All files / src/domains/hr/attendance/policy attendance-policy.service.ts

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import {
  Injectable,
  NotFoundException,
  ConflictException,
} from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import {
  AttendancePolicy,
  AttendancePolicyAssignment,
  AttendancePolicyVersion,
} from '../schemas';
import {
  CreateAttendancePolicyDto,
  UpdateAttendancePolicyDto,
  AssignPolicyDto,
} from './dto/attendance-policy.dto';
 
@Injectable()
export class AttendancePolicyService {
  constructor(
    @InjectModel(AttendancePolicy.name)
    private policyModel: Model<AttendancePolicy>,
    @InjectModel(AttendancePolicyAssignment.name)
    private assignmentModel: Model<AttendancePolicyAssignment>,
    @InjectModel(AttendancePolicyVersion.name)
    private versionModel: Model<AttendancePolicyVersion>,
  ) {}
 
  async create(
    tenantId: string,
    createDto: CreateAttendancePolicyDto,
    userId: string,
  ) {
    const existing = await this.policyModel.findOne({
      tenantId,
      policyCode: createDto.policyCode,
    });
    if (existing) {
      throw new ConflictException(
        `Policy with code ${createDto.policyCode} already exists`,
      );
    }
 
    const created = new this.policyModel({
      ...createDto,
      tenantId,
      createdBy: userId,
    });
 
    const saved = await created.save();
 
    await this.versionModel.create({
      tenantId,
      policyId: saved._id,
      policyData: saved.toObject(),
      effectiveFrom: saved.effectiveFrom,
      createdBy: userId,
    });
 
    return saved;
  }
 
  async findAll(tenantId: string) {
    return this.policyModel.find({ tenantId }).exec();
  }
 
  async findOne(tenantId: string, id: string) {
    const policy = await this.policyModel.findOne({ _id: id, tenantId }).exec();
    if (!policy) {
      throw new NotFoundException(`Attendance Policy #${id} not found`);
    }
    return policy;
  }
 
  async update(
    tenantId: string,
    id: string,
    updateDto: UpdateAttendancePolicyDto,
    userId: string,
  ) {
    const policy = await this.findOne(tenantId, id);
 
    // Instead of directly updating, create a new version if it alters core logic
    const updated = await this.policyModel.findOneAndUpdate(
      { _id: id, tenantId },
      { $set: updateDto },
      { new: true },
    );
 
    if (!updated) {
      throw new NotFoundException(`Attendance Policy #${id} not found`);
    }
 
    await this.versionModel.create({
      tenantId,
      policyId: updated._id,
      policyData: updated.toObject(),
      effectiveFrom: updated.effectiveFrom,
      createdBy: userId,
    });
 
    return updated;
  }
 
  async assignPolicy(tenantId: string, id: string, assignDto: AssignPolicyDto) {
    await this.findOne(tenantId, id); // Ensure policy exists
 
    // Deactivate current active assignments for this target if necessary, or just upsert
    // For simplicity, we just create the new assignment record. Real logic might need overlap checking.
    const created = new this.assignmentModel({
      ...assignDto,
      tenantId,
      policyId: id,
    });
    return created.save();
  }
 
  async getAssignments(tenantId: string, id: string) {
    return this.assignmentModel.find({ tenantId, policyId: id }).exec();
  }
 
  async resolvePolicyForEmployee(
    tenantId: string,
    employeeId: string,
    criteria: {
      branchId?: string;
      departmentId?: string;
      designationId?: string;
      teamId?: string;
    } = {},
  ) {
    // Basic resolution hierarchy: Employee > Team > Designation > Department > Branch > Tenant
    const assignmentTypes = [
      { type: 'Employee', targetId: employeeId },
      { type: 'Team', targetId: criteria.teamId },
      { type: 'Designation', targetId: criteria.designationId },
      { type: 'Department', targetId: criteria.departmentId },
      { type: 'Branch', targetId: criteria.branchId },
      { type: 'Tenant', targetId: tenantId },
    ];
 
    for (const rule of assignmentTypes) {
      if (!rule.targetId) continue;
 
      const assignment = await this.assignmentModel
        .findOne({
          tenantId,
          assignmentType: rule.type,
          assignmentTargetId: rule.targetId,
        })
        .sort({ createdAt: -1 });
 
      if (assignment) {
        return this.policyModel
          .findOne({ _id: assignment.policyId, tenantId })
          .exec();
      }
    }
    return null; // or default policy
  }
}