package model.entity;
   
   import lombok.Getter;
   import lombok.Setter;
   import org.hibernate.annotations.DynamicUpdate;
   import org.hibernate.annotations.LazyCollection;
   import org.hibernate.annotations.LazyCollectionOption;
   
   import javax.persistence.*;
  import java.io.Serializable;
  import java.time.Instant;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  /**
   * Entità rappresentante un post
   */
  @Entity
  @DynamicUpdate
  public class Post implements Serializable {
      public enum Type {TEXT, IMG}
  
      @Getter @Setter
      @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
      protected Integer id;
  
      @Setter @Getter
      @Column(length = 255, nullable = false)
      protected String title;
  
      @Getter @Setter
      @Column(columnDefinition = "TEXT", nullable = false)
      protected String content;
  
      @Setter @Getter
      @Column(nullable = false) @Enumerated(EnumType.STRING)
      protected Type type;
  
      @Getter
      @Column(nullable = false, updatable = false, insertable = false)
      protected Instant creationDate; //generato da sql
  
      @Getter
      @Column(name = "votes", nullable = false, insertable = false, updatable = false)
      protected Integer votesCount;
  
      @OneToMany(mappedBy="post")
      @LazyCollection(LazyCollectionOption.EXTRA)
      protected List<Comment> comments;
      public int getCommentCount(){
          return comments == null ? 0 : comments.size();
      }
  
      @Getter @Setter
      @ManyToOne(fetch = FetchType.LAZY, optional = false)
      protected Section section;
  
      @Getter @Setter
      @ManyToOne(fetch = FetchType.LAZY, optional = false)
      protected User author;
  
      @OneToMany(mappedBy="post")
      @MapKeyJoinColumn(name="user_id", updatable = false, insertable = false)
      protected Map<User, PostVote> votes = new HashMap<>();
  
      /**
       * Ottieni il voto di un utente al post in questione (o <pre>null</pre> se il voto non è presente)
       * @param user Riferimento all'utente
       * @return Un oggetto {@link PostVote}
       */
      public PostVote getVote(User user){
          return votes.get(user);
      }
  
      public Post(){}
  
      @Override
      public boolean equals(Object o) {
          if (this == o) return true;
          if (!(o instanceof Post)) return false;
          Post post = (Post) o;
          return id != null && id.equals(post.id);
      }
  
      @Override
      public int hashCode() {
          return getClass().hashCode();
      }
  }