Add "Shopping Cart" project

Author: thecodeholic

Shopping Cart/Cart.php

@@ -0,0 +1,58 @@
+<?php
+
+
+class Cart
+{
+    /**
+     * @var CartItem[]
+     */
+    private array $items = [];
+
+    // TODO Generate getters and setters of properties
+
+    /**
+     * Add Product $product into cart. If product already exists inside cart
+     * it must update quantity.
+     * This must create CartItem and return CartItem from method
+     * Bonus: $quantity must not become more than whatever
+     * is $availableQuantity of the Product
+     *
+     * @param Product $product
+     * @param int $quantity
+     * @return CartItem
+     */
+    public function addProduct(Product $product, int $quantity): CartItem
+    {
+        //TODO Implement method
+    }
+
+    /**
+     * Remove product from cart
+     *
+     * @param Product $product
+     */
+    public function removeProduct(Product $product)
+    {
+        //TODO Implement method
+    }
+
+    /**
+     * This returns total number of products added in cart
+     *
+     * @return int
+     */
+    public function getTotalQuantity(): int
+    {
+        //TODO Implement method
+    }
+
+    /**
+     * This returns total price of products added in cart
+     *
+     * @return float
+     */
+    public function getTotalSum(): float
+    {
+        //TODO Implement method
+    }
+}

Shopping Cart/CartItem.php

@@ -0,0 +1,23 @@
+<?php
+
+
+class CartItem
+{
+    private Product $product;
+    private int $quantity;
+
+    // TODO Generate constructor with all properties of the class
+    // TODO Generate getters and setters of properties
+
+    public function increaseQuantity()
+    {
+        //TODO $quantity must be increased by one.
+        // Bonus: $quantity must not become more than whatever is Product::$availableQuantity
+    }
+
+    public function decreaseQuantity()
+    {
+        //TODO $quantity must be increased by one.
+        // Bonus: Quantity must not become less than 1
+    }
+}

Shopping Cart/Product.php

@@ -0,0 +1,39 @@
+<?php
+
+
+class Product
+{
+    private int $id;
+    private string $title;
+    private float $price;
+    private int $availableQuantity;
+
+    // TODO Generate constructor with all properties of the class
+    // TODO Generate getters and setters of properties
+
+    /**
+     * Add Product $product into cart. If product already exists inside cart
+     * it must update quantity.
+     * This must create CartItem and return CartItem from method
+     * Bonus: $quantity must not become more than whatever
+     * is $availableQuantity of the Product
+     *
+     * @param Cart $cart
+     * @param int $quantity
+     * @return CartItem
+     */
+    public function addToCart(Cart $cart, int $quantity): CartItem
+    {
+        //TODO Implement method
+    }
+
+    /**
+     * Remove product from cart
+     *
+     * @param Cart $cart
+     */
+    public function removeFromCart(Cart $cart)
+    {
+        //TODO Implement method
+    }
+}

Shopping Cart/index.php

@@ -0,0 +1,33 @@
+<?php
+
+require_once "Product.php";
+require_once "Cart.php";
+require_once "CartItem.php";
+
+$product1 = new Product(1, "iPhone 11", 2500, 10);
+$product2 = new Product(2, "M2 SSD", 400, 10);
+$product3 = new Product(3, "Samsung Galaxy S20", 3200, 10);
+$cart = new Cart();
+$cartItem1 = $cart->addProduct($product1, 1);
+$cartItem2 = $product2->addToCart($cart, 1);
+echo "Number of items in cart: ".PHP_EOL;
+echo $cart->getTotalQuantity().PHP_EOL; // This must print 2
+echo "Total price of items in cart: ".PHP_EOL;
+echo $cart->getTotalSum().PHP_EOL; // This must print 2900
+
+$cartItem2->increaseQuantity();
+$cartItem2->increaseQuantity();
+
+echo "Number of items in cart: ".PHP_EOL;
+echo $cart->getTotalQuantity().PHP_EOL; // This must print 4
+
+echo "Total price of items in cart: ".PHP_EOL;
+echo $cart->getTotalSum().PHP_EOL; // This must print 3700
+
+$cart->removeProduct($product1);
+
+echo "Number of items in cart: ".PHP_EOL;
+echo $cart->getTotalQuantity().PHP_EOL; // This must print 4
+
+echo "Total price of items in cart: ".PHP_EOL;
+echo $cart->getTotalSum().PHP_EOL; // This must print 3700