package com.highdatas.mdm.util;

import com.highdatas.mdm.entity.SysField;
import com.highdatas.mdm.entity.ViewMappingItem;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.streaming.SXSSFSheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;

/**
 * @author kimi
 * @description
 * @date 2020-04-17 12:16
 */

@Slf4j
public class ExcelUtil {


    /**
     * @param in
     * @param fileName
     * @return
     */
    public static List<ViewMappingItem> getViewMappingByExcel(InputStream in, String fileName) {

        List list = new ArrayList<>();
        Workbook work = null;
        try {
            // 创建excel工作簿
            work = getWorkbook(in, fileName);
            if (null == work) {
                throw new Exception("创建Excel工作薄为空！");
            }

            Sheet sheet = null;
            Row row = null;
            Cell cell = null;

            for (int i = 0; i < work.getNumberOfSheets(); i++) {

                sheet = work.getSheetAt(i);
                if (sheet == null) {
                    continue;
                }

                // 滤过第一行标题
                for (int j = sheet.getFirstRowNum(); j <= sheet.getLastRowNum(); j++) {
                    row = sheet.getRow(j);
                    if (row == null || row.getFirstCellNum() == j) {
                        continue;
                    }

                    ViewMappingItem item = new ViewMappingItem();
                    Cell preCell = row.getCell(0);
                    if (preCell != null) {
                        item.setPre(preCell.getStringCellValue());
                    }

                    Cell fixCell = row.getCell(1);
                    if (fixCell != null) {
                        item.setFix(getValByCell(fixCell).toString());
                    }

                    list.add(item);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        } finally {
            try {
                work.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return list;
    }

    private static Object getValByCell(Cell cell) {
        if (cell == null) {
            return "";
        }
        Object obj = null;
        switch (cell.getCellTypeEnum()) {
            case BOOLEAN:
                obj = cell.getBooleanCellValue();
                break;
            case ERROR:
                obj = cell.getErrorCellValue();
                break;
            case FORMULA:
                try {
                    obj = String.valueOf(cell.getStringCellValue());
                } catch (IllegalStateException e) {
                    String valueOf = String.valueOf(cell.getNumericCellValue());
                    BigDecimal bd = new BigDecimal(Double.valueOf(valueOf));
                    bd = bd.setScale(2, RoundingMode.HALF_UP);
                    obj = bd;
                }
                break;
            case NUMERIC:
                obj = cell.getNumericCellValue();
                break;
            case STRING:
                String value = String.valueOf(cell.getStringCellValue());
                value = value.replace(" ", "");
                value = value.replace("\n", "");
                value = value.replace("\t", "");
                obj = value;
                break;
            default:
                break;
        }
        return obj;

    }

    /**
     * 判断文件格式
     *
     * @param in
     * @param fileName
     * @return
     */
    private static Workbook getWorkbook(InputStream in, String fileName) throws Exception {

        Workbook book = null;
        String filetype = fileName.substring(fileName.lastIndexOf("."));

        if (".xls".equals(filetype)) {
            book = new HSSFWorkbook(in);
        } else if (".xlsx".equals(filetype)) {
            book = new XSSFWorkbook(in);
        } else {
            throw new Exception("请上传excel文件！");
        }

        return book;
    }

    public static void export(HttpServletResponse response, List<Map<String, Object>> importlist, ArrayList<SysField> fieldList) throws UnsupportedEncodingException {
        //获取数据集
        List<Map<String, Object>> datalist = importlist;

        //声明一个工作薄
        SXSSFWorkbook workbook = new SXSSFWorkbook();
        //生成一个表格
        SXSSFSheet sheet = workbook.createSheet();
        //设置表格默认列宽度为15个字节
        sheet.setDefaultColumnWidth((short) 15);

        //获取字段名数组
//        String[] tableAttributeName = attributeNames;
//        //获取对象属性
//        Field[] fields = ClassUtil.getClassAttribute(importlist.get(0));
//        //获取对象get方法
//        List<Method> methodList = ClassUtil.getMethodGet(importlist.get(0));

        //循环字段名数组，创建标题行
        Row row = sheet.createRow(0);

        for (int j = 0; j < fieldList.size(); j++) {
            //创建列
            SysField sysField = fieldList.get(j);
            Cell cell = row.createCell(j);
            //设置单元类型为String
            cell.setCellType(CellType.STRING);
            cell.setCellValue(sysField.getAlias());
        }
        //创建普通行
        for (int i = 0; i < datalist.size(); i++) {
            //因为第一行已经用于创建标题行，故从第二行开始创建
            row = sheet.createRow(i + 1);
            //如果是第一行就让其为标题行

            Map<String, Object> oneData = datalist.get(i);
            for (int j = 0; j < fieldList.size(); j++) {
                //创建列
                SysField sysField = fieldList.get(j);

                Cell cell = row.createCell(j);
                cell.setCellType(CellType.STRING);
                //
                Object value = oneData.get(sysField.getField());
                cell.setCellValue(transCellType(value));
            }
        }
        response.setContentType("application/octet-stream;charset=UTF-8");
        response.setCharacterEncoding("UTF-8");
        response.setHeader("content-type", "application/octet-stream;charset=UTF-8");
        //默认Excel名称
        response.setHeader("Content-Disposition", "attachment;fileName=" + URLEncoder.encode("mapping数据.xlsx", "UTF-8"));

        try {
            response.flushBuffer();
            workbook.write(response.getOutputStream());
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    private static String transCellType(Object value) {
        String str = null;
        if (value instanceof Date) {
            Date date = (Date) value;
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            str = sdf.format(date);
        } else {
            str = String.valueOf(value);
            if (str == "null") {
                str = "";
            }
        }

        return str;
    }

}