package com.lf.server.service.data;

import com.lf.server.entity.ctrl.DownloadReqEntity;
import com.lf.server.entity.data.DownloadEntity;
import com.lf.server.entity.data.MetaFileEntity;
import com.lf.server.entity.sys.UserEntity;
import com.lf.server.helper.*;
import com.lf.server.mapper.data.DownloadMapper;
import net.lingala.zip4j.ZipFile;
import net.lingala.zip4j.model.ZipParameters;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.File;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

/**
 * 下载记录
 * @author WWW
 */
@Service
public class DownloadService implements DownloadMapper {
    @Autowired
    PathHelper pathHelper;

    @Autowired
    DownloadMapper downloadMapper;

    private final static Log log = LogFactory.getLog(DownloadService.class);

    @Override
    public Integer selectCount(String name) {
        name = StringHelper.getLikeStr(name);

        return downloadMapper.selectCount(name);
    }

    @Override
    public List<DownloadEntity> selectByPage(String name, Integer limit, Integer offset) {
        name = StringHelper.getLikeStr(name);

        return downloadMapper.selectByPage(name, limit, offset);
    }

    @Override
    public Integer selectCountForUser(Integer createUser, Integer type, String name) {
        name = StringHelper.getLikeStr(name);

        return downloadMapper.selectCountForUser(createUser, type, name);
    }

    @Override
    public List<DownloadEntity> selectByPageForUser(Integer createUser, Integer type, String name, Integer limit, Integer offset) {
        name = StringHelper.getLikeStr(name);

        return downloadMapper.selectByPageForUser(createUser, type, name, limit, offset);
    }

    @Override
    public List<DownloadEntity> selectAll() {
        return downloadMapper.selectAll();
    }

    @Override
    public DownloadEntity selectById(int id) {
        return downloadMapper.selectById(id);
    }

    @Override
    public DownloadEntity selectByGuid(String guid) {
        return downloadMapper.selectByGuid(guid);
    }

    @Override
    public Integer insert(DownloadEntity entity) {
        return downloadMapper.insert(entity);
    }

    @Override
    public Integer inserts(List<DownloadEntity> list) {
        return downloadMapper.inserts(list);
    }

    @Override
    public Integer delete(int id) {
        return downloadMapper.delete(id);
    }

    @Override
    public Integer deletes(List<Integer> ids) {
        return downloadMapper.deletes(ids);
    }

    @Override
    public Integer update(DownloadEntity entity) {
        return downloadMapper.update(entity);
    }

    @Override
    public Integer updates(List<DownloadEntity> list) {
        return downloadMapper.updates(list);
    }

    /**
     * 获取下载文件路径
     *
     * @param de 下载实体类
     * @return 下载文件路径
     */
    public String getDownloadFilePath(DownloadEntity de) {
        return pathHelper.getConfig().getDownloadPath() + File.separator + de.getUrl();
    }

    /**
     * 校验密码有效性
     *
     * @param reqEntity 请求下载实体类
     * @return 是/否有效
     */
    public boolean validatePwd(DownloadReqEntity reqEntity) {
        try {
            String pwd = RsaHelper.decrypt(reqEntity.getPwd());
            if (StringHelper.isEmpty(pwd) || !StringHelper.checkPwdValid(pwd)) {
                return false;
            }

            reqEntity.setPwd(pwd);

            return true;
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
            return false;
        }
    }

    /**
     * 解密
     *
     * @param pwd 加密密码
     * @return 原始密码
     */
    public String decryptPwd(String pwd) {
        try {
            return RsaHelper.decrypt(pwd);
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
            return null;
        }
    }

    /**
     * 打包文件
     *
     * @param ue   用户实体
     * @param list 元数据文件集合
     * @param pwd  密码
     * @return 下载文件GUID
     */
    public String zipFiles(UserEntity ue, List<MetaFileEntity> list, String pwd) {
        rmRepeatMetaFiles(list);

        String downloadPath = pathHelper.getDownloadFullPath();
        String zipName = StringHelper.YMDHMS2_FORMAT.format(new Date()) + ".zip";
        String zipFile = downloadPath + File.separator + zipName;

        ZipFile zip = Zip4jHelper.createZipFile(zipFile, pwd);
        ZipParameters params = Zip4jHelper.getZipParams();

        addMetaFiles(zip, params, list);

        return null;
    }

    /**
     * 移除重复的元数据文件
     */
    private void rmRepeatMetaFiles(List<MetaFileEntity> list) {
        List<String> guidList = new ArrayList<>();

        int i = 0;
        while (i < list.size()) {
            MetaFileEntity entity = list.get(i);
            if (guidList.contains(entity.getGuid())) {
                list.remove(i);
                continue;
            }

            guidList.add(entity.getGuid());
            i++;
        }
    }

    /**
     * 添加元数据文件至Zip包
     */
    private void addMetaFiles(ZipFile zip, ZipParameters params, List<MetaFileEntity> list) {
        String uploadPath = pathHelper.getConfig().getUploadPath();
        for (MetaFileEntity entity : list) {
            String filePath = uploadPath + File.separator + entity.getPath();
            File file = new File(filePath);
            File newFile = new File(filePath.replace(entity.getGuid(), entity.getName()));

            try {
                file.renameTo(newFile);
                zip.addFile(newFile, params);
            } catch (Exception ex) {
                log.error(ex.getMessage(), ex);
            } finally {
                newFile.renameTo(file);
            }
        }
    }
}