package com.ruoyi.system.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.ruoyi.common.constant.CacheConstants;
import com.ruoyi.common.constant.ResultConstants;
import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.core.domain.entity.SysDictData;
import com.ruoyi.common.core.redis.RedisCache;
import com.ruoyi.common.exception.BusinessException;
import com.ruoyi.common.utils.DictUtils;
import com.ruoyi.common.utils.spring.SpringUtils;
import com.ruoyi.system.domain.resp.DistrictTreeRespDTO;
import com.ruoyi.system.mapper.SysDistrictMapper;
import com.ruoyi.system.domain.SysDistrict;
import com.ruoyi.system.service.SysDistrictService;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;

import javax.annotation.PostConstruct;
import java.util.*;
import java.util.stream.Collectors;

import static com.ruoyi.common.utils.DictUtils.clearDictCache;

/**
 * @author hz
 * @since 2023-09-07 13:13:58
 */
@Service("sysDistrictService")
public class SysDistrictServiceImpl extends ServiceImpl<SysDistrictMapper, SysDistrict> implements SysDistrictService {

    @PostConstruct
    public void init()
    {
        loadingDistrictCache();
    }

    @Override
    public List<SysDistrict> selectAll() {
        if (SpringUtils.getBean(RedisCache.class).hasKey(CacheConstants.SYS_DISTRICT_LIST_KEY)){
            List<SysDistrict> sysDistricts = SpringUtils.getBean(RedisCache.class).getCacheObject(CacheConstants.SYS_DISTRICT_LIST_KEY);
            return sysDistricts;
        }
        List<SysDistrict> list = this.list();
        SpringUtils.getBean(RedisCache.class).setCacheObject(CacheConstants.SYS_DISTRICT_LIST_KEY, list);
        return list;
    }

    @Override
    public void loadingDistrictCache()
    {
        List<SysDistrict> list = this.list();
        if (!CollectionUtils.isEmpty(list)) {
            SpringUtils.getBean(RedisCache.class).setCacheObject(CacheConstants.SYS_DISTRICT_LIST_KEY, list);
        }
        List<DistrictTreeRespDTO> treeRespDTOS = this.selectAllByTree();
        if (!CollectionUtils.isEmpty(treeRespDTOS)) {
            SpringUtils.getBean(RedisCache.class).setCacheObject(CacheConstants.SYS_DISTRICT_TREE_KEY, list);
        }
    }


    @Override
    public void clearDistrictCache()
    {
        if (SpringUtils.getBean(RedisCache.class).hasKey(CacheConstants.SYS_DISTRICT_LIST_KEY)){
            SpringUtils.getBean(RedisCache.class).deleteObject(CacheConstants.SYS_DISTRICT_LIST_KEY);
        }
        if (SpringUtils.getBean(RedisCache.class).hasKey(CacheConstants.SYS_DISTRICT_TREE_KEY)){
            SpringUtils.getBean(RedisCache.class).deleteObject(CacheConstants.SYS_DISTRICT_TREE_KEY);
        }
    }

    /**
     * 重置区划缓存数据
     */
    @Override
    public void resetDistrictCache()
    {
        clearDistrictCache();
        loadingDistrictCache();
    }

    @Override
    public List<DistrictTreeRespDTO> selectAllByTree() {
        if (SpringUtils.getBean(RedisCache.class).hasKey(CacheConstants.SYS_DISTRICT_TREE_KEY)){
            List<DistrictTreeRespDTO> sysDistrictTree = SpringUtils.getBean(RedisCache.class).getCacheObject(CacheConstants.SYS_DISTRICT_TREE_KEY);
            return sysDistrictTree;
        }
        List<SysDistrict> districts = this.selectAll();
        if (CollectionUtils.isEmpty(districts)){
            throw new BusinessException(this.getClass(), ResultConstants.SYSTEM_ERROR_DATABASE_FAIL,"区划信息获取失败");
        }
        //获取父节点，0表示父节点，让此次递归有个开头
        List<DistrictTreeRespDTO> collect = districts.stream()
                //父节点的id = 0，根据它开始进行实现。
                .filter(e -> e.getParentcode().equals("0"))
                .map(e ->{
                    DistrictTreeRespDTO dto = new DistrictTreeRespDTO();
                    BeanUtils.copyProperties(e,dto);
                    //将过滤之后的数据来进行方法调用，拿到他的所有的子节点信息并进行封装
                    dto.setChildren(getchildrens(dto, districts));
                    return dto;
                }).collect(Collectors.toList());
        SpringUtils.getBean(RedisCache.class).setCacheObject(CacheConstants.SYS_DISTRICT_TREE_KEY, collect);
        return collect;
    }

    private List<DistrictTreeRespDTO> getchildrens(DistrictTreeRespDTO root,List<SysDistrict> districts){
        //root为每次最新的传递过来的数据，也就是上面过滤之后的 e ；
        List<DistrictTreeRespDTO> collect = districts.stream()
                //根据传递过来的 e ,拿到他的id，来查询出他的子节点id 这里有个特点 e.id = 子节点的父节点id
                .filter(e -> Objects.equals(e.getParentcode(), root.getCode()))
                .map(e -> {
                    DistrictTreeRespDTO dto = new DistrictTreeRespDTO();
                    BeanUtils.copyProperties(e,dto);
                    dto.setChildren(getchildrens(dto, districts));
                    //递归找到他的子节点，直到找到最后一个子节点为止，饼进行封装。
                    return dto;
                }).collect(Collectors.toList());
        return collect;
    }

}