package cc.mrbird.febs.server.hr.service.impl;

import java.io.*;
import java.util.*;

import cc.mrbird.febs.common.core.constant.ModuleCode;
import cc.mrbird.febs.common.core.exception.FebsException;
import cc.mrbird.febs.common.core.utils.FebsUtil;
import cc.mrbird.febs.common.core.utils.SequenceUtil;
import cc.mrbird.febs.server.hr.entity.FilesUpload;
import cc.mrbird.febs.server.hr.entity.Folder;
import cc.mrbird.febs.server.hr.mapper.FilesUploadMapper;
import cc.mrbird.febs.server.hr.properties.FebsServerHrProperties;
import cc.mrbird.febs.server.hr.service.IFilesUploadService;
import cn.hutool.core.date.DateUtil;
import cn.hutool.core.io.FileUtil;
import cn.hutool.core.io.file.FileWriter;
import cn.hutool.core.lang.Snowflake;
import cn.hutool.core.util.IdUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.transaction.annotation.Propagation;
import lombok.RequiredArgsConstructor;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import cc.mrbird.febs.common.core.entity.QueryRequest;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * 文件上传 Service实现
 *
 * @author yz
 * @date 2021-02-05 22:51:00
 */
@Service
@RequiredArgsConstructor
@Transactional(propagation = Propagation.SUPPORTS, readOnly = true)
public class FilesUploadServiceImpl extends ServiceImpl<FilesUploadMapper, FilesUpload> implements IFilesUploadService {

    private final FilesUploadMapper filesUploadMapper;
    private final FebsServerHrProperties properties;
    private final String operatorId = Optional.ofNullable(FebsUtil.getCurrentUser())
            .map(u -> u.getUserId().toString())
            .orElse("1");
    /**
     * 参数2为数据中心ID 参数1为终端ID
     */
    private Snowflake snowflake = IdUtil.getSnowflake(ModuleCode.HR_FIlE, 1);

    @Override
    public IPage<FilesUpload> findFilesUploads(QueryRequest request, FilesUpload filesUpload) {
        LambdaQueryWrapper<FilesUpload> queryWrapper = new LambdaQueryWrapper<>();
        Page<FilesUpload> page = new Page<>(request.getPageNum(), request.getPageSize());
        return this.page(page, queryWrapper);
    }

    @Override
    public List<FilesUpload> findFilesUploads(FilesUpload filesUpload) {
        LambdaQueryWrapper<FilesUpload> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(FilesUpload::getDelFlag,0);
        if (null != filesUpload.getFolderid()) {
            queryWrapper.eq(FilesUpload::getFolderid, filesUpload.getFolderid());
        }
        if (StrUtil.isNotBlank(filesUpload.getFilesname())) {
            queryWrapper.like(FilesUpload::getFilesname, filesUpload.getFilesname());
        }
        queryWrapper.orderByDesc(FilesUpload::getModifytime);
        return this.baseMapper.selectList(queryWrapper);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void createFilesUpload(Long folderid, MultipartFile file) throws FebsException, IOException {
        if (file.isEmpty()) {
            throw new FebsException("上传的文件不能为空！请重新上传");
        }
        if (file.getSize() <= 0) {
            throw new FebsException("上传的文件大小需要大于0kb");
        }
        if (file.getSize() > 50 * 1024* 1024) {
            throw new FebsException("上传的文件大于50M");
        }
        if (!FileUtil.exist(properties.getUploadPpath())) {
            FileUtil.mkdir(properties.getUploadPpath());
        }
        //原本名字
        String fileName = file.getOriginalFilename();
        String suffix = "";
        if (fileName.indexOf(".") > 0) {
            //后缀
            suffix = fileName.substring(fileName.indexOf("."), fileName.length());
        }
        //生成新的名字
        String newName = snowflake.nextIdStr() + suffix;
        //上传
        file.transferTo(new File(properties.getUploadPpath() + newName));

