package uia.lss.web;
import java.io.PrintWriter;
import java.util.List;
import javax.annotation.Resource;
import javax.persistence.Query;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceUnit;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.transaction.UserTransaction;
import uia.lss.data.Exercise;
import uia.lss.data.Feedback;
import uia.lss.data.User;
import uia.lss.data.Role;
/**
 *
 * @author bendo
 */

@WebServlet(name="feedbackview", urlPatterns="/feedbackview")
public class FeedbackView extends Page {

   public static final String SERVLET_NAME = "feedbackview";

@PersistenceUnit
protected EntityManagerFactory emf;
@Resource
protected UserTransaction utx;

    public void writeBody(PrintWriter out, HttpServletRequest req) {

        User user = getSessionUser(null, req);





        if (user.getRole() == Role.STUDENT) {



        if (getExerciseID(req) == 0) {
            out.println("<h3>Click on one of the exercise ID's  below to view the its feedback.</h3>");
            out.println("<br");

            EntityManager em = emf.createEntityManager();

            Query q = em.createQuery("select f from Feedback as f"
                    + " where f.exercise.userName = :name");
            q.setParameter("name", user.getUserName());
            List<Feedback> fb = q.getResultList();

     for (Feedback f : fb) {

     if (getRead(req) != null) {
     if (f.getRead() == false) {
      out.println("<p><a href=\"?exerciseid="+f.getExercise().getExerciseID()+"\">Exercise "+f.getExercise().getExerciseID()+"</a></p>");
                }

            }
 else  {
         out.println("<p><a href=\"?exerciseid="+f.getExercise().getExerciseID()+"\">Exercise "+f.getExercise().getExerciseID()+"</a></p>");
 }
            }
    }


    if (getExerciseID(req) > 0) {

        EntityManager em = emf.createEntityManager();
        Feedback feedback = em.find(Feedback.class, getExerciseID(req));

        out.println("<h1>Feedback for exercise " +getExerciseID(req)+"</h1>");

        out.println("<br>"); out.println("<br>");
        out.println("<p><b>Evaluator: </b>"+ feedback.getEvaluator().getFirstName()+" "
                + feedback.getEvaluator().getLastName()+"</p>");

        out.println("<br>");
        out.println("<p><b>Comment: </b></p><i>"+ feedback.getComment()+"</i>");
        out.println("<br>");

        if (feedback.getApproved() == true){
        out.println("<br>");
        out.println("<p><b>Verdict: </b>Approved</p>");
        }
        else {
            out.println("<br>");
            out.println("<p><b>Verdict: </b>Not approved</p>");
        }
        Query q = em.createQuery("UPDATE Feedback f SET f.isRead = :read WHERE f.exercise.exerciseID = :id");
        q.setParameter("id", getExerciseID(req));
        q.setParameter("read", true);

    out.println("<br>");
    out.println("<br>");
    out.println("<p><a href=\"feedbackview?exerciseid=0\">[Back]</a></p>");
    }


        }




        else {
            out.println("<h1>You do not have access to this page</h1>");
        }







    }

   public int getExerciseID(HttpServletRequest req) {

                String p = req.getParameter("exerciseid");
                int eID = Integer.parseInt(p);

                return eID;
    }

   public String getRead(HttpServletRequest req) {

       String r = req.getParameter("read");
       return r;
    }



}