All files / src/domains/hr/leave/period leave-period.service.ts

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import {
  Injectable,
  NotFoundException,
  BadRequestException,
} from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import {
  LeavePeriod,
  LeavePeriodSegment,
  EmployeeLeavePeriodAssignment,
} from '../schemas';
 
@Injectable()
export class LeavePeriodService {
  constructor(
    @InjectModel(LeavePeriod.name) private periodModel: Model<LeavePeriod>,
    @InjectModel(LeavePeriodSegment.name)
    private segmentModel: Model<LeavePeriodSegment>,
    @InjectModel(EmployeeLeavePeriodAssignment.name)
    private empAssignModel: Model<EmployeeLeavePeriodAssignment>,
  ) {}
 
  async create(tenantId: string, dto: any, userId: string) {
    const period = await this.periodModel.create({
      ...dto,
      tenantId,
      createdBy: userId,
      status: 'draft',
    });
    // Auto-generate monthly segments
    await this.generateSegments(
      tenantId,
      period._id.toString(),
      dto.startDate,
      dto.endDate,
    );
    return period;
  }
 
  private async generateSegments(
    tenantId: string,
    periodId: string,
    startDate: string,
    endDate: string,
  ) {
    const segments = [];
    const start = new Date(startDate);
    const end = new Date(endDate);
    const current = new Date(start);
 
    while (current <= end) {
      const segStart = `${current.getFullYear()}-${String(current.getMonth() + 1).padStart(2, '0')}-01`;
      const segEnd = new Date(current.getFullYear(), current.getMonth() + 1, 0)
        .toISOString()
        .split('T')[0];
      segments.push({
        tenantId,
        periodId,
        segmentName: current.toLocaleString('default', {
          month: 'long',
          year: 'numeric',
        }),
        startDate: segStart,
        endDate: segEnd > endDate ? endDate : segEnd,
        segmentType: 'Monthly',
      });
      current.setMonth(current.getMonth() + 1);
    }
    await this.segmentModel.insertMany(segments);
  }
 
  async findAll(tenantId: string, status?: string) {
    const filter: any = { tenantId };
    if (status) filter.status = status;
    return this.periodModel.find(filter).sort({ startDate: -1 }).exec();
  }
 
  async findOne(tenantId: string, id: string) {
    const doc = await this.periodModel.findOne({ _id: id, tenantId }).exec();
    if (!doc) throw new NotFoundException('Leave period not found');
    return doc;
  }
 
  async update(tenantId: string, id: string, dto: any) {
    const doc = await this.findOne(tenantId, id);
    if (doc.status === 'closed')
      throw new BadRequestException('Closed periods cannot be edited');
    Object.assign(doc, dto);
    return doc.save();
  }
 
  async close(tenantId: string, id: string, userId: string) {
    const doc = await this.findOne(tenantId, id);
    if (doc.status === 'closed')
      throw new BadRequestException('Period already closed');
    doc.status = 'closed';
    doc.closedAt = new Date();
    doc.closedBy = userId;
    return doc.save();
  }
 
  async reopen(tenantId: string, id: string) {
    return this.periodModel.findOneAndUpdate(
      { _id: id, tenantId },
      { $set: { status: 'active', closedAt: null } },
      { new: true },
    );
  }
 
  async getSegments(tenantId: string, periodId: string) {
    return this.segmentModel
      .find({ tenantId, periodId })
      .sort({ startDate: 1 })
      .exec();
  }
 
  async assignEmployee(tenantId: string, dto: any) {
    return this.empAssignModel.findOneAndUpdate(
      { tenantId, employeeId: dto.employeeId, periodId: dto.periodId },
      {
        $set: {
          status: 'active',
          effectiveFrom: dto.effectiveFrom || new Date(),
        },
      },
      { upsert: true, new: true },
    );
  }
 
  /** Find the active leave period for an employee on a given date */
  async resolveActivePeriod(tenantId: string, date: string) {
    return this.periodModel
      .findOne({
        tenantId,
        status: 'active',
        startDate: { $lte: date },
        endDate: { $gte: date },
      })
      .exec();
  }
}