        FilesUpload filesUpload = new FilesUpload();
        filesUpload.setCreatetime(new Date());
        filesUpload.setCreator(operatorId);
        filesUpload.setDelFlag(0);
        filesUpload.setFilesaddress(newName);
        filesUpload.setFilesformat(StrUtil.isBlank(suffix) ? suffix : suffix.substring(1));
        filesUpload.setFilesid(SequenceUtil.generateId(0L, ModuleCode.HR_FIlE));
        filesUpload.setFilesname(fileName);
        filesUpload.setFolderid(folderid);
        filesUpload.setModifier(operatorId);
        filesUpload.setModifytime(new Date());
        filesUpload.setVersion(0);
        this.save(filesUpload);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateFilesUpload(FilesUpload filesUpload) {
        this.saveOrUpdate(filesUpload);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void deleteFilesUpload(String fileids) {
        String[] arr = fileids.split(",");
        LambdaUpdateWrapper<FilesUpload> wapper = new LambdaUpdateWrapper<>();
        wapper.in(FilesUpload::getFilesid,arr).setSql("delFlag = 1");
        this.update(wapper);

        LambdaQueryWrapper<FilesUpload> queryWrapper = new LambdaQueryWrapper<>();
        wapper.in(FilesUpload::getFilesid,arr);
        List<FilesUpload> list = this.list(queryWrapper);
        list.parallelStream().forEach(i-> FileUtil.del(properties.getUploadPpath() + i.getFilesaddress()));

    }

    @Override
    public void download(String fileids, HttpServletRequest request, HttpServletResponse response) {
        String[] arr = fileids.split(",");
        List<File> files = new ArrayList<>();
        Arrays.stream(arr).forEach(i -> {
            FilesUpload filesUpload = this.getById(i);
            files.add(new File(properties.getUploadPpath() + filesUpload.getFilesaddress()));
        });
        //设置压缩包的名字
        //解决不同浏览器压缩包名字含有中文时乱码的问题
        String downloadName ="PersonnelInformation-" + DateUtil.format(new Date(), "yyyyMMddhhmmsss") + ".zip";
        String agent = request.getHeader("USER-AGENT");
        try {
            if (agent.contains("MSIE") || agent.contains("Trident")) {
                downloadName = java.net.URLEncoder.encode(downloadName, "UTF-8");
            } else {
                downloadName = new String(downloadName.getBytes("UTF-8"), "ISO-8859-1");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        response.setHeader("Content-Disposition", "attachment;fileName=\"" + downloadName + "\"");


        //设置压缩流：直接写入response，实现边压缩边下载
        ZipOutputStream zipos = null;
        try {
            zipos = new ZipOutputStream(new BufferedOutputStream(response.getOutputStream()));
            //设置压缩方法
            zipos.setMethod(ZipOutputStream.DEFLATED);
        } catch (Exception e) {
            log.error("设置压缩流出现异常" + e.getMessage());
            e.printStackTrace();
        }

        //循环将文件写入压缩流
        DataOutputStream os = null;
        for (int i = 0; i < files.size(); i++) {
            File file = files.get(i);
            try {
                //添加ZipEntry，并ZipEntry中写入文件流
                //这里，加上i是防止要下载的文件有重名的导致下载失败
                zipos.putNextEntry(new ZipEntry(file.getName()));
                os = new DataOutputStream(zipos);
                InputStream is = new FileInputStream(file);
                byte[] b = new byte[100];
                int length;
                while ((length = is.read(b)) != -1) {
                    os.write(b, 0, length);
                }
                is.close();
                zipos.closeEntry();
            } catch (IOException e) {
                log.error("循环将文件写入压缩流出现异常" + e.getMessage());
                e.printStackTrace();
            }
        }

        //关闭流
        try {
            os.flush();
            os.close();
            zipos.close();
        } catch (IOException e) {
            log.error("关闭流现异常" + e.getMessage());
            e.printStackTrace();
        }

    }



}