package com.yuanchu.mom.service.impl;

import com.baomidou.mybatisplus.core.toolkit.ObjectUtils;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.yuanchu.mom.dto.DepartmentDto;
import com.yuanchu.mom.pojo.Department;
import com.yuanchu.mom.mapper.DepartmentMapper;
import com.yuanchu.mom.service.DepartmentService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import lombok.AllArgsConstructor;
import lombok.var;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Wrapper;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * <p>
 * 部门明细 服务实现类
 * </p>
 *
 * @author 江苏鵷雏网络科技有限公司
 * @since 2024-04-15 04:01:48
 */
@Service
@AllArgsConstructor
@Transactional(rollbackFor = Exception.class)
public class DepartmentServiceImpl extends ServiceImpl<DepartmentMapper, Department> implements DepartmentService {

    DepartmentMapper departmentMapper;


    //添加部门
    @Override
    public int addDepartment(Department department) {
        departmentMapper.insert(department);
        return department.getId();
    }

    //获取部门树
    @Override
    public List<DepartmentDto> selectDepartment() {
        List<Department> departments = departmentMapper.selectDepartment();
        // 假设 resultSet 是从数据库查询返回的结果集
        List<DepartmentDto> departmentDtos = new ArrayList<>();
        Map<Integer, DepartmentDto> departmentMap = new HashMap<>();

        for (Department department : departments) {
            DepartmentDto departmentDto = new DepartmentDto(department.getId(), department.getName(), department.getFatherId(), new ArrayList<DepartmentDto>());
            departmentMap.put(department.getId(), departmentDto);
            if (department.getFatherId() == null) {
                // 根部门
                departmentDtos.add(departmentDto);
            } else {
                // 将当前部门添加到父部门的 children 列表中
                DepartmentDto parent = departmentMap.get(department.getFatherId());
                if (parent != null) {
                    parent.getChildren().add(departmentDto);
                }
            }
        }
        return departmentDtos;
    }

    //删除部门
    @Override
    public boolean delDepartment(Integer id) {
        //判断是否有子类,直到没有为止
        List<Department> department = getDepartment(id);
        return removeBatchByIds(department);
    }


    //判断是否有子类,直到没有为止
    public List<Department> getDepartment(Integer id){
        List<Department> list = new ArrayList<>();
        Department depart = baseMapper.selectById(id);
        list.add(depart);
        List<Department> departments = baseMapper.selectList(Wrappers.<Department>lambdaQuery().eq(Department::getFatherId, id));
        if (ObjectUtils.isNotEmpty(departments)){
            list.addAll(departments);
            for (Department department : departments){
                list.addAll(getDepartment(department.getId()));
            }
        }
        return list;
    }

}