package com.ankurm.hibernatedemo.proxy;

import jakarta.persistence.Entity;
import jakarta.persistence.FetchType;
import jakarta.persistence.GeneratedValue;
import jakarta.persistence.GenerationType;
import jakarta.persistence.Id;
import jakarta.persistence.JoinColumn;
import jakarta.persistence.ManyToOne;
import jakarta.persistence.NamedAttributeNode;
import jakarta.persistence.NamedEntityGraph;
import jakarta.persistence.OneToMany;
import java.util.ArrayList;
import java.util.List;

/**
 * Backs docs/11-proxies-and-lazy-initialization.md (post 4870 rewrite). Two associations on purpose:
 *
 * <ul>
 *   <li>{@code publisher} -- {@code @ManyToOne} with the JPA-default fetch type, EAGER.
 *       Nothing in this class overrides it.</li>
 *   <li>{@code reviews} -- {@code @OneToMany}, explicitly LAZY, and the only attribute named
 *       in {@code Book.reviews-only}. This is the association the fetchgraph/loadgraph demo
 *       turns on and off.</li>
 * </ul>
 *
 * <p>With a {@code jakarta.persistence.loadgraph} hint carrying {@code Book.reviews-only},
 * {@code reviews} gets join-fetched AND {@code publisher} still gets its default EAGER join --
 * loadgraph only promotes attributes, it never demotes ones the mapping already marks EAGER.
 * With a {@code jakarta.persistence.fetchgraph} hint carrying the same named graph,
 * {@code reviews} still gets join-fetched, but {@code publisher} is forced down to LAZY (a
 * proxy, no join) even though the mapping says EAGER -- fetchgraph treats the graph as the
 * complete fetch plan, not an addition to the mapping's own defaults.
 */
@Entity
@NamedEntityGraph(name = "Book.reviews-only", attributeNodes = @NamedAttributeNode("reviews"))
public class ProxyBook {

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

    private String title;

    @ManyToOne
    @JoinColumn(name = "publisher_id")
    private ProxyPublisher publisher;

    @OneToMany(mappedBy = "book", fetch = FetchType.LAZY)
    private List<ProxyReview> reviews = new ArrayList<>();

    protected ProxyBook() {
        // JPA
    }

    public ProxyBook(String title, ProxyPublisher publisher) {
        this.title = title;
        this.publisher = publisher;
    }

    public Long getId() {
        return id;
    }

    public String getTitle() {
        return title;
    }

    public ProxyPublisher getPublisher() {
        return publisher;
    }

    public List<ProxyReview> getReviews() {
        return reviews;
    }
}