package com.mzl.flower.utils;

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.util.CellRangeAddress;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class ExcelExportUtil {
    //显示的导出表的标题
    private String title;
    //导出表的列名
    private String[] rowName ;

    private List<HeadRow> headRows;

    private List<Object[]> dataList = new ArrayList<>();

    private HttpServletResponse response;

    //默认日期格式
    private String dateFormat = "yyyy-MM-dd";

    public static class HeadRow{
        int rowIndex;
        List<HeadColumn> columns;

        public HeadRow(int rowIndex, List<HeadColumn> columns){
            this.columns = columns;
            this.rowIndex = rowIndex;
        }
    }

    public static class HeadColumn{
        int columnIndex;
        int rowspan;
        int colspan;
        String name;

        public HeadColumn(int columnIndex, int rowspan, int colspan, String name){
            this.columnIndex = columnIndex;
            this.rowspan = rowspan;
            this.colspan = colspan;
            this.name = name;
        }
    }

    public ExcelExportUtil(String title, List<HeadRow> headRows, List<Object[]> dataList, HttpServletResponse response){
        this.dataList = dataList;
        this.headRows = headRows;
        this.title = title;
        this.response = response;
    }

    public ExcelExportUtil(String title, List<HeadRow> headRows, List<Object[]> dataList, HttpServletResponse response, String dateFormat){
        this.dataList = dataList;
        this.headRows = headRows;
        this.title = title;
        this.response = response;
        this.dateFormat = dateFormat;
    }

    /**
     * 构造函数，传入要导出的数据
     * @param title  标题
     * @param rowName  列名
     * @param dataList 数据集合 List
     * @param response http响应
     */
    public ExcelExportUtil(String title, String[] rowName, List<Object[]> dataList, HttpServletResponse response){
        this.dataList = dataList;
        this.rowName = rowName;
        this.title = title;
        this.response = response;
    }

    /**
     * 构造函数，传入要导出的数据,带日期格式
     * @param title  标题
     * @param rowName  列名
     * @param dataList 数据集合 List
     * @param response http响应
     * @param dateFormat 日期格式
     */
    public ExcelExportUtil(String title, String[] rowName, List<Object[]> dataList, HttpServletResponse response, String dateFormat){
        this.dataList = dataList;
        this.rowName = rowName;
        this.title = title;
        this.response = response;
        this.dateFormat = dateFormat;
    }

    private int prepareHeader(HSSFSheet sheet, HSSFCellStyle columnTopStyle){
        int step = 0;
        if(headRows != null){
            for(HeadRow row : headRows){
                int firstRow = row.rowIndex;
                HSSFRow rowHeader = sheet.getRow(firstRow);
                if(rowHeader == null){
                    rowHeader = sheet.createRow(firstRow);
                }
                List<HeadColumn> columns = row.columns;
                int s = 1;
                for(HeadColumn c : columns){
                    int lastRow = firstRow + c.rowspan - 1;
                    int firstCol = c.columnIndex;
                    int lastCol = firstCol + c.colspan - 1;
                    if(lastRow > firstRow || lastCol > firstCol) {
                        for(int i = firstRow; i <= lastRow; i++){
                            for(int j = firstCol; j <= lastCol; j++){
                                HSSFRow rowHeader1 = sheet.getRow(i);
                                if(rowHeader1 == null){
                                    rowHeader1 = sheet.createRow(i);
                                }
                                HSSFCell cell = rowHeader1.getCell(j);
                                if(cell == null){
                                    cell = rowHeader1.createCell(j);
                                }
                                cell.setCellStyle(columnTopStyle);
                            }
                        }
                        sheet.addMergedRegion(new CellRangeAddress(firstRow, lastRow, firstCol, lastCol));
                    }

