//One universal basic required here to get things going once loaded
window.onload = function () {
    //restoreDefaultValues(); //Un-comment this if you want to start with defaults
    Main();
};
//Any global variables go here


//Main is hard wired as THE place to start calculating when input changes
//It does no calculations itself, it merely sets them up, sends off variables, gets results and, if necessary, plots them.
function Main() {
    saveSettings();

    //Send all the inputs as a structured object
    //If you need to convert to, say, SI units, do it here!
    const inputs = {
        E: sliders.SlideE.value * 1e9, //From GPa
        sigma0: sliders.Slidesigma0.value * 1e9,
        F: sliders.SlideF.value,
        A0: sliders.SlideA0.value * 1e-4, //cm2 to m2
        Rq: sliders.SlideRq.value * 1e-6, //From μm
        Dq: sliders.SlideDq.value
    }

    //Get all the resonses as a structure
    const result = CalcIt(inputs)

    //Set all the text box outputs
    document.getElementById('Reff').value = result.Reff
    document.getElementById('A').value = result.A
    document.getElementById('Arel').value = result.Arel
    document.getElementById('sigmaRel').value = result.sigmaRel
    if (result.sigmaRel > 1) {
        document.getElementById('sigmaRel').style.backgroundColor = "pink"
    } else {
        document.getElementById('sigmaRel').style.backgroundColor = document.getElementById('Arel').style.backgroundColor
    }
    document.getElementById('condRel').value = result.condRel
}

//Here's the real app calculation
function CalcIt({ E, sigma0, F, A0, Rq, Dq }) {
    //The structure automatically has the names provided from input
    //By convention the values are provided with the correct units within CalcIt
    const Reff = Rq / Math.pow(Dq, 2)
    const Poisson = 0.3 //The exact value doesn't matter much
    const Estar = E / (2 * (1 - Math.pow(Poisson, 2)))
    const A = 2 * F / (Estar * Dq)
    const sigmaRel = (F / A) / sigma0
    const condRel = Math.min(1, 3.7 * F / (Estar * Rq))

    return {
        Reff: (Reff * 1e6).toPrecision(3),
        A: (A * 1e12).toPrecision(3) + "μm²",
        Arel: (A / A0).toExponential(3),
        sigmaRel: sigmaRel.toPrecision(3),
        condRel: condRel.toPrecision(3),
    }
}