hit-server-manager/backend/src/main/java/com/hitcommunications/servermanager/model/Users.java

package com.hitcommunications.servermanager.model;

import jakarta.persistence.*;
import lombok.*;
import org.hibernate.annotations.CreationTimestamp;
import org.hibernate.annotations.UpdateTimestamp;

import java.sql.Timestamp;
import java.util.UUID;

@Entity
@Table(name = "tab_users")
@AllArgsConstructor
@NoArgsConstructor
@Getter
@Setter
@Builder
public class Users {

    @Id
    @GeneratedValue(strategy = GenerationType.UUID)
    @Column(updatable = false, nullable = false)
    private UUID id;

    @Column(nullable = false, unique = true)
    private String username;

    @Column(nullable = false, unique = true, length = 100)
    private String email;

    @Column(nullable = false, length = 120)
    private String password;

    @Column(nullable = false, length = 30)
    private String firstName;

    @Column(nullable = false, length = 30)
    private String lastName;

    @CreationTimestamp
    @Column(nullable = false)
    private Timestamp createdAt;

    @UpdateTimestamp
    @Column(nullable = false)
    private Timestamp updatedAt;

    private Timestamp lastLogin;

    @PrePersist
    private void prePersist() {
        if (this.username == null) {
            this.username = generateUsername();
        }
    }

    public String generateUsername() {
        String firstPart = this.firstName != null && this.firstName.length() >= 3 ? this.firstName.substring(0, 3) : (this.firstName != null ? this.firstName : "");
        String secondPart = this.lastName != null && this.lastName.length() >= 3 ? this.lastName.substring(0, 3) : (this.lastName != null ? this.lastName : "");
        this.username = firstPart + secondPart;
        return this.username.toLowerCase();
    }
}