// 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 { client: clientService } = this.dtp.services;
    const NOW = new Date();

    const dateStart = this.startOfWeek(NOW);
    const dateEnd = dayjs(dateStart).add(1, 'week').toDate();

    const data = await TaskSession.aggregate([
      {
        $match: {
          user: user._id,
          $and: [
            { created: { $gte: dateStart } },
            { finished: { $lt: dateEnd } },
          ],
        },
      },
      {
        $group: {
          _id: { project: '$project' },
          sessionCount: { $sum: 1 },
          duration: { $sum: '$duration' },
          billable: {
            $sum: {
              $multiply: [
                '$hourlyRate',
                { $divide: ['$duration', 3600 ] },
              ],
            },
          },
        },
      },
      {
        $project: {
          _id: 0,
          project: '$_id.project',
          sessionCount: '$sessionCount',
          duration: '$duration',
          billable: '$billable',
        },
      },
    ]);

    const response = await TaskSession.populate(data, [
      {
        path: 'project',
        populate: clientService.populateClientProject,
      },
    ]);

    return response;
  }

  async getDailyHoursWorkedForUser (user) {
    const NOW = new Date();

    const dateStart = this.startOfWeek(NOW);
    const dateEnd = dayjs(dateStart).add(1, 'week').toDate();

    const response = await TaskSession.aggregate([
      {
        $match: {
          $and: [
            { user: user._id },
            { finished: { $gt: dateStart } },
            { created: { $lt: dateEnd } },
          ],
        }
      },
      {
        $group: {
          _id: {
            year: { $year: '$created' },
            month: { $month: '$created' },
            day: { $dayOfMonth: '$created' },
          },
          workSessionCount: { $sum: 1 },
          timeWorked: { $sum: '$duration' },
        },
      },
      {
        $project: {
          _id: false,
          date: {
            $dateFromParts: {
              year: '$_id.year',
              month: '$_id.month',
              day: '$_id.day',
            },
          },
          workSessionCount: '$workSessionCount',
          hoursWorked: { $divide: ['$timeWorked', 3600] },
        },
      },
    ]);

    if (response.length < 7) {
      let currentDay = dayjs(dateStart).add(response.length, 'day');
      while (response.length < 7) {
        response.push({
          date: currentDay,
          workSessionCount: 0,
          hoursWorked: 0,
        });
        currentDay = dayjs(currentDay).add(1, 'day');
      }
    }

    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));
  }  
}