Add CRUD operations for User entity

app(backend)/pom.xml

@@ -39,8 +39,9 @@
 			<artifactId>spring-boot-starter-security</artifactId>
 		</dependency>
 		<dependency>
-			<groupId>org.hibernate.orm</groupId>
+			<groupId>org.hibernate</groupId>
 			<artifactId>hibernate-envers</artifactId>
+			<version>6.4.4.Final</version>
 		</dependency>
 
 		<dependency>

app(backend)/src/main/java/com/knockoutzone/backend/controller/UserController.java

@@ -0,0 +1,52 @@
+package com.knockoutzone.backend.controller;
+
+import java.util.List;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.knockoutzone.backend.entity.User;
+import com.knockoutzone.backend.service.UserService;
+
+import lombok.RequiredArgsConstructor;
+
+@RestController
+@RequestMapping("/api/users")
+@RequiredArgsConstructor
+public class UserController {
+
+    private final UserService userService;
+
+    @PostMapping
+    public ResponseEntity<User> createUser(@RequestBody User user) {
+        return ResponseEntity.ok(userService.createUser(user));
+    }
+
+    @GetMapping("/{id}")
+    public ResponseEntity<User> getUser(@PathVariable Long id) {
+        return ResponseEntity.ok(userService.getUserById(id));
+    }
+
+    @GetMapping
+    public ResponseEntity<List<User>> getAllUsers() {
+        return ResponseEntity.ok(userService.getAllUsers());
+    }
+
+    @PutMapping("/{id}")
+    public ResponseEntity<User> updateUser(@PathVariable Long id, @RequestBody User user) {
+        return ResponseEntity.ok(userService.updateUser(id, user));
+    }
+
+    @DeleteMapping("/{id}")
+    public ResponseEntity<Void> deleteUser(@PathVariable Long id) {
+        userService.deleteUser(id);
+        return ResponseEntity.noContent().build();
+    }
+}

app(backend)/src/main/java/com/knockoutzone/backend/entity/Tournament.java

@@ -1,12 +1,32 @@
 package com.knockoutzone.backend.entity;
 
+import java.time.LocalDate;
 
-import com.knockoutzone.backend.entity.enums.*;
-import jakarta.persistence.*;
-import lombok.*;
 import org.hibernate.envers.Audited;
 
-import java.time.LocalDate;
+import com.fasterxml.jackson.annotation.JsonBackReference;
+import com.knockoutzone.backend.entity.enums.EventMode;
+import com.knockoutzone.backend.entity.enums.Platform;
+import com.knockoutzone.backend.entity.enums.ScheduleType;
+import com.knockoutzone.backend.entity.enums.TournamentStatus;
+import com.knockoutzone.backend.entity.enums.TournamentType;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.EnumType;
+import jakarta.persistence.Enumerated;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
 
 @Entity
 @Getter
@@ -23,6 +43,11 @@ public class Tournament extends AuditingEntity {
     private Long id;
     private String name;
 
+    @JsonBackReference
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "host_id", nullable = false)
+    private User host;
+
     @Column(length = 1000)
     private String description;
     private String location;

app(backend)/src/main/java/com/knockoutzone/backend/entity/User.java

@@ -0,0 +1,65 @@
+package com.knockoutzone.backend.entity;
+
+
+import org.hibernate.envers.Audited;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.CascadeType;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.fasterxml.jackson.annotation.JsonManagedReference;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+
+@Entity
+@Getter
+@Setter
+@NoArgsConstructor
+@AllArgsConstructor 
+@Builder
+@Audited(withModifiedFlag = true)
+@Table(name="users")
+public class User extends AuditingEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+
+    private String username;
+
+    private String email;
+
+    @JsonIgnore
+    private String password;
+
+    private String firstName;
+
+    private String lastName;
+
+    private String phoneNumber;
+
+    private String profilePictureUrl;
+
+    private Boolean isEmailVerified;
+
+    private Boolean isActive;
+
+    @OneToMany(mappedBy = "host", cascade = CascadeType.ALL, orphanRemoval = true)
+    @JsonManagedReference
+    private List<Tournament> tournamentsHosted = new ArrayList<>();
+
+}

