All files / src/domains/hr/leave/conflict conflict.service.ts

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import { Injectable } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import {
  LeaveConflictRule,
  LeaveConflictResult,
  StaffingThreshold,
  LeaveRequest,
} from '../schemas';
 
@Injectable()
export class ConflictDetectionService {
  constructor(
    @InjectModel(LeaveConflictRule.name)
    private ruleModel: Model<LeaveConflictRule>,
    @InjectModel(LeaveConflictResult.name)
    private resultModel: Model<LeaveConflictResult>,
    @InjectModel(StaffingThreshold.name)
    private thresholdModel: Model<StaffingThreshold>,
    @InjectModel(LeaveRequest.name) private requestModel: Model<LeaveRequest>,
  ) {}
 
  async detectConflicts(
    tenantId: string,
    employeeId: string,
    startDate: string,
    endDate: string,
    leaveRequestId: string,
  ): Promise<any[]> {
    const conflicts: any[] = [];
 
    // 1. Blackout Periods check
    const thresholds = await this.thresholdModel
      .find({
        tenantId,
        status: 'active',
        blackoutStartDate: { $lte: endDate },
        blackoutEndDate: { $gte: startDate },
      })
      .exec();
 
    for (const t of thresholds) {
      conflicts.push({
        ruleType: 'BlackoutPeriod',
        severity: 'Block',
        message: `Requested dates fall within the blackout period: ${t.name}`,
        details: { thresholdId: t._id },
      });
    }
 
    // 2. Team Capacity check (simulated based on overlapping requests)
    const activeLeaves = await this.requestModel
      .find({
        tenantId,
        status: { $in: ['approved', 'pending_approval'] },
        startDate: { $lte: endDate },
        endDate: { $gte: startDate },
        employeeId: { $ne: employeeId },
      })
      .exec();
 
    if (activeLeaves.length >= 3) {
      conflicts.push({
        ruleType: 'TeamCapacity',
        severity: 'Warning',
        message: `High number of team members on leave during this period (${activeLeaves.length} employees)`,
        details: { count: activeLeaves.length },
      });
    }
 
    // Save results if a leaveRequestId was provided
    if (leaveRequestId && conflicts.length > 0) {
      await this.resultModel.deleteMany({ tenantId, leaveRequestId });
      await this.resultModel.insertMany(
        conflicts.map((c) => ({
          ...c,
          tenantId,
          leaveRequestId,
          status: 'active',
        })),
      );
    }
 
    return conflicts;
  }
}