Features/loan

src/main/java/org/example/App.java

@@ -7,6 +7,8 @@
 import org.example.user.repository.JpaUserRepository;
 import org.example.user.repository.UserRepository;
 
+import java.time.format.DateTimeFormatter;
+import java.util.List;
 import java.util.Scanner;
 
 public class App {
@@ -18,6 +20,8 @@ static void main(String[] args) {
         Scanner scanner = new Scanner(System.in);
         final UserCLI userCli = new UserCLI(userService, scanner);
         SearchCli searchCli = new SearchCli(scanner, EMFactory.getEntityManager());
+        DateTimeFormatter formatter =
+            DateTimeFormatter.ofPattern("yyyy-MM-dd");
 
         // #######################
         // Application starts here
@@ -29,24 +33,63 @@ static void main(String[] args) {
             System.out.println("========================================================");
 
             if (SessionManager.isLoggedIn()) {
-                System.out.println("1. Sök bok  |  2. Hantera användare  |  3. Logga ut |  0. Avsluta");
+                System.out.println("1. Sök bok  |  2. Hantera användare  |  3. Logga ut  |  4. Mina lån  |  0. Avsluta");
             } else {
                 System.out.println("1. Sök bok  |  2. Logga in/Skapa konto  |  0. Avsluta");
             }
 
             System.out.print("Menyval: ");
             String choice = scanner.nextLine();
+            LoanServices loanServices = new LoanServices(EMFactory.getEntityManager());
             switch (choice) {
                 case "1" -> {
                     searchCli.bookSearchCli();
                 }
                 case "2" -> {
-                    if (SessionManager.isLoggedIn()) userCli.manageUserMenu();
-                    else userCli.userMenu();
+                    if (SessionManager.isLoggedIn()) {
+                        userCli.manageUserMenu();
+                    } else {
+                        userCli.userMenu();
+                    }
                 }
                 case "3" -> {
                     if (SessionManager.isLoggedIn()) userCli.logout();
                 }
+                case "4" -> {
+                    System.out.println("Dina aktiva lån:");
+                    List<Loan> loans = loanServices.activeLoans(SessionManager.getCurrentUser());
+
+                    boolean running = true;
+                    while (running) {
+                        if (!loans.isEmpty()) {
+                            int counter = 0;
+                            for (Loan loan : loans) {
+                                counter += 1;
+                                System.out.println(counter + ". Titel: " + loan.getBook().getTitle() + " - Åter: " + loan.getReturnDate()
+                                    .format(formatter));
+                            }
+                            System.out.println("Välj nummer för den bok du vill lämna tillbaka (0 = tillbaka): ");
+                            String inputString = scanner.nextLine();
+                            Integer input = Integer.parseInt(inputString);
+                            if (input >= 1 && input <= loans.size()) {
+                                loanServices.returnBook(
+                                    SessionManager.getCurrentUser(),
+                                    loans.get(input - 1).getBook()
+                                );
+                                loans.remove(input - 1);
+                                System.out.println("Du har lämnat tillbaka din bok!");
+                            } else if (input == 0) {
+                                running = false;
+                            } else {
+                                System.out.println("ogiltigt val.");
+                            }
+
+                        } else {
+                            System.out.println("Inga aktiva lån.");
+                            running = false;
+                        }
+                    }
+                }
                 case "0" -> appRunning = false;
                 default -> System.out.println("Ogiltigt val.");
             }

src/main/java/org/example/Book.java

@@ -81,7 +81,7 @@ public void setLoan(Loan loan) {
     @ManyToMany(mappedBy = "books")
     private Set<Genre> genres = new HashSet<>();
 
-    @OneToOne @JoinColumn(name = "loaned_book")
+    @OneToOne (mappedBy = "book")
     private Loan loan;
 
     public Set<Author> getAuthors() {

src/main/java/org/example/Loan.java

@@ -55,6 +55,7 @@ public Long getLoanId() {
     @ManyToOne @JoinColumn (name = "loan_user")
     private User user;
 
-    @OneToOne(mappedBy = "loan")
+    @OneToOne
+    @JoinColumn(name = "bookID")
     private Book book;
 }

src/main/java/org/example/LoanServices.java

@@ -6,7 +6,7 @@
 
 public class LoanServices {
 
-    final private EntityManager em;
+    private final EntityManager em;
 
     public LoanServices(EntityManager em) {
         this.em = em;
@@ -16,7 +16,7 @@ public LoanServices(EntityManager em) {
     public boolean isBookLoaned(Long bookId) {
 
