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/*
 * Copyright (C) 2018  Sun.Hao
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */

package lodsve.core.utils;

import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
import org.apache.commons.beanutils.BeanUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.InputStream;
import java.util.*;

/**
 * Excel导入的工具类.
 *
 * @author sunhao([email protected])
 * @version V1.0, 14-2-24 下午2:07
 */
public class ExcelUtils {
    private static final Logger logger = LoggerFactory.getLogger(ExcelUtils.class);
    /**
     * 成功
     */
    public static final Integer STATUS_OK = 1;
    /**
     * 失败
     */
    public static final Integer STATUS_NO = 0;

    /**
     * 私有化构造器
     */
    private ExcelUtils(){

    }

    /**
     * 获取excel文件中的数据对象
     *
     * @param is                        excel
     * @param excelColumnNames          excel中每个字段的英文名(应该与pojo对象的字段名一致,顺序与excel一致)
     * @return                          excel每行是list一条记录，map是对应的"字段名-->值"
     * @throws Exception
     */
    public static List> getImportData(InputStream is, List excelColumnNames) throws Exception {
        logger.debug("InputStream:{}", is);
        if (is == null) {
            return Collections.emptyList();
        }

        Workbook workbook = null;
        try {
            //拿到excel
            workbook = Workbook.getWorkbook(is);
        } catch (BiffException | IOException e) {
            logger.error(e.getMessage(), e);
            return Collections.emptyList();
        }
        logger.debug("workbook:{}", workbook);

        //第一个sheet
        Sheet sheet = workbook.getSheet(0);
        //行数
        int rowCounts = sheet.getRows() - 1;
        logger.debug("rowCounts:{}", rowCounts);
        List> list = new ArrayList<>(rowCounts - 1);

        //双重for循环取出数据
        for(int i = 1; i < rowCounts + 1; i++){
            Map params = new HashMap<>(excelColumnNames.size());
            //i,j i:行 j:列
            for(int j = 0; j < excelColumnNames.size(); j++){
                Cell cell = sheet.getCell(j, i);
                params.put(excelColumnNames.get(j), cell.getContents());
            }

            list.add(params);
        }

        return list;
    }

    /**
     * 获取导入数据为对象的List
     *
     * @param data
     * @param clazz
     * @param excelColumnNames
     * @param checkExcel
     * @param 
     * @return
     * @throws Exception
     */
    public static  List makeData(List> data, Class clazz, List excelColumnNames, CheckExcel checkExcel) throws Exception {
        if(data == null || data.isEmpty() || clazz == null || checkExcel == null) {
            return Collections.emptyList();
        }

        List result = new ArrayList(data.size());
        for(Map d : data) {
            if(!checkExcel.check(d)) {
                continue;
            }
            T entity = clazz.newInstance();
            for(String column : excelColumnNames) {
                BeanUtils.setProperty(entity, column, d.get(column));
            }

            result.add(entity);
        }

        return result;
    }
}