OpenIsle/backend/src/main/java/com/openisle/model/MessageConversation.java

package com.openisle.model;

import com.fasterxml.jackson.annotation.JsonBackReference;
import com.fasterxml.jackson.annotation.JsonManagedReference;
import jakarta.persistence.*;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
import org.hibernate.annotations.CreationTimestamp;

import java.time.LocalDateTime;
import java.util.HashSet;
import java.util.Set;

@Entity
@Getter
@Setter
@NoArgsConstructor
@Table(name = "message_conversations")
public class MessageConversation {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    // Indicates whether this conversation represents a public channel
    @Column(nullable = false)
    private boolean channel = false;

    // Channel metadata
    private String name;

    @Column(columnDefinition = "TEXT")
    private String description;

    private String avatar;

    @CreationTimestamp
    @Column(nullable = false, updatable = false)
    private LocalDateTime createdAt;

    @OneToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "last_message_id")
    private Message lastMessage;

    @OneToMany(mappedBy = "conversation", cascade = CascadeType.ALL, orphanRemoval = true)
    @JsonBackReference
    private Set<MessageParticipant> participants = new HashSet<>();

    @OneToMany(mappedBy = "conversation", cascade = CascadeType.ALL, orphanRemoval = true)
    @JsonBackReference
    private Set<Message> messages = new HashSet<>();
}