$(function(){
  $("table.calculator-loan :input").keydown(function(){
    Calculator_Loan($(this));
  }).keyup(function(){
    Calculator_Loan($(this));
  }).change(function(){
    Calculator_Loan($(this));
  }).blur(function(){
    Calculator_Loan($(this));
  });

  $("table.calculator-lease :input").keydown(function(){
    Calculator_Lease($(this));
  }).keyup(function(){
    Calculator_Lease($(this));
  }).change(function(){
    Calculator_Lease($(this));
  }).blur(function(){
    Calculator_Lease($(this));
  });

  $("table.calculator-afford :input").keydown(function(){
    Calculator_Afford($(this));
  }).keyup(function(){
    Calculator_Afford($(this));
  }).change(function(){
    Calculator_Afford($(this));
  }).blur(function(){
    Calculator_Afford($(this));
  });

});

function Calculator_Loan(field) {
  var calcTable = field.closest("table.calculator-loan");
  var vehiclePrice = parseFloat(calcTable.find(".calc-vehicle-price").val());
  var downPayment = parseFloat(calcTable.find(".calc-down-payment").val());
  var tradeInValue = parseFloat(calcTable.find(".calc-trade-in-value").val());
  var salesTax = parseFloat(calcTable.find(".calc-sales-tax").val());
  var interestRate = parseFloat(calcTable.find(".calc-interest-rate").val());
  var loanTerm = parseInt(calcTable.find(".calc-loan-term").val());
  
  var loanAmount = 0;
  var monthlyPayment = 0;
  
  if (vehiclePrice > 0) {
    loanAmount += vehiclePrice;
    if (salesTax > 0) loanAmount += loanAmount * (salesTax / 100);
    if (downPayment > 0) loanAmount -= downPayment;
    if (tradeInValue > 0) loanAmount -= tradeInValue;
  }
  
  if (loanAmount > 0 && loanTerm > 0 && interestRate > 0) {
    monthlyPayment = (loanAmount * (interestRate / 1200) * Math.pow((1 + (interestRate / 1200)), loanTerm)) / (Math.pow((1 + (interestRate / 1200)), loanTerm) - 1);
    calcTable.find(".calc-loan-amount").val(FormatNumber(loanAmount, 2));
    calcTable.find(".calc-monthly-payment").val(FormatNumber(monthlyPayment, 2));
  } else {
    calcTable.find(".calc-loan-amount").val("");
    calcTable.find(".calc-monthly-payment").val("");
  }
}

function Calculator_Lease(field) {
  var calcTable = field.closest("table.calculator-lease");
  var vehiclePrice = parseFloat(calcTable.find(".calc-vehicle-price").val());
  var downPayment = parseFloat(calcTable.find(".calc-down-payment").val());
  var tradeInValue = parseFloat(calcTable.find(".calc-trade-in-value").val());
  var salesTax = parseFloat(calcTable.find(".calc-sales-tax").val());
  var residualValue = parseFloat(calcTable.find(".calc-residual-value").val());
  var moneyFactor = parseFloat(calcTable.find(".calc-money-factor").val());
  var loanTerm = parseInt(calcTable.find(".calc-loan-term").val());
  
  var amountFinanced = 0;
  var monthlyPayment = 0;
  
  
  if (vehiclePrice > 0) {
    amountFinanced += vehiclePrice;
    if (downPayment > 0) amountFinanced -= downPayment;
    if (tradeInValue > 0) amountFinanced -= tradeInValue;
  }
  
  if (amountFinanced > 0 && loanTerm > 0 && moneyFactor > 0) {
    if (!(residualValue>0)) residualValue = 0;
		var depreciation = (amountFinanced - residualValue) / loanTerm;
		var leaseCharge = (residualValue + amountFinanced) * moneyFactor;
		monthlyPayment = leaseCharge + depreciation;

    if (salesTax > 0) monthlyPayment += monthlyPayment * (salesTax / 100);

    var leasePrice = monthlyPayment * loanTerm;

    calcTable.find(".calc-lease-price").val(FormatNumber(leasePrice, 2));
    calcTable.find(".calc-monthly-payment").val(FormatNumber(monthlyPayment, 2));
  } else {
    calcTable.find(".calc-lease-price").val("");
    calcTable.find(".calc-monthly-payment").val("");
  }
}

function Calculator_Afford(field) {
  var calcTable = field.closest("table.calculator-afford");
  var monthlyPayment = parseFloat(calcTable.find(".calc-monthly-payment").val());
  var downPayment = parseFloat(calcTable.find(".calc-down-payment").val());
  var tradeInValue = parseFloat(calcTable.find(".calc-trade-in-value").val());
  var salesTax = parseFloat(calcTable.find(".calc-sales-tax").val());
  var interestRate = parseFloat(calcTable.find(".calc-interest-rate").val());
  var loanTerm = parseInt(calcTable.find(".calc-loan-term").val());
  
  var loanAmount = 0;
  var vehiclePrice = 0;
  
  if (monthlyPayment > 0) {
    if (interestRate > 0) {
      var denom = 1 - Math.pow((1 + (interestRate / 1200)), (-1 * loanTerm));
      vehiclePrice = monthlyPayment * denom / (interestRate / 1200);
    } else {
      vehiclePrice = monthlyPayment * loanTerm;
    }
    
    if (!(salesTax > 0)) salesTax = 0;
    if (!(downPayment > 0)) downPayment = 0;
    if (!(tradeInValue > 0)) tradeInValue = 0;
    vehiclePrice = (vehiclePrice + downPayment + tradeInValue) / (1 + (salesTax / 100));

    var vehiclePriceTax = vehiclePrice * (salesTax / 100);
    loanAmount = vehiclePriceTax + vehiclePrice - downPayment - tradeInValue;

    calcTable.find(".calc-loan-amount").val(FormatNumber(loanAmount, 2));
    calcTable.find(".calc-vehicle-price").val(FormatNumber(vehiclePrice, 2));
  } else {
    calcTable.find(".calc-loan-amount").val("");
    calcTable.find(".calc-vehicle-price").val("");
  }
}

function Calculator_ShowLeaseTerms() {
  var info = "<div style='width: 400px;'><b style='color: #00f;'>Residual Value:</b>&nbsp; This is the projected market value of a vehicle at the end of the lease which is used to determine the cost of the lease.<br/><br/>" 
    + "<b style='color: #00f;'>Money Factor:</b>&nbsp; For a lease, the &quot;money factor&quot; is a fractional number used to calculate the lease charge or fee. "
    + "Your monthly payment for a lease is a combination of the depreciation charge and this fee.<br/><br/>"
    + "To compare the money factor with a more typical APR, multiply it by 2,400. The result will be a slightly higher than the equivalent APR. "
    + "This value is more useful for comparing leases with each other than with loans, however, because it doesn’t account for all fees and only loans build equity.</div>"
  Dialog_Info("Lease Calculator Terms", info);
}