package com.hx.util;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.io.IOUtils;
import org.springframework.http.MediaType;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import sun.misc.BASE64Decoder;

import java.io.*;
import java.net.URL;
import java.net.URLConnection;
import java.util.Base64;

/**
 * 文件转换工具类
 * @USER: fhx
 * @DATE: 2022/3/2
 **/
public class FileConvertTool {

    private static final int  BUFFER_SIZE = 2 * 1024;


    /** 获取网络路径文件流 */
    public static InputStream getUrlFile(String urlPath) throws IOException {
        if(StringUtils.isEmpty(urlPath)){
            return null;
        }
        // 构造URL
        URL url = new URL(urlPath);
        // 打开连接
        URLConnection con = url.openConnection();
        //设置请求超时为5s
        con.setConnectTimeout(5*1000);
        // 输入流
        InputStream is = con.getInputStream();
        return is;
    }

    /**
     * 获取文件base64字符串
     * @param urlPath  文件路径
     * @return
     * @throws IOException
     */
    public static String getFileBaseStrByUrl(String urlPath) throws IOException {
        InputStream is = getUrlFile(urlPath);
        byte[] bytes = IOUtils.toByteArray(is);
        String encoded = Base64.getEncoder().encodeToString(bytes);
        return encoded;
    }

    // inputStream转outputStream
    public static ByteArrayOutputStream parse(final InputStream in) throws Exception {
        final ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
        int ch;
        while ((ch = in.read()) != -1) {
            swapStream.write(ch);
        }
        return swapStream;
    }

    // outputStream转inputStream
    public static ByteArrayInputStream parse(final OutputStream out) throws Exception {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        baos = (ByteArrayOutputStream) out;
        final ByteArrayInputStream swapStream = new ByteArrayInputStream(baos.toByteArray());
        return swapStream;
    }

    // inputStream转String
    public static String parse_String(final InputStream in) throws Exception {
        final ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
        int ch;
        while ((ch = in.read()) != -1) {
            swapStream.write(ch);
        }
        return swapStream.toString();
    }

    // OutputStream 转String
    public static String parse_String(final OutputStream out) throws Exception {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        baos = (ByteArrayOutputStream) out;
        final ByteArrayInputStream swapStream = new ByteArrayInputStream(baos.toByteArray());
        return swapStream.toString();
    }

    // String转inputStream
    public static ByteArrayInputStream parse_inputStream(final String in) throws Exception {
        final ByteArrayInputStream input = new ByteArrayInputStream(in.getBytes());
        return input;
    }

    // String 转outputStream
    public static ByteArrayOutputStream parse_outputStream(final String in) throws Exception {
        return parse(parse_inputStream(in));
    }

    /**
     * 根据byte数组，生成文件
     */
    public static File getFile(byte[] bfile, String filePath,String fileName) {
        BufferedOutputStream bos = null;
        FileOutputStream fos = null;
        File file = null;
        try {
            File dir = new File(filePath);
            if(!dir.exists()&&dir.isDirectory()){//判断文件目录是否存在
                dir.mkdirs();
            }
            file = new File(filePath+"\\"+fileName);
            fos = new FileOutputStream(file);
            bos = new BufferedOutputStream(fos);
            bos.write(bfile);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (bos != null) {
                try {
                    bos.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        }
        return file;
    }

    /**
     * 根据byte数组，生成文件
     */
    public static File getFile(InputStream in, String filePath, String fileName) {
        if(in == null){
            return null;
        }
        BufferedOutputStream bos = null;
        FileOutputStream fos = null;
        File file = null;
        try {
            File dir = new File(filePath);
            //判断文件目录是否存在
            if(!dir.exists()){
                dir.mkdirs();
            }
            file = new File(filePath+"/"+fileName);
            fos = new FileOutputStream(file);
            byte[] b = new byte[BUFFER_SIZE];
//            while ((in.read(b)) != -1) {
//                fos.write(b); // 写入数据
//            }
            int len;
            while ((len = in.read(b)) != -1){
                fos.write(b, 0, len);
            }
            in.close();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (bos != null) {
                try {
                    bos.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        }
        return file;
    }

    /**
     * 获得指定文件的byte数组
     */
    private static byte[] getBytes(String filePath){
        byte[] buffer = null;
        try {
            File file = new File(filePath);
            FileInputStream fis = new FileInputStream(file);
            ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);
            byte[] b = new byte[1000];
            int n;
            while ((n = fis.read(b)) != -1) {
                bos.write(b, 0, n);
            }
            fis.close();
            bos.close();
            buffer = bos.toByteArray();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return buffer;
    }

    public static MultipartFile getMultipartFile(File file) {
        FileItem item = new DiskFileItemFactory().createItem("file"
                , MediaType.MULTIPART_FORM_DATA_VALUE
                , true
                , file.getName());
        try (InputStream input = new FileInputStream(file);
             OutputStream os = item.getOutputStream()) {
            // 流转移
            IOUtils.copy(input, os);
        } catch (Exception e) {
            throw new IllegalArgumentException("Invalid file: " + e, e);
        }

        return new CommonsMultipartFile(item);
    }

    /**
     *  根据路径删除指定的目录或文件，无论存在与否
     *@param sPath  要删除的目录或文件
     *@return 删除成功返回 true，否则返回 false。
     */
    public static boolean deleteFolder(String sPath) {
        File file = new File(sPath);
        // 判断目录或文件是否存在
        if (!file.exists()) {
            // 不存在返回 true
            return true;
        } else {
            // 判断是否为文件
            if (file.isFile()) {  // 为文件时调用删除文件方法
                return deleteFile(sPath);
            } else {  // 为目录时调用删除目录方法
                return deleteDirectory(sPath);
            }
        }
    }

    /**
     * 删除单个文件
     * @param   sPath    被删除文件的文件名
     * @return 单个文件删除成功返回true，否则返回false
     */
    public static boolean deleteFile(String sPath) {
        File  file = new File(sPath);
        // 路径为文件且不为空则进行删除
        if (file.isFile() && file.exists()) {
            file.delete();
            return true;
        }
        return false;
    }

    /**
     * 删除目录（文件夹）以及目录下的文件
     * @param   sPath 被删除目录的文件路径
     * @return  目录删除成功返回true，否则返回false
     */
    public static boolean deleteDirectory(String sPath) {
        //如果sPath不以文件分隔符结尾，自动添加文件分隔符
        if (!sPath.endsWith(File.separator)) {
            sPath = sPath + File.separator;
        }
        File dirFile = new File(sPath);
        //如果dir对应的文件不存在，或者不是一个目录，则退出
        if (!dirFile.exists() || !dirFile.isDirectory()) {
            return false;
        }
        boolean flag = true;
        //删除文件夹下的所有文件(包括子目录)
        File[] files = dirFile.listFiles();
        for (int i = 0; i < files.length; i++) {
            //删除子文件
            if (files[i].isFile()) {
                flag = deleteFile(files[i].getAbsolutePath());
                if (!flag) break;
            } //删除子目录
            else {
                flag = deleteDirectory(files[i].getAbsolutePath());
                if (!flag) break;
            }
        }
        if (!flag) return false;
        //删除当前目录
        if (dirFile.delete()) {
            return true;
        } else {
            return false;
        }
    }


}