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/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/JSP_Servlet/Servlet.java to edit this template
 */
package Controllers;

import java.io.IOException;
import java.io.PrintWriter;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import DAL.DAO;
import Models.*;
import java.util.Map;

/**
 *
 * @author admin
 */
public class LoadDB extends HttpServlet {

    DAO d;

    public void init() {
        d = new DAO();
    }

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try ( PrintWriter out = response.getWriter()) {
            /* TODO output your page here. You may use following sample code. */
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet LoadDB</title>");
            out.println("<link rel = 'Stylesheet' href = 'css/mycss.css'>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet LoadDB at " + request.getContextPath() + "</h1>");
            d.loadStudent();
            d.loadDepart();
            String s = "<table>";
            s += "<tr>";
            s += "<th>ID</th>";
            s += "<th>Name</th>";
            s += "<th>Gender</th>";
            s += "<th>Department Name</th>";
            s += "<th>Age</th>";
            s += "<th>GPA</th>";
            s += "<th>Add</th>";
            s += "<th>Update</th>";
            s += "<th>Delete</th>";
            s += "</tr>";
            String idUpdate = "";
            if (request.getAttribute("Update") != null) {
                idUpdate = request.getAttribute("Update") + "";
            }
            Student stUpdate = null;
            for (Student st : d.getStd()) {
                if (idUpdate != "" && st.getId().equals(idUpdate)) {
                    stUpdate = st;
                }
                s += "<tr>";
                s += "<td>" + st.getId() + "</td>";
                s += "<td>" + st.getName() + "</td>";
                s += "<td>" + (st.isGender() ? "Male" : "Female") + "</td>";
                //           s += "<td><input type = 'checkbox'" + (st.isGender()?"checked":"")+ "</td>";  // dung check box
                s += "<td>" + d.getDepart().get(st.getDepartId()).getName() + "</td>";
                s += "<td>" + st.getAge() + "</td>";
                s += "<td>" + st.getGpa() + "</td>";
                s += "<td>" + st.getAdd() + "</td>";
                s += "<td><a href = 'LoadDB?type=1&id=" + st.getId() + "'>Update</a></td>";
                s += "<td><a href = 'LoadDB?type=0&id=" + st.getId() + "'>Delete</a></td>";
                s += "</tr>";
            }
            s += "</table>";
            out.println(s);
            out.print("<hr/>");
            out.println("<h1> Insert student </h1>");
            String id = stUpdate == null ? "" : stUpdate.getId();
            String name = stUpdate == null ? "" : stUpdate.getName();
            boolean gender = stUpdate == null ? true : stUpdate.isGender();
            String departId = stUpdate == null ? "SE" : stUpdate.getDepartId();
            int age = stUpdate == null ? 20 : stUpdate.getAge();
            String gpa = stUpdate == null ? "" : stUpdate.getGpa() + "";
            String Add = stUpdate == null ? "" : stUpdate.getAdd();
            String form = "";
            form += "<form action=\"LoadDB\" method='post'>\n"
                    + "            <table>\n"
                    + "                <tr>\n"
                    + "                    <td>ID</td>\n"
                    + "                    <td><input type='text' name ='id' value = '" + id + "'></td>\n"
                    + "                </tr>\n"
                    + "                <tr>\n"
                    + "                    <td>Name</td>\n"
                    + "                    <td><input type='text' name ='name' value = '" + name + "'></td>\n"
                    + "                </tr>\n"
                    + "                <tr>\n"
                    + "                    <td>Gender</td>\n"
                    + "                    <td><input type='radio' name ='gender' value = 'm' checked>Male &nbsp; <input type='radio' name ='gender' value = 'f'>Female</td>\n"
                    + "                </tr>\n"
                    + "                <tr>\n"
                    + "                    <td>Department</td>\n"
                    + "                    <td><select name = 'departId'>";
            for (Map.Entry<String, Department> en : d.getDepart().entrySet()) {
                String key = en.getKey();
                Department value = en.getValue();
                form += "<option value = " + key + " " + (key.equals(departId) ? "selected" : "") + ">" + value.getName() + "</option>";
            }
            form += "</select></td>\n"
                    + "                </tr>\n"
                    + "                <tr>\n"
                    + "                    <td>Age</td>\n"
                    + "                    <td><input type='number' name ='age' value = '" + age + "' min = 0 max = 150></td>\n"
                    + "                </tr>\n"
                    + "                <tr>\n"
                    + "                    <td>GPA</td>\n"
                    + "                    <td><input type='text' name ='gpa' value = '" + gpa + "'></td>\n"
                    + "                </tr>\n"
                    + "                <tr>\n"
                    + "                    <td>Address</td>\n"
                    + "                    <td><textarea name = 'add' rows='10' cols = '20'>" + Add + "</textarea></td>\n"
                    + "                </tr>\n"
                    + "            </table>\n"
                    + "            <input type='submit' value='Insert' name ='btnInsert'> &nbsp; &nbsp; \n"
                    + "<input type='submit' value='Update' name ='btnUpdate'> \n"
                    + "\n"
                    + "        </form>";

