package com.se.simu.helper;

import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpStatus;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.InetAddress;
import java.net.URLEncoder;
import java.net.UnknownHostException;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.*;

/**
 * Web帮助类
 *
 * @author WWW
 * @date 2024-07-16
 */
@Slf4j
public class WebHelper {
    public final static String POINT = ".";

    private final static String COMMA = ",";

    private final static String UNKNOWN = "unknown";

    public static boolean isWin() {
        String osName = System.getProperty("os.name");

        return osName.startsWith("Windows");
    }

    /**
     * 格式化日期
     */
    public final static SimpleDateFormat YMDHMS = new SimpleDateFormat("yyyyMMddHHmmss");

    /**
     * 字符串,是否为空null和空格
     */
    public static boolean isEmpty(String str) {
        return null == str || "".equals(str.trim());
    }

    /**
     * 获取GUID
     */
    public static String getGuid() {
        return UUID.randomUUID().toString();
    }

    /**
     * 获取主机IP
     */
    public static String getHostIp() {
        try {
            return InetAddress.getLocalHost().getHostAddress();
        } catch (UnknownHostException e) {
            //
        }
        return "127.0.0.1";
    }

    /**
     * 获取用户IP
     */
    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;
    }

    /**
     * 获取当前时间的Timestamp
     */
    public static Timestamp getCurrentTimestamp() {
        return new Timestamp(System.currentTimeMillis());
    }

    /**
     * 获取Request
     */
    public static HttpServletRequest getRequest() {
        ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();

        return servletRequestAttributes.getRequest();
    }

    /**
     * 获取Response
     */
    public static HttpServletResponse getResponse() {
        ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();

        return servletRequestAttributes.getResponse();
    }

    /**
     * 输出JSON至页面
     */
    public static boolean writeJson2Page(HttpServletResponse res, HttpStatus status, Object obj) {
        res.setStatus(status.value());

        return writeStr2Page(res, JSON.toJSONString(obj));
    }

    /**
     * 输出JSON至页面
     */
    public static boolean writeJson2Page(HttpServletResponse res, HttpStatus status, String str) {
        res.setStatus(status.value());

        Map<String, Object> map = new HashMap(2);
        map.put("code", status.value() >= 400 ? -1 : 0);
        map.put("msg", str);

        return writeStr2Page(res, JSON.toJSONString(map));
    }

    /**
     * 输出str至页面
     */
    public static boolean writeStr2Page(HttpServletResponse res, HttpStatus status, String str) {
        res.setStatus(status.value());

        return writeStr2Page(res, str);
    }

    /**
     * 输出str至页面
     */
    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;
    }

    /**
     * 输出字节数组
     */
    public static void writeBytes(byte[] bytes, HttpServletResponse res) throws IOException {
        res.setContentType("application/octet-stream");

        if (null == bytes) {
            res.setStatus(HttpStatus.NOT_FOUND.value());
            return;
        }

        OutputStream os = res.getOutputStream();
        os.write(bytes, 0, bytes.length);
        os.close();
    }

    /**
     * 输出Png文件
     */
    public static void writePng(String filePath, HttpServletResponse res) throws IOException {
        File file = new File(filePath);
        if (!file.exists() || file.isDirectory()) {
            res.setStatus(HttpStatus.NOT_FOUND.value());
            return;
        }

        String fileName = URLEncoder.encode(filePath, "UTF-8").replace("+", "%20");
        res.setHeader("Content-Disposition", "attachment; filename*=UTF-8''" + fileName);
        res.setCharacterEncoding("UTF-8");
        res.setContentType("image/png");

        writeFile(filePath, res);
    }

    /**
     * 获取随机整数
     */
    public static int getRandomInt(int min, int max) {
        return new Random().nextInt(max) % (max - min + 1) + min;
    }

    /**
     * 下载文件
     */
    public static void download(String file, String fileName, HttpServletResponse res) throws Exception {
        download(file, fileName, false, res);
    }