                    HSSFCell cell = rowHeader.getCell(firstCol);
                    if(cell == null){
                        cell = rowHeader.createCell(firstCol);
                    }

                    cell.setCellStyle(columnTopStyle);
                    cell.setCellType(CellType.STRING);
                    HSSFRichTextString text = new HSSFRichTextString(c.name);
                    cell.setCellValue(text);

                    if(s < c.rowspan){
                        s = c.rowspan;
                    }
                }
                step += s;
            }
        }else if(rowName != null){
            // 产生表格标题行
            HSSFRow rowTitle = sheet.createRow(0);
            HSSFCell cellTitle = rowTitle.createCell(0);

            sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length-1)));
            cellTitle.setCellStyle(columnTopStyle);
            cellTitle.setCellValue(title);

            // 定义所需列数
            int columnNum = rowName.length;
            HSSFRow rowRowName = sheet.createRow(2);                // 在索引2的位置创建行(最顶端的行开始的第二行)

            // 将列头设置到sheet的单元格中
            for(int n = 0; n < columnNum; n++){
                HSSFCell cellRowName = rowRowName.createCell(n);               //创建列头对应个数的单元格
                cellRowName.setCellType(CellType.STRING);             //设置列头单元格的数据类型
                HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
                cellRowName.setCellValue(text);                                 //设置列头单元格的值
                cellRowName.setCellStyle(columnTopStyle);                       //设置列头单元格样式
            }

            step = 3;
        }

        return step;
    }

    /*
     * 导出数据
     * */
    public void export() throws Exception{
        try{
            HSSFWorkbook workbook = new HSSFWorkbook();                     // 创建工作簿对象
            HSSFSheet sheet = workbook.createSheet(title);                  // 创建工作表

            //sheet样式定义【getColumnTopStyle()/getStyle()均为自定义方法 - 在下面  - 可扩展】
            HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);//获取列头样式对象
            HSSFCellStyle style = this.getStyle(workbook);                  //单元格样式对象

            int step = prepareHeader(sheet, columnTopStyle);

            //将查询出的数据设置到sheet对应的单元格中
            if (null != dataList && dataList.size() > 0) {
                int cellNum = 0;

                for(int i = 0; i < dataList.size(); i++){
                    Object[] obj = dataList.get(i);//遍历每个对象
                    HSSFRow row = sheet.createRow(i + step);//创建所需的行数

                    for(int j = 0; j < obj.length; j++){
                        HSSFCell cell = row.createCell(j);   //设置单元格的数据类型
                        //HSSFCell  cell = row.createCell(j,HSSFCell.CELL_TYPE_STRING);   //设置单元格的数据类型

                        cell.setCellStyle(style);                                   //设置单元格样式

                        cellNum = setCellValue(cell, obj[j], cellNum, row);
                        cellNum++;
                    }
                }
            }

            if(workbook !=null){
            	OutputStream out = null;
                try{
                    String fileName = "Excel-" + String.valueOf(System.currentTimeMillis()).substring(4, 13) + ".xls";
                    String headStr = "attachment; filename=\"" + fileName + "\"";
                    response.setContentType("application/vnd.ms-excel");
                    response.setHeader("Content-Disposition", headStr);
                    response.addHeader("filename", URLEncoder.encode(fileName, "UTF-8"));
                    out = response.getOutputStream();
                    workbook.write(out);
                    out.flush();
                }
                catch (IOException e){
                }
                finally{
                	if (null != out){
                        out.close();
                    }
                }
            }

