package stat;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.text.SimpleDateFormat;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.xy.XYDataset;

public class StatServlet
    extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=UTF-8";

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

    /**
     * 判斷是哪種操作
     * 1，forum_delete：刪除討論區
     * 2，forum_add：新增討論區
     * 3，forum_update：更新討論區
     * 4，forum_select：獲取討論區列表
     * 5，forum_view：獲取某一個討論區詳細信息
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws
        ServletException, IOException {
        String type = request.getParameter("type");
        if (type == null) {
            return;
        }
        else if (type.equalsIgnoreCase("dayStat")) { //每日訪問量統計
            dayStat(request, response);
        }
        else if (type.equalsIgnoreCase("monthStat")) { //每月訪問量統計
            monthStat(request, response);
        }
        else if (type.equalsIgnoreCase("hourStat")) { //每個時間段訪問量統計
            hourStat(request, response);
        }
        else if (type.equalsIgnoreCase("browserStat")) { //客戶端瀏覽器統計
            browserStat(request, response);
        }
        else if (type.equalsIgnoreCase("osStat")) { //客戶端操作系統統計
            osStat(request, response);
        }
    }
    /**
     * 處理日流量統計
     * 1，獲得要統計多少天的流量
     * 2，調用StatHandle的getDayStat方法，獲取數據集
     * 3，將數據集保存在session中
     * 4，如果出現異常，將異常信息保存到request對象中
     * 5，如果操作成功，返回line.jsp頁面
     * 6，否則返回error.jsp頁面
     */
    private void dayStat(HttpServletRequest request,
                         HttpServletResponse response) {
        boolean isSuccess = false;
        //操作成功失敗標記
        try {
            isSuccess = true;
            int count = Integer.parseInt(request.getParameter("dayCounts"));
            //從請求頭中獲取dayCounts，該參數表示要統計多少天的流量
            XYDataset data = StatHandle.getDayStat(count);
            //調用StatHandle的getDayStat方法從數據庫中獲取每天的訪問次數并保存在數據集中
            request.getSession().setAttribute("dataset", data);
            //將數據集保存在session對象中，便于外部程序使用
        }
        catch (Exception es) {
            es.printStackTrace();
            isSuccess = false;
            request.setAttribute("error", es.getMessage());
            //如果出現異常，將錯誤信息保存在request對象的error變量中
        }
        String forward = null;
        if (isSuccess) {
            request.removeAttribute("error");
            forward = "day.jsp";
            //如果操作成功，流程轉至line.jsp頁面
        }
        else {
            forward = "error.jsp";
            //如果操作失敗，流程轉至error.jsp頁面
        }
        forward(request, response, forward);
        //轉發請求
    }

    private void monthStat(HttpServletRequest request,
                           HttpServletResponse response) {
        boolean isSuccess = false;
        try {
            isSuccess = true;
            int count = Integer.parseInt(request.getParameter("monthCounts"));
            DefaultCategoryDataset data = StatHandle.getMonthStat(count);
            request.getSession().setAttribute("dataset", data);
        }
        catch (Exception es) {
            es.printStackTrace();
            isSuccess = false;
            request.setAttribute("error", es.getMessage());
        }
        String forward = null;
        if (isSuccess) {
            request.removeAttribute("error");
            forward = "month.jsp";
        }
        else {
            forward = "error.jsp";
        }
        forward(request, response, forward);
    }

    private void hourStat(HttpServletRequest request,
                          HttpServletResponse response) {
        boolean isSuccess = false;
        try {
            isSuccess = true;
            int dayCounts = Integer.parseInt(request.getParameter("dayCounts"));
            int count = Integer.parseInt(request.getParameter("count"));
            DefaultCategoryDataset data = StatHandle.getHourStat(dayCounts,
                count);
            request.getSession().setAttribute("dataset", data);
        }
        catch (Exception es) {
            es.printStackTrace();
            isSuccess = false;
            request.setAttribute("error", es.getMessage());
        }
        String forward = null;
        if (isSuccess) {
            request.removeAttribute("error");
            forward = "hour.jsp";
        }
        else {
            forward = "error.jsp";
        }
        forward(request, response, forward);
    }

