package com.gkhy.exam.system.service.impl;

import cn.hutool.core.date.DateUtil;
import com.gkhy.exam.common.exception.ApiException;
import com.gkhy.exam.system.domain.vo.UploadObjectVO;
import com.gkhy.exam.system.service.SysCommonService;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;
import sun.misc.BASE64Decoder;

import java.io.*;
import java.util.Date;
import java.util.UUID;

@Service
public class SysCommonServiceImpl implements SysCommonService {

    @Value("${image.upload_image}")
    private String uploadPath;

    @Override
    public UploadObjectVO uploadFile(MultipartFile file) {
        if(file==null){
            throw new ApiException("上传文件不能为空");
        }
        UploadObjectVO uploadObjectVO=doUpload(file);
        return uploadObjectVO;
    }

    @Override
    public boolean removeFile(String path) {
        String systemDir=System.getProperty("user.dir");
        String filePath=systemDir+File.separator+path;
        File dirFile=new File(filePath);
        if(!dirFile.exists()){
            throw new ApiException("文件不存在");
        }
        if(!dirFile.isFile()){
            throw new ApiException("非文件，不能删除");
        }
        dirFile.delete();
        return true;
    }

    @Override
    public UploadObjectVO doUpload(MultipartFile file){
        String originName=file.getOriginalFilename();
        String filename=originName;
        String subfix=filename.substring(filename.lastIndexOf("."));
        Long size=file.getSize();
        filename= UUID.randomUUID().toString().replace("-","")+subfix;
        String systemDir=System.getProperty("user.dir");
        String dateStr= DateUtil.format(new Date(),"yyyyMMdd");
        String filePath=uploadPath+File.separator+dateStr;
        File dirFile=new File(filePath);
        if(!dirFile.exists()){
            dirFile.mkdirs();
        }
        filePath=filePath+File.separator+filename;
        try {
            file.transferTo(new File(systemDir+File.separator+filePath));
        } catch (FileNotFoundException e) {
            throw new ApiException("找不到文件");
        } catch (IOException e) {
            throw new ApiException("发生错误,请联系管理员");
        }
        filePath=filePath.replace("\\","/");
        UploadObjectVO uploadObjectVO=new UploadObjectVO().setFilename(filename)
                .setPath(filePath).setOriginName(originName).setSize(size);
        return uploadObjectVO;
    }

    @Override
    public UploadObjectVO doUpload(String imageBase64) {
        String originName="";
        String filename=originName;
        String subfix=".png";
        filename= UUID.randomUUID().toString().replace("-","")+subfix;
        String systemDir=System.getProperty("user.dir");
        String dateStr= DateUtil.format(new Date(),"yyyyMMdd");
        String filePath=uploadPath+File.separator+dateStr;
        File dirFile=new File(filePath);
        if(!dirFile.exists()){
            dirFile.mkdirs();
        }
        filePath=filePath+File.separator+filename;
        BASE64Decoder decoder = new BASE64Decoder();
        try {
            // Base64解码
            byte[] bytes = decoder.decodeBuffer(imageBase64);
            for (int i = 0; i < bytes.length; ++i) {
                if (bytes[i] < 0) {// 调整异常数据
                    bytes[i] += 256;
                }
            }
            // 生成jpeg图片
            OutputStream out = new FileOutputStream(systemDir+File.separator+filePath);
            out.write(bytes);
            out.flush();
            out.close();
        } catch (FileNotFoundException e) {
            throw new ApiException("找不到文件");
        } catch (IOException e) {
            throw new ApiException("发生错误,请联系管理员");
        }
        filePath=filePath.replace("\\","/");
        UploadObjectVO uploadObjectVO=new UploadObjectVO().setFilename(filename)
                .setPath(filePath).setOriginName(originName);
        return uploadObjectVO;
    }

}