// report.js
// Copyright (C) 2024 DTP Technologies, LLC
// All Rights Reserved

'use strict';

import mongoose from 'mongoose';
const TaskSession = mongoose.model('TaskSession');

import dayjs from 'dayjs';

import { SiteService } from '../../lib/site-lib.js';

export default class ReportService extends SiteService {

  static get name ( ) { return 'ReportService'; }
  static get slug () { return 'report'; }

  constructor (dtp) {
    super(dtp, ReportService);
  }

  async getWeeklyEarnings (user) {
    const NOW = new Date();
    const dateStart = this.startOfWeek(NOW);
    const dateEnd = dayjs(dateStart).add(1, 'week').toDate();

    this.log.debug('computing weekly earnings', { dateStart, dateEnd });

    /*
     * I'm sure there's some beautiful way to do this using aggregation but I
     * don't care at all (and won't) until aggregation becomes a usable API.
     */
    const response = { sessionCount: 0, duration: 0, billable: 0 };
    await TaskSession
      .find({
        user: user._id,
        $and: [
          { created: { $gte: dateStart } },
          { finished: { $lt: dateEnd } },
        ],
      })
      .cursor()
      .eachAsync(async (session) => {
        response.sessionCount += 1;
        response.duration += session.duration;
        response.billable += session.hourlyRate * (session.duration / 60 / 60);
      });

    return response;
  }

  startOfWeek (date) {
    date = date || new Date();
    date.setHours(0,0,0,0);

    var diff = date.getDate() - date.getDay() + (date.getDay() === 0 ? -6 : 1);
    return new Date(date.setDate(diff));
  }  
}