fairnesscoop / permacoop

import { Inject } from '@nestjs/common';

import { QueryHandler } from '@nestjs/cqrs';

import { GetLeaveRequestsOverviewQuery } from './GetLeaveRequestsOverviewQuery';

import { ILeaveRequestsOverview } from 'src/Domain/HumanResource/Leave/ILeaveRequestsOverview';

import { IDateUtils } from 'src/Application/IDateUtils';

import { ILeaveRepository } from 'src/Domain/HumanResource/Leave/Repository/ILeaveRepository';

@QueryHandler(GetLeaveRequestsOverviewQuery)

export class GetLeaveRequestsOverviewQueryHandler {

  constructor(

    @Inject('IDateUtils')

    private readonly dateUtils: IDateUtils,

    @Inject('ILeaveRepository')

    private readonly leaveRepository: ILeaveRepository

  ) {}

  public async execute(

    query: GetLeaveRequestsOverviewQuery

  ): Promise<ILeaveRequestsOverview> {

    const [startDate, endDate] = this.dateUtils.getLeaveReferencePeriodDays(

      query.date

    );

    const numDaysPerWeek = this.dateUtils.getWorkedDaysPerWeek();

    const numWeeks = this.dateUtils.getNumberOfPaidLeaveWeeks();

    const daysPerYear = numWeeks * numDaysPerWeek;

    const totalDurationTaken = await this.leaveRepository.getSumOfDurationsBetween(

      startDate,

      endDate,

      query.user

    );

    const daysTaken = this.dateUtils.getLeaveDurationAsDays(totalDurationTaken);

    const daysRemaining = daysPerYear - daysTaken;

    return {

      daysPerYear,

      daysTaken,

      daysRemaining

    };

  }

}