    /**
     * 下载文件
     *
     * @param file     文件
     * @param fileName 文件名
     * @param res      响应
     * @throws Exception 异常
     */
    public static void download(String file, String fileName, boolean inline, HttpServletResponse res) throws Exception {
        if (isEmpty(fileName)) {
            fileName = YMDHMS.format(new Date());
        }
        fileName = URLEncoder.encode(fileName, "UTF-8").replace("+", "%20");
        String dispose = inline ? "inline" : "attachment";

        // 设置响应头中文件的下载方式为附件方式，以及设置文件名
        res.setHeader("Content-Disposition", dispose + "; filename*=UTF-8''" + fileName);
        // 设置响应头的编码格式为 UTF-8
        res.setCharacterEncoding("UTF-8");

        // 通过response对象设置响应数据格式(如："text/plain; charset=utf-8")
        String ext = getExtension(file);
        String mime = getMime(ext);
        res.setContentType(mime);

        writeFile(file, res);
    }

    /**
     * 写文件
     */
    private static void writeFile(String file, HttpServletResponse res) throws IOException {
        // 通过response对象，获取到输出流
        ServletOutputStream outputStream = res.getOutputStream();
        // 定义输入流，通过输入流读取文件内容
        FileInputStream fileInputStream = new FileInputStream(file);

        int len = 0;
        byte[] bytes = new byte[1024];
        while ((len = fileInputStream.read(bytes)) != -1) {
            // 通过输入流读取文件数据，然后通过上述的输出流写回浏览器
            outputStream.write(bytes, 0, len);
            outputStream.flush();
        }

        // 关闭资源
        fileInputStream.close();
        outputStream.close();
    }

    /**
     * 获取文件扩展名
     */
    public static String getExtension(String fileName) {
        if (isEmpty(fileName)) {
            return "";
        }

        int idx = fileName.lastIndexOf(POINT);
        if (idx == -1) {
            return "";
        }

        return fileName.substring(idx).toLowerCase();
    }

    /**
     * 获取多用途互联网邮件扩展类型
     */
    public static String getMime(String ext) {
        switch (ext) {
            // 图片
            case ".tif":
            case ".tiff":
                return "image/tiff";
            case ".img":
                return "application/x-img";
            case ".gif":
                return "image/gif";
            case ".jpg":
            case ".jpeg":
                return "image/jpeg";
            case ".png":
                return "image/png";
            // 音/视频
            case ".mp3":
                return "audio/mp3";
            case ".mp4":
                return "video/mpeg4";
            case ".avi":
                return "video/avi";
            case ".mpg":
            case ".mpeg":
                return "video/mpg";
            case ".wav":
                return "audio/wav";
            case ".wma":
                return "audio/x-ms-wma";
            case ".swf":
                return "application/x-shockwave-flash";
            case ".wmv":
                return "video/x-ms-wmv";
            case ".rm":
                return "application/vnd.rn-realmedia";
            case ".rmvb":
                return "application/vnd.rn-realmedia-vbr";
            // 网页
            case ".js":
                return "application/x-javascript";
            case ".css":
                return "text/css";
            case ".asp":
                return "text/asp";
            case ".mht":
                return "message/rfc822";
            case ".jsp":
            case ".htm":
            case ".html":
            case ".xhtml":
                return "text/html";
            case ".xml":
            case ".svg":
                return "text/xml";
            // 文件
            case ".txt":
                return "text/plain";
            case ".dbf":
                return "application/x-dbf";
            case ".mdb":
                return "application/msaccess";
            case ".pdf":
                return "application/pdf";
            case ".ppt":
            case ".pptx":
                return "application/x-ppt";
            case ".doc":
            case ".docx":
                return "application/msword";
            case ".xls":
            case ".xlsx":
                return "application/vnd.ms-excel";
            case ".dgn":
                return "application/x-dgn";
            case ".dwg":
                return "application/x-dwg";
            case ".ext":
                return "application/x-msdownload";
            // 默认
            default:
                return "application/octet-stream";
        }
    }
}