var margin = 20,
    width = 1000 - (margin * 2),
    height = 1000 - (margin * 2)
    colorRange = ["#f1eef6", "#045a8d"],
    x = d3.scale.ordinal().rangeBands([0, width]).domain(d3.range(50));

var color = d3.scale.linear().range(colorRange).domain([.6, 1]);

var svg = d3.select('body')
    .append('svg')
    .attr("width", width + (margin * 10))
    .attr("height", height + (margin * 10))
    .append("g")
    .attr("transform", "translate(" + (margin * 5) + "," + (margin * 5) + ")");

d3.csv('upper.csv', function(error, data) {
    if (error) return console.log(error);

    var row = svg.selectAll(".row")
        .data(data)
        .enter()
        .append("g")
        .attr("class", "row")
        .attr("transform", function(d, i) { return "translate(0," + x(i) + ")"; })
        .each(row);

    row.append("line")
        .attr("x2", width);

    row.append("text")
        .attr("x", -6)
        .attr("y", x.rangeBand() / 2)
        .attr("dy", ".32em")
        .attr("text-anchor", "end")
        .text(function(d) { return d.leg_id; });

    var column = svg.selectAll(".column")
        .data(data)
        .enter().append("g")
        .attr("class", "column")
        .attr("transform", function(d, i) { return "translate(" + x(i) + ")rotate(-90)"; });

    column.append("line")
        .attr("x1", -width);

    column.append("text")
        .attr("x", 6)
        .attr("y", x.rangeBand() / 2)
        .attr("dy", ".32em")
        .attr("text-anchor", "start")
        .text(function(d) { return d.leg_id; });

    function row(row) {

        var array = Object.keys(row).map(function(k) { return row[k]; });
        array.shift();

        var cell = d3.select(this).selectAll(".cell")
            .data(array)
            .enter()
            .append("rect")
            .attr("class", "cell")
            .attr("x", function(d, i) { return x(i); })
            .attr("width", x.rangeBand())
            .attr("height", x.rangeBand())
            .style("fill", function(d) { return d == "x" ? "white" : color(d); });

    }

})