Forms\Form;
 use Filament\Forms\Components\FileUpload;
+use Filament\Forms\Components\Placeholder;
 use Filament\Forms\Components\Repeater;
 use Filament\Forms\Components\Select;
 use Filament\Forms\Components\TextInput;
+use Filament\Forms\Get;
 use Filament\Resources\Resource;
 use Filament\Tables;
 use Filament\Tables\Table;
+use Illuminate\Support\HtmlString;
 use App\Models\Packing;
+use Picqer\Barcode\BarcodeGeneratorSVG;
 
 class ProductResource extends Resource {
     protected static ?string $model = Product::class;
@@ -51,10 +55,6 @@ class ProductResource extends Resource {
                     ->required(),
                 Repeater::make('sizes')
                     ->schema([
-                        TextInput::make('gtin')
-                            ->label('GTIN'),
-                        TextInput::make('description')
-                            ->label('Bezeichnung'),
                         Select::make('packing_id')
                             ->label('Verpackung')
                             ->options(function () {
@@ -68,25 +68,48 @@ class ProductResource extends Resource {
                             ->label('Preis (in EUR)')
                             ->numeric()
                             ->required(),
+                        TextInput::make('sku')
+                            ->label('SKU'),
+                        TextInput::make('gtin')
+                            ->label('GTIN')
+                            ->live(debounce: 500),
+                        Placeholder::make('barcode_preview')
+                            ->label('Barcode')
+                            ->content(function (Get $get): HtmlString {
+                                $gtin = trim((string) $get('gtin'));
+                                if (empty($gtin)) {
+                                    return new HtmlString('');
+                                }
+                                $type = match (strlen($gtin)) {
+                                    8  => BarcodeGeneratorSVG::TYPE_EAN_8,
+                                    13 => BarcodeGeneratorSVG::TYPE_EAN_13,
+                                    12 => BarcodeGeneratorSVG::TYPE_UPC_A,
+                                    14 => BarcodeGeneratorSVG::TYPE_CODABAR,
+                                    default => BarcodeGeneratorSVG::TYPE_CODE_128,
+                                };
+                                $svg = (new BarcodeGeneratorSVG())->getBarcode($gtin, $type, 2, 60);
+                                return new HtmlString($svg);
+                            })
+                            ->columnSpanFull()
+                            ->visible(fn (Get $get) => filled($get('gtin'))),
                     ])
                     ->label('Größen & Preise')
                     ->columns(2)
                     ->addActionLabel('Option hinzufügen')
                     ->afterStateHydrated(function ($state, $set, $record) {
                         if ($record) {
-                            // Load the spices relationship with pivot data
                             $record->load('sizes');
 
-                            // Map the spices and their pivot data to the format the repeater expects
                             $sizesData = $record->sizes->map(function ($size) {
                                 return [
-                                    'packing_id' => $size->id,
-                                    'price' => $size->pivot->price,
+                                    'packing_id'  => $size->id,
+                                    'price'       => $size->pivot->price,
                                     'description' => $size->pivot->description,
+                                    'sku'         => $size->pivot->sku,
+                                    'gtin'        => $size->pivot->gtin,
                                 ];
                             })->toArray();
 
-                            // Set the state for the repeater field to the mapped spices data
                             $set('sizes', $sizesData);
                         }
                         return $state;

app/Filament/User/Resources/ProductResource/Pages/CreateProduct.php

@@ -17,10 +17,12 @@ class CreateProduct extends CreateRecord
 
         foreach ($data['sizes'] as $size) {
             ProductSize::create([
-                'product_id' => $record->id,
-                'packing_id' => $size['packing_id'],
-                'description' => $size['description'],
-                'price' => $size['price'],
+                'product_id'  => $record->id,
+                'packing_id'  => $size['packing_id'],
+                'description' => $size['description'] ?? null,
+                'price'       => $size['price'],
+                'sku'         => $size['sku'] ?? null,
+                'gtin'        => $size['gtin'] ?? null,
             ]);
         }
         return $record;

app/Filament/User/Resources/ProductResource/Pages/EditProduct.php

@@ -27,7 +27,12 @@ class EditProduct extends EditRecord
         $sizes = collect($this->data['sizes'] ?? [])
             ->mapWithKeys(function ($size) {
                 return [
-                    $size['packing_id'] => ['description' => $size['description'], 'price' =>$size['price']],
+                    $size['packing_id'] => [
+                        'description' => $size['description'] ?? null,
+                        'price'       => $size['price'],
+                        'sku'         => $size['sku'] ?? null,
+                        'gtin'        => $size['gtin'] ?? null,
+                    ],
                 ];
             })
             ->toArray();