{% extends "graph_base.html" %}

{% block graph %}
    <h1>People following you</h1>
    <div id='chart'> </div>
    <style>
        #chart {
          position: absolute;
          top: 0;
          left: 0;
          width: 100%;
          height: 100%;
          margin: 0;
          padding: 0;
        }

        circle.node {
            stroke: #fff;
            stroke-width: 1.5px;
        }

        line.link {
            stroke: #999;
            stroke-opacity: .6;
        }
    </style>
    <script src="{{ STATIC_URL }}d3/d3.v2.js"></script>
    <script src="{{ STATIC_URL }}/js/jquery.js"></script>
    <script>
    $(document).ready(function(){

        var followers = {{ followers|safe }};
        var map = {};

        var w = $('#chart').width();
            h = $('#chart').height();
        var color = d3.scale.category20();

        /* Use a "flexible force-directed graph layout". */
        var force = d3.layout.force()
                .gravity(.05)
                .distance(250)
                .charge(-1000)
                .size([w, h]);

        var nodes = force.nodes(),
                links = force.links();

        var vis = d3.select("#chart").append("svg:svg")
                .attr("width", w)
                .attr("height", h);

        force.on("tick", function() {
            vis.selectAll("g.node")
                    .attr("transform", function(d) {
                      return "translate(" + d.x + "," + d.y + ")";
                    });

            vis.selectAll("line.link")
                    .attr("x1", function(d) { return d.source.x; })
                    .attr("y1", function(d) { return d.source.y; })
                    .attr("x2", function(d) { return d.target.x; })
                    .attr("y2", function(d) { return d.target.y; });
        });

        function restart() {
            var link = vis.selectAll("line.link")
                    .data(links, function(d) { return d.source.id + "-" + d.target.id; });

            link.enter().insert("svg:line", "g.node")
                    .attr("class", "link");

            link.exit().remove();

            var node = vis.selectAll("g.node")
                    .data(nodes, function(d) { return d.id;});

            var nodeEnter = node.enter().append("svg:g").attr('class', 'node').call(force.drag);
                nodeEnter.append("svg:image")
                    .attr("class", "circle")
                    .attr("xlink:href", function(d){return d.avatar;})
                    .attr("x", "-16px")
                    .attr("y", "-16px")
                    .style("border-radius", "16px;")
                    .attr("width", "64px")
                    .attr("height", "64px");
                nodeEnter.append("title")
                    .text(function(d) { return d.name });

            node.exit().remove();

            force.start();
        }

        // Add three nodes and three links.
        function init() {
            var center = {"name": "{{ request.gh_user.gh_login }}", "avatar": "{{ request.gh_user.avatar_url }}"};
            nodes.push(center);
            for (var i = 0; i<followers.length;i++){
                nodes.push(followers[i]);
                links.push({source:center, target:followers[i]});
                map[followers[i].name] = followers[i];
            }
            restart();
        }

        function addLink(link) {
            links.push(link);
            restart();
        }

        restart();
        init();
        function loadFollowerFollowers(follower){
            $.getJSON('{%  url get_user_followers %}?user=' + follower.name, function(data){
                for (var i = 0; i<data.length; i++){
                    var target = map[data[i]];
                    if (target){
                        addLink({source:follower, target:target})
                    }
                }
            });
            // addLink({source: followers[15], target: followers[5]});
        }
        for (var i = 0; i<followers.length; i++){
            loadFollowerFollowers(followers[i]);
        }

        /* Install an event handler for window resizes */
        $(window).resize(function() {
          var chart = $('#chart');
          var svg = $('#chart svg');
          var w = chart.width();
          var h = chart.height();

          force.size([w, h]);
          svg.width(w);
          svg.height(h);
        });
    });
    </script>
{% endblock %}