@votemike/property/dist/src/finance.js

Property class and related classes

import { round } from './helpers';
import Fee from './fee';
export default class Finance {
    constructor(amount, repayment, length, rate, fees, teaserRate) {
        this.amount = amount;
        this.repayment = repayment;
        this.length = length;
        this.rate = rate;
        this.fees = fees;
        this.teaserRate = teaserRate;
    }
    get totalCostOfFinance() {
        return round(this.calculateTotalCostOfFinance());
    }
    get totalOneOffCosts() {
        return this.fees.reduce((total, fee) => fee.amount + total, 0);
    }
    get monthlyCostOfFinance() {
        return round(this.calculateMonthlyCostOfFinance(this.rate));
    }
    get monthlyTeaserCostOfFinance() {
        var _a;
        return round(this.calculateMonthlyCostOfFinance((_a = this.teaserRate) !== null && _a !== void 0 ? _a : this.rate));
    }
    get yearlyCostOfFinance() {
        return round(this.calculateYearlyCostOfFinance(this.rate));
    }
    get yearlyTeaserOfFinance() {
        var _a;
        return round(this.calculateYearlyCostOfFinance((_a = this.teaserRate) !== null && _a !== void 0 ? _a : this.rate));
    }
    calculateTotalCostOfFinance() {
        const feeCosts = this.fees.reduce((total, fee) => fee.amount + total, 0);
        if (this.repayment) {
            return this.calculateYearlyCostOfFinance(this.rate) * this.length + feeCosts;
        }
        return this.amount + this.calculateYearlyCostOfFinance(this.rate) * this.length + feeCosts;
    }
    calculateYearlyCostOfFinance(rate) {
        return this.calculateMonthlyCostOfFinance(rate) * 12;
    }
    calculateMonthlyCostOfFinance(rate) {
        const monthlyInterestRate = rate / 12 / 100;
        if (!this.repayment) {
            return this.amount * monthlyInterestRate;
        }
        const monthsLeft = this.length * 12;
        // M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1]
        const pow = Math.pow((monthlyInterestRate + 1), monthsLeft);
        return this.amount * ((monthlyInterestRate * pow) / (pow - 1));
    }
    static fromJson(json) {
        const finance = Object.create(Finance.prototype);
        return Object.assign(finance, json, {
            fees: json.fees.map((feeObject) => {
                return Fee.fromJson(feeObject);
            })
        });
    }
}