import EMF;
import Dog;

import com.google.appengine.api.datastore.Key;
import com.google.appengine.api.datastore.KeyFactory;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import javax.persistence.EntityManager;
import javax.persistence.Query;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

public class ListFriendsServlet extends HttpServlet {

    @SuppressWarnings("unchecked")
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String keyString = request.getParameter("friend");
        Key key = KeyFactory.stringToKey(keyString);

        EntityManager em = EMF.get().createEntityManager();
        PrintWriter out = response.getWriter();

        List<Dog> dogs;

        try {

            Query query = em.createQuery("SELECT FROM Dog WHERE dogFriends = :key");
            query.setParameter("key", key);
            dogs = (List<Dog>) query.getResultList();

            dogs.size();  // Do this so we can eager load the list and close the EMF
        } finally {
            em.close();
        }

        out.println("Listing dogs");
        for(Dog dog : dogs) {
            out.println(dog);
        }
    }
}