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index.js
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index.js
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const ERRORS = {
INVALID_INPUT:
"Um ou mais valores estão inválidos. Insira valores válidos para realizar o cálculo corretamente.",
VALUES_NOT_DECLARED:
"Nenhum valor foi informado, preencha os campos corretamente.",
};
class Validator {
static validate(valuesObject) {
if (valuesObject.length === 0) {
throw new Error(ERRORS.VALUES_NOT_DECLARED);
}
const newValuesObject = {};
const valuesArray = Object.entries(valuesObject);
const isInvalid = valuesArray.some((value) => {
const floatValue = parseFloat(
value[1].replace(/\./g, "").replace(/,/g, "")
);
const isNaN = Number.isNaN(floatValue);
const isNegative = Number(floatValue) < 0;
return isNaN || isNegative;
});
if (isInvalid) throw new Error(ERRORS.INVALID_INPUT);
valuesArray.forEach((valueEntry) => {
return (newValuesObject[valueEntry[0]] = valueEntry[1]
.replace(/\./g, "")
.replace(/,/g, "."));
});
return newValuesObject;
}
}
class Formmater {
static format(valuesObject) {
const newValuesObject = {};
const valuesArray = Object.entries(valuesObject);
const formmatedValues = valuesArray.map((value) => {
return parseFloat(String(value[1]).replace(",", "."));
});
valuesArray.forEach((valueEntry, index) => {
return (newValuesObject[valueEntry[0]] = formmatedValues[index]);
});
return newValuesObject;
}
static transformToReal(value) {
return Intl.NumberFormat("pt-br", {
currency: "brl",
style: "currency",
maximumFractionDigits: 2,
minimumFractionDigits: 2,
}).format(value);
}
static monthToYearPercentage(yearlyPercentage) {
return ((Math.pow(yearlyPercentage / 100 + 1, 1 / 12) - 1) * 100).toFixed(
2
);
}
static yearToMonthPercentage(monthlyPercentage) {
return ((Math.pow(1 + monthlyPercentage / 100, 12) - 1) * 100).toFixed(2);
}
}
class CompoundInterestsCalculator {
constructor({ resultsInterval, ...compoundInterestNecessaryValues }) {
if (resultsInterval === "invalid") {
alert(ERRORS.INVALID_INPUT);
throw new Error(ERRORS.INVALID_INPUT);
}
this.valuesObject = compoundInterestNecessaryValues;
this.resultsInterval = resultsInterval;
this.total = {
totalResult: 0,
totalInvested: 0,
totalInterests: 0,
};
this.#populateValuesObject();
}
#populateValuesObject() {
try {
const validatedValues = Validator.validate(this.valuesObject);
const {
initialValue,
interestRate,
growthRate,
capitalInjection,
totalPeriod,
} = Formmater.format(validatedValues);
this.initialValue = initialValue;
this.interestRate =
this.resultsInterval === "yearly"
? Formmater.monthToYearPercentage(interestRate) / 100
: interestRate / 100;
this.growthRate = growthRate / 100;
this.capitalInjection = capitalInjection;
this.totalPeriod =
this.resultsInterval === "yearly" ? totalPeriod * 12 : totalPeriod;
} catch (error) {
alert(error.message);
}
}
calculate() {
let value = this.initialValue;
let totalInvested = value;
for (let i = 1; i <= this.totalPeriod; i++) {
const rate =
this.resultsInterval === "monthly"
? this.interestRate / 100
: this.interestRate;
const interest = 1 + rate;
const valueWithInterest = value * interest;
value = valueWithInterest + this.capitalInjection;
totalInvested = totalInvested + this.capitalInjection;
if (i % 12 === 0 && i > 0) {
this.capitalInjection =
this.capitalInjection + this.capitalInjection * this.growthRate;
}
if (i == this.totalPeriod) {
this.total.totalInterests = Formmater.transformToReal(
value - totalInvested
);
this.total.totalInvested = Formmater.transformToReal(totalInvested);
this.total.totalResult = Formmater.transformToReal(value);
}
}
}
}
class EventCreator {
constructor({
initialValueInput,
interestRateInput,
growthRateInput,
capitalInjectionInput,
totalPeriodInput,
cleanButton,
calculateButton,
resultsInterval,
totalInterests,
totalInvested,
totalResult,
}) {
this.initialValueInput = initialValueInput;
this.interestRateInput = interestRateInput;
this.growthRateInput = growthRateInput;
this.capitalInjectionInput = capitalInjectionInput;
this.totalPeriodInput = totalPeriodInput;
this.cleanButton = cleanButton;
this.calculateButton = calculateButton;
this.resultsInterval = resultsInterval;
this.totalInterests = totalInterests;
this.totalInvested = totalInvested;