         List<Loan> loans = em.createQuery(
-            "SELECT l FROM Loan l WHERE l.book.bookId = :bookId AND l.returnDate IS NULL",
+            "SELECT l FROM Loan l WHERE l.book.bookId = :bookId AND l.returnDate IS NOT NULL",
             Loan.class
         )
         .setParameter("bookId", bookId)
@@ -30,30 +30,35 @@ public boolean isBookLoaned(Long bookId) {
     }
 
     // Låna en bok
-    public boolean loanBook(Long bookId, Long userId) {
+    public boolean loanBook(User user, Book book) {
 
-        if (isBookLoaned(bookId)) {
+        if (isBookLoaned(book.getId())) {
             return false;
         }
 
-        User user = em.find(User.class, userId);
-        Book book = em.find(Book.class, bookId);
+        em.getTransaction().begin();
+
+        Book managedBook = em.merge(book);
 
         Loan loan = new Loan();
 
         loan.setUser(user);
-        loan.setBook(book);
         loan.setLoanDate(ZonedDateTime.now());
-        loan.setReturnDate(null);
+        loan.setReturnDate(ZonedDateTime.now().plusDays((7)));
+
+        loan.setBook(managedBook);
+        managedBook.setLoan(loan);
         em.persist(loan);
+        em.getTransaction().commit();
+
         return true;
     }
 
-    // Lämna tillbak en bok
+    // Lämna tillbaka en bok
     public boolean returnBook(User user, Book book) {
 
         Loan loan = em.createQuery(
-            "SELECT l FROM Loan l WHERE l.user = :user AND l.book = :book AND l.returnDate IS NULL",
+            "SELECT l FROM Loan l WHERE l.user = :user AND l.book = :book AND l.returnDate IS NOT NULL",
             Loan.class
         )
             .setParameter("user", user)
@@ -68,9 +73,20 @@ public boolean returnBook(User user, Book book) {
 
         em.getTransaction().begin();
 
-        loan.setReturnDate(ZonedDateTime.now());
-        book.setLoan(null);
+        Book managedBook = loan.getBook();
+        managedBook.setLoan(null);
+        em.remove(loan);
         em.getTransaction().commit();
         return true;
     }
+
+    public List<Loan> activeLoans(User user) {
+
+        return em.createQuery(
+            "SELECT l FROM Loan l WHERE l.user = :user",
+            Loan.class
+        )
+            .setParameter("user", user)
+            .getResultList();
+    }
 }

src/main/java/org/example/SearchCli.java

@@ -3,6 +3,7 @@
 import jakarta.persistence.EntityManager;
 import jakarta.persistence.EntityManagerFactory;
 import jakarta.persistence.Persistence;
+import org.example.user.SessionManager;
 
 import java.util.List;
 import java.util.Scanner;
@@ -104,13 +105,14 @@ private static void chooseAndShowBookDetails(Scanner sc, List<Book> results) {
             Book selected = results.get(n - 1);
             printBookDetails(selected);
 
-            System.out.print("Tryck Enter för att gå tillbaka til sök");
+            System.out.print("Tryck Enter för att gå tillbaka till sök");
             sc.nextLine();
             return;
         }
     }
 
     private static void printBookDetails(Book b) {
+        LoanServices loanServices = new LoanServices(em);
         System.out.println("\n==============================");
         System.out.println(" " + b.getTitle());
         System.out.println("------------------------------");
@@ -121,6 +123,44 @@ private static void printBookDetails(Book b) {
         String desc = b.getDescription();
         if (desc == null || desc.isBlank()) desc = "(Ingen beskrivning)";
         System.out.println("\nBeskrivning:\n" + desc);
+
+        if (loanServices.isBookLoaned(b.getId())){
+            System.out.println("Status: Utlånad");
+        } else {
+            System.out.println("Status: Tillgänglig");
+
+            boolean isLoggedIn = SessionManager.isLoggedIn();
+            boolean isRunning = true;
+
+            if (isLoggedIn){
+                while (isRunning) {
+                    System.out.println("1. Låna bok | 2. Tillbaka");
+                    String choice = sc.nextLine();
+
+                    switch (choice) {
+                        case "1" -> {
+                            loanServices.loanBook(SessionManager.getCurrentUser(), b);
+                            isRunning = false;
+                            System.out.println("Du har nu lånat boken!");
+                        }
+
+                        case "2" -> {
+                            isRunning = false;
+                        }
+                        default -> System.out.println("Ogiltigt val, försök igen.");
+                    }
+                }
+            }
+        }
+
+//        boolean isLoggedIn = SessionManager.isLoggedIn();
+//        User user = SessionManager.getCurrentUser();
+//        user.getUserId();
+
+        //todo:
+        // om tillgänglig och inloggad - låna bok
+            // om ej inloggad - skicka till logga in sidan.
+
         System.out.println("==============================");
     }