feat(cart): add cart and wishlist controllers

src/Controllers/CartController.php

@@ -0,0 +1,90 @@
+<?php
+
+namespace Bazaar\Controllers;
+
+use Bazaar\Core\Response;
+
+final class CartController extends Controller
+{
+    public function index(): Response
+    {
+        return $this->view('cart.index', $this->cartViewData());
+    }
+
+    public function add(): Response
+    {
+        $productId = $this->ctx->request->integer('productId');
+        $quantity = max(1, $this->ctx->request->integer('quantity', 1));
+        $variantId = $this->ctx->request->integer('variantId', 0) ?: null;
+        $this->ctx->cart->add($productId, $quantity, $variantId);
+        $this->ctx->session->flash('success', 'Item added to your cart.');
+        return $this->redirect('/cart');
+    }
+
+    public function update(): Response
+    {
+        $productId = $this->ctx->request->integer('productId');
+        $quantity = $this->ctx->request->integer('quantity', 1);
+        $variantId = $this->ctx->request->integer('variantId', 0) ?: null;
+        $this->ctx->cart->update($productId, $quantity, $variantId);
+        return $this->redirect('/cart');
+    }
+
+    public function remove(): Response
+    {
+        $productId = $this->ctx->request->integer('productId');
+        $variantId = $this->ctx->request->integer('variantId', 0) ?: null;
+        $this->ctx->cart->remove($productId, $variantId);
+        $this->ctx->session->flash('success', 'Item removed from your cart.');
+        return $this->redirect('/cart');
+    }
+
+    public function applyCoupon(): Response
+    {
+        $code = trim((string) $this->ctx->request->input('code', ''));
+        $result = $this->ctx->couponService->evaluate($code, $this->ctx->cart->totalCents());
+
+        if ($result->isValid()) {
+            $this->ctx->session->put('couponCode', $result->coupon['code']);
+            $this->ctx->session->flash('success', $this->ctx->translator->get('cart.couponApplied', [
+                'code' => $result->coupon['code'],
+            ]));
+        } else {
+            $this->ctx->session->forget('couponCode');
+            $this->ctx->session->flash('error', $result->message());
+        }
+        return $this->redirect('/cart');
+    }
+
+    public function removeCoupon(): Response
+    {
+        $this->ctx->session->forget('couponCode');
+        $this->ctx->session->flash('success', 'Coupon removed.');
+        return $this->redirect('/cart');
+    }
+
+    private function cartViewData(): array
+    {
+        $subtotalCents = $this->ctx->cart->totalCents();
+        $discountCents = 0;
+        $couponCode = (string) $this->ctx->session->get('couponCode', '');
+
+        if ($couponCode !== '') {
+            $result = $this->ctx->couponService->evaluate($couponCode, $subtotalCents);
+            if ($result->isValid()) {
+                $discountCents = $result->discountCents;
+            } else {
+                $this->ctx->session->forget('couponCode');
+                $couponCode = '';
+            }
+        }
+
+        return [
+            'lines' => $this->ctx->cart->lines(),
+            'subtotalCents' => $subtotalCents,
+            'discountCents' => $discountCents,
+            'totalCents' => $subtotalCents - $discountCents,
+            'couponCode' => $couponCode,
+        ];
+    }
+}