All good I suppose

src/app/controllers/CartController.php

@@ -0,0 +1,43 @@
+<?php
+
+require_once __DIR__ .'/../models/Cart.php';
+
+class CartController{
+
+    private $cartModel;
+
+    public function __construct(){
+        $this->cartModel = new Cart();
+    }
+
+    public function cartAction(){
+        if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
+            header('Location: /cart');
+            exit;
+        }
+        else {
+            $product = $_POST['product'];
+            if ($_POST['action'] === 'add') {
+                $this->addToCart($product->id, $product->name, $product->price);
+            } else if ($_POST['action'] === 'remove') {
+                $this->removeFromCart($product->id);
+            }
+        }
+    }
+
+    public function viewCart(){
+        $cart = $this->cartModel->getCart();
+        $total = $this->cartModel->computeTotal();
+        require_once __DIR__ . "/../views/cart.php";
+    }
+
+    public function addToCart($product_id, $quantity, $price) {
+        $this->cartModel->addProduct($product_id, $quantity, $price);
+    }
+
+    public function removeFromCart($product_id) {
+        $this->cartModel->removeProduct($product_id);
+    }
+
+}
+

src/app/models/Cart.php

@@ -0,0 +1,45 @@
+<?php
+
+class Cart
+{
+    public function __construct() {
+        if (!isset($_SESSION['cart'])) {
+            $_SESSION['cart'] = [];
+        }
+    }
+
+    public function addProduct($product_id, $name, $price) {
+        if (isset($_SESSION['cart'][$product_id])) {
+            $_SESSION['cart'][$product_id]['quantity']++;
+        } else {
+            $_SESSION['cart'][$product_id] = [
+                'name' => $name,
+                'quantity' => 1,
+                'price' => $price
+            ];
+        }
+    }
+
+    public function removeProduct($product_id) {
+        if (isset($_SESSION['cart'][$product_id])) {
+            if($_SESSION['cart'][$product_id]['quantity'] - 1 === 0) {
+                unset($_SESSION['cart'][$product_id]);
+            } else {
+                $_SESSION['cart'][$product_id]['quantity'] --;
+            }
+        }
+    }
+
+    public function getCart() {
+        return $_SESSION['cart'];
+    }
+
+    public function computeTotal() {
+        $total = 0;
+        foreach ($_SESSION['cart'] as $product) {
+            $total += $product['quantity'] * $product['price'];
+        }
+        return $total;
+    }
+
+}

src/app/views/cart.php

@@ -1,14 +1,13 @@
-<?php require_once '../controllers/cart.php' ?>
 <?php include 'partials/header.php'; ?>
-<div>
-    <h1>Current order</h1>
-    <?php
-    foreach ($_SESSION['cart'] as $product_id => $quantity) {
-        //TODO: display product name instead of id
-        echo "<div>
-            <p>" . $product_id . "</p>
-            <p>" . $quantity . "</p>
-          </div>";
-    }
-    ?>
-</div>
+
+<h1>Your Cart</h1>
+<ul>
+    <?php foreach ($cart as $item): ?>
+        <li>
+            <?php echo $item['name']; ?>
+            x <?php echo $item['quantity']; ?>,
+            <?php echo $item['price']; ?> €
+        </li>
+    <?php endforeach; ?>
+</ul>
+<p>Total: <?php echo $total; ?> €</p>

src/app/views/partials/navbar.php

@@ -13,7 +13,7 @@
             <?php if ($userId) { ?>
                 <li><a href="#">Order</a></li>
                 <li><a href="/account">My account</a></li>
-                <li><a href="/basket">Cart</a></li>
+                <li><a href="/cart">Cart</a></li>
                 <li><a href="/sign-out">Sign out</a></li>
             <?php } else { ?>
                 <li><a href="/sign-in">Sign in</a></li>

src/app/views/product.php

@@ -17,6 +17,14 @@
             . " - " . $product->supplier_phone 
             . "</p>";
         }
+        echo "
+            <form method='POST' action='/cart'>
+            <input type='hidden' name='product' value='" . $product . "'>
+            <button type='submit' name='action' value='add'>Add to Cart</button>
+            <button type='submit' name='action' value='remove'>Remove from Cart</button>
+            <!-- Handle appearance of the button above with Js: make
+            it greyed out or hidden when the add button is clicked ? -->
+            </form>"
     ?>
 </div>
 <?php include 'partials/footer.php'; ?>

src/routes/web.php

@@ -9,9 +9,11 @@
         '/account-data'     => ['AuthController', 'getAccountData'],
         '/products'         => ['ProductController', 'viewProducts'],
         '/product'          => ['ProductController', 'viewSingleProduct'],
+        '/cart'             => ['CartController', 'viewCart'],
     ],
     'POST' => [
         '/sign-in'          => ['AuthController', 'signIn'],
         '/sign-up'          => ['AuthController', 'signUp'],
+        '/cart'             => ['CartController', 'cartAction'],
     ],
 ];