var Chart = function() {
        var width, height, barPadding, factor, len, svg;

        var addComma = d3.format("0,000");

        var init = function(options) {
            width = options.width || 1000;
            height = options.height || 1000;
            barPadding = options.barPadding || 1;
            factor = options.factor || 1;
        };

        var createSVG = function(){
            svg = d3.select('body')
                .append('svg')
                .attr('width', width)
                .attr('height', height);
            return svg;
        };

        var appendElements = function(data, element) {
            len = data.length;

            return svg.selectAll(element)
                .data(data)
                .enter()
                .append(element);
        };

        var drawElements = function(elements, key){
            elements
                .attr({
                    x: 0,
                    y: function(d, i) {
                        return i * 10;
                    },
                    width:  function(d,i){
                        return +d[key]/factor;
                    },
                    height: 8
                });
        };

        var addToolTip = function(elements, label, value) {
            elements
                .append('title')
                .text(function(d){
                    return d[label] + ': ' + addComma(d[value]);
                });
        };


        return {
            appendElements: appendElements,
            drawElements: drawElements,
            addToolTip: addToolTip,
            createSVG: createSVG,
            init: init
        };

    };