package com.uca.tecnoweb.servlet;

import java.io.*;
import java.util.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import net.sf.jasperreports.engine.*;

/**
 *
 * @author Byron
 */
public class ReportServlet 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 {
        // Introducir en el flujo de salida del servlet el PDF generado por el reporte.
        ServletOutputStream servletOutputStream = response.getOutputStream();
        InputStream reportStream = this.getServletConfig()
                                       .getServletContext()
                                       .getResourceAsStream("/WEB-INF/reports/listaAlumnos.jasper");
        // Conectividad para BD.
        String url = "jdbc:mysql://localhost:3306/academica";
        String driver = "com.mysql.jdbc.Driver";
        String usuario = "root";
        String clave = "root";

        // Para parámetros al reporte.
        HashMap params = new HashMap();
        String carnetAlumno = "00001234";
        params.put("CARNET_ALUMNO", carnetAlumno);

        try {
            // Cargar driver de RDBMS y establecer conexión.
            Class.forName(driver);
            Connection con = DriverManager.getConnection(url, usuario, clave);

            // Enviamos el Pdf del reporte a un flujo de salida, en este caso el flujo de salida del Servlet.
            JasperRunManager.runReportToPdfStream(reportStream, servletOutputStream, params, con);
            response.setContentType("application/pdf");

            //Cerramos la casa.
            con.close();
            reportStream.close();
            servletOutputStream.flush();
            servletOutputStream.close();
        } catch (JRException ex) { //JasperReports Exception
            ex.printStackTrace();
        } catch (SQLException ex) {
            ex.printStackTrace();
        } catch (ClassNotFoundException ex) {
            ex.printStackTrace();
        }
    }

    // <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>

}