//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();
};

//Main() is hard wired as THE place to start calculating when inputs change
//It does no calculations itself, it merely sets them up, sends off variables, gets results and, if necessary, plots them.
function Main() {
    //Save settings every time you calculate, so they're always ready on a reload
    saveSettings();

    //Send all the inputs as a structured object
    //If you need to convert to, say, SI units, do it here!
    const inputs = {
        E1: sliders.SlideE1.value * 1e9, // GPa to Pa 
        E2: sliders.SlideE2.value  * 1e9,
        nu1: sliders.Slidenu1.value,
        nu2: sliders.Slidenu2.value,
        Gf: sliders.SlideGf.value, 
        h1: sliders.Slideh1.value * 1e-9, //nm to m
    };

    //Send inputs off to CalcIt where the names are instantly available
    //Get all the resonses as an object, result


    const result = CalcIt(inputs);

    //Set all the text box outputs
    //plotIt is part of the app infrastructure in app.new.js
    if (result.plots) {
        for (let i = 0; i < result.plots.length; i++) {
            plotIt(result.plots[i], result.canvas[i]);
        }
    }
    document.getElementById('alpha').value = result.alpha;
    document.getElementById('gata').value = result.gata;
    document.getElementById('COS').value = result.COS;
    //You might have some other stuff to do here, but for most apps that's it for Main!
}

//Here's the app calculation
function CalcIt({ E1, E2, nu1,nu2, Gf, h1 }) {
    let aPts = [], vPts = [], alpha, g
    //Poisson corrections
    E1/=(1-nu1*nu1); E2/=(1-nu2*nu2); Gf/=(1-nu1*nu1)
    for (alpha = 0; alpha <= 1.01; alpha += 0.01) { //Extend the range for calcs of wide distributions
        //An ad hoc fitting formula
        if (alpha < 0.6) {
            g = 1.264 + 0.4 * alpha + 2.1 * alpha * alpha
        } else {
            g = 1.29/Math.pow(1-alpha,0.621)
        }
        aPts.push({ x: alpha, y: g })
        acalc = (E1 - E2) / (E1 + E2)
        vPts.push({ x: acalc, y: 0 }); vPts.push({ x: acalc, y: 20 })
    }
    const gata = 1.29/Math.pow(1-acalc,0.621)
    const COS = 100 * Math.sqrt(2 * Gf / (Math.PI * h1 * E1 * gata)) //Converted to %

    const plotData = [aPts, vPts]
    //Now set up all the graphing data detail by detail.
    const prmap = {
        plotData: plotData, //An array of 1 or more datasets
        lineLabels: ["Data", "alpha"], //An array of labels for each dataset
        colors: ["blue", "orange"], //An array of colors for each dataset
        hideLegend: true,
        borderWidth: [2, 1],
        xLabel: 'α&', //Label for the x axis, with an & to separate the units
        yLabel: 'g(α;β)&', //Label for the y axis, with an & to separate the units
        y2Label: null, //Label for the y2 axis, null if not needed
        yAxisL1R2: [], //Array to say which axis each dataset goes on. Blank=Left=1
        logX: false, //Is the x-axis in log form?
        xTicks: null, //We can define a tick function if we're being fancy
        logY: false, //Is the y-axis in log form?
        yTicks: null, //We can define a tick function if we're being fancy
        legendPosition: 'top', //Where we want the legend - top, bottom, left, right
        xMinMax: [0, 1], //Set min and max, e.g. [-10,100], leave one or both blank for auto
        yMinMax: [0, 20], //Set min and max, e.g. [-10,100], leave one or both blank for auto
        y2MinMax: [,], //Set min and max, e.g. [-10,100], leave one or both blank for auto
        xSigFigs: 'P3', //These are the sig figs for the Tooltip readout. A wide choice!
        ySigFigs: 'P3', //F for Fixed, P for Precision, E for exponential
    };

    //Now we return everything - text boxes, plot and the name of the canvas, which is 'canvas' for a single plot
    return {
        plots: [prmap],
        canvas: ['canvas'],
        alpha: acalc.toFixed(3),
        gata: gata.toFixed(1),
        COS: COS.toPrecision(3),
    };
}