package com.waterquality.projectmanagement.service;

import com.waterquality.projectmanagement.dto.DepartmentDTO;
import com.waterquality.projectmanagement.entity.department.Department;
import com.waterquality.projectmanagement.entity.employee.Employee;
import com.waterquality.projectmanagement.exception.ResourceNotFoundException;
import com.waterquality.projectmanagement.repository.DepartmentRepository;
import com.waterquality.projectmanagement.repository.EmployeeRepository;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.Optional;

@Service
@RequiredArgsConstructor
public class DepartmentService {

    private final DepartmentRepository departmentRepository;
    private final EmployeeRepository employeeRepository;

    @Transactional
    public Department createWithParent(DepartmentDTO dto) {
        Department parent = dto.getParentId() != null ?
                departmentRepository.findById(dto.getParentId())
                        .orElseThrow(() -> new ResourceNotFoundException("父部门不存在")) :
                null;

        Employee manager = dto.getManagerId() != null ?
                employeeRepository.findById(dto.getManagerId())
                        .orElseThrow(() -> new ResourceNotFoundException("负责人不存在")) :
                null;

        Department dept = new Department();
        dept.setDepartmentName(dto.getName());
        dept.setParent(parent);
        dept.setManager(manager);
        dept.setArea(dto.getArea());
        return departmentRepository.save(dept);
    }

    public String getDepartmentNameById(Integer id) {
        return departmentRepository.findById(id)
                .map(Department::getDepartmentName)
                .orElseThrow(() -> new ResourceNotFoundException("部门不存在"));
    }
    public List<Department> getAllDepartment() {
        return departmentRepository.findAll();
    }

    public Department getDepartmentDetailsById(Integer id) {
        return departmentRepository.findById(id)
                .orElseThrow(() -> new ResourceNotFoundException("部门不存在"));
    }
}