var Dataset = function(jsonData)
{
    // declare memebers
    this.raw = null;
    this.nodes = null;
    this.links = null;
    this.colorScale = null;
    this.n = null;
    this.max = 0;

    var alias = this;

    // process data
    // group by and count champion types
    this.raw = {};
    jsonData.forEach(function(champion) 
    {
        alias.raw[champion.primary] =
            (alias.raw[champion.primary]) ? alias.raw[champion.primary] + 1 : 1;
    });

    // prepare nodes
    this.nodes = [];
    for (key in this.raw)
    {
        this.nodes.push({
            category: key, 
            count: this.raw[key], 
            radius: this.raw[key] * 5 
        });

        if (this.raw[key] > this.max)
        {
            this.max = this.raw[key];
        }
    }

    this.links = [];
    for (var i = 0; i < this.nodes.length; ++i)
    {
        for (var j = 0; j < this.nodes.length; ++j)
        {
            if (j != i)
            {
                this.links.push({ source: i, target: j, graph: 0 });
            }
        } 
    }

    this.colorScale = d3.scale.category10();

    for (var i = 0; i < this.nodes.length; ++i)
    {
        this.nodes[i].color = this.colorScale(i);
    }

    this.n = this.nodes.length;
}

Dataset.prototype.getNodes = function()
{
    return this.nodes;
}

Dataset.prototype.getLinks = function()
{
    return this.links;
}