package com.iformall.service;


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.afterturn.easypoi.excel.entity.enmus.ExcelType;
import com.iformall.common.ErrorCode;
import com.iformall.exception.MallinkException;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;

@Service
public class ExcelService {
    private final Logger logger = LoggerFactory.getLogger(this.getClass());


    public void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, boolean isCreateHeader, HttpServletResponse response)
    {
        ExportParams exportParams = new ExportParams(title, sheetName);
        exportParams.setCreateHeadRows(isCreateHeader);
        exportParams.setType(ExcelType.XSSF);
        defaultExport(list, pojoClass, fileName, response, exportParams, false);
    }

    public void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, HttpServletResponse response, boolean template)
    {
        defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName, ExcelType.XSSF), template);
    }

    public void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response)
    {
        defaultExport(list, fileName, response);
    }

    private void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams, boolean template)
    {
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams,pojoClass,list);
        if (workbook != null) {
            if (template) {
                Sheet sheetAt = workbook.getSheetAt(0);
                CellStyle cellStyle = workbook.createCellStyle();
                Font font = workbook.createFont();
                font.setColor(IndexedColors.RED.getIndex());
                cellStyle.setFont(font);
                Row row = sheetAt.createRow(sheetAt.getLastRowNum() + 2);
                Cell cell = row.createCell(0);
                cell.setCellValue("*为必填字段(导入数据时此行文字请删除)");
                cell.setCellStyle(cellStyle);
            }
        }
        downLoadExcel(fileName, response, workbook);
    }

    private void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response)
    {
        Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);
        if (workbook != null);
            downLoadExcel(fileName, response, workbook);
    }

    private void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook)
    {
        try {
            response.setCharacterEncoding("UTF-8");
            response.setHeader("content-Type", "application/vnd.ms-excel");
            response.setHeader("Content-Disposition",
                    "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            workbook.write(response.getOutputStream());        }
        catch (IOException e)
        {
            throw new MallinkException(ErrorCode.EXCEL_EXPORT_ERROR.getCode(),e.getMessage());
        }
    }

    public <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass) {
        if (StringUtils.isBlank(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 (NoSuchElementException e){
            throw new MallinkException(ErrorCode.EXCEL_IMPORT_ERROR.getCode(),"模板不能为空");
        } catch (Exception e) {
            e.printStackTrace();
            throw new MallinkException(ErrorCode.EXCEL_IMPORT_ERROR.getCode(),e.getMessage());
        }
        return list;
    }

    public <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass) {
        if (file == null) {
            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 (NoSuchElementException e) {
            throw new MallinkException(ErrorCode.EXCEL_IMPORT_ERROR.getCode(),"excel文件不能为空");
        } catch (Exception e) {
            throw new MallinkException(ErrorCode.EXCEL_IMPORT_ERROR.getCode(),e.getMessage());
        }
        return list;

    }
}