            out.print(form);
            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
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        Object o1 = request.getParameter("type");
        Object o2 = request.getParameter("id");
        if (o1 != null) {
            if ((o1 + "").equals("1")) {
                //update
                if (o2 != null) {
                    request.setAttribute("Update", o2 + "");
                } else {
                    request.removeAttribute("Update");
                }
            } else if ((o1 + "").equals("0")) {
                //delete
                if (o2 != null) {
                    d.del(o2 + "");
                }
            } else {
            }
        }
        d.loadDepart();
        d.loadStudent();
        int index = -1;
        int nrpp = 1;
        Object obj = request.getParameter("index");
        if (obj != null) {
            try {
                index = Integer.parseInt(obj + "");
                nrpp = Integer.parseInt(request.getAttribute("nrpp") + "");
            } catch (Exception e) {
            }
        }
        PagingModels page = new PagingModels(d.getStd().size(), nrpp, index);
        page.Calc();
        request.setAttribute("nrpp", nrppArr);
        request.setAttribute("page", page);
        request.setAttribute("stu", d.getStd());
        request.setAttribute("dept", d.getDepart());
        request.getRequestDispatcher("View/ViewDB.jsp").forward(request, response);
    }

    int[] nrppArr = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

    /**
     * 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 {

        Object obj = request.getParameter("Home");
        boolean btn = true;
        int nrpp = Integer.parseInt(request.getParameter("nrpp"));
        int index = Integer.parseInt(request.getParameter("index"));
        int totalPage = Integer.parseInt(request.getParameter("totalPage"));

        if (obj != null) {//button Home clicked
            index = 0;
            btn = false;
        } else if (request.getParameter("End") != null) {//click end
            index = totalPage - 1;
            btn = false;
        } else if (request.getParameter("Prev") != null) {//click prev
            index -= 1;
            btn = false;
        } else if (request.getParameter("Next") != null) {//click next
            index += 1;
            btn = false;
        } else if (btn) {
            for (int i = 0; i < totalPage; i++) {
                if (request.getParameter("btn" + i) != null) {
                    index = i;
                    btn = false;
                    break;
                }
            }
        }
        request.setAttribute("index", index);
        request.setAttribute("nrpp", nrpp);
        if (btn) {
            String id = request.getParameter("id");
            String name = request.getParameter("name");
            boolean gender = request.getParameter("gender").equals("m");
            String departId = request.getParameter("departId");
            int age = Integer.parseInt(request.getParameter("age"));
            double gpa = Double.parseDouble(request.getParameter("gpa"));
            String add = request.getParameter("add");
            boolean checkAdd = true;
            for (Student st : d.getStd()) {
                if (st.getId().equals(id)) {
                    checkAdd = false;
                }
            }
            Object o1 = request.getParameter("btnInsert");
            Object o2 = request.getParameter("btnUpdate");
            if (o1 != null) {
                if (checkAdd) {
                    d.insert(id, name, gender, departId, age, gpa, add);
                } else {
                    d.update(id, name, gender, departId, age, gpa, add);
                }
            }
            if(o2 != null){
                if(checkAdd){
                    d.insert(id, name, gender, departId, age, gpa, add);
                }else{
                    d.update(id, name, gender, departId, age, gpa, add);
                }
            }
            doGet(request, response);
        }
    }

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

}