package cn.iocoder.yudao.module.hrm.api.employee;

import cn.iocoder.yudao.framework.common.util.object.BeanUtils;
import cn.iocoder.yudao.module.hrm.api.employee.dto.HrmEmployeeSimpleDTO;
import cn.iocoder.yudao.module.hrm.dal.dataobject.employee.HrmEmployeeDO;
import cn.iocoder.yudao.module.hrm.dal.mysql.employee.HrmEmployeeMapper;
import cn.iocoder.yudao.module.system.api.dept.DeptApi;
import cn.iocoder.yudao.module.system.api.dept.dto.DeptRespDTO;
import jakarta.annotation.Resource;
import org.springframework.stereotype.Service;

import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Objects;

/**
 * 员工档案 API 实现类
 *
 * @author 超级管理员
 */
@Service
public class HrmEmployeeApiImpl implements HrmEmployeeApi {

    @Resource
    private HrmEmployeeMapper employeeMapper;
    @Resource
    private DeptApi deptApi;

    @Override
    public HrmEmployeeSimpleDTO getEmployee(Long id) {
        if (id == null) {
            return null;
        }
        HrmEmployeeDO employee = employeeMapper.selectById(id);
        if (employee == null) {
            return null;
        }
        return build(employee, getDeptName(employee.getDeptId()));
    }

    @Override
    public List<HrmEmployeeSimpleDTO> getEmployeeList(Collection<Long> ids) {
        if (ids == null || ids.isEmpty()) {
            return List.of();
        }
        List<HrmEmployeeDO> employees = employeeMapper.selectBatchIds(ids);
        if (employees.isEmpty()) {
            return List.of();
        }
        // 批量查部门，避免 N+1
        List<Long> deptIds = employees.stream().map(HrmEmployeeDO::getDeptId)
                .filter(Objects::nonNull).distinct().toList();
        Map<Long, DeptRespDTO> deptMap = deptIds.isEmpty() ? Map.of() : deptApi.getDeptMap(deptIds);
        return employees.stream()
                .map(e -> {
                    DeptRespDTO dept = deptMap.get(e.getDeptId());
                    return build(e, dept == null ? null : dept.getName());
                })
                .toList();
    }

    @Override
    public boolean validateEmployeeExists(Long id) {
        return id != null && employeeMapper.selectById(id) != null;
    }

    private String getDeptName(Long deptId) {
        if (deptId == null) {
            return null;
        }
        DeptRespDTO dept = deptApi.getDept(deptId);
        return dept == null ? null : dept.getName();
    }

    private static HrmEmployeeSimpleDTO build(HrmEmployeeDO employee, String deptName) {
        HrmEmployeeSimpleDTO dto = BeanUtils.toBean(employee, HrmEmployeeSimpleDTO.class);
        dto.setDeptName(deptName);
        return dto;
    }

}