package com.bcxin.auth.common.utils.file;

import com.bcxin.auth.common.utils.DateUtils;
import com.bcxin.auth.common.utils.StringUtils;
import com.github.pagehelper.util.StringUtil;
import com.google.common.collect.Lists;
import com.google.common.io.Files;
import org.apache.commons.lang3.ArrayUtils;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * 文件处理工具类
 * 
 * @author bcxin
 */
public class FileUtils extends org.apache.commons.io.FileUtils
{
    public static String FILENAME_PATTERN = "[a-zA-Z0-9_\\-\\|\\.\\u4e00-\\u9fa5]+";

    /**
     * 输出指定文件的byte数组
     * 
     * @param filePath 文件路径
     * @param os 输出流
     * @return
     */
    public static void writeBytes(String filePath, OutputStream os) throws IOException
    {
        FileInputStream fis = null;
        try
        {
            File file = new File(filePath);
            if (!file.exists())
            {
                throw new FileNotFoundException(filePath);
            }
            fis = new FileInputStream(file);
            byte[] b = new byte[1024];
            int length;
            while ((length = fis.read(b)) > 0)
            {
                os.write(b, 0, length);
            }
        }
        catch (IOException e)
        {
            throw e;
        }
        finally
        {
            if (os != null)
            {
                try
                {
                    os.close();
                }
                catch (IOException e1)
                {
                    e1.printStackTrace();
                }
            }
            if (fis != null)
            {
                try
                {
                    fis.close();
                }
                catch (IOException e1)
                {
                    e1.printStackTrace();
                }
            }
        }
    }

    /**
     * 删除文件
     * 
     * @param filePath 文件
     * @return
     */
    public static boolean deleteFile(String filePath)
    {
        boolean flag = false;
        File file = new File(filePath);
        // 路径为文件且不为空则进行删除
        if (file.isFile() && file.exists())
        {
            file.delete();
            flag = true;
        }
        return flag;
    }

    /**
     * 文件名称验证
     * 
     * @param filename 文件名称
     * @return true 正常 false 非法
     */
    public static boolean isValidFilename(String filename)
    {
        return filename.matches(FILENAME_PATTERN);
    }

    /**
     * 检查文件是否可下载
     * 
     * @param resource 需要下载的文件
     * @return true 正常 false 非法
     */
    public static boolean checkAllowDownload(String resource)
    {
        // 禁止目录上跳级别
        if (StringUtils.contains(resource, ".."))
        {
            return false;
        }

        // 检查允许下载的文件规则
        if (ArrayUtils.contains(MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION, FileTypeUtils.getFileType(resource)))
        {
            return true;
        }

        // 不在允许下载的文件规则
        return false;
    }

    /**
     * 下载文件名重新编码
     * 
     * @param request 请求对象
     * @param fileName 文件名
     * @return 编码后的文件名
     */
    public static String setFileDownloadHeader(HttpServletRequest request, String fileName) throws UnsupportedEncodingException
    {
        final String agent = request.getHeader("USER-AGENT");
        String filename = fileName;
        if (agent.contains("MSIE"))
        {
            // IE浏览器
            filename = URLEncoder.encode(filename, "utf-8");
            filename = filename.replace("+", " ");
        }
        else if (agent.contains("Firefox"))
        {
            // 火狐浏览器
            filename = new String(fileName.getBytes(), "ISO8859-1");
        }
        else if (agent.contains("Chrome"))
        {
            // google浏览器
            filename = URLEncoder.encode(filename, "utf-8");
        }
        else
        {
            // 其它浏览器
            filename = URLEncoder.encode(filename, "utf-8");
        }
        return filename;
    }

    /**
     * 下载文件名重新编码
     *
     * @param response 响应对象
     * @param realFileName 真实文件名
     * @return
     */
    public static void setAttachmentResponseHeader(HttpServletResponse response, String realFileName) throws UnsupportedEncodingException
    {
        String percentEncodedFileName = percentEncode(realFileName);

        StringBuilder contentDispositionValue = new StringBuilder();
        contentDispositionValue.append("attachment; filename=")
                .append(percentEncodedFileName)
                .append(";")
                .append("filename*=")
                .append("utf-8''")
                .append(percentEncodedFileName);

        response.setHeader("Content-disposition", contentDispositionValue.toString());
    }

    /**
     * 百分号编码工具方法
     *
     * @param s 需要百分号编码的字符串
     * @return 百分号编码后的字符串
     */
    public static String percentEncode(String s) throws UnsupportedEncodingException
    {
        String encode = URLEncoder.encode(s, StandardCharsets.UTF_8.toString());
        return encode.replaceAll("\\+", "%20");
    }

    public static String writeTxtFile(String readStr, String fileName, String tempFolder) {
        try {
            String basePath = tempFolder;    //路径
            String filePath = basePath + DateUtils.getDate() + File.separator;//保存路径

            String fileType = ".data";
            File file = new File(filePath);
            if (!file.exists()) {
                file.mkdirs();
                System.out.println("文件夹已创建");
            }
            String fullFilePath = filePath + fileName + fileType;
            //文件处理：写入文件
            File newFile = new File(fullFilePath);
            Files.write(readStr.getBytes(), newFile);
            return fullFilePath;
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

    public static String writeFile(String readStr, String fileName, String filePath) {
        try {

            File file = new File(filePath);
            if (!file.exists()) {
                file.mkdirs();
                System.out.println("文件夹已创建");
            }
            String fullFilePath = filePath + fileName;
            //文件处理：写入文件
            File newFile = new File(fullFilePath);
            Files.write(readStr.getBytes(), newFile);
            return fullFilePath;
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

    /***
     * zip压缩方法
     * @param filePaths
     * @param strZipPath
     * @return
     */
    public static String zipFiles(List<String> filePaths, String strZipPath) {
        byte[] buffer = new byte[1024];
        try {
            ZipOutputStream out = new ZipOutputStream(new FileOutputStream(strZipPath));
            List<File> files = Lists.newArrayList();
            for (String filePath : filePaths) {
                if (StringUtil.isNotEmpty(filePath)) {
                    File file = new File(filePath);
                    if (file.exists()) {
                        files.add(file);
                    }
                }
            }

            for (File file : files) {
                FileInputStream fis = new FileInputStream(file);
                out.putNextEntry(new ZipEntry(file.getName()));
                int len;
                // 读入需要下载的文件的内容，打包到zip文件
                while ((len = fis.read(buffer)) > 0) {
                    out.write(buffer, 0, len);
                }
                out.closeEntry();
                fis.close();
            }
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return strZipPath;
    }

    /***
     * zip压缩方法
     * @param filePath
     * @param strZipPath
     * @return
     */
    public static String zipFile(String filePath, String strZipPath) {
        byte[] buffer = new byte[1024];
        try {
            ZipOutputStream out = new ZipOutputStream(new FileOutputStream(strZipPath));
            File file = new File(filePath);
            FileInputStream fis = new FileInputStream(file);
            out.putNextEntry(new ZipEntry(file.getName()));
            int len;
            // 读入需要下载的文件的内容，打包到zip文件
            while ((len = fis.read(buffer)) > 0) {
                out.write(buffer, 0, len);
            }
            out.closeEntry();
            fis.close();
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return strZipPath;
    }
}
