import init, { coreapp_new, coreapp_dispatch } from "./kifu_wasm.js";

const inputField = document.getElementById('input-temp');
const fromUnitField = document.getElementById('input-unit');
const toUnitField = document.getElementById('output-unit');
const outputField = document.getElementById('output-temp');
const form = document.getElementById('converter');

function convertTemp(value, fromUnit, toUnit) {
    if (fromUnit === 'c') {
        if (toUnit === 'f') {
            return value * 9 / 5 + 32;
        } else if (toUnit === 'k') {
            return value + 273.15;
        }
        return value
    }
    if (fromUnit === 'f') {
        if (toUnit === 'c') {
            return (value - 32) * 5 / 9;
        } else if (toUnit === 'k') {
            return (value + 459.67) * 5 / 9;
        }
        return value;
    }
    if (fromUnit === 'k') {
        if (toUnit === 'c') {
            return value - 273.15;
        } else if (toUnit === 'f') {
            return value * 9 / 5 - 459.67;
        }
        return value;
    }
    throw new Error('Invalid unit');
}

form.addEventListener('input', () => {
    const inputTemp = parseFloat(inputField.value);
    const fromUnit = fromUnitField.value;
    const toUnit = toUnitField.value;

    const outputTemp = convertTemp(inputTemp, fromUnit, toUnit);
    outputField.value = (Math.round(outputTemp * 100) / 100) + ' ' + toUnit.toUpperCase();
});

init().then(async () => { 
    let app = coreapp_new();
    await coreapp_dispatch(app);
    console.log("kifu_wasm successfully initted");
});