All files / src/domains/hr/hierarchy hierarchy.service.ts

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import { Injectable, BadRequestException } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { Employee } from '../employee/schemas/employee.schema';
 
@Injectable()
export class HierarchyService {
  constructor(
    @InjectModel(Employee.name) private readonly employeeModel: Model<Employee>,
  ) {}
 
  /** Walk up the manager chain from a given employee */
  async getManagerChain(
    tenantId: string,
    employeeId: string,
    maxDepth = 15,
  ): Promise<any[]> {
    const chain: any[] = [];
    let currentId = employeeId;
 
    for (let depth = 0; depth < maxDepth; depth++) {
      const emp: any = await this.employeeModel
        .findOne({ tenantId, _id: currentId, deletedAt: null })
        .select(
          '_id firstName lastName displayName employeeCode reportingManagerId designationId departmentId',
        )
        .lean()
        .exec();
 
      if (!emp) break;
      chain.push(emp);
      if (!emp.reportingManagerId) break;
      if (chain.some((e: any) => e._id.toString() === emp.reportingManagerId)) {
        // Circular chain guard
        break;
      }
      currentId = emp.reportingManagerId;
    }
 
    return chain;
  }
 
  /** Get direct reports of an employee */
  async getDirectReports(tenantId: string, employeeId: string): Promise<any[]> {
    return this.employeeModel
      .find({
        tenantId,
        reportingManagerId: employeeId,
        deletedAt: null,
        employmentStatus: { $nin: ['terminated', 'archived'] },
      })
      .select(
        '_id firstName lastName displayName employeeCode designationId departmentId branchId employmentStatus',
      )
      .lean()
      .exec();
  }
 
  /** Get all subordinates recursively using $graphLookup */
  async getAllReports(tenantId: string, employeeId: string): Promise<any[]> {
    const result = await this.employeeModel.aggregate([
      {
        $match: {
          tenantId,
          _id: (this.employeeModel as any).schema.obj ? undefined : undefined,
        },
      },
      {
        $graphLookup: {
          from: 'employees',
          startWith: '$_id',
          connectFromField: '_id',
          connectToField: 'reportingManagerId',
          as: 'allReports',
          maxDepth: 10,
          restrictSearchWithMatch: { tenantId, deletedAt: null },
        },
      },
      { $match: { tenantId, employeeCode: employeeId } },
      { $project: { allReports: 1 } },
    ]);
    return result.length > 0 ? result[0].allReports : [];
  }
 
  /** Org chart: get manager hierarchy node for an employee */
  async getOrgChartNode(
    tenantId: string,
    employeeId: string,
    depth = 3,
  ): Promise<any> {
    const emp: any = await this.employeeModel
      .findOne({ tenantId, _id: employeeId, deletedAt: null })
      .select(
        '_id firstName lastName displayName employeeCode designationId departmentId branchId reportingManagerId profilePhotoFileId',
      )
      .lean()
      .exec();
 
    if (!emp) return null;
 
    if (depth > 0) {
      const directReports = await this.getDirectReports(tenantId, employeeId);
      emp.children = await Promise.all(
        directReports
          .slice(0, 20)
          .map((r: any) =>
            this.getOrgChartNode(tenantId, r._id.toString(), depth - 1),
          ),
      );
    }
 
    return emp;
  }
 
  /** Full org chart rooted at employees with no manager */
  async getFullOrgChart(tenantId: string): Promise<any[]> {
    const roots: any[] = await this.employeeModel
      .find({
        tenantId,
        deletedAt: null,
        employmentStatus: { $in: ['active', 'probation', 'confirmed'] },
        $or: [
          { reportingManagerId: null },
          { reportingManagerId: { $exists: false } },
        ],
      })
      .select(
        '_id firstName lastName displayName employeeCode designationId departmentId branchId',
      )
      .lean()
      .exec();
 
    return Promise.all(
      roots.map((r: any) =>
        this.getOrgChartNode(tenantId, r._id.toString(), 3),
      ),
    );
  }
}