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package io.github.wujun728.file.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.io.FilenameUtils;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartFile;

public class FileUtils {

    /**
     * 判断文件是否存在，不存在就创建
     * @param file
     */
    public static void createFile(File file) {
        if (file.exists()) {
            System.out.println("File exists");
        } else {
            System.out.println("File not exists, create it ...");
            //getParentFile() 获取上级目录（包含文件名时无法直接创建目录的）
            if (!file.getParentFile().exists()) {
                System.out.println("not exists");
                //创建上级目录
                file.getParentFile().mkdirs();
            }
            try {
                //在上级目录里创建文件
                file.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
	
	//file 转换为 MultipartFile
    private  MultipartFile getMulFileByFile(File file)
    {
        FileItemFactory factory = new DiskFileItemFactory(16, null);
        String textFieldName = "textField";
        int num = file.getAbsolutePath().lastIndexOf(".");
        String extFile =FilenameUtils.getExtension(file.getAbsolutePath());// filePath.substring(num);
        FileItem item = factory.createItem(textFieldName, "text/plain", true,
                "MyFileName" + extFile);
        File newfile = file;
        int bytesRead = 0;
        byte[] buffer = new byte[8192];
        try
        {
            FileInputStream fis = new FileInputStream(newfile);
            OutputStream os = item.getOutputStream();
            while ((bytesRead = fis.read(buffer, 0, 8192))
                    != -1)
            {
                os.write(buffer, 0, bytesRead);
            }
            os.close();
            fis.close();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        MultipartFile mfile = new CommonsMultipartFile(item);
        return mfile;
 
    }
	
	//file 转换为 MultipartFile
    private  MultipartFile getMulFileByPath(String filePath)
    {
        FileItemFactory factory = new DiskFileItemFactory(16, null);
        String textFieldName = "textField";
        int num = filePath.lastIndexOf(".");
        String extFile = filePath.substring(num);
        FileItem item = factory.createItem(textFieldName, "text/plain", true,
                "MyFileName" + extFile);
        File newfile = new File(filePath);
        int bytesRead = 0;
        byte[] buffer = new byte[8192];
        try
        {
            FileInputStream fis = new FileInputStream(newfile);
            OutputStream os = item.getOutputStream();
            while ((bytesRead = fis.read(buffer, 0, 8192))
                    != -1)
            {
                os.write(buffer, 0, bytesRead);
            }
            os.close();
            fis.close();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
 
        MultipartFile mfile = new CommonsMultipartFile(item);
        return mfile;
 
    }


    /**
     * MultipartFile 转换成File
     *
     * @param multfile 原文件类型
     * @return File
     * @throws IOException
     */
    public static File multipartToFile(MultipartFile multfile) {

        CommonsMultipartFile cf = (CommonsMultipartFile)multfile;
        //这个myfile是MultipartFile的
        DiskFileItem fi = (DiskFileItem) cf.getFileItem();
        File file = fi.getStoreLocation();
        return file;
    }
}