/*
 *  Copyright 2019-2020 Zheng Jie
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.cirle.scientific.utils;

import cn.hutool.core.io.IoUtil;
import cn.hutool.core.util.IdUtil;
import cn.hutool.poi.excel.BigExcelWriter;
import cn.hutool.poi.excel.ExcelUtil;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.ClientAnchor;
import org.apache.poi.ss.usermodel.Drawing;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.util.IOUtils;
import org.apache.poi.xssf.streaming.SXSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.MessageDigest;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Map;

/**
 * File工具类，扩展 hutool 工具包
 *
 * @author Zheng Jie
 * @date 2018-12-27
 */
public class FileUtil extends cn.hutool.core.io.FileUtil {

    private static final Logger log = LoggerFactory.getLogger(FileUtil.class);

    /**
     * 系统临时目录
     * <br>
     * windows 包含路径分割符，但Linux 不包含,
     * 在windows \\==\ 前提下，
     * 为安全起见 同意拼装 路径分割符，
     * <pre>
     *       java.io.tmpdir
     *       windows : C:\Users/xxx\AppData\Local\Temp\
     *       linux: /temp
     * </pre>
     */
    public static final String SYS_TEM_DIR = System.getProperty("java.io.tmpdir") + File.separator;
    /**
     * 定义GB的计算常量
     */
    private static final int GB = 1024 * 1024 * 1024;
    /**
     * 定义MB的计算常量
     */
    private static final int MB = 1024 * 1024;
    /**
     * 定义KB的计算常量
     */
    private static final int KB = 1024;

    /**
     * 格式化小数
     */
    private static final DecimalFormat DF = new DecimalFormat("0.00");

    public static final String IMAGE = "图片";
    public static final String TXT = "文档";
    public static final String MUSIC = "音乐";
    public static final String VIDEO = "视频";
    public static final String OTHER = "其他";

    public static String[] chars = new String[]{"a", "b", "c", "d", "e", "f",
            "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s",
            "t", "u", "v", "w", "x", "y", "z", "0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I",
            "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V",
            "W", "X", "Y", "Z"};


    /**
     * MultipartFile转File
     */
    public static File toFile(MultipartFile multipartFile) {
        // 获取文件名
        String fileName = multipartFile.getOriginalFilename();
        // 获取文件后缀
        String prefix = "." + getExtensionName(fileName);
        File file = null;
        try {
            // 用uuid作为文件名，防止生成的临时文件重复
            file = new File(SYS_TEM_DIR + IdUtil.simpleUUID() + prefix);
            // MultipartFile to File
            multipartFile.transferTo(file);
        } catch (IOException e) {
            log.error(e.getMessage(), e);
        }
        return file;
    }

    /**
     * 获取文件扩展名，不带 .
     */
    public static String getExtensionName(String filename) {
        if ((filename != null) && (filename.length() > 0)) {
            int dot = filename.lastIndexOf('.');
            if ((dot > -1) && (dot < (filename.length() - 1))) {
                return filename.substring(dot + 1);
            }
        }
        return filename;
    }

    /**
     * Java文件操作 获取不带扩展名的文件名
     */
    public static String getFileNameNoEx(String filename) {
        if ((filename != null) && (filename.length() > 0)) {
            int dot = filename.lastIndexOf('.');
            if ((dot > -1) && (dot < (filename.length()))) {
                String substring = filename.substring(0, dot);
                return PYUtil.getFirstSpell(substring);
            }
        }
        return filename;
    }

    /**
     * Java文件操作 获取不带扩展名的文件名
     */
    public static String getFileName(String filename) {
        if ((filename != null) && (filename.length() > 0)) {
            int dot = filename.lastIndexOf('/');
            if ((dot > -1) && (dot < (filename.length()))) {
                String substring = filename.substring(dot + 1);
                return PYUtil.getFirstSpell(substring);
            }
        }
        return filename;
    }

    /**
     * 文件大小转换
     */
    public static String getSize(long size) {
        String resultSize;
        if (size / GB >= 1) {
            //如果当前Byte的值大于等于1GB
            resultSize = DF.format(size / (float) GB) + "GB   ";
        } else if (size / MB >= 1) {
            //如果当前Byte的值大于等于1MB
            resultSize = DF.format(size / (float) MB) + "MB   ";
        } else if (size / KB >= 1) {
            //如果当前Byte的值大于等于1KB
            resultSize = DF.format(size / (float) KB) + "KB   ";
        } else {
            resultSize = size + "B   ";
        }
        return resultSize;
    }

    /**
     * inputStream 转 File
     */
    static File inputStreamToFile(InputStream ins, String name) {
        File file = new File(SYS_TEM_DIR + name);
        if (file.exists()) {
            return file;
        }
        OutputStream os = null;
        try {
            os = new FileOutputStream(file);
            int bytesRead;
            int len = 8192;
            byte[] buffer = new byte[len];
            while ((bytesRead = ins.read(buffer, 0, len)) != -1) {
                os.write(buffer, 0, bytesRead);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            CloseUtil.close(os);
            CloseUtil.close(ins);
        }
        return file;
    }

