//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 = {
        m: sliders.Slidem.value,
        D: sliders.SlideD.value * 1e-6, //μm 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);
    document.getElementById('Data').value = result.Data;
    if (result.plots) {
        for (let i = 0; i < result.plots.length; i++) {
            plotIt(result.plots[i], result.canvas[i]);
        }
    }

    //You might have some other stuff to do here, but for most apps that's it for Main!
}

//Here's the app calculation
//The inputs are just the names provided - their order in the curly brackets is unimportant!
//By convention the input values are provided with the correct units within Main
function CalcIt({ m, D}) {
    const g=9.81
    let HPts=[],HPPts=[], HMPts=[], i=0, DC=0
    const HPa=1.854*m*g/(D*D) //Pa
    const HV=1.854*m/(D*D*1e6) //g/mm^2
    const depth=1e6*D/(2*1.414*2.475) //to μm
    for (i=0;i<=2*m;i+=2*m/100){
        DC=Math.sqrt(1.854*i*g/HPa)
        HPts.push({x:i,y:DC*1e6})
        DC=Math.sqrt(1.854*i*g/(HPa*1.1))
        HPPts.push({x:i,y:DC*1e6})
        DC=Math.sqrt(1.854*i*g/(HPa*0.9))
        HMPts.push({x:i,y:DC*1e6})
    }
    
    //Now set up all the graphing data detail by detail.
    let plotData = [HMPts,HPts,HPPts], lineLabels = ["-10%","H","+10%"]

    const prmap = {
        plotData: plotData, //An array of 1 or more datasets
        lineLabels: lineLabels, //An array of labels for each dataset
        hideLegend: false, //Set to true if you don't want to see any labels/legnds.
        xLabel: 'Mass&kg', //Label for the x axis, with an & to separate the units
        yLabel: 'D&μm', //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: undefined, //We can define a tick function if we're being fancy
        logY: false, //Is the y-axis in log form?
        yTicks: undefined, //We can define a tick function if we're being fancy
        legendPosition: 'top', //Where we want the legend - top, bottom, left, right
        xMinMax: [0,], //Set min and max, e.g. [-10,100], leave one or both blank for auto
        yMinMax: [0,], //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: 'F1', //These are the sig figs for the Tooltip readout. A wide choice!
        ySigFigs: 'F0', //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 {
        Data: "H = " + (HPa/1e9).toPrecision(3) + " GPa, Vickers = " + HV.toPrecision(3) +" h =" +depth.toPrecision(3) + " μm", 
        plots: [prmap],
        canvas: ['canvas'],
    };
}