package com.chinagas.modules.schsf.utils.listener;

import com.alibaba.excel.write.handler.SheetWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteWorkbookHolder;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddressList;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class McBasicCmtySheetWriteHandler implements SheetWriteHandler {

    private List<String> selectDataList;
    private int ls = 0;

    public McBasicCmtySheetWriteHandler(List<String> selectDataList, int ls) {
        this.selectDataList = selectDataList;
        this.ls = ls;
    }

    /**
     * 想实现Excel引用其他sheet页数据作为单元格下拉选项值，
     * 需要重写该方法
     *
     * @param writeWorkbookHolder
     * @param writeSheetHolder
     */
    @Override
    public void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {
        // 构造下拉选项单元格列的位置，以及下拉选项可选参数值的map集合
        Map<Integer, List<String>> selectParamMap = new HashMap<>();
        selectParamMap.put(ls, selectDataList); // 假设下拉选项放在第一列

        // 获取第一个sheet页
        Sheet sheet = writeSheetHolder.getCachedSheet();
        // 获取sheet页的数据校验对象
        DataValidationHelper helper = sheet.getDataValidationHelper();
        // 获取工作簿对象，用于创建存放下拉数据的字典sheet数据页
        Workbook workbook = writeWorkbookHolder.getWorkbook();

        // 迭代索引，用于存放下拉数据的字典sheet命名
        int index = 1;
        for (Map.Entry<Integer, List<String>> entry : selectParamMap.entrySet()) {
            // 设置存放下拉数据的字典sheet，并把这些sheet隐藏掉，这样用户交互更友好
            String dictSheetName = "dict_hide_sheet" + index;
            Sheet dictSheet = workbook.createSheet(dictSheetName);
            // 隐藏字典sheet页
            workbook.setSheetHidden(index++, true);
            // 创建一个名为“dictSheetName”的名称，指向字典表中的数据区域
            String refers = dictSheetName + "!$A$1:$A$" + (entry.getValue().size() + 1);
            Name name = workbook.createName();
            name.setNameName(dictSheetName);
            name.setRefersToFormula(refers);

            // 向字典sheet写数据，从第一行开始写
            for (int i = 0; i < entry.getValue().size(); i++) {
                Row row = dictSheet.createRow(i);
                Cell cell = row.createCell(0);
                cell.setCellValue(entry.getValue().get(i));
            }

            // 设置下拉列表覆盖的行数，从第一行开始到最后一行
            CellRangeAddressList infoList = new CellRangeAddressList(1, Short.MAX_VALUE, entry.getKey(), entry.getKey());

            // 创建下拉列表约束
            DataValidationConstraint constraint = helper.createFormulaListConstraint(dictSheetName);
            DataValidation dataValidation = helper.createValidation(constraint, infoList);
            sheet.addValidationData(dataValidation);

            index++;
        }
    }
}