package blog.blogEntry;

import java.io.*;
import java.util.logging.*;
import javax.enterprise.context.*;
import javax.enterprise.inject.*;
import javax.inject.*;

import blog.common.*;
import blog.security.*;
import blog.user.*;

@Named @ConversationScoped
public class BlogEntryService implements Serializable
{
   private static final long serialVersionUID = 1L;

   @Inject private Logger log; // just for demonstration, not actually useful
   @Inject private Conversation conversation; // for demonstration; @javax.faces.view.ViewScoped is better
   @Inject private Database db;
   @Inject @CurrentUser private User user;

   private Long id;
   private BlogEntry instance;

   public Long getId() { return id; }

   public void setId(Long id)
   {
      beginConversation();

      log.info("set blog entry id " + id);
      this.id = id;
   }

   @Produces
   public BlogEntry getInstance()
   {
      if (instance == null || id != null && !id.equals(instance.getId())) {
         instance = db.find(BlogEntry.class, id);
      }

      log.info("return blog entry " + instance);
      return instance;
   }

   public void newInstance()
   {
      beginConversation();

      BlogEntry blogEntry = new BlogEntry();
      blogEntry.setAuthor(user);
      instance = blogEntry;
      id = null;
   }

   private void beginConversation()
   {
      if (conversation.isTransient()) {
         conversation.begin();
         log.info("beginConversation conversation with id " + conversation.getId());
      }
   }

   private void endConversation()
   {
      if (!conversation.isTransient()) {
         conversation.end();
      }
   }

   public void save()
   {
      id = db.save(instance);
   }

   public void delete()
   {
      log.info("delete blog entry " + instance);
      db.remove(instance);
      endConversation();
   }
}