class EtternaFunctions
{
    // erf constants
    public static var a1 =  0.254829592;
    public static var a2 = -0.284496736;
    public static var a3 =  1.421413741;
    public static var a4 = -1.453152027;
    public static var a5 =  1.061405429;
    public static var p  =  0.3275911;

    public static function erf(x:Float):Float
    {
        // Save the sign of x
        var sign = 1;
        if (x < 0)
            sign = -1;
        x = Math.abs(x);
    
        // A&S formula 7.1.26
        var t = 1.0/(1.0 + p*x);
        var y = 1.0 - (((((a5*t + a4)*t) + a3)*t + a2)*t + a1)*t*Math.exp(-x*x);
    
        return sign*y;
    }

    public static function getNotes():Int
    {
        var notes:Int = 0;
        for (i in 0...PlayState.SONG.notes.length) 
        {
            for (ii in 0...PlayState.SONG.notes[i].sectionNotes.length)
            {
                var n = PlayState.SONG.notes[i].sectionNotes[ii];
                if (n[1] <= 0)
                    notes++;
            }
        }
        return notes;
    }

    public static function getHolds():Int
        {
            var notes:Int = 0;
            for (i in 0...PlayState.SONG.notes.length) 
            {
                trace(PlayState.SONG.notes[i]);
                for (ii in 0...PlayState.SONG.notes[i].sectionNotes.length)
                {
                    var n = PlayState.SONG.notes[i].sectionNotes[ii];
                    trace(n);
                    if (n[1] > 0)
                        notes++;
                }
            }
            return notes;
        }

    public static function getMapMaxScore():Int
    {
        return (getNotes() * 350);
    }

    public static function wife3(maxms:Float, ts)
    {
        var max_points = 1.0;
        var miss_weight = -5.5;
        var ridic= 5 * ts;
        var max_boo_weight = 180 * ts;
        var ts_pow = 0.75;
        var zero = 65 * (Math.pow(ts,ts_pow));
        var power = 2.5;
        var dev = 22.7 * (Math.pow(ts,ts_pow));
    
        if (maxms <= ridic) // anything below this (judge scaled) threshold is counted as full pts
            return max_points;
        else if (maxms <= zero) // ma/pa region, exponential
                return max_points * erf((zero - maxms) / dev);
        else if (maxms <= max_boo_weight)// cb region, linear
            return (maxms - zero) * miss_weight / (max_boo_weight - zero);
        else
            return miss_weight;
    }

}