package models;

 import java.util.*;

 import javax.persistence.*;

 import play.db.jpa.*;

 import play.data.validation.*;

 @Entity

 public class Post extends Model {

     @Required

     public String title;

     @Required

     public Date postedAt;

     @Lob

     @Required

     @MaxSize(10000)

     public String content;

     @Required

     @ManyToOne

     public User author;

     @OneToMany(mappedBy = "post", cascade = CascadeType.ALL)

     public List<Comment> comments;

     @ManyToMany(cascade = CascadeType.PERSIST)

     public Set<Tag> tags;

     public Post(User author, String title, String content) {

         this.comments = new ArrayList<Comment>();

         this.tags = new TreeSet();

         this.author = author;

         this.title = title;

         this.content = content;

         this.postedAt = new Date();

     }

     public Post addComment(String author, String content) {

         Comment newComment = new Comment(this, author, content);

         this.comments.add(newComment);

         this.save();

         return this;

     }

     public Post previous() {

         return Post.find("postedAt < ? order by postedAt desc", postedAt).first();

     }

     public Post next() {

         return Post.find("postedAt > ? order by postedAt asc", postedAt).first();

     }

     public Post tagItWith(String name) {

         tags.add(Tag.findOrCreateByName(name));

         return this;

     }

     public static List<Post> findTaggedWith(String tag) {

         return Post.find(

                 "select distinct p from Post p join p.tags as t where t.name = ?",

                 tag

         ).fetch();

     }

     public static List<Post> findTaggedWith(String... tags) {

         return Post.find(

                 "select distinct p from Post p join p.tags as t where t.name in (:tags) group by p.id, p.author, p.title, p.content,p.postedAt having count(t.id) = :size"

         ).bind("tags", tags).bind("size", tags.length).fetch();

     }

     public String toString() {

         return title;

     }

 }