package com.atguigu.yygh.cmn.service.impl;

import com.alibaba.excel.EasyExcel;
import com.atguigu.yygh.cmn.listener.DictListener;
import com.atguigu.yygh.cmn.mapper.DictMapper;
import com.atguigu.yygh.cmn.service.DictService;
import com.atguigu.yygh.model.cmn.Dict;
import com.atguigu.yygh.vo.cmn.DictEeVo;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;

@Service
public class DictServiceImpl extends ServiceImpl<DictMapper, Dict> implements DictService {

    //根据上级id查询子数据列表
    @Override
    @Cacheable(value = "dict",keyGenerator = "keyGenerator")
    public List<Dict> findChildData(Long id) {
        QueryWrapper<Dict> wrapper=new QueryWrapper<>();
        wrapper.eq("parent_id",id);
        List<Dict> list = baseMapper.selectList(wrapper);
        //向list集合中的每个dict对象中设置hasChildren
        list.forEach(x->{
            Long dictId = x.getId();
            boolean isChild = this.isChildren(dictId);
            x.setHasChildren(isChild);
        });
        return list;
    }

    //导出数据字典接口
    @Override
    public void exportDictData(HttpServletResponse response) {
        //设置下载信息
        response.setContentType("application/vnd.ms-excel");
        response.setCharacterEncoding("utf-8");
// 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系
        String fileName = "dict";
        response.setHeader("Content-disposition", "attachment;filename="+ fileName + ".xlsx");

        //查询数据库
        List<Dict> dictList = baseMapper.selectList(null);
        //Dict-->DictEeVo
        List<DictEeVo> dictEeVoList=new ArrayList<>();
        dictList.forEach(x->{
            DictEeVo dictEeVo=new DictEeVo();
            BeanUtils.copyProperties(x,dictEeVo);
            dictEeVoList.add(dictEeVo);
        });

        try {
            //调用方法实现写操作
            EasyExcel.write(response.getOutputStream(), DictEeVo.class)
                    .sheet("dict")
                    .doWrite(dictEeVoList);
        } catch (IOException e) {
            e.printStackTrace();
        }


    }

    //导入数据字典
    @Override
    @CacheEvict(value = "dict", allEntries=true)
    public void importDictData(MultipartFile file) {
        try {
            //excel数据取出来并添加到数据库中
            EasyExcel.read(file.getInputStream(),DictEeVo.class,new DictListener(baseMapper))
            .sheet()
            .doRead();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //根据dictcode和value查询
    @Override
    public String getDictName(String dictCode, String value) {
        //如果dictCode为空，直接根据value查询
        if(StringUtils.isEmpty(dictCode)) {
            //直接根据value查询
            QueryWrapper<Dict> wrapper = new QueryWrapper<>();
            wrapper.eq("value",value);
            Dict dict = baseMapper.selectOne(wrapper);
            return dict.getName();
        } else {//如果dictCode不为空，根据dictCode和value查询
            //根据dictcode查询dict对象，得到dict的id值
            Dict codeDict = this.getDictByDictCode(dictCode);
            Long parent_id = codeDict.getId();
            //根据parent_id和value进行查询
            Dict finalDict = baseMapper.selectOne(new QueryWrapper<Dict>()
                    .eq("parent_id", parent_id)
                    .eq("value", value));
            return finalDict.getName();
        }
    }

    //根据dictCode获取下级节点
    @Override
    public List<Dict> findByDictCode(String dictCode) {
        //根据dictCode获取对应id
        Dict dict = getDictByDictCode(dictCode);
        //根据id获取下层子节点
        List<Dict> childData = this.findChildData(dict.getId());
        return childData;
    }

    //根据dictCode查询dict对象
    private Dict getDictByDictCode(String dictCode) {
        QueryWrapper<Dict> wrapper = new QueryWrapper<>();
        wrapper.eq("dict_code",dictCode);
        Dict codeDict = baseMapper.selectOne(wrapper);
        return codeDict;
    }

    //判断id下面是否有子数据
    private boolean isChildren(Long id){
        QueryWrapper<Dict> wrapper=new QueryWrapper<>();
        wrapper.eq("parent_id",id);
        Integer count = baseMapper.selectCount(wrapper);
        return count > 0;
    }
}
