//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 = {
        h: sliders.Slideh.value/1e6,
        lambda: sliders.Slidelambda.value / 1e6/(2*Math.PI),
        Visc: sliders.SlideVisc.value/1e3,
        Vmax: sliders.SlideVmax.value/1e3,
        ST: sliders.SlideST.value/1e3,
        tmax: sliders.Slidetmax.value,
    };

    //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
    document.getElementById('LT').value = result.LT 
    //Do all relevant plots by calling plotIt - if there's no plot, nothing happens
    //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]);
        }
    }

    //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({ h,lambda, Visc, ST, tmax,Vmax }) {
    let Ptsh=[],ts,ht
    const t0 = 3 * Visc * Math.pow(lambda, 4) / (ST * h * h * h)
    const Vdiff=Math.max(1,(Vmax-Visc)/Visc)
    let t=t0
    let LT=(t*1e6).toPrecision(3)+"μs"
    if (t>=1e-3 && t<1)LT=(t*1e3).toPrecision(3)+"ms"
    if (t>=1 && t<1000) LT=(t).toPrecision(3)+"s"
    if (t>=1000)  LT = t.toPrecision(5)+"s"
    for (ts=0;ts<=tmax;ts+=tmax/100){
        //The "fluidity" correction from Overdiep
        t=t0*(1+ts/tmax*Vdiff/2)
        ht=Math.exp(-ts/t)
        Ptsh.push({x:ts,y:ht})
    }

    const plotData = [Ptsh]

    const lineLabels = ["d dependence at chosen wavelength λ"]
    const lineLabels1 = ["λ dependence at chosen particle size d"]
    const myColors = ["blue"]
    const myColors1 = ["orange"]
    const borderWidth = [2]

    //Now set up all the graphing data detail by detail.
    const prmap = {
        plotData: plotData, //An array of 1 or more datasets
        fontSize:20,
        lineLabels: lineLabels, //An array of labels for each dataset
        colors: myColors, //An array of colors for each dataset
        hideLegend: true,
        borderWidth: borderWidth,
        xLabel: 't&s', //Label for the x axis, with an & to separate the units
        yLabel: 'Relative Amplitude&', //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: [,], //Set min and max, e.g. [-10,100], leave one or both blank for auto
        yMinMax: [0,1], //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: 'F0', //These are the sig figs for the Tooltip readout. A wide choice!
        ySigFigs: 'F2', //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'],
        LT:LT
    };
}