    /**
     * 将文件名解析成文件的上传路径
     */
    public static File upload(MultipartFile file, String filePath) {
        Date date = new Date();
        SimpleDateFormat format = new SimpleDateFormat("yyyyMMddhhmmssS");
        String name = getFileNameNoEx(file.getOriginalFilename());
        String suffix = getExtensionName(file.getOriginalFilename());
        String nowStr = "-" + format.format(date);
        try {
            String fileName = name + nowStr + "." + suffix;
            String path = filePath + fileName;
            // getCanonicalFile 可解析正确各种路径
            File dest = new File(path).getCanonicalFile();
            // 检测是否存在目录
            if (!dest.getParentFile().exists()) {
                if (!dest.getParentFile().mkdirs()) {
                    System.out.println("was not successful.");
                }
            }
            // 文件写入
            file.transferTo(dest);
            return dest;
        } catch (Exception e) {
            log.error(e.getMessage(), e);
        }
        return null;
    }

    /**
     * 导出excel
     */
    public static void downloadExcel(List<Map<String, Object>> list, HttpServletResponse response) throws IOException {
        String tempPath = SYS_TEM_DIR + IdUtil.fastSimpleUUID() + ".xlsx";
        File file = new File(tempPath);
        BigExcelWriter writer = ExcelUtil.getBigWriter(file);
        // 一次性写出内容，使用默认样式，强制输出标题
        writer.write(list, true);
        SXSSFSheet sheet = (SXSSFSheet) writer.getSheet();
        //上面需要强转SXSSFSheet  不然没有trackAllColumnsForAutoSizing方法
        sheet.trackAllColumnsForAutoSizing();
        //列宽自适应
        writer.autoSizeColumnAll();
        //response为HttpServletResponse对象
        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
        //test.xls是弹出下载对话框的文件名，不能为中文，中文请自行编码
        response.setHeader("Content-Disposition", "attachment;filename=file.xlsx");
        ServletOutputStream out = response.getOutputStream();
        // 终止后删除临时文件
        file.deleteOnExit();
        writer.flush(out, true);
        //此处记得关闭输出Servlet流
        IoUtil.close(out);
    }

    /**
     * 导出excel包含图片,图片放到最后一个字段
     */
    public static void exportData(List<Map<String, Object>> list, HttpServletResponse response)throws IOException {
        String tempPath = SYS_TEM_DIR + IdUtil.fastSimpleUUID() + ".xlsx";
        File file = new File(tempPath);
        BigExcelWriter writer = ExcelUtil.getBigWriter(file);
        Workbook workbook = writer.getWorkbook();
        Sheet sheet1 = writer.getSheet();
        Drawing<?> patriarch  = sheet1.createDrawingPatriarch();
        for (int i = 0; i < list.size(); i++) {
            //计算它的纵坐标的数
            Map<String, Object> map = list.get(i);
            //拿到了图片的url
            String pictureUrl  = (String) list.get(i).get("签名的图片");
            if (pictureUrl != null){
                //WriteImgUtil.writeImg（）为自定义写入图片到excel表中的方法，见一下WriteImgUtil工具类。
                writeImg(i+1, map.size()-1, pictureUrl, workbook, patriarch);
                //如果不加此操作的话，该单元格里面虽然写入了图片，但同时也会把list中遍历出的pictureUrl 路径给写到单元格去。
                list.get(i).remove("签名的图片");
                list.get(i).put("签名的图片","");
            }
        }
        // 一次性写出内容，使用默认样式，强制输出标题
        writer.write(list, true);
        SXSSFSheet sheet = (SXSSFSheet) writer.getSheet();
        //上面需要强转SXSSFSheet  不然没有trackAllColumnsForAutoSizing方法
        sheet.trackAllColumnsForAutoSizing();
        //列宽自适应
        writer.autoSizeColumnAll();
        //response为HttpServletResponse对象
        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
        //test.xls是弹出下载对话框的文件名，不能为中文，中文请自行编码
        response.setHeader("Content-Disposition", "attachment;filename=file.xlsx");
        ServletOutputStream out = response.getOutputStream();
        // 终止后删除临时文件
        file.deleteOnExit();
        writer.flush(out, true);
        //此处记得关闭输出Servlet流
        IoUtil.close(out);
    }

