package api.util.helper;

import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;

/**
 * @author Administrator
 */
@Component
public class FileUploadHelper {
    /**
     * 根据文件路径上传
     * @param baseDir 相对应用的基目录
     * @param file 上传的文件
     * @return 文件名称
     * @throws IOException
     */
    public static String upload(String baseDir, MultipartFile file) throws IOException
    {
        try
        {
            int fileNamelength = Objects.requireNonNull(file.getOriginalFilename()).length();
            if (fileNamelength > 50)
            {
                throw new IOException("文件名不能超过50");
            }
            long size = file.getSize();
            if (size > 50 * 1024 * 1024)
            {
                throw new IOException("文件大小不能超过50mb");
            }
            List<String> exts= Arrays.asList(
                    // 图片
                    "bmp", "gif", "jpg", "jpeg", "png",
                    // word excel powerpoint
                    "doc", "docx", "xls", "xlsx", "ppt", "pptx", "html", "htm", "txt",
                    // 压缩文件
                    "rar", "zip", "gz", "bz2",
                    // 视频格式
                    "mp4", "avi", "rmvb",
                    // pdf
                    "pdf" );
            String fileName = file.getOriginalFilename();
            String extension = fileName.substring(fileName.lastIndexOf(".") + 1);
            if (!exts.contains(extension)){
                throw new IOException("此类文件不能上传");
            }
            String newFileName = System.currentTimeMillis()+"."+extension;
            String filePath=baseDir + "/" + newFileName;
            File desc = new File(filePath);
            if (!desc.exists())
            {
                if (!desc.getParentFile().exists())
                {
                    desc.getParentFile().mkdirs();
                }
            }
            String absPath = desc.getAbsolutePath();
            file.transferTo(Paths.get(absPath));

            return filePath;
        }
        catch (Exception e)
        {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 根据文件路径上传
     * @param baseDir 相对应用的基目录
     * @param file 上传的文件
     * @return 文件名称
     * @throws IOException
     */
    public static String uploadImage(String baseDir, MultipartFile file) throws IOException {
        try {
            if (file.isEmpty()) {
                throw new IOException("无文件");
            }
            int fileNamelength = Objects.requireNonNull(file.getOriginalFilename()).length();
            if (fileNamelength > 50) {
                throw new IOException("文件名不能超过50");
            }
            long size = file.getSize();
            if (size > 20 * 1024 * 1024) {
                throw new IOException("文件大小不能超过20mb");
            }
            List<String> exts = Arrays.asList("bmp", "gif", "jpg", "jpeg", "png");
            String fileName = file.getOriginalFilename();
            String extension = fileName.substring(fileName.lastIndexOf(".") + 1);
            if (!exts.contains(extension)) {
                throw new IOException("此类文件不能上传");
            }
            String newFileName = System.currentTimeMillis() + "." + extension;
            String filePath = baseDir + "/" + newFileName;
            File desc = new File(filePath);
            if (!desc.exists()) {
                if (!desc.getParentFile().exists()) {
                    desc.getParentFile().mkdirs();
                }
            }
            String absPath = desc.getAbsolutePath();
            file.transferTo(Paths.get(absPath));

            return filePath;
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }
}