        }catch(Exception e){
            e.printStackTrace();
        }

    }

    private int setCellValue(HSSFCell cell, Object value, int cellNum, HSSFRow row){
        String textValue = null;
        if (value instanceof Integer) {
            int intValue = (Integer) value;
            cell.setCellValue(intValue);
        } else if (value instanceof Float) {
            float fValue = (Float) value;
            cell.setCellValue(fValue);
        } else if (value instanceof Double) {
            double dValue = (Double) value;
            cell.setCellValue(dValue);
        } else if (value instanceof Long) {
            long longValue = (Long) value;
            cell.setCellValue(longValue);
        } else if (value instanceof Boolean) {
            boolean bValue = (Boolean) value;
            cell.setCellValue(bValue);
        } else if (value instanceof Date) {
            Date date = (Date) value;
            SimpleDateFormat sdf = new SimpleDateFormat(dateFormat);
            textValue = sdf.format(date);
        } else if (value instanceof ZonedDateTime){
            DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(dateFormat);
            textValue = dateTimeFormatter.format((ZonedDateTime) value);
        }else if (value instanceof String[]) {
            String[] strArr = (String[]) value;
            for (int j = 0; j < strArr.length; j++) {
                String str = strArr[j];
                cell.setCellValue(str);
                if (j != strArr.length - 1) {
                    cellNum++;
                    cell = row.createCell(cellNum);
                }
            }
        } else if (value instanceof Double[]) {
            Double[] douArr = (Double[]) value;
            for (int j = 0; j < douArr.length; j++) {
                Double val = douArr[j];
                // 值不为空则set Value
                if (val != null) {
                    cell.setCellValue(val);
                }

                if (j != douArr.length - 1) {
                    cellNum++;
                    cell = row.createCell(cellNum);
                }
            }
        } else {
            // 其它数据类型都当作字符串简单处理
            String empty = "";
            textValue = value == null ? empty : value.toString();
        }
        if (textValue != null) {
            HSSFRichTextString richString = new HSSFRichTextString(textValue);
            cell.setCellValue(richString);
        }
        return cellNum;
    }

    /*
     * 列头单元格样式
     */
    private HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) {

        // 设置字体
        HSSFFont font = workbook.createFont();
        //设置字体大小
        font.setFontHeightInPoints((short)11);
        //字体加粗
        font.setBold(true);
        //设置字体名字
        font.setFontName("Courier New");
        //设置样式;
        HSSFCellStyle style = workbook.createCellStyle();
        //设置底边框;
        style.setBorderBottom(BorderStyle.THIN);
        //设置底边框颜色;
        style.setBottomBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        //设置左边框;
        style.setBorderLeft(BorderStyle.THIN);
        //设置左边框颜色;
        style.setLeftBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        //设置右边框;
        style.setBorderRight(BorderStyle.THIN);
        //设置右边框颜色;
        style.setRightBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        //设置顶边框;
        style.setBorderTop(BorderStyle.THIN);
        //设置顶边框颜色;
        style.setTopBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        //在样式用应用设置的字体;
        style.setFont(font);
        //设置自动换行;
        style.setWrapText(false);
        //设置水平对齐的样式为居中对齐;
        style.setAlignment(HorizontalAlignment.CENTER);
        //设置垂直对齐的样式为居中对齐;
        style.setVerticalAlignment(VerticalAlignment.CENTER);

        return style;

    }

    /*
     * 列数据信息单元格样式
     */
    private HSSFCellStyle getStyle(HSSFWorkbook workbook) {
        // 设置字体
        HSSFFont font = workbook.createFont();
        //设置字体大小
        //font.setFontHeightInPoints((short)10);
        //字体加粗
        //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        //设置字体名字
        font.setFontName("Courier New");
        //设置样式;
        HSSFCellStyle style = workbook.createCellStyle();
        //设置底边框;
        style.setBorderBottom(BorderStyle.THIN);
        //设置底边框颜色;
        style.setBottomBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        //设置左边框;
        style.setBorderLeft(BorderStyle.THIN);
        //设置左边框颜色;
        style.setLeftBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        //设置右边框;
        style.setBorderRight(BorderStyle.THIN);
        //设置右边框颜色;
        style.setRightBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        //设置顶边框;
        style.setBorderTop(BorderStyle.THIN);
        //设置顶边框颜色;
        style.setTopBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        //在样式用应用设置的字体;
        style.setFont(font);
        //设置自动换行;
        style.setWrapText(true);
        //设置水平对齐的样式为居中对齐;
        style.setAlignment(HorizontalAlignment.CENTER);
        //设置垂直对齐的样式为居中对齐;
        style.setVerticalAlignment(VerticalAlignment.CENTER);

        return style;

    }
}