function initData(data, colors) {
    var max = 0;

    data.forEach(function (v) {
        v[2] = new Date(v[0]);
        v[3] = d3.keys(v[1]);

        v[3].sort(function (a, b) {
            return v[1][b] - v[1][a];
        });

        var y0 = 0;
        var i = 0;

        var minMax = getValuesMinMax(v[1]);

        v[6] = {};
        v[4] = v[3].map(function (id) {
            var color = colors(normalize(v[1][id], minMax));

            var r = {
                id: id,
                i: i++,
                v: v[1][id],
                y0: y0,
                y1: y0 += v[1][id],
                color: color
            };

            v[6][id] = r;

            return r;
        });

        v[5] = minMax;

        max = Math.max(max, y0);
    });

    return max;
}

function getValuesMinMax(values) {
    var v = [];
    var s = 0;

    for (var k in values) {
        v.push(values[k]);
        s += values[k];
    }

    var r = {
        min: Math.min.apply(this, v),
        max: Math.max.apply(this, v)
    };

    r.diff = r.max - r.min;
    r.sum = s;

    return r;
}

function normalize(v, minMax) {
    return minMax.diff ? (v - minMax.min) / minMax.diff : 0.5;
}