package com.moon.server.helper;

import com.alibaba.fastjson.JSON;
import com.moon.server.entity.all.HttpStatus;
import com.moon.server.entity.all.ResponseMsg;
import com.moon.server.entity.all.SettingData;
import com.moon.server.entity.all.StaticData;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.ServletContext;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.FileInputStream;
import java.io.PrintWriter;
import java.net.URLEncoder;
import java.sql.Timestamp;
import java.util.*;

@SuppressWarnings("ALL")
public class WebHelper {
    private final static String UNKNOWN = "unknown";

    private final static String COMMA = ",";

    private final static Log log = LogFactory.getLog(WebHelper.class);

    public static double round(double val, double size) {
        double power = Math.pow(10.0, size);

        return Math.round(val * power) / power;
    }

    public static String getGuid() {
        return UUID.randomUUID().toString();
    }

    public static String getIpAddress(HttpServletRequest request) {
        String ip = request.getHeader("X-Forwarded-For");
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_CLUSTER_CLIENT_IP");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_CLIENT_IP");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_FORWARDED_FOR");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_FORWARDED");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_VIA");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("REMOTE_ADDR");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        if (ip.contains(COMMA)) {
            return ip.split(",")[0];
        }

        return ip;
    }

    public static Timestamp getCurrentTimestamp() {
        return new Timestamp(System.currentTimeMillis());
    }

    public static Timestamp getTimestamp(int min) {
        Calendar now = Calendar.getInstance();
        now.add(Calendar.MINUTE, min);

        return new Timestamp(now.getTimeInMillis());
    }

    public static String getTokenFromCookie(HttpServletRequest request) {
        Cookie[] cookies = request.getCookies();
        if (cookies == null || cookies.length == 0) {
            return null;
        }

        for (Cookie cookie : cookies) {
            switch (cookie.getName()) {
                case StaticData.TOKEN_COOKIE_KEY:
                    return cookie.getValue();
                default:
                    break;
            }
        }

        return null;
    }

    public static void saveToken2Cookie(String token, HttpServletRequest request, HttpServletResponse response) {
        deleteCookies(request, response);

        saveCookie(StaticData.TOKEN_COOKIE_KEY, token, response);
    }

    public static void saveCookie(String key, String value, HttpServletResponse response) {
        Cookie cookie = new Cookie(key, value);
        cookie.setMaxAge(SettingData.COOKIE_MAX_AGE);
        cookie.setHttpOnly(false);
        cookie.setPath("/");
        //cookie.setDomain("*")

        response.setHeader("P3P", "CP=CAO PSA OUR");
        response.addCookie(cookie);
    }

    public static void deleteCookie(String cookieKey, HttpServletRequest request, HttpServletResponse response) {
        Cookie[] cookies = request.getCookies();
        if (cookies != null && cookies.length > 0) {
            for (Cookie c : cookies) {
                if (cookieKey.equalsIgnoreCase(c.getName())) {
                    c.setMaxAge(0);
                    c.setPath("/");
                    response.addCookie(c);
                }
            }
        }
    }

    public static void deleteCookies(HttpServletRequest request, HttpServletResponse response) {
        Cookie[] cookies = request.getCookies();
        if (cookies != null && cookies.length > 0) {
            for (Cookie c : cookies) {
                c.setMaxAge(0);
                c.setPath("/");
                response.addCookie(c);
            }
        }
    }

    public static String getCookieByKey(String key, HttpServletRequest request) {
        Cookie[] cookies = request.getCookies();
        if (cookies == null || cookies.length == 0) {
            return null;
        }

        for (Cookie c : cookies) {
            if (key.equals(c.getName())) {
                return c.getValue();
            }
        }

        return null;
    }

    public static String getToken(HttpServletRequest request) {
        String token = request.getParameter(StaticData.TOKEN_KEY);

        if (token == null) {
            token = request.getHeader(StaticData.TOKEN_KEY);
        }

        if (token == null) {
            token = getTokenFromCookie(request);
        }

        return token;
    }

    public static HttpServletRequest getRequest() {
        ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();

        return servletRequestAttributes.getRequest();
    }

    public static HttpServletResponse getResponse() {
        ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();

        return servletRequestAttributes.getResponse();
    }

    public static HttpSession getSession() {
        return getRequest().getSession();
    }

    public static String getRealPath(String path) {
        HttpServletRequest req = getRequest();
        ServletContext ctx = req.getSession().getServletContext();

        return ctx.getRealPath("/" + path);
    }

    public static boolean writeStr2Page(HttpServletResponse res, String str) {
        try {
            res.setContentType("application/json;charset=UTF-8");
            res.setHeader("Cache-Control", "no-cache");
            res.setHeader("Pragma", "No-cache");
            res.setDateHeader("Expires", 0);

            PrintWriter out = res.getWriter();
            out.print(str);

            out.flush();
            out.close();
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
        }

        return false;
    }

    public static void writeJson2Page(HttpServletResponse res, String str) {
        String json = JSON.toJSONString(new ResponseMsg<>(HttpStatus.ERROR, str));
        writeStr2Page(res, json);
    }

    public static String getErrJson(HttpStatus status, String msg) {
        return JSON.toJSONString(new ResponseMsg<String>(status, msg));
    }

    public static void writeInfo(HttpStatus status, String info, HttpServletResponse res) {
        WebHelper.writeStr2Page(res, WebHelper.getErrJson(status, info));
    }

    public static int getRandomInt(int min, int max) {
        return new Random().nextInt(max) % (max - min + 1) + min;
    }

    public static void download(String file, String fileName, HttpServletResponse res) throws Exception {
        download(file, fileName, false, res);
    }

    public static void download(String file, String fileName, boolean inline, HttpServletResponse res) throws Exception {
        if (StringHelper.isEmpty(fileName)) {
            fileName = StringHelper.YMDHMS2_FORMAT.format(new Date());
        }
        fileName = URLEncoder.encode(fileName, "UTF-8").replace("+", "%20");
        String dispose = inline ? "inline" : "attachment";

        res.setHeader("Content-Disposition", dispose + "; filename*=UTF-8''" + fileName);
        res.setCharacterEncoding("UTF-8");

        String ext = FileHelper.getExtension(file);
        String mime = FileHelper.getMime(ext);
        res.setContentType(mime);

        ServletOutputStream outputStream = res.getOutputStream();
        FileInputStream fileInputStream = new FileInputStream(file);

        int len = 0;
        byte[] bytes = new byte[1024];
        while ((len = fileInputStream.read(bytes)) != -1) {
            outputStream.write(bytes, 0, len);
            outputStream.flush();
        }

        fileInputStream.close();
        outputStream.close();
    }

    public static void exec(String cmd) {
        try {
            Process process = Runtime.getRuntime().exec(cmd);
            process.waitFor();
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
        }
    }

    public static String getReqParamVal(HttpServletRequest req, String key) {
        Map<String, String[]> maps = req.getParameterMap();
        for (Map.Entry<String, String[]> entry : maps.entrySet()) {
            if (entry.getKey().equalsIgnoreCase(key)) {
                return null == entry.getValue() || 0 == entry.getValue().length ? null : entry.getValue()[0];
            }
        }

        return null;
    }

    public static String[] getReqParamVals(HttpServletRequest req, String key) {
        Map<String, String[]> maps = req.getParameterMap();
        for (Map.Entry<String, String[]> entry : maps.entrySet()) {
            if (entry.getKey().equalsIgnoreCase(key)) {
                return entry.getValue();
            }
        }

        return null;
    }
}