var tserSetCounter = 0;
var tserCounter = 0;
var tserSectionCounter = 0;
var pointCounter = 0;
var lastPoint = 0;

var palette = ['categorical0', 'categorical1', 'categorical2', 'categorical3', 'categorical4'];

var model = {

    tserSectionMaker: function tserSectionMaker(options) {

        var n = options.blockSize || 256;
        var cssStyles = options.cssStyles || [];

        // Simplified geometric brownian motion represented as log returns
        var current = lastPoint;
        var result = {
            key: tserSectionCounter,
            from: pointCounter,
            until: pointCounter + n,
            cssStyles: cssStyles,
            pathDrawer: options.pathDrawer,
            value: Array.apply(null, new Array(n)).map(function() {
                function normalRandom() {
                    return Math.random() + Math.random() + Math.random() + Math.random() + Math.random() + Math.random() - 3;
                }
                current = current + normalRandom();
                return current;
            })
        };
        pointCounter += n;
        tserSectionCounter += 1;
        lastPoint = current;
        return result;
    },

    tserMaker: function(n, maxBlockSize) {
        return d3.range(n).map(function () {
            return model.tserSectionMaker({
                blockSize: maxBlockSize / 4 + Math.round(maxBlockSize * 3 / 4 * Math.random()),
                cssStyles: [palette[Math.floor(palette.length * Math.random())]]
            });
        });
    }
};

function Tser(n) {
    pointCounter = 0;
    lastPoint = 0;
    this.key = tserCounter++;
    this.value = model.tserMaker(n, maxBlockWidth);
    this.xWidth = this.value.reduce(function(prev, next) {
        return prev + next.until - next.from;
    }, 0);
    this.xDomain = extentUnion(this.value.map(function(v) {return [v.from, v.until];}));
    this.yDomain = extentUnion(this.value.map(function(v) {return d3.extent(v.value);}));
}

function TserSet(m, n) {
    this.key = tserSetCounter++;
    this.value = d3.range(m).map(function() {return new Tser(n);});
}