package com.yaoyuan.jiscuss.entity;

import jakarta.persistence.*;
import lombok.Data;

import java.io.Serializable;
import java.util.Date;

@Data
@Entity
@Table(name = "message")
public class Message implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    @Column(name = "sender_id", nullable = false)
    private Integer senderId;

    @Column(name = "receiver_id", nullable = false)
    private Integer receiverId;

    @Column(name = "content", columnDefinition = "TEXT", nullable = false)
    private String content;

    @Column(name = "is_read")
    private Boolean isRead = false;

    @Column(name = "create_time")
    private Date createTime;

    /**
     * Conversation identifier = "min(a,b)_max(a,b)", groups all messages
     * between two users into a single conversation thread.
     */
    @Column(name = "conversation_id", nullable = false)
    private String conversationId;
}