package nju.seec.helper.entity;

import lombok.Data;
import lombok.experimental.Accessors;
import org.hibernate.annotations.*;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.ForeignKey;
import javax.persistence.Table;
import javax.persistence.*;
import java.time.LocalDateTime;

/**
 * @author cst
 */
@Data
@Accessors(chain = true)
@Entity
@Table(name = "course", uniqueConstraints = @UniqueConstraint(name = "course_name_unique", columnNames = {"delete_at", "teacher_id", "name"}))
@DynamicUpdate
@DynamicInsert
@Where(clause = "delete_at = 0")
@Cacheable
@org.hibernate.annotations.Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
public class Course {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(nullable = false)
    private String name;

    @Column(nullable = false)
    private String bio;

    @Column(nullable = false)
    private String code;

    @Column(name = "create_at", nullable = false, updatable = false)
    @CreationTimestamp
    private LocalDateTime createAt;

    @ManyToOne(cascade = {CascadeType.DETACH, CascadeType.MERGE, CascadeType.REFRESH}, fetch = FetchType.LAZY)
    @JoinColumn(name = "teacher_id", nullable = false, foreignKey = @ForeignKey(name = "course_teacher"))
    private User teacher;

    @ColumnDefault("0")
    @Column(name = "delete_at", nullable = false)
    private Long deleteAt = 0L;
}