Ejercicio adicional sin srp

Author: simonguzman

Roadmap/26 - SOLID SRP/java/simonguzman.java

@@ -1,11 +1,129 @@
 
 import java.io.FileWriter;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
 
 public class simonguzman {
     public static void main(String[] args) {
         //incorrectSrp();
-        correctSrp();
+        //correctSrp();
+        additionalExerciseNoSrp();
     }
+    /****************************** Ejercicio adicional(Sin srp) ******************************/
+    public static void additionalExerciseNoSrp(){
+        Library library = new Library();
+
+        library.registerBook("1984", "George Orwell", 3);
+        library.registerUser("John Doe", "001", "johndoe@example.com");
+
+        library.borrowBook("001", "1984");
+        library.returnBook("001", "1984");
+    }
+
+    static class Library{
+        private List<Book> books = new ArrayList<>();
+        private List<User> users = new ArrayList<>();
+        private Map<User, List<Book>> borrowedBooks = new HashMap<>();
+
+        public void registerBook(String title, String author, int copies){
+            books.add(new Book(title, author, copies));
+            System.out.println("Libro registrado: "+title);
+        }
+
+        public void registerUser(String name, String id, String email){
+            users.add(new User(name, id, email));
+            System.out.println("Usuario registrado: "+name);
+        }
+
+        public void borrowBook(String userId, String bookTitle){
+            User user = users.stream().filter(u -> u.getId().equals(userId)).findFirst().orElse(null);
+            Book book = books.stream().filter(b -> b.getTitle().equals(bookTitle)).findFirst().orElse(null);
+
+            if(user != null && book != null && book.getCopies() > 0){
+                borrowedBooks.computeIfAbsent(user, k -> new ArrayList<>()).add(book);
+                book.setCopies(book.getCopies()-1);
+                System.out.println("Libro prestado: " + bookTitle + " a " + user.getName());
+            }else{
+                System.out.println("No se pudo procesar el prestamo.");
+            }
+        }
+
+        public void returnBook(String userId, String bookTitle){
+            User user = users.stream().filter(u -> u.getId().equals(userId)).findFirst().orElse(null);
+            List<Book> borrowed = borrowedBooks.get(user); 
+
+            if(borrowed != null){
+                Book book = borrowed.stream().filter(b -> b.getTitle().equals(bookTitle)).findFirst().orElse(null);
+                if(book != null){
+                    borrowed.remove(book);
+                    book.setCopies(book.getCopies() + 1);
+                    System.out.println("Libro devuelto: "+bookTitle);
+                }
+            }else{
+                System.out.println("ERROR: No se pudo devolver el libro.");
+            }
+        }
+    }
+
+    static class Book{
+        private String title;
+        private String author;
+        private int copies;
+
+        public Book(){
+
+        }
+
+        public Book(String title, String author, int copies){
+            this.title = title;
+            this.author = author;
+            this.copies = copies;
+        }
+
+        public String getTitle() {
+            return title;
+        }
+
+        public int getCopies() {
+            return copies;
+        }
+
+        public void setCopies(int copies) {
+            this.copies = copies;
+        }
+
+    }
+
+    static class User{
+        private String name;
+        private String id;
+        private String email;
+
+        public User(){
+
+        }
+
+        public User(String name, String id, String email){
+            this.name = name;
+            this.id = id;
+            this.email = email;
+        }
+
+        public String getName() {
+            return name;
+        }
+
+        public String getId() {
+            return id;
+        }
+
+        public String getEmail() {
+            return email;
+        }
+    }
+
     /****************************** ejemplo con srp(Correcto) ******************************/
     public static void correctSrp() {
         InvoiceSrp invoice = new InvoiceSrp("Laptop",2,1200.00);