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

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import { Injectable } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { Employee } from '../employee/schemas/employee.schema';
import { EmployeeEmploymentHistory } from '../employee/schemas/employee-history.schema';
import { Cron, CronExpression } from '@nestjs/schedule';
 
@Injectable()
export class HrDashboardService {
  constructor(
    @InjectModel(Employee.name) private readonly employeeModel: Model<Employee>,
    @InjectModel(EmployeeEmploymentHistory.name)
    private readonly empHistModel: Model<EmployeeEmploymentHistory>,
  ) {}
 
  async getSummary(tenantId: string) {
    const [
      total,
      active,
      probation,
      notice,
      suspended,
      draft,
      invited,
      onboarding,
    ] = await Promise.all([
      this.employeeModel.countDocuments({ tenantId, deletedAt: null }),
      this.employeeModel.countDocuments({
        tenantId,
        employmentStatus: 'active',
      }),
      this.employeeModel.countDocuments({
        tenantId,
        employmentStatus: 'probation',
      }),
      this.employeeModel.countDocuments({
        tenantId,
        employmentStatus: 'notice_period',
      }),
      this.employeeModel.countDocuments({
        tenantId,
        employmentStatus: 'suspended',
      }),
      this.employeeModel.countDocuments({
        tenantId,
        employmentStatus: 'draft',
      }),
      this.employeeModel.countDocuments({
        tenantId,
        employmentStatus: 'invited',
      }),
      this.employeeModel.countDocuments({
        tenantId,
        employmentStatus: 'onboarding',
      }),
    ]);
 
    return {
      total,
      active,
      probation,
      notice,
      suspended,
      draft,
      invited,
      onboarding,
    };
  }
 
  async getHeadcountByBranch(tenantId: string) {
    return this.employeeModel.aggregate([
      {
        $match: {
          tenantId,
          deletedAt: null,
          employmentStatus: { $in: ['active', 'probation', 'confirmed'] },
        },
      },
      { $group: { _id: '$branchId', count: { $sum: 1 } } },
      { $sort: { count: -1 } },
    ]);
  }
 
  async getHeadcountByDepartment(tenantId: string) {
    return this.employeeModel.aggregate([
      {
        $match: {
          tenantId,
          deletedAt: null,
          employmentStatus: { $in: ['active', 'probation', 'confirmed'] },
        },
      },
      { $group: { _id: '$departmentId', count: { $sum: 1 } } },
      { $sort: { count: -1 } },
    ]);
  }
 
  async getEmploymentTypeDistribution(tenantId: string) {
    return this.employeeModel.aggregate([
      {
        $match: {
          tenantId,
          deletedAt: null,
          employmentStatus: { $in: ['active', 'probation', 'confirmed'] },
        },
      },
      { $group: { _id: '$employmentType', count: { $sum: 1 } } },
    ]);
  }
 
  async getNewJoiners(tenantId: string, days = 30) {
    const since = new Date();
    since.setDate(since.getDate() - days);
    return this.employeeModel
      .find({ tenantId, joiningDate: { $gte: since }, deletedAt: null })
      .select(
        'firstName lastName displayName employeeCode designationId branchId joiningDate',
      )
      .sort({ joiningDate: -1 })
      .limit(50)
      .lean()
      .exec();
  }
 
  async getUpcomingConfirmations(tenantId: string, days = 30) {
    const now = new Date();
    const until = new Date();
    until.setDate(until.getDate() + days);
    return this.employeeModel
      .find({
        tenantId,
        employmentStatus: 'probation',
        probationEndDate: { $gte: now, $lte: until },
        deletedAt: null,
      })
      .select(
        'firstName lastName displayName employeeCode designationId probationEndDate',
      )
      .sort({ probationEndDate: 1 })
      .limit(50)
      .lean()
      .exec();
  }
 
  async getRecentActivity(tenantId: string) {
    return this.empHistModel
      .find({ tenantId })
      .sort({ createdAt: -1 })
      .limit(20)
      .lean()
      .exec();
  }
 
  async getStatusDistribution(tenantId: string) {
    return this.employeeModel.aggregate([
      { $match: { tenantId, deletedAt: null } },
      { $group: { _id: '$employmentStatus', count: { $sum: 1 } } },
      { $sort: { count: -1 } },
    ]);
  }
 
  async getHeadcountTrend(tenantId: string, months = 12) {
    const since = new Date();
    since.setMonth(since.getMonth() - months);
    return this.employeeModel.aggregate([
      { $match: { tenantId, joiningDate: { $gte: since }, deletedAt: null } },
      {
        $group: {
          _id: {
            year: { $year: '$joiningDate' },
            month: { $month: '$joiningDate' },
          },
          joiners: { $sum: 1 },
        },
      },
      { $sort: { '_id.year': 1, '_id.month': 1 } },
    ]);
  }
}