/*
  Set up an on submit event listener to compute the monthly mortgage payment and update some copy

  Math equation for calculating mortgage payment
  P*r*((1+r)^n)/((1+r)^n)-1))
  P is the principal loan amount
  r is the monthly interest rate
  n is total number of payments on mortgage
*/
document.getElementById("mortgage-calculator-form").addEventListener("submit", (e) => {
  e.preventDefault();
  const loanAmount = parseInt(document.getElementById("loan-amount").value, 10) || 0;
  console.log("Loan Amount", loanAmount);
  const interestRate = (parseInt(document.getElementById("interest-rate").value, 10) || 0) / 12 / 100;
  console.log("Interest rate", interestRate);
  const loanLength = (parseInt(document.getElementById("loan-length-years").value, 10) || 0) * 12;
  console.log("Loan Length: ", loanLength);

  // P*r*((1+r)^n)/((1+r)^n)-1))
  const monthlyMortgagePayment = Math.round(loanAmount * interestRate * (Math.pow(1 + interestRate, loanLength)) / (Math.pow(1 + interestRate, loanLength) - 1));

  const monthlyMortgagePaymentDescription = document.getElementById("monthly-mortgage-description");
  monthlyMortgagePaymentDescription.textContent = `Your monthly mortgage payment will be $${monthlyMortgagePayment.toLocaleString("en-US")}`;
});