Add UI

src/main/java/org/example/TUI.java

@@ -0,0 +1,56 @@
+package org.example;
+
+import java.util.Collection;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.List;
+
+public class TUI {
+
+    Shop shop;
+    boolean exit = false;
+
+    public TUI(Shop shop) {
+        this.shop = shop;
+    }
+
+    public void processInput(String input) {
+        String[] tokens = input.split("\\s+");
+        String command = tokens[0];
+        switch (command) {
+            case "exit" -> exit();
+            case "checkout" -> checkout();
+            case "list" -> listProducts(shop.products);
+            case "cart" -> listCart(shop.getCart());
+            case "add" -> shop.addProductToCart(shop.getProductById(Integer.parseInt(tokens[1])));
+            case "remove" -> shop.removeProductFromCart(shop.getProductById(Integer.parseInt(tokens[1])));
+            case "set" ->
+                    shop.setProductQuantityInCart(shop.getProductById(Integer.parseInt(tokens[1])), Integer.parseInt(tokens[2]));
+            default -> System.out.println("Unbekannter Befehl: " + input);
+        }
+    }
+
+    public void exit() {
+        exit = true;
+    }
+
+    public void listProducts(HashMap<Product, Integer> productStock) {
+        productStock.keySet().stream().sorted(Comparator.comparingInt(p -> p.id)).forEach(product -> {
+            System.out.println("(" + product.id + ") " + product.name + ", Preis: " + product.price + ", Gewicht: " + product.weight + ", Auf Lager: " + productStock.get(product));
+        });
+    }
+
+    public void listCart(HashMap<Product, Integer> cardContents) {
+        cardContents.forEach((product, count) -> {
+            System.out.println("(" + product.id + ") " + product.name + ", Preis: " + product.price + ", Gewicht: " + product.weight + ", Anzahl: " + count);
+        });
+    }
+
+    public void checkout() {
+        Order order = shop.checkout();
+        System.out.println("MwSt.: " + order.calculateTotalVat() + "€");
+        System.out.println("Versand: " + order.calculateShippingCost() + "€");
+        System.out.println("Brutto: " + order.calculateTotalPriceWithVat() + "€");
+    }
+
+}