All files / src/domains/hr/organization department.service.ts

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import {
  Injectable,
  NotFoundException,
  BadRequestException,
  ConflictException,
} from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { Department } from './schemas/department.schema';
import { AuditLogService } from '../../../platform/audit/audit-log.service';
import { EventBusService } from '../../../platform/events/event-bus.service';
 
@Injectable()
export class DepartmentService {
  constructor(
    @InjectModel(Department.name)
    private readonly departmentModel: Model<Department>,
    private readonly auditLog: AuditLogService,
    private readonly eventBus: EventBusService,
  ) {}
 
  async create(tenantId: string, data: any, userId: string) {
    const existing = await this.departmentModel
      .findOne({ tenantId, departmentCode: data.departmentCode })
      .exec();
    if (existing)
      throw new ConflictException(
        `Department code ${data.departmentCode} already exists.`,
      );
 
    if (data.parentDepartmentId) {
      const parent = await this.departmentModel
        .findOne({ tenantId, _id: data.parentDepartmentId })
        .exec();
      if (!parent)
        throw new BadRequestException(
          'Parent department not found in this tenant.',
        );
      // Circular hierarchy check
      await this.validateNoCycle(tenantId, data.parentDepartmentId, null);
    }
 
    const dept = await this.departmentModel.create({
      ...data,
      tenantId,
      createdBy: userId,
    });
 
    await this.auditLog.log({
      tenantId,
      userId,
      action: 'CREATE',
      resource: 'Department',
      resourceId: dept.id,
      newValues: data,
      moduleName: 'HR',
    });
    await this.eventBus.publish(
      'hr.department.created.v1',
      { tenantId, departmentId: dept.id },
      tenantId,
    );
    return dept;
  }
 
  async findAll(tenantId: string) {
    return this.departmentModel
      .find({ tenantId, deletedAt: null })
      .sort({ departmentName: 1 })
      .lean()
      .exec();
  }
 
  async findOne(tenantId: string, id: string) {
    const dept = await this.departmentModel
      .findOne({ tenantId, _id: id, deletedAt: null })
      .lean()
      .exec();
    if (!dept) throw new NotFoundException('Department not found');
    return dept;
  }
 
  async update(tenantId: string, id: string, data: any, userId: string) {
    const dept = await this.departmentModel
      .findOne({ tenantId, _id: id, deletedAt: null })
      .exec();
    if (!dept) throw new NotFoundException('Department not found');
 
    if (data.parentDepartmentId) {
      if (data.parentDepartmentId === id)
        throw new BadRequestException('Department cannot be its own parent.');
      await this.validateNoCycle(tenantId, data.parentDepartmentId, id);
    }
 
    const oldValues = dept.toObject();
    Object.assign(dept, data, { updatedBy: userId });
    await dept.save();
 
    await this.auditLog.log({
      tenantId,
      userId,
      action: 'UPDATE',
      resource: 'Department',
      resourceId: dept.id,
      oldValues,
      newValues: data,
      moduleName: 'HR',
    });
    await this.eventBus.publish(
      'hr.department.updated.v1',
      { tenantId, departmentId: dept.id },
      tenantId,
    );
    return dept;
  }
 
  async getTree(tenantId: string) {
    const departments = await this.findAll(tenantId);
    const tree: any[] = [];
    const lookup = new Map<string, any>();
 
    departments.forEach((dept: any) => {
      lookup.set(dept._id.toString(), { ...dept, children: [] });
    });
 
    departments.forEach((dept: any) => {
      const node = lookup.get(dept._id.toString());
      if (dept.parentDepartmentId && lookup.has(dept.parentDepartmentId)) {
        lookup.get(dept.parentDepartmentId).children.push(node);
      } else {
        tree.push(node);
      }
    });
 
    return tree;
  }
 
  /** Walk up the parent chain to ensure no cycle would be created */
  private async validateNoCycle(
    tenantId: string,
    parentId: string,
    selfId: string | null,
    depth = 0,
  ) {
    if (depth > 20)
      throw new BadRequestException('Department hierarchy too deep.');
    if (parentId === selfId)
      throw new BadRequestException('Circular department hierarchy detected.');
    const parent = await this.departmentModel
      .findOne({ tenantId, _id: parentId })
      .lean()
      .exec();
    if (parent && (parent as any).parentDepartmentId) {
      await this.validateNoCycle(
        tenantId,
        (parent as any).parentDepartmentId,
        selfId,
        depth + 1,
      );
    }
  }
}