package com.ingenieux.nullweblog.web;



import java.io.IOException;

import java.util.Collection;

import java.util.Date;



import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



import org.apache.abdera.Abdera;

import org.apache.abdera.factory.Factory;

import org.apache.abdera.model.Document;

import org.apache.abdera.model.Entry;

import org.apache.abdera.model.Feed;

import org.apache.commons.lang.StringUtils;



import com.google.inject.Inject;

import com.google.inject.Singleton;

import com.ingenieux.nullweblog.model.Post;

import com.ingenieux.nullweblog.model.Usuario;

import com.ingenieux.nullweblog.server.PostDao;

import com.ingenieux.nullweblog.server.UsuarioDao;



@Singleton

public class FeedServlet extends HttpServlet {

	private static final long serialVersionUID = 1124037781342748204L;



	@Inject

	PostDao postDao;



	@Inject

	UsuarioDao usuarioDao;



	@Override

	protected void service(HttpServletRequest req, HttpServletResponse resp)

			throws ServletException, IOException {

		String synthLogin = (String) req.getAttribute("synthLogin");

		Long postId = Long.valueOf(StringUtils.defaultString(

				(String) req.getAttribute("postId"), "0"));



		Usuario usuario = usuarioDao.findBySynthLogin(synthLogin);



		if (null == usuario) {

			resp.sendError(440, "User not found");

			return;

		}



		if (0 != postId) {

			Post post = postDao.findByAutorAndId(usuario, postId);



			resp.getWriter().write(post.getContent());

		} else {

			Document<Feed> doc = getFeed(usuario);



			doc.writeTo(resp.getOutputStream());

		}

	}



	public Document<Feed> getFeed(Usuario usuario) {

		Collection<Post> posts = postDao.findByAutor(usuario.getId());

		Factory abderaFactory = new Abdera().getFactory();

		Feed feedObj = abderaFactory.newFeed();



		feedObj.setId("nullweblog:2010:" + usuario.getId());

		feedObj.setTitle("Feed for "

				+ StringUtils.defaultString(usuario.getNome(),

						usuario.getLogin()));



		Date lastUpdated = usuario.getCreated();



		for (Post post : posts) {

			Entry entryObj = abderaFactory.newEntry();



			entryObj.setId("nullweblog:2010:" + usuario.getId() + ":"

					+ post.getId());

			entryObj.setTitle(post.getTitle());

			entryObj.setContent(post.getContent());

			entryObj.setPublished(post.getCreated());

			entryObj.setUpdated(post.getLastUpdated());



			if (lastUpdated.before(post.getLastUpdated()))

				lastUpdated = post.getLastUpdated();



			feedObj.addEntry(entryObj);

		}



		feedObj.setUpdated(lastUpdated);



		Document<Feed> doc = feedObj.getDocument();

		return doc;

	}

}