app(backend)/src/main/java/com/knockoutzone/backend/entity/enums/EventMode.java

@@ -0,0 +1,7 @@
+package com.knockoutzone.backend.entity.enums;
+
+public enum EventMode {
+    ONLINE,
+    OFFLINE,
+    HYBRID
+}

app(backend)/src/main/java/com/knockoutzone/backend/entity/enums/Platform.java

@@ -0,0 +1,9 @@
+package com.knockoutzone.backend.entity.enums;
+
+public enum Platform {
+    PC,
+    CONSOLE,
+    MOBILE,
+    CROSS_PLATFORM,
+    OTHER
+}

app(backend)/src/main/java/com/knockoutzone/backend/entity/enums/ScheduleType.java

@@ -0,0 +1,8 @@
+package com.knockoutzone.backend.entity.enums;
+
+public enum ScheduleType {
+    FIXED_TIME,
+    FLEXIBLE_TIME,
+    ADMIN_SCHEDULED,
+    PLAYER_COORDINATED
+}

app(backend)/src/main/java/com/knockoutzone/backend/entity/enums/TournamentStatus.java

@@ -0,0 +1,9 @@
+package com.knockoutzone.backend.entity.enums;
+
+public enum TournamentStatus {
+    UPCOMING,
+    ONGOING,
+    COMPLETED,
+    CANCELLED,
+    POSTPONED
+}

app(backend)/src/main/java/com/knockoutzone/backend/entity/enums/TournamentType.java

@@ -0,0 +1,6 @@
+package com.knockoutzone.backend.entity.enums;
+
+public enum TournamentType {
+    SOLO, 
+    TEAM
+}

app(backend)/src/main/java/com/knockoutzone/backend/repository/UserRepository.java

@@ -0,0 +1,20 @@
+package com.knockoutzone.backend.repository;
+
+import java.util.Optional;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import com.knockoutzone.backend.entity.User;
+
+@Repository
+public interface UserRepository extends JpaRepository<User, Long> {
+
+    Optional<User> findByEmail(String email);
+
+    Optional<User> findByUsername(String username);
+
+    Boolean existsByEmail(String email);
+
+    Boolean existsByUsername(String username);
+}

app(backend)/src/main/java/com/knockoutzone/backend/service/UserService.java

@@ -0,0 +1,59 @@
+package com.knockoutzone.backend.service;
+
+import java.util.List;
+
+import org.springframework.stereotype.Service;
+
+import com.knockoutzone.backend.entity.User;
+import com.knockoutzone.backend.repository.UserRepository;
+
+import jakarta.persistence.EntityNotFoundException;
+import lombok.RequiredArgsConstructor;
+
+@Service
+@RequiredArgsConstructor
+public class UserService {
+
+    private final UserRepository userRepository;
+
+    public User createUser(User user) {
+        return userRepository.save(user);
+    }
+
+    public User getUserById(Long id) {
+        return userRepository.findById(id)
+                .orElseThrow(() -> new EntityNotFoundException("User not found with id: " + id));
+    }
+
+    public List<User> getAllUsers() {
+        return userRepository.findAll();
+    }
+
+    public User updateUser(Long id, User updatedUser) {
+        User existingUser = getUserById(id);
+        existingUser.setUsername(updatedUser.getUsername());
+        existingUser.setEmail(updatedUser.getEmail());
+        existingUser.setFirstName(updatedUser.getFirstName());
+        existingUser.setLastName(updatedUser.getLastName());
+        existingUser.setPhoneNumber(updatedUser.getPhoneNumber());
+        existingUser.setProfilePictureUrl(updatedUser.getProfilePictureUrl());
+        existingUser.setIsActive(updatedUser.getIsActive());
+
+        return userRepository.save(existingUser);
+    }
+
+    public void deleteUser(Long id) {
+        if (!userRepository.existsById(id)) {
+            throw new EntityNotFoundException("User not found with id: " + id);
+        }
+        userRepository.deleteById(id);
+    }
+
+    public boolean existsByEmail(String email) {
+        return userRepository.existsByEmail(email);
+    }
+
+    public boolean existsByUsername(String username) {
+        return userRepository.existsByUsername(username);
+    }
+}