var thisGene = "PTEN";

var render = function (div) {
    var mixed_track = tnt.board.track()
        .height(200)
        .color("#EEEFFF")
        .display(tnt.board.track.feature.genome.transcript()
            .color (function (t) {
                if (t.isGene) {
                    return "#005588";
                }
                return "red";
            })
            .on("click", function (d) {
                console.log(d);
            })
        );

    var mixed_data = tnt.board.track.data.genome.gene();

    var eRest = tnt.board.track.data.genome.ensembl;
    var gene_updater = mixed_data.retriever();
    mixed_data.retriever (function (loc) {
        return gene_updater.call(mixed_track, loc)
            .then (function (genes) { // genes
                for (var i=0; i<genes.length; i++) {
                    genes[i].key = genes[i].id;
                    genes[i].isGene = true;
                    genes[i].exons = [{
                        start: genes[i].start,
                        end: genes[i].end,
                        coding: true,
                        offset: 0,
                        isGene: true
                    }];
                }

                var url = eRest.url()
                    .endpoint("xrefs/symbol/:species/:symbol")
                    .parameters({
                        species: "human",
                        symbol: thisGene
                    });
                return eRest.call(url)
                    .then (function (resp) {
                        var ensId = resp.body[0].id;
                        return ensId;
                    })
                    .then (function (ensId) {
                        var url = eRest.url()
                            .endpoint("lookup/id/:id")
                            .parameters({
                                id: ensId,
                                expand: true
                            });
                        return eRest.call(url);
                    })
                    .then (function (resp) { // transcripts + exons
                        var g = resp.body;
                        var tss = tnt.board.track.data.genome.transcript().gene2Transcripts(g);

                        genes = genes.concat(tss);
                        return genes;
                    });
            });
    });

    mixed_track
        .data(mixed_data);

    var genome = tnt.board.genome().species("human").gene(thisGene).width(950);
    genome(div);
    genome
        .zoom_in(100)
        .add_track(mixed_track);

    genome.start();
};