    /**
     * 把图片写入excel中
     * @param row 写入的行
     * @param col 写入的列
     * @param pictureUrl 可打开的图片的地址
     * @param workbook 工作簿
     * @param patriarch 绘图对象
     */
    public static void writeImg(Integer row, Integer col, String pictureUrl, Workbook workbook, Drawing<?> patriarch){
        try {
            if (StringUtils.isNotBlank(pictureUrl)) {
                URL url = new URL(pictureUrl);
                //打开链接
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                //设置请求方式为"GET"
                conn.setRequestMethod("GET");
                //超时响应时间为5秒  q
                conn.setConnectTimeout(5 * 1000);
                //通过输入流获取图片数据
                InputStream inStream = conn.getInputStream();
                //得到图片的二进制数据，以二进制封装得到数据，具有通用性
                byte[] data = readInputStream(inStream);
                //anchor主要用于设置图片的属性
                XSSFClientAnchor anchor = new XSSFClientAnchor(0, 0, 1023, 1023, col.shortValue(), row.shortValue(), col.shortValue()+1, row.shortValue()+1);
                anchor.setAnchorType(ClientAnchor.AnchorType.MOVE_AND_RESIZE);
                patriarch.createPicture(anchor, workbook.addPicture(data, XSSFWorkbook.PICTURE_TYPE_JPEG));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 通过输入流获得二进制图片数据
     * @param inStream
     * @return
     * @throws Exception
     */
    private static byte[] readInputStream(InputStream inStream) throws Exception{
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        //创建一个Buffer字符串
        byte[] buffer = new byte[1024];
        //每次读取的字符串长度，如果为-1，代表全部读取完毕
        int len = 0;
        //使用一个输入流从buffer里把数据读取出来
        while( (len=inStream.read(buffer)) != -1 ){
            //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度
            outStream.write(buffer, 0, len);
        }
        //关闭输入流
        inStream.close();
        //把outStream里的数据写入内存
        return outStream.toByteArray();
    }


    public static String getFileType(String type) {
        String documents = "txt doc pdf ppt pps xlsx xls docx";
        String music = "mp3 wav wma mpa ram ra aac aif m4a";
        String video = "avi mpg mpe mpeg asf wmv mov qt rm mp4 flv m4v webm ogv ogg";
        String image = "bmp dib pcp dif wmf gif jpg tif eps psd cdr iff tga pcd mpt png jpeg";
        if (image.contains(type)) {
            return IMAGE;
        } else if (documents.contains(type)) {
            return TXT;
        } else if (music.contains(type)) {
            return MUSIC;
        } else if (video.contains(type)) {
            return VIDEO;
        } else {
            return OTHER;
        }
    }

    public static void checkSize(long maxSize, long size) {
        // 1M
        int len = 1024 * 1024;
        if (size > (maxSize * len)) {
            throw new RuntimeException("文件超出规定大小");
        }
    }

    /**
     * 判断两个文件是否相同
     */
    public static boolean check(File file1, File file2) {
        String img1Md5 = getMd5(file1);
        String img2Md5 = getMd5(file2);
        if (img1Md5 != null) {
            return img1Md5.equals(img2Md5);
        }
        return false;
    }

    /**
     * 判断两个文件是否相同
     */
    public static boolean check(String file1Md5, String file2Md5) {
        return file1Md5.equals(file2Md5);
    }

    private static byte[] getByte(File file) {
        // 得到文件长度
        byte[] b = new byte[(int) file.length()];
        InputStream in = null;
        try {
            in = new FileInputStream(file);
            try {
                System.out.println(in.read(b));
            } catch (IOException e) {
                log.error(e.getMessage(), e);
            }
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            return null;
        } finally {
            CloseUtil.close(in);
        }
        return b;
    }

    private static String getMd5(byte[] bytes) {
        // 16进制字符
        char[] hexDigits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
        try {
            MessageDigest mdTemp = MessageDigest.getInstance("MD5");
            mdTemp.update(bytes);
            byte[] md = mdTemp.digest();
            int j = md.length;
            char[] str = new char[j * 2];
            int k = 0;
            // 移位 输出字符串
            for (byte byte0 : md) {
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
        }
        return null;
    }

    /**
     * 下载文件
     *
     * @param request  /
     * @param response /
     * @param file     /
     */
    public static void downloadFile(HttpServletRequest request, HttpServletResponse response, File file, boolean deleteOnExit) {
        response.setCharacterEncoding(request.getCharacterEncoding());
        response.setContentType("application/octet-stream");
        FileInputStream fis = null;
        try {
            fis = new FileInputStream(file);
            response.setHeader("Content-Disposition", "attachment; filename=" + file.getName());
            IOUtils.copy(fis, response.getOutputStream());
            response.flushBuffer();
        } catch (Exception e) {
            log.error(e.getMessage(), e);
        } finally {
            if (fis != null) {
                try {
                    fis.close();
                    if (deleteOnExit) {
                        file.deleteOnExit();
                    }
                } catch (IOException e) {
                    log.error(e.getMessage(), e);
                }
            }
        }
    }

    public static String getMd5(File file) {
        return getMd5(getByte(file));
    }
}
