package model.entity;
   
   import lombok.Getter;
   
   import javax.persistence.*;
   import java.io.Serializable;
   import java.time.Instant;
   import java.util.Objects;
   
  /**
   * Entità rappresentate una relazione "segui" tra un utente e una sezione
   */
  @Entity
  public class Follow implements Serializable {
  
      @Embeddable
      public static class Id implements Serializable{
  
          @Getter
          @Column(name = "user_id", nullable = false)
          protected int userId;
  
          @Getter
          @Column(name = "section_id", nullable = false)
          protected int sectionId;
  
          protected Id(){}
  
          public Id(int userId, int sectionId){
              this.userId = userId;
              this.sectionId = sectionId;
          }
  
          @Override
          public boolean equals(Object o) {
              if (this == o) return true;
              if (!(o instanceof Id)) return false;
              Id id = (Id) o;
              return userId == id.userId && sectionId == id.sectionId;
          }
  
          @Override
          public int hashCode() {
              return Objects.hash(userId, sectionId);
          }
      }
  
      @Getter
      @EmbeddedId
      protected Id id = new Id();
  
      @Getter
      @ManyToOne(optional = false) @MapsId("userId")
      protected User user;
      public void setUser(User user){
          this.user = user;
          this.id.userId = user.getId();
      }
  
      @Getter
      @ManyToOne(optional = false) @MapsId("sectionId")
      protected Section section;
      public void setSection(Section section){
          this.section = section;
          this.id.sectionId = section.getId();
      }
  
      @Getter
      @Column(nullable = false, updatable = false, insertable = false)
      protected Instant followDate;
  
      protected Follow(){}
  
      public Follow(User user, Section section){
          this.user = user;
          this.section = section;
          this.id = new Id(user.getId(), section.getId());
      }
  
  
      @Override
      public boolean equals(Object o) {
          if (this == o) return true;
          if (!(o instanceof Follow)) return false;
          Follow follow = (Follow) o;
          return id.equals(follow.id);
      }
  
      @Override
      public int hashCode() {
          return Objects.hash(id);
      }
  }