/*
1 meter = 3.281 feet
1 liter = 0.264 gallon
1 kilogram = 2.204 pound
*/

const conversionInputEl = document.getElementById("conversion-input");
const convertUnitsBtn = document.getElementById("convert-units-btn");

function renderUnits() {
// const regex =  /^[0-9]+$/;    

    if(conversionInputEl.value) {
        // console.log(regex.test(conversionInputEl.value));
        // if(regex.test(conversionInputEl.value)) {
            convertLength();
            convertVolume();
            convertMass();  
            // document.getElementById("alert").textContent = "";          
        // } else {
            // console.log("Please enter numbers only");
            // document.getElementById("alert").textContent = "Please enter numbers only";
        // }
    }
}

function convertLength() {
    const oneMetreInFeet = 3.281;
    const metresToFeet = (conversionInputEl.value * oneMetreInFeet).toFixed(2);
    const feetToMetres = (conversionInputEl.value / oneMetreInFeet).toFixed(2);
    document.getElementById("lengthEl").textContent = `${conversionInputEl.value} metres = ${metresToFeet} feet | ${conversionInputEl.value} feet = ${feetToMetres} metres`;
}

function convertVolume() {
    const oneLitreInGallons = 0.264;
    const litresToGallons = (conversionInputEl.value / oneLitreInGallons).toFixed(2);
    const gallonsToLitres = (conversionInputEl.value * oneLitreInGallons).toFixed(2);
    document.getElementById("volumeEl").textContent = `${conversionInputEl.value} litres = ${litresToGallons} gallons | ${conversionInputEl.value} gallons = ${gallonsToLitres} litres`;
}

function convertMass() {
    const oneKiloInPounds = 2.204;
    const kiloToPounds = (conversionInputEl.value * oneKiloInPounds).toFixed(2);
    const poundsToKilos = (conversionInputEl.value / oneKiloInPounds).toFixed(2);
    document.getElementById("massEl").textContent = `${conversionInputEl.value} kilos = ${kiloToPounds} pounds | ${conversionInputEl.value} pounds = ${poundsToKilos} kilos`;
}


convertUnitsBtn.addEventListener("click", renderUnits)