package com.engine.salary.util.excel;

import cn.hutool.core.util.StrUtil;
import com.engine.salary.util.FileUtils;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellUtil;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.regex.Pattern;

public class ExcelFillUtils {

    //    public static final String FILL_EXPRESSION_REGEX = "\\{\\.\\w+\\}";
    private static final String FILL_EXPRESSION_REGEX = "\\{\\.[\\p{L}\\p{M}\\S]+\\}";


    /**
     * 给定模板，指定某个页签，将数据填充到模板中的指定页签，并将数据导入到指定文件上。
     *
     * @param template  模板文件地址
     * @param sheetIndex     页签下标
     * @param data      待填充的数据,数据格式如下
     *                  [
     *                  {"colName1":v1 ,"colName2":v2...},
     *                  {"colName1":v1 ,"colName2":v2...}
     *                  ,...
     *                  ]
     * @return 新生成的副本文件
     */
    public static XSSFWorkbook fillOneSheet(String template, Integer sheetIndex, List<Map<String, Object>> data) {

        try  {
            XSSFWorkbook workbook = new XSSFWorkbook(new FileInputStream(template));
            fill(workbook, sheetIndex, data);//填充数据
            return workbook;
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * 给定模板，指定某个页签，将数据填充到模板中的指定页签，并将数据导入到指定文件上。
     *
     * @param template  模板文件流
     * @param sheetIndex 页签名称
     * @param data      待填充的数据,数据格式如下
     *                  [
     *                  {"colName1":v1 ,"colName2":v2...},
     *                  {"colName1":v1 ,"colName2":v2...}
     *                  ,...
     *                  ]
     * @return 新生成的副本文件
     */
    public static XSSFWorkbook fillOneSheet(InputStream template, Integer sheetIndex, List<Map<String, Object>> data) {

        try{
            XSSFWorkbook workbook = new XSSFWorkbook(template);
            fill(workbook, sheetIndex, data);//填充数据
            return workbook;
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * 给定模板,将数据填充到模板中的多个页签，并在模板所在目录生成新的副本文件。
     *
     * @param template 模板文件地址
     * @param datas    待填充的数据集,数据格式如下
     *                 {
     *                 "SheetName1":[
     *                 {"colName1":v1 ,"colName2":v2...},
     *                 {"colName1":v1 ,"colName2":v2...}
     *                 ,...
     *                 ],
     *                 "SheetName2":[
     *                 {"colName1":v1 ,"colName2":v2...}
     *                 {"colName1":v1 ,"colName2":v2...}
     *                 ,...
     *                 ],
     *                 ...
     *                 }
     */
    public static String fillMultipleSheet(String template, Map<Integer, List<Map<String, Object>>> datas) {
        return fillMultipleSheet(template, FileUtils.getAvailableFullName(template), datas);
    }

    /**
     * 给定模板,将数据填充到模板中的多个页签，并将数据导入到指定文件上。
     *
     * @param template 模板文件地址
     * @param datas    待填充的数据集,数据格式如下
     *                 {
     *                 "SheetName1":[
     *                 {"colName1":v1 ,"colName2":v2...},
     *                 {"colName1":v1 ,"colName2":v2...}
     *                 ,...
     *                 ],
     *                 "SheetName2":[
     *                 {"colName1":v1 ,"colName2":v2...}
     *                 {"colName1":v1 ,"colName2":v2...}
     *                 ,...
     *                 ],
     *                 ...
     *                 }
     */
    public static String fillMultipleSheet(String template, String outputFile, Map<Integer, List<Map<String, Object>>> datas) {

        try (Workbook workbook = new XSSFWorkbook(new FileInputStream(template))) {

            datas.forEach((sheetIndex, data) -> fill(workbook, sheetIndex, data));//填充数据
            refreshFormula(workbook);//刷新公式

            try (FileOutputStream outputStream = new FileOutputStream(outputFile)) {
                workbook.write(outputStream);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }

        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        return outputFile;
    }

    private static Workbook fill(Workbook workbook, int sheetIndex, List<Map<String, Object>> data) {

        Sheet sheet = workbook.getSheetAt(sheetIndex);
        if (sheet == null) {
            throw new RuntimeException(String.format("sheet [%s] does not exist.", sheetIndex));
        }

        //找到所有的表达式单元格
        Map<String, Cell> expressionCellMap = new HashMap<>();
        for (int i = 0; i < sheet.getPhysicalNumberOfRows(); i++) {
            Row row = sheet.getRow(i);
            for (int j = 0; j < row.getPhysicalNumberOfCells(); j++) {
                Cell cell = row.getCell(j);
                if (!Objects.isNull(cell) && isFillExpression(cell.getStringCellValue())) {//判断该单元格是否是填充公式
                    expressionCellMap.put(getColNameFromEx(cell.getStringCellValue()), cell);
                }
            }
        }

        //填充数据
        for (int i = 0; i < data.size(); i++) {
            Map<String, Object> dataRow = data.get(i);
            for (Map.Entry<String, Object> entry : dataRow.entrySet()) {
                String colName = entry.getKey();
                Object value = entry.getValue();
                if (expressionCellMap.containsKey(colName)) {

                    Cell cell = expressionCellMap.get(colName);//公式所在的单元格
                    int rowID = cell.getRowIndex() + i;
                    int colId = cell.getColumnIndex();

                    Row fillRow = sheet.getRow(rowID);
                    fillRow = Objects.isNull(fillRow) ? sheet.createRow(rowID) : fillRow;
                    Cell fillCell = fillRow.getCell(colId);
                    //创建的新单元格需要复制公式单元格的格式
                    fillCell = Objects.isNull(fillCell) ? CellUtil.createCell(fillRow, colId, "", cell.getCellStyle()) : fillCell;

                    if (value instanceof String) {
                        fillCell.setCellValue(String.valueOf(value));
                    } else if (value instanceof Number) {
                        fillCell.setCellValue(((Number) value).doubleValue());
                    } else {
                        throw new RuntimeException(String.format("Unsupported data type [%s].", value.getClass().toString()));
                    }

                }
            }
        }

        return workbook;
    }

    private static void refreshFormula(Workbook workbook) {
        FormulaEvaluator evaluator = workbook.getCreationHelper().createFormulaEvaluator();
        evaluator.evaluateAll();
    }

    private static boolean isFillExpression(String ex) {
        if (StrUtil.isBlank(ex)) {
            return false;
        }
        ;
        return Pattern.matches(FILL_EXPRESSION_REGEX, ex);
    }

    private static String getColNameFromEx(String ex) {
        if (!isFillExpression(ex)) throw new RuntimeException("Illegal expression " + ex);
        return ex.substring(2, ex.length() - 1);
    }
}