    private void osStat(HttpServletRequest request,
                        HttpServletResponse response) {
        boolean isSuccess = false;
        try {
            isSuccess = true;
            DefaultPieDataset data = StatHandle.getosStat();
            request.getSession().setAttribute("dataset", data);
        }
        catch (Exception es) {
            es.printStackTrace();
            isSuccess = false;
            request.setAttribute("error", es.getMessage());
        }
        String forward = null;
        if (isSuccess) {
            request.removeAttribute("error");
            forward = "os.jsp";
        }
        else {
            forward = "error.jsp";
        }
        forward(request, response, forward);
    }

    private void browserStat(HttpServletRequest request,
                             HttpServletResponse response) {
        boolean isSuccess = false;
        try {
            isSuccess = true;
            DefaultPieDataset data = StatHandle.getbrowserStat();
            request.getSession().setAttribute("dataset", data);
        }
        catch (Exception es) {
            es.printStackTrace();
            isSuccess = false;
            request.setAttribute("error", es.getMessage());
        }
        String forward = null;
        if (isSuccess) {
            request.removeAttribute("error");
            forward = "browser.jsp";
        }
        else {
            forward = "error.jsp";
        }
        forward(request, response, forward);
    }

    /**
     * 將控制流程轉到url所表示的頁面
     * @param url String 要轉到的頁面
     */
    private void forward(HttpServletRequest request,
                         HttpServletResponse response, String url) {
        try {
            request.getRequestDispatcher(response.encodeURL(url)).
                forward(request, response);
        }
        catch (Exception es) {
            es.printStackTrace();
        }
    }

//    127.0.0.1
//    /stat/statservlet
//    HTTP/1.1
//    127.0.0.1
//    127.0.0.1
//    /statservlet
//    127.0.0.1
//    null
//    null
//    /stat
//    type=dayStat&dayCounts=5
//    http://127.0.0.1/stat/statservlet
//    /stat/statservlet

    public static void doGet(HttpServletRequest request) {
        System.out.println(request.getMethod()); // GET
        System.out.println(request.getRequestURI()); // /stat/statservlet
        System.out.println(request.getProtocol()); // HTTP/1.1
        System.out.println(request.getRemoteAddr()); // 127.0.0.1
        System.out.println(request.getRemoteHost()); // 127.0.0.1

        System.out.println(request.getServletPath()); // 127.0.0.1
        System.out.println(request.getServerName()); // 127.0.0.1
        System.out.println(request.getServerPort()); // 127.0.0.1

        System.out.println(request.getPathInfo()); // 127.0.0.1
        System.out.println(request.getPathTranslated()); // 127.0.0.1
        System.out.println(request.getContextPath()); // 127.0.0.1

        System.out.println(request.getQueryString()); // 127.0.0.1
        System.out.println(request.getRequestURL().toString()); // 127.0.0.1
        System.out.println(request.getRequestURI()); // 127.0.0.1

        Enumeration headerNames = request.getHeaderNames();

        while (headerNames.hasMoreElements()) {
            String headerName = (String) headerNames.nextElement();
            System.out.println(headerName + "-----" +
                               request.getHeader(headerName));
        }

        String Agent = request.getHeader("User-Agent");
        StringTokenizer st = new StringTokenizer(Agent, ";");
        st.nextToken();
        //得到用戶的瀏覽器名
        String userbrowser = st.nextToken();
        //得到用戶的操作系統名
        String useros = st.nextToken();
    }

//     accept-----*/*
//     accept-language-----zh-cn
//     accept-encoding-----gzip, deflate
//     user-agent-----Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)
//     host-----127.0.0.1
//     connection-----Keep-Alive

}