calculate.js

import {Dates} from './dates';
import {RatesService} from '../pages/rates/rates.service';
import {TransactionsService} from '../pages/transactions/transactions.service';
import * as _ from 'lodash';

export class Calculate {
  constructor() {
    this.dates = new Dates();
    this.ratesService = new RatesService();
    this.transactionsService = new TransactionsService();
  }

  today(date = new Date()) {
    let d = this.dates.createDate(date);
    return this.sumRange([d,d]);
  }

  week(date = new Date()) {
    var w = this.dates.startAndEndOfWeek(date);
    return this.sumRange(w);
  }

  month(date = new Date()) {
    let m = this.dates.startAndEndOfMonth(date);
    return this.sumRange(m);
  }

  year(date = new Date()) {
    let y = this.dates.startAndEndOfYear(date);
    return this.sumRange(y);
  }

  sumRange(range) {
    return this.ratesService.calculateDailyRate().then(dailyRate => {
      return this.transactionsService.range(range).then(all => {
        let totalIn = _.chain(all).filter({direction: 'In'}).map('amount').sum().value();
        let totalOut = _.chain(all).filter({direction: 'Out'}).map('amount').sum().value();
        let totalDailyRate = this.dates.numberOfDaysInRange(range) * dailyRate;
        return (totalDailyRate + totalIn) - totalOut;
      });
    });
  }
}