package org.lidar;

import com.google.gson.Gson;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.lidar.HibernateUtil;

/**
 * Log Servlet
 * @author Andrej Cimpersek
 */
public class LogServlet extends HttpServlet {

    /**
     * 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("application/json;charset=UTF-8");
        PrintWriter out = response.getWriter();
        Gson gson = new Gson();
        try {
            int start = 0;
            int limit = 15;
            if (request.getParameter("limit") != null) {
                limit = Integer.parseInt(request.getParameter("limit"));
            }
            if (request.getParameter("start") != null) {
                start = Integer.parseInt(request.getParameter("start"));
            }

            Session session = HibernateUtil.getSessionFactory().getCurrentSession();
            Transaction tx = session.beginTransaction();

            // FIX: use COUNT instead
            int total = session.createQuery("from Log as log").list().size();
            Query query = session.createQuery("from Log as log order by log.date desc");
            query.setFirstResult(start);
            query.setMaxResults(limit);
            JSONResponse resp = new JSONResponse(true, total, (ArrayList) query.list());
            out.write(gson.toJson(resp));
            tx.commit();
        } catch (Exception e) {
            response.setContentType("text/plain;charset=UTF-8");
            out.write(e.getMessage());
        } finally {
            out.close();
        }
    }

    class JSONResponse {

        private boolean success = true;
        private int total;
        private ArrayList rows;

        public JSONResponse(boolean success, int total, ArrayList rows) {
            this.success = success;
            this.total = total;
            this.rows = rows;
        }
    }

    // <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
     */
    @Override
    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
     */
    @Override
    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
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}