package com.gunshi.project.ss.service;


import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.write.metadata.WriteSheet;
import com.alibaba.excel.write.metadata.WriteTable;
import com.alibaba.excel.write.style.column.LongestMatchColumnWidthStyleStrategy;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;

import com.gunshi.project.ss.entity.dto.ExportCommonDto;
import com.gunshi.project.ss.entity.so.HisWaterDataPageSo;
import com.gunshi.project.ss.entity.vo.HisWaterDataVo;
import com.gunshi.project.ss.mapper.HisWaterDataMapper;
import com.gunshi.project.ss.model.HisWaterData;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.io.IOException;
import java.io.Serializable;
import java.math.BigDecimal;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
@Transactional(rollbackFor = Exception.class)
public class HisWaterDataService extends ServiceImpl<HisWaterDataMapper, HisWaterData> {
    public Page<HisWaterDataVo> pageQuery(HisWaterDataPageSo page) {
        Page<HisWaterDataVo> hisWaterDataPage = this.baseMapper.queryPage(page.getPageSo().toPage(),page);
        fillList(hisWaterDataPage);
        return hisWaterDataPage;
    }

    private void fillList(Page<HisWaterDataVo> ret) {
        if (ret.getRecords() != null) {
            queryChild(ret.getRecords());
        }
    }

    private void queryChild(List<HisWaterDataVo> records) {
        for (HisWaterDataVo record : records) {
            LambdaQueryWrapper<HisWaterData> queryWrapper = new LambdaQueryWrapper<>();
            queryWrapper.eq(HisWaterData::getYear, record.getYear())
                    .eq(HisWaterData::getType,2)
                    .orderByAsc(HisWaterData::getMonth);
            record.setChildren(this.list(queryWrapper));
        }
    }

    public boolean saveData(HisWaterDataVo dto) {
        checkParam(dto);
        HisWaterData hisWaterData = new HisWaterData();
        BeanUtils.copyProperties(dto,hisWaterData);
        List<HisWaterData> list = dto.getChildren();
        list.stream().forEach(o ->{
            o.setId(null);
        });
        hisWaterData.setId(null);
        list.add(hisWaterData);
        boolean flag = saveBatch(list);
        return flag;
    }

    private void checkParam(HisWaterDataVo dto) {
        Long id = dto.getId();
        LambdaQueryWrapper<HisWaterData> queryWrapper = Wrappers.lambdaQuery();
        queryWrapper.eq(HisWaterData::getYear,dto.getYear())
                .eq(HisWaterData::getType,1);
        if(id != null){
            queryWrapper.ne(HisWaterData::getId,id);
        }
        if(this.count(queryWrapper ) > 0){
            throw new IllegalArgumentException("该年份已存在历史降雨资料");
        }
        Long len = dto.getChildren().stream().map(HisWaterData::getMonth).distinct().collect(Collectors.counting());
        if(dto.getChildren().size() != len.intValue()){
            throw new IllegalArgumentException("月份不可重复");
        }
    }


    public boolean updateData(HisWaterDataVo dto) {
        checkParam(dto);
        HisWaterData hisWaterData = new HisWaterData();
        BeanUtils.copyProperties(dto,hisWaterData);
        if(dto.getChildren() == null || dto.getChildren().isEmpty()){
            dto.setAvgWater(BigDecimal.ZERO);
        }
        updateById(hisWaterData);
        deleteMonthData(dto.getYear());
        List<HisWaterData> list = dto.getChildren();
        list.stream().forEach(o ->{
            o.setYear(dto.getYear());
        });
        return saveBatch(list);
    }

    private void deleteMonthData(Integer year) {
        LambdaQueryWrapper<HisWaterData> queryWrapper = Wrappers.lambdaQuery();
        queryWrapper.eq(HisWaterData::getYear,year)
                .eq(HisWaterData::getType,2);
        this.remove(queryWrapper);
    }

    public Boolean removeData(Serializable id) {
        HisWaterData hisWaterData = this.getById(id);
        deleteMonthData(hisWaterData.getYear());
        return this.removeById(id);
    }

    public void export(List<HisWaterDataVo> records, HttpServletResponse response) {
        try {
            // 设置响应头
            String fileName = URLEncoder.encode("历史蓄水量数据", "UTF-8").replaceAll("\\+", "%20");
            response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
            response.setCharacterEncoding("utf-8");
            response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + ".xlsx");

            // 创建ExcelWriter
            ExcelWriter excelWriter = EasyExcel.write(response.getOutputStream())
                    .registerWriteHandler(new LongestMatchColumnWidthStyleStrategy()) // 自动列宽
                    .build();

            // 创建主工作表
            WriteSheet writeSheet = EasyExcel.writerSheet("历史蓄水量数据").build();

            // 当前行数据
            List<List<Object>> dataList = new ArrayList<>();

            // 遍历每年的数据
            for (HisWaterDataVo yearData : records) {
                // 添加年份标题行
                List<Object> yearRow = new ArrayList<>();
                yearRow.add(yearData.getYear() + "年");
                yearRow.add(""); // 第二列为空
                dataList.add(yearRow);

                // 添加表头
                List<Object> headerRow = new ArrayList<>();
                headerRow.add("月份");
                headerRow.add("月份平均蓄水量");
                dataList.add(headerRow);

                // 添加月份数据
                if (yearData.getChildren() != null) {
                    for (HisWaterData monthData : yearData.getChildren()) {
                        List<Object> monthRow = new ArrayList<>();
                        monthRow.add(monthData.getMonth() + "月");
                        monthRow.add(monthData.getAvgWater());
                        dataList.add(monthRow);
                    }
                }

                // 添加年度总蓄水量行
                List<Object> totalRow = new ArrayList<>();
                totalRow.add("年度总蓄水量");
                totalRow.add(yearData.getAvgWater());
                dataList.add(totalRow);

                // 添加空行分隔
                dataList.add(new ArrayList<>());
                dataList.add(new ArrayList<>());
            }

            // 创建表格并写入数据
            WriteTable writeTable = EasyExcel.writerTable()
                    .needHead(false) // 不显示表头，因为我们手动添加了
                    .build();

            // 写入数据
            excelWriter.write(dataList, writeSheet, writeTable);

            // 关闭流
            excelWriter.finish();

        } catch (IOException e) {
            throw new RuntimeException("导出Excel失败", e);
        }
    }

    public List<HisWaterData> yearList() {
        LambdaQueryWrapper<HisWaterData> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(HisWaterData::getType,1);
        return this.baseMapper.selectList(queryWrapper);
    }

    public List<HisWaterDataVo> selectList(ExportCommonDto dto) {
        List<HisWaterDataVo> hisWaterDataVos = this.baseMapper.selectYearList(dto);
        if(!hisWaterDataVos.isEmpty()){
            queryChild(hisWaterDataVos);
        }
        return hisWaterDataVos;
    }

    public List<Integer> getYearList() {
        return this.baseMapper.selectYear();
    }
}