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package org.javaee7.jpa.pu.typesafe;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.inject.Inject;
import javax.persistence.EntityManager;
import javax.persistence.TypedQuery;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author Arun Gupta
 */
@WebServlet(urlPatterns = {"/TestServlet"})
public class TestServlet extends HttpServlet {

    @Inject MySessionBean bean;
    
    /**
     * Processes requests for both HTTP
     * <code>GET</code> and
     * <code>POST</code> methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet TestServlet</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Typesafe injection of Persistence Unit</h1>");

            out.println("--> Listing movies<br>");
            for (Movie m : bean.listMovies()) {
                out.println(m.getName() + "<br>");
            }
            out.println("</body>");
            out.println("</html>");
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

    private void listMovies(CriteriaBuilder builder, EntityManager em, PrintWriter out) {
        CriteriaQuery listCriteria = builder.createQuery(Movie.class);
        Root<Movie> listRoot = listCriteria.from(Movie.class);
        listCriteria.select(listRoot);
        TypedQuery<Movie> query = em.createQuery(listCriteria);
        List<Movie> list = query.getResultList();
        for (Movie m : list) {
            out.println(m.getName() + "<br>");
        }
    }
}