/*
Copyright [2020] [https://www.xiaonuo.vip]

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

Snowy采用APACHE LICENSE 2.0开源协议，您在使用过程中，需要注意以下几点：

1.请不要删除和修改根目录下的LICENSE文件。
2.请不要删除和修改Snowy源码头部的版权声明。
3.请保留源码和相关描述文件的项目出处，作者声明等。
4.分发源码时候，请注明软件出处 https://gitee.com/xiaonuobase/snowy
5.在修改包名，模块名称，项目代码等时，请注明软件出处 https://gitee.com/xiaonuobase/snowy
6.若您的项目无法满足以上几点，可申请商业授权，获取Snowy商业授权许可，请在官网购买授权，地址为 https://www.xiaonuo.vip
 */
package vip.xiaonuo.core.util;

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.hutool.core.io.FileUtil;
import cn.hutool.core.util.CharsetUtil;
import cn.hutool.core.util.ObjectUtil;
import cn.hutool.log.Log;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.Collection;
import java.util.List;

/**
 * 简单导入导出工具类
 *
 * @author xuyuxiang
 * @date 2020/6/30 17:25
 */
public class PoiUtil {

    private static final Log log = Log.get();

    /**
     * 使用流的方式导出excel
     *
     * @param excelName 要导出的文件名称，如Users.xls
     * @param pojoClass Excel实体类
     * @param data      要导出的数据集合
     * @author xuyuxiang
     * @date 2020/7/1 10:00
     */
    public static void exportExcelWithStream(String excelName, Class<?> pojoClass, Collection<?> data) {
        try {
            HttpServletResponse response = HttpServletUtil.getResponse();
            String fileName = URLEncoder.encode(excelName, CharsetUtil.UTF_8);
            response.reset();
            response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
            response.setContentType("application/octet-stream;charset=UTF-8");
            ServletOutputStream outputStream = response.getOutputStream();
            Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams(), pojoClass, data);
            workbook.write(outputStream);
            outputStream.close();
        } catch (IOException e) {
            log.error(">>> 导出数据异常：{}", e.getMessage());
        }
    }

    /**
     * 使用文件的方式导出excel
     *
     * @param filePath  文件路径，如 d:/demo/demo.xls
     * @param pojoClass Excel实体类
     * @param data      要导出的数据集合
     * @author xuyuxiang
     * @date 2020/7/1 9:58
     */
    public static void exportExcelWithFile(String filePath, Class pojoClass, Collection data) {

        try {
            //先创建父文件夹
            FileUtil.mkParentDirs(filePath);
            File file = FileUtil.file(filePath);
            Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams(), pojoClass, data);
            FileOutputStream fos = new FileOutputStream(file);
            workbook.write(fos);
            fos.close();
        } catch (IOException e) {
            log.error(">>> 导出数据异常：{}", e.getMessage());
        }

    }

    /**
     * 根据文件路径来导入Excel
     *
     * @param filePath   文件路径
     * @param titleRows  表标题的行数
     * @param headerRows 表头行数
     * @param pojoClass  Excel实体类
     * @author xuyuxiang
     * @date 2020/7/1 9:58
     */
    public static <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass) {
        //判断文件是否存在
        if (ObjectUtil.isEmpty(filePath)) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
        } catch (Exception e) {
            log.error(">>> 导入数据异常：{}", e.getMessage());
        }
        return list;
    }

    /**
     * 根据接收的Excel文件来导入Excel,并封装成实体类
     *
     * @param file       上传的文件
     * @param titleRows  表标题的行数
     * @param headerRows 表头行数
     * @param pojoClass  Excel实体类
     * @author xuyuxiang
     * @date 2020/7/1 9:57
     */
    public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass) {
        if (ObjectUtil.isNull(file)) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
        } catch (Exception e) {
            log.error(">>> 导入数据异常：{}", e.getMessage());
        }
        return list;
    }

}