package com.richard.control;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import com.richard.dto.*;
import com.richard.dao.*;
import com.richard.service.*;

public class EmployeeControl extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=GBK";

    //Initialize global variables
    public void init() throws ServletException {
    }

    //Process the HTTP Get request
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        response.setCharacterEncoding("GB2312");
        request.setCharacterEncoding("GB2312");
        response.setContentType(CONTENT_TYPE);
        String param = request.getParameter("param"); //接收param參數，用于判斷servlet處理何種操作
        InterfaceOfEmployee objEmployee = Factory.createEmployee();
        HttpSession objSession = request.getSession();
        if (param != null) { //判斷所接收參數不為空

            if (param.equals("query")) { //參數為query為執行查詢操作
                String pageNumber = request.getParameter("pageNumber"); //接收pageNumber參數，用于判斷分頁顯示內容
                if (pageNumber != null) {
                    if (pageNumber.equals("firstPage")) { //用于顯示第一頁

                        objSession.setAttribute("totalPages",
                                                objEmployee.totalPages());
                        ArrayList objArrayList = objEmployee.employeeQueryAll(
                                12, 1);
                        request.setAttribute("queryResult", objArrayList); //將返回的ArrayList傳遞給queryemployee.jsp頁面
                        request.setAttribute("currentPage", 1);
                        RequestDispatcher objDispatcher = request.
                                getRequestDispatcher(
                                        "context/queryemployee.jsp");
                        objDispatcher.forward(request, response);
                    } else if (pageNumber.equals("endPage")) {   //用于顯示最后一頁
                        ArrayList objArrayList = objEmployee.employeeQueryAll(
                                12, Integer.parseInt(objSession.getAttribute("totalPages").toString()));
                        request.setAttribute("queryResult", objArrayList); //將返回的ArrayList傳遞給queryemployee.jsp頁面
                        request.setAttribute("currentPage", Integer.parseInt(objSession.getAttribute("totalPages").toString())); //將返回的ArrayList傳遞給queryemployee.jsp頁面
                        RequestDispatcher objDispatcher = request.
                                getRequestDispatcher(
                                        "context/queryemployee.jsp");
                        objDispatcher.forward(request, response);

                    } else {
                        int queryPage = Integer.parseInt(pageNumber);
                        ArrayList objArrayList = objEmployee.
                                                 employeeQueryAll(12,
                                queryPage);
                        request.setAttribute("queryResult", objArrayList); //將返回的ArrayList傳遞給queryemployee.jsp頁面
                        request.setAttribute("currentPage", queryPage);
                        RequestDispatcher objDispatcher = request.
                                getRequestDispatcher(
                                        "context/queryemployee.jsp");
                        objDispatcher.forward(request, response);

                    }
                }
            }
            if (param.equals("update")) { //參數為update執行修改操作
                String updateId = request.getParameter("updateId");
                if (updateId != null) {
                    String employeeName=request.getParameter("updateName");
                    String password=request.getParameter("updatePassword");
                    request.setAttribute("updateId",updateId);
                    request.setAttribute("employeeName",employeeName);
                    request.setAttribute("password",password);
                    request.setAttribute("pageNumber",request.getParameter("pageNumber"));

                    RequestDispatcher objDispatcher=request.getRequestDispatcher("context/updateemployee.jsp");
                    objDispatcher.forward(request,response);
                }
                else
                {
                    RequestDispatcher objDispatcher=request.getRequestDispatcher("context/updateemployee.jsp");
                    objDispatcher.forward(request,response);
                }
            }

            if(param.equals("updateSave"))    //處理修改保存事件
            {
                int updateId=Integer.parseInt(request.getParameter("updateId"));
                String updateName=request.getParameter("employeeName");
                String password=request.getParameter("password");
                Employee employeeBean=new Employee();
                employeeBean.setId(updateId);
                employeeBean.setName(updateName);
                employeeBean.setPassword(password);
                Factory.createEmployee().employeeUpdate(employeeBean);
                String pageNumber=request.getParameter("pageNumber");

                RequestDispatcher objDispatcher=request.getRequestDispatcher("employeecontrol?param=query&pageNumber="+pageNumber);
                objDispatcher.forward(request,response);
            }

            if(param.equals("delete"))     //參數為delete時執行刪除操作
            {
                String deleteId = request.getParameter("deleteid");
                String queryPage=request.getParameter("pageNumber");
                if(deleteId!=null||queryPage!=null)
                {
                    Employee employeeBean=new Employee();
                    employeeBean.setId(Integer.parseInt(deleteId));
                    objEmployee.employeeDelete(employeeBean);
                    ArrayList objArrayList = objEmployee.
                                                 employeeQueryAll(15,
                                Integer.parseInt(queryPage));
                        request.setAttribute("queryResult", objArrayList); //將返回的ArrayList傳遞給queryemployee.jsp頁面
                        request.setAttribute("currentPage", queryPage);
                        objSession.setAttribute("totalPages",
                                                objEmployee.totalPages());
                        RequestDispatcher objDispatcher = request.
                                getRequestDispatcher(
                                        "context/queryemployee.jsp");
                        objDispatcher.forward(request, response);


                }
            }
        }
    }

    //Process the HTTP Post request
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        doGet(request, response);
    }

    //Clean up resources
    public void destroy() {
    }


}