this.totalResult = totalResult;
this.firstResultIntervalChange = true;
}
start() {
const initialValue = document.querySelector(`#${this.initialValueInput}`);
const interestRate = document.querySelector(`#${this.interestRateInput}`);
const growthRate = document.querySelector(`#${this.growthRateInput}`);
const capitalInjection = document.querySelector(
`#${this.capitalInjectionInput}`
);
const totalPeriod = document.querySelector(`#${this.totalPeriodInput}`);
const resultsInterval = document.querySelector(`#${this.resultsInterval}`);
const calculateButton = document.querySelector(`#${this.calculateButton}`);
const cleanButton = document.querySelector(`#${this.cleanButton}`);
const totalInterests = document.querySelector(`#${this.totalInterests}`);
const totalInvested = document.querySelector(`#${this.totalInvested}`);
const totalResult = document.querySelector(`#${this.totalResult}`);
totalInterests.innerText = Formmater.transformToReal(0);
totalInvested.innerText = Formmater.transformToReal(0);
totalResult.innerText = Formmater.transformToReal(0);
const loadMasks = (
initialValue = this.initialValueInput,
capitalInjection = this.capitalInjectionInput,
interestRate = this.interestRateInput,
growthRate = this.growthRateInput
) =>
(function () {
jQuery(`#${initialValue}`).maskMoney({
thousands: ".",
decimal: ",",
allowZero: true,
});
jQuery(`#${capitalInjection}`).maskMoney({
thousands: ".",
decimal: ",",
allowZero: true,
});
jQuery(`#${interestRate}`).maskMoney({
thousands: "",
decimal: ",",
allowZero: true,
});
jQuery(`#${growthRate}`).maskMoney({
thousands: "",
decimal: ",",
allowZero: true,
});
})();
jQuery(loadMasks());
let lastResultInterval = resultsInterval.value;
resultsInterval.addEventListener("change", (event) => {
const periodSpan = document.querySelector(`.period-span`);
const interestSpan = document.querySelector(`.interest-span`);
if (resultsInterval.value == "yearly") {
periodSpan.innerText = "Tempo de investimento anual";
interestSpan.innerText = "Taxa anual de juros";
}
if (resultsInterval.value == "monthly") {
periodSpan.innerText = "Tempo de investimento mensal";
interestSpan.innerText = "Taxa mensal de juros";
}
if (
resultsInterval.value === "yearly" &&
!this.firstResultIntervalChange &&
lastResultInterval != resultsInterval.value
) {
interestRate.value = Formmater.yearToMonthPercentage(
Number(interestRate.value.replace(",", "."))
);
totalPeriod.value = totalPeriod.value / 12;
}
if (
resultsInterval.value === "monthly" &&
!this.firstResultIntervalChange &&
lastResultInterval != resultsInterval.value
) {
interestRate.value = Formmater.monthToYearPercentage(
Number(interestRate.value.replace(",", "."))
);
totalPeriod.value = totalPeriod.value * 12;
}
this.firstResultIntervalChange = false;
lastResultInterval = resultsInterval.value;
});
calculateButton.addEventListener("click", (event) => {
const compoundInterestsCalculator = new CompoundInterestsCalculator({
initialValue: initialValue.value,
interestRate: interestRate.value,
growthRate: growthRate.value,
capitalInjection: capitalInjection.value,
totalPeriod: totalPeriod.value,
resultsInterval: resultsInterval.value,
});
compoundInterestsCalculator.calculate();
totalInterests.innerText =
compoundInterestsCalculator.total.totalInterests;
totalInvested.innerText = compoundInterestsCalculator.total.totalInvested;
totalResult.innerText = compoundInterestsCalculator.total.totalResult;
});
cleanButton.addEventListener("click", (event) => {
initialValue.value = 0;
interestRate.value = 0;
growthRate.value = 0;
capitalInjection.value = 0;
totalPeriod.value = 0;
totalInterests.innerText = Formmater.transformToReal(0);
totalInvested.innerText = Formmater.transformToReal(0);
totalResult.innerText = Formmater.transformToReal(0);
});
}
}
const eventCreator = new EventCreator({
calculateButton: "calculate-button",
capitalInjectionInput: "capital-injection-input",
cleanButton: "clean-button",
growthRateInput: "growth-rate-input",
initialValueInput: "initial-value-input",
interestRateInput: "interest-rate-input",
resultsInterval: "results-interval",
totalPeriodInput: "total-period-input",
totalInterests: "total-interests",
totalInvested: "total-invested",
totalResult: "total-result",
});
eventCreator.start();