Implement user management endpoints using hashmap storage for now (we will have to implement database later): create, retrieve, update, and delete users

helpapp/user-service/src/main/java/insa/application/helpapp/rest/UserServiceApplication.java

@@ -2,19 +2,97 @@ package insa.application.helpapp.rest;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.*;
+import java.util.concurrent.atomic.AtomicLong;
 
 @SpringBootApplication
 @RestController
+@RequestMapping("/users")
 public class UserServiceApplication {
 
+    private final Map<Long, User> userDatabase = new HashMap<>();
+    private final AtomicLong idGenerator = new AtomicLong(1);
+
     public static void main(String[] args) {
         SpringApplication.run(UserServiceApplication.class, args);
     }
 
-    @GetMapping("/hello")
-    public String hello() {
-        return "Hello from User Service!";
+    // Create a new user
+    @PostMapping
+    public User createUser(@RequestBody User user) {
+        long id = idGenerator.getAndIncrement();
+        user.setId(id);
+        userDatabase.put(id, user);
+        return user;
+    }
+
+    // Get a user by ID
+    @GetMapping("/{id}")
+    public User getUser(@PathVariable Long id) {
+        return Optional.ofNullable(userDatabase.get(id))
+                .orElseThrow(() -> new RuntimeException("User not found"));
+    }
+
+    // Update a user by ID
+    @PutMapping("/{id}")
+    public User updateUser(@PathVariable Long id, @RequestBody User updatedUser) {
+        if (!userDatabase.containsKey(id)) {
+            throw new RuntimeException("User not found");
+        }
+        updatedUser.setId(id);
+        userDatabase.put(id, updatedUser);
+        return updatedUser;
+    }
+
+    // Delete a user by ID
+    @DeleteMapping("/{id}")
+    public String deleteUser(@PathVariable Long id) {
+        if (userDatabase.remove(id) == null) {
+            throw new RuntimeException("User not found");
+        }
+        return "User deleted successfully";
+    }
+
+    // User entity
+    static class User {
+        private Long id;
+        private String name;
+        private String email;
+        private String role;
+
+        // Getters and setters
+        public Long getId() {
+            return id;
+        }
+
+        public void setId(Long id) {
+            this.id = id;
+        }
+
+        public String getName() {
+            return name;
+        }
+
+        public void setName(String name) {
+            this.name = name;
+        }
+
+        public String getEmail() {
+            return email;
+        }
+
+        public void setEmail(String email) {
+            this.email = email;
+        }
+
+        public String getRole() {
+            return role;
+        }
+
+        public void setRole(String role) {
+            this.role = role;
+        }
     }
 }