First pull request

pom.xml

@@ -16,7 +16,7 @@
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter</artifactId>
-            <version>5.11.4</version>
+            <version>6.0.1</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -28,9 +28,14 @@
         <dependency>
             <groupId>org.mockito</groupId>
             <artifactId>mockito-junit-jupiter</artifactId>
-            <version>5.15.2</version>
+            <version>5.21.0</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.awaitility</groupId>
+            <artifactId>awaitility</artifactId>
+            <version>4.3.0</version>
+        </dependency>
     </dependencies>
     <build>
         <plugins>
@@ -57,6 +62,19 @@
                     </execution>
                 </executions>
             </plugin>
+            <plugin>
+                <groupId>org.pitest</groupId>
+                <artifactId>pitest-maven</artifactId>
+                <version>1.22.0</version>
+                <dependencies>
+                    <dependency>
+                        <groupId>org.pitest</groupId>
+                        <artifactId>pitest-junit5-plugin</artifactId>
+                        <version>1.2.2</version>
+                    </dependency>
+                </dependencies>
+            </plugin>
+
             <plugin>
                 <groupId>org.jacoco</groupId>
                 <artifactId>jacoco-maven-plugin</artifactId>

src/main/java/com/example/payment/DatabaseConnection.java

@@ -0,0 +1,5 @@
+package com.example.payment;
+
+public interface DatabaseConnection {
+    void executeUpdate(String query);
+}

src/main/java/com/example/payment/EmailService.java

@@ -0,0 +1,5 @@
+package com.example.payment;
+
+public interface EmailService {
+    void sendPaymentConfirmation(String email, double amount);
+}

src/main/java/com/example/payment/PaymentApi.java

@@ -0,0 +1,5 @@
+package com.example.payment;
+
+public interface PaymentApi {
+    PaymentApiResponse charge(String apiKey, double amount);
+}

src/main/java/com/example/payment/PaymentApiResponse.java

@@ -0,0 +1,4 @@
+package com.example.payment;
+
+public record PaymentApiResponse(boolean success) {
+}

src/main/java/com/example/payment/PaymentProcessor.java

@@ -1,23 +1,32 @@
 package com.example.payment;
 
-//public class PaymentProcessor {
-//    private static final String API_KEY = "sk_test_123456";
-//
-//    public boolean processPayment(double amount) {
-//        // Anropar extern betaltjänst direkt med statisk API-nyckel
-//        PaymentApiResponse response = PaymentApi.charge(API_KEY, amount);
-//
-//        // Skriver till databas direkt
-//        if (response.isSuccess()) {
-//            DatabaseConnection.getInstance()
-//                    .executeUpdate("INSERT INTO payments (amount, status) VALUES (" + amount + ", 'SUCCESS')");
-//        }
-//
-//        // Skickar e-post direkt
-//        if (response.isSuccess()) {
-//            EmailService.sendPaymentConfirmation("user@example.com", amount);
-//        }
-//
-//        return response.isSuccess();
-//    }
-//}
+public class PaymentProcessor {
+    private static final String API_KEY = "sk_test_123456";
+    private final DatabaseConnection databaseConnection;
+    private final EmailService emailService;
+    private final PaymentApi paymentApi;
+
+    public PaymentProcessor(DatabaseConnection databaseConnection, EmailService emailService, PaymentApi paymentApi) {
+        this.databaseConnection = databaseConnection;
+        this.emailService = emailService;
+        this.paymentApi = paymentApi;
+    }
+
+    public boolean processPayment(double amount) {
+        // Anropar extern betaltjänst direkt med statisk API-nyckel
+        PaymentApiResponse response = this.paymentApi.charge(API_KEY, amount);
+
+        // Skriver till databas direkt
+        if (response.success()) {
+            this.databaseConnection
+                    .executeUpdate("INSERT INTO payments (amount, status) VALUES (" + amount + ", 'SUCCESS')");
+        }
+
+        // Skickar e-post direkt
+        if (response.success()) {
+            emailService.sendPaymentConfirmation("user@example.com", amount);
+        }
+
+        return response.success();
+    }
+}

src/main/java/com/example/shop/Discount.java

@@ -0,0 +1,18 @@
+package com.example.shop;
+
+public class Discount {
+    private int percentage;
+
+    public Discount(int percentage) {
+        this.percentage = percentage;
+    }
+
+    public double applyDiscount(double totalPrice){
+        double result = totalPrice - (totalPrice * ((double) this.percentage /100));
+        return Math.max(0, result);
+    }
+
+    public int getPercentage() {
+        return percentage;
+    }
+}

src/main/java/com/example/shop/DiscountProvider.java

@@ -0,0 +1,5 @@
+package com.example.shop;
+
+public interface DiscountProvider {
+    double applyDiscount(double totalPrice);
+}

src/main/java/com/example/shop/Item.java

@@ -0,0 +1,27 @@
+package com.example.shop;
+
+public class Item {
+
+    private String id;
+    private double price;
+    private int quantity;
+
+    public Item(String id, double price, int quantity) {
+        this.id = id;
+        this.price = price;
+        this.quantity = quantity;
+    }
+    public double getPrice() {
+        return price;
+    }
+    public int getQuantity() {
+        return quantity;
+    }
+    public void setQuantity(int quantity) {
+        this.quantity = quantity;
+    }
+    public String getId() {
+        return id;
+    }
+
+}

src/main/java/com/example/shop/ShoppingCart.java

@@ -0,0 +1,53 @@
+package com.example.shop;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ShoppingCart {
+
+    private List<Item> items =  new ArrayList<>();
+    private Discount discount;
+
+    public void addItem(Item newItem){
+
+        if ( newItem.getQuantity() > 0) {
+            for (Item existingItem : items) {
+                if (existingItem.getId().equals(newItem.getId())) {
+                    int updatedQuantity = existingItem.getQuantity() + newItem.getQuantity();
+                    existingItem.setQuantity(updatedQuantity);
+
+                    return;
+                }
+            }
+            this.items.add(newItem);
+        }
+    }
+
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public void removeItem(Item item){
+        this.items.remove(item);
+    }
+
+    public void setDiscount(Discount discount) {
+        this.discount = discount;
+    }
+
+    public double getTotalPrice(){
+        double totalPrice = items.stream()
+                .mapToDouble(item -> item.getPrice() * item.getQuantity())
+                .sum();
+
+        if (discount != null && discount.getPercentage() <= 100 && discount.getPercentage() > 0) {
+            return discount.applyDiscount(totalPrice);
+        }
+
+        return totalPrice;
+
+    }
+
+
+
+}