package nju.seec.SEECdemo.data.entity;

import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.ToString;
import nju.seec.SEECdemo.data.entity.assignment.Code;
import nju.seec.SEECdemo.data.user.User;
import org.hibernate.annotations.LazyCollection;
import org.hibernate.annotations.LazyCollectionOption;

import javax.persistence.*;
import java.util.HashSet;
import java.util.Set;

@Data
@EqualsAndHashCode(exclude = {"codeSet", "groupSet", "creator"})
@ToString(exclude = {"codeSet", "groupSet", "creator"})
@Entity
@Table(name = "ENTITY_COURSE")
public class Course {

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

    @Basic
    @Column(name = "name", nullable = false)
    private String name;

    @ManyToOne(targetEntity = User.class, fetch = FetchType.LAZY)
    @JoinColumn(name = "creator", referencedColumnName = "id")
    private User creator;

    @OneToMany(targetEntity = Code.class, mappedBy = "course", cascade = CascadeType.REMOVE)
    @LazyCollection(LazyCollectionOption.EXTRA)
    private Set<Code> codeSet = new HashSet<>();

    @ManyToMany(targetEntity = User.class, cascade = CascadeType.DETACH)
    @JoinTable(name = "LINK_USER_COURSE",
            joinColumns = @JoinColumn(name = "course", referencedColumnName = "id"),
            inverseJoinColumns = @JoinColumn(name = "user", referencedColumnName = "id")
    )
    @LazyCollection(LazyCollectionOption.EXTRA)
    private Set<User> memberSet = new HashSet<>();

    @OneToMany(targetEntity = Group.class, mappedBy = "course", cascade = CascadeType.REMOVE)
    @LazyCollection(LazyCollectionOption.EXTRA)
    private Set<Group> groupSet = new HashSet<>();

}