feat(cart): implement cart management with add, update, and remove item functionalities

2026-06-25 10:24:45 -03:00
parent a5b1539a80
commit 492c6c4ac2
12 changed files with 838 additions and 23 deletions
--- a/app/Domains/Cart/Services/CartService.php
+++ b/app/Domains/Cart/Services/CartService.php
@@ -0,0 +1,204 @@
+<?php
+
+namespace App\Domains\Cart\Services;
+
+use App\Domains\Cart\Models\Cart;
+use App\Domains\Tenant\Models\Tenant;
+use App\Models\User;
+use Illuminate\Http\Request;
+use Illuminate\Support\Str;
+use Symfony\Component\HttpFoundation\Cookie;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+
+class CartService
+{
+    public function show(Tenant $tenant, Request $request): Cart
+    {
+        $identity = $this->resolveIdentity($request);
+
+        if ($identity === null) {
+            return $this->makeEmptyCart($tenant);
+        }
+
+        $cart = $this->findCart($tenant, $identity);
+
+        if ($cart === null) {
+            return $this->makeEmptyCart($tenant);
+        }
+
+        return $this->loadCart($cart);
+    }
+
+    /**
+     * @return array{cart: Cart, guest_token: ?string}
+     */
+    public function addItem(Tenant $tenant, Request $request, int $productVariantId, int $quantity): array
+    {
+        $resolvedIdentity = $this->resolveIdentity($request, true);
+        $identity = $resolvedIdentity['identity'];
+        $cart = $this->findOrCreateCart($tenant, $identity);
+        $cart->addItem($productVariantId, $quantity);
+
+        return [
+            'cart' => $this->loadCart($cart),
+            'guest_token' => $resolvedIdentity['generated_guest_token'],
+        ];
+    }
+
+    public function updateItemQuantity(Tenant $tenant, Request $request, int $productVariantId, int $quantity): Cart
+    {
+        $identity = $this->requireIdentity($request);
+        $cart = $this->findCartOrFail($tenant, $identity);
+        $cart->updateItem($productVariantId, $quantity);
+
+        return $this->loadCart($cart);
+    }
+
+    public function removeItem(Tenant $tenant, Request $request, int $productVariantId): Cart
+    {
+        $identity = $this->requireIdentity($request);
+        $cart = $this->findCartOrFail($tenant, $identity);
+        $cart->removeItem($productVariantId);
+
+        return $this->loadCart($cart);
+    }
+
+    public function makeGuestTokenCookie(string $guestToken): Cookie
+    {
+        return cookie(
+            'guest_token',
+            $guestToken,
+            60 * 24 * 180,
+            '/',
+            null,
+            false,
+            true,
+            false,
+            'lax',
+        );
+    }
+
+    protected function makeEmptyCart(Tenant $tenant): Cart
+    {
+        $cart = new Cart([
+            'tenant_codigo' => $tenant->codigo,
+            'status' => 'active',
+        ]);
+
+        $cart->setRelation('items', collect());
+
+        return $cart;
+    }
+
+    protected function loadCart(Cart $cart): Cart
+    {
+        return $cart->fresh()->load([
+            'items.variant.product',
+            'items.variant.definitions.attribute',
+        ]);
+    }
+
+    /**
+     * @return array{identity: array{user_id: ?int, guest_token: ?string}, generated_guest_token: ?string}|null
+     */
+    protected function resolveIdentity(Request $request, bool $generateGuestToken = false): ?array
+    {
+        $user = $request->user();
+
+        if ($user instanceof User) {
+            return [
+                'identity' => [
+                    'user_id' => $user->getKey(),
+                    'guest_token' => null,
+                ],
+                'generated_guest_token' => null,
+            ];
+        }
+
+        $guestToken = $request->cookie('guest_token');
+
+        if (is_string($guestToken) && $guestToken !== '') {
+            return [
+                'identity' => [
+                    'user_id' => null,
+                    'guest_token' => $guestToken,
+                ],
+                'generated_guest_token' => null,
+            ];
+        }
+
+        if (! $generateGuestToken) {
+            return null;
+        }
+
+        $generatedGuestToken = (string) Str::uuid();
+
+        return [
+            'identity' => [
+                'user_id' => null,
+                'guest_token' => $generatedGuestToken,
+            ],
+            'generated_guest_token' => $generatedGuestToken,
+        ];
+    }
+
+    /**
+     * @return array{user_id: ?int, guest_token: ?string}
+     */
+    protected function requireIdentity(Request $request): array
+    {
+        $resolvedIdentity = $this->resolveIdentity($request);
+
+        if ($resolvedIdentity === null) {
+            throw new NotFoundHttpException('Cart not found.');
+        }
+
+        return $resolvedIdentity['identity'];
+    }
+
+    /**
+     * @param  array{user_id: ?int, guest_token: ?string}  $identity
+     */
+    protected function findCart(Tenant $tenant, array $identity): ?Cart
+    {
+        return Cart::query()
+            ->where('tenant_codigo', $tenant->codigo)
+            ->when(
+                $identity['user_id'] !== null,
+                fn ($query) => $query->where('user_id', $identity['user_id']),
+                fn ($query) => $query->where('guest_token', $identity['guest_token']),
+            )
+            ->first();
+    }
+
+    /**
+     * @param  array{user_id: ?int, guest_token: ?string}  $identity
+     */
+    protected function findCartOrFail(Tenant $tenant, array $identity): Cart
+    {
+        $cart = $this->findCart($tenant, $identity);
+
+        if ($cart === null) {
+            throw new NotFoundHttpException('Cart not found.');
+        }
+
+        return $cart;
+    }
+
+    /**
+     * @param  array{user_id: ?int, guest_token: ?string}  $identity
+     */
+    protected function findOrCreateCart(Tenant $tenant, array $identity): Cart
+    {
+        $attributes = ['tenant_codigo' => $tenant->codigo];
+
+        if ($identity['user_id'] !== null) {
+            $attributes['user_id'] = $identity['user_id'];
+        } else {
+            $attributes['guest_token'] = $identity['guest_token'];
+        }
+
+        return Cart::query()->firstOrCreate($attributes, ['status' => 'active']);
+    }
+
+}