feat(admin): add variant controller

src/Controllers/Admin/VariantController.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace Bazaar\Controllers\Admin;
+
+use Bazaar\Controllers\Controller;
+use Bazaar\Core\Response;
+
+final class VariantController extends Controller
+{
+    public function index(string $id): Response
+    {
+        $product = $this->ctx->products->find((int) $id);
+        if ($product === null) {
+            return $this->notFound();
+        }
+
+        return $this->view('admin.variants.index', [
+            'product' => $product,
+            'variants' => $this->ctx->variants->forProduct((int) $id),
+            'attributes' => $this->ctx->attributes->withValues(),
+        ], 'admin.layout');
+    }
+
+    public function store(string $id): Response
+    {
+        $productId = (int) $id;
+        $product = $this->ctx->products->find($productId);
+        if ($product === null) {
+            return $this->notFound();
+        }
+
+        $request = $this->ctx->request;
+        $sku = trim((string) $request->input('sku', ''));
+        if ($sku === '') {
+            $sku = slugify($product['name']) . '-' . substr(bin2hex(random_bytes(3)), 0, 6);
+        }
+        $priceCents = (int) round((float) $request->input('price', 0) * 100);
+        $stock = $request->integer('stockQuantity');
+
+        $variantId = $this->ctx->variants->create($productId, $sku, $priceCents, max(0, $stock));
+
+        $options = $request->input('option', []);
+        if (is_array($options)) {
+            foreach ($options as $attributeId => $valueId) {
+                if (is_numeric($valueId) && (int) $valueId > 0) {
+                    $this->ctx->variants->setOption($variantId, (int) $attributeId, (int) $valueId);
+                }
+            }
+        }
+
+        $this->ctx->session->flash('success', 'Variant added.');
+        return $this->redirect('/admin/products/' . $productId . '/variants');
+    }
+
+    public function destroy(string $id): Response
+    {
+        $variant = $this->ctx->variants->find((int) $id);
+        if ($variant === null) {
+            return $this->notFound();
+        }
+        $this->ctx->variants->delete((int) $id);
+        $this->ctx->session->flash('success', 'Variant removed.');
+        return $this->redirect('/admin/products/' . (int) $variant['productId'] . '/variants');
+    }
+}