"use strict";

//Calc resale value of a car
// Take init value of car
// Take amount of yearly depreciation as a percentage
// take age of car in years
// Use a loop to depreciate a car year by year
// Write out each year's value
// Return errors if input is invalid
let invalid = true;
let initValue;;
let depreciationPercent;;
let carAge;

while (invalid){
	initValue = parseFloat(
		prompt("What was the initial value of the car? "));
	console.log("initValue: " + initValue);

	depreciationPercent = parseFloat(
		prompt("What is the year depreciation rate (percentage) of the car? "));
	console.log("depreciationPercent: " + depreciationPercent);

	carAge = parseFloat(
		prompt("What is the age of the car in years?"));
	console.log("carAge: " + carAge);

	if ((isNaN(initValue) || initValue < 0) ||
		(isNaN(depreciationPercent) || depreciationPercent < 0) ||
		(isNaN(carAge) || carAge < 0)) {
		alert("You must use only 0 or positive numbers!!!\n Try again.");
	}
	else{
		invalid = false;
	}
}

document.write(`<p>Initial value: ${initValue}</p>`);
document.write(`<p>Depreciation Rate: ${depreciationPercent}</p>`);
document.write(`<p>Car Age: ${carAge}</p>`);
let newValue = initValue;

for (var i = 0; i <= carAge; i++){
	document.write(`<p> Year ${i}: ${newValue.toFixed(2)} </p>`);
	if (depreciationPercent > 0){
		newValue -= newValue * (depreciationPercent/100);
	}
}