package com.yunhai.campusnotice.entity;

import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.NoArgsConstructor;

import javax.persistence.*;
import java.time.LocalDateTime;

/**
 * 通知阅读记录（懒标记）。对应原 .NET Notify_ReceiveList 的「逐用户阅读状态」语义，
 * 但仅在读者首次查看时落库，避免发通知时预插全员。
 * <p>
 * 唯一约束 (notice_id, reader_account)：同一用户对同一通知只记一条已读。
 */
@NoArgsConstructor
@Data
@Entity
@Table(name = "notice_read",
        uniqueConstraints = @UniqueConstraint(
                name = "uk_notice_reader",
                columnNames = {"notice_id", "reader_account"}))
@EqualsAndHashCode(onlyExplicitlyIncluded = true, callSuper = false)
public class NoticeRead extends BaseEntity {

    /**
     * 通知ID（关联 notice.id）
     */
    @Column(name = "notice_id", nullable = false)
    private Integer noticeId;

    /**
     * 读者登录账号
     */
    @Column(name = "reader_account", nullable = false, length = 64)
    private String readerAccount;

    /**
     * 读者姓名
     */
    @Column(name = "reader_name", length = 64)
    private String readerName;

    /**
     * 阅读时间
     */
    @Column(name = "read_time")
    private LocalDateTime readTime;

    // ==================== 阅读身份快照（改造方案 2.3，学员阅读时带出） ====================

    /** 学校ID（取通知 sch_id） */
    @Column(name = "sch_id")
    private Integer schId;

    /** 年级ID快照 */
    @Column(name = "grade_id")
    private Integer gradeId;

    /** 年级名称快照 */
    @Column(name = "grade_name", length = 128)
    private String gradeName;

    /** 班级ID快照 */
    @Column(name = "class_id")
    private Integer classId;

    /** 班级名称快照 */
    @Column(name = "class_name", length = 128)
    private String className;
}