<script>

var winHeight = window.innerHeight;
var winWidth  = window.innerWidth;

// links in the initial tree drawing use this generator
var treeLink = d3.svg.diagonal.radial()
    .projection(function(d) { return [d.y, d.x / 180 * Math.PI]; });

// actual device neighbor links use this generator
var neighLink = d3.svg.diagonal.radial();

// store x,y for all circles on the map
var loc = {};
// store actual links between all nodes
var neighbors_data = {};

// main SVG background, with support for pan/zoom
var svg = d3.select("#netmap_pane").append("svg")
    .attr("width", winWidth - 50)
    .attr("height", winHeight - 100)
    .attr("pointer-events", "all")
  .append('g')
    .call(d3.behavior.zoom().on("zoom", redraw))
  .append("g")
    .attr("transform", "translate(" + winHeight / 2 + "," + winHeight / 2 + ")");

// this is the image background
// XXX there must be a way to discover the radial tree's size?
svg.append('rect')
    .attr("x", (0 - (winHeight * 2)))
    .attr('width', "400%")
    .attr("y", (0 - (winHeight * 2)))
    .attr('height', "400%")
    .attr('fill', 'white');

// handle pan and zoom
function redraw() {
  svg.attr("transform",
    "translate(" + d3.event.translate + ")"
    + "scale(" + d3.event.scale + ")"
    + "translate(" + (winHeight / 2) + "," + (winHeight / 2) + ")");
}

// save the x,y of an element into the loc dictionary
function recordLocation(d,i) {
  var rect = this.getBoundingClientRect();
  loc[d.name] = {
    'x':  (rect.left + ((rect.right - rect.left) / 2))
    ,'y': (rect.top +  ((rect.bottom - rect.top) / 2))
  };
}

// convert a device name to a valid CSS class name
function to_class(name) { return 'nd_' + name.replace(/\./g, "_") }

// handler for clicking on a circle - redirect to that device's netmap
function circleClick(d) {
    window.location = '[% uri_for('/device') %]?tab=netmap'
                      + '&q=' + d.fullname
                      + '&depth=[% params.depth | uri %]'
                      + '&vlan=[% params.vlan | uri %]';
}

// handler for mouseover on a circle - show that device's real neighbors
function circleOver(d) {
    $('.link').hide();
    $('path.' + to_class(d.name)).show();
    $(this).css('cursor', 'pointer');

    $.each(neighbors_data[d.name], function(idx, target) {
      if (! (target in loc)) { return true }
      $('circle.' + to_class(target)).css('fill', '#e96cfa');
    });
}

// handler for mouseout on a circle - hide real neighbours and show treeLinks
function circleOut(d) {
    $.each(neighbors_data[d.name], function(idx, target) {
      if (! (target in loc)) { return true }
      $('circle.' + to_class(target)).css('fill', '#fff');
    });

    $(this).css('cursor', 'auto');
    $('path.' + to_class(d.name)).hide();
    $('.link').show();
}

// load all device connections into neighbors_data dictionary
$.getJSON('[% uri_for('/ajax/data/device/alldevicelinks') %]', function(data) {
  neighbors_data = data;

  // draw the tree
  d3.json("[% uri_for('/ajax/data/device/netmap') %]?"
          + '&q=[% params.q | uri %]'
          + '&depth=[% params.depth | uri %]'
          + '&vlan=[% params.vlan | uri %]', function(error, root) {
    var tree = d3.layout.tree()
        // magic number "8" for scaling (network depth). seems to make things look right for me.
        .size([360, (winHeight / 8 * (root['scale'] || 0))])
        .separation(function(a, b) { return (a.parent == b.parent ? 1 : 2) / a.depth; });

    var nodes = tree.nodes(root),
        links = tree.links(nodes);

    var link = svg.selectAll(".link")
        .data(links)
      .enter().append("path")
        .attr("class", "link")
        .attr("d", treeLink);

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

    // begin to draw...
    d3.select("#nd_waiting").remove();

    node.append("circle")
        .attr("r", 4.5)
        // circle has class name of its device, so we can show/hide it
        .attr("class", function(d) { return to_class(d.name) })
        // store the x,y of every circle we've just drawn
        .each(recordLocation)
        // handlers for mouse interaction with the circles
        .on("click", circleClick)
        .on("mouseover", circleOver)
        .on("mouseout", circleOut);

    node.append("text")
        .attr("dy", ".31em")
        .attr("text-anchor", function(d) { return d.x < 180 ? "start" : "end"; })
        .attr("transform", function(d) { return d.x < 180 ? "translate(8)" : "rotate(180)translate(-8)"; })
        .text(function(d) { return d.name; });

    // reorient text on the root node
    svg.select(".node")
        .attr("transform", function(d) {
          return d.x < 180 ? "rotate(0)translate(0)" : "rotate(180)translate(0)"; });

    // key (name) of the root node in our locations store
    var rootname = svg.select(".node").data()[0].name;
    // reformatted neighbors_data for the real neighbor links
    var neighbors = [];

    // need to build neighbors array only after we have built loc dictionary,
    // after drawing the circles and storing their x,y
    $.each(neighbors_data, function(key, val) {
      if (! (key in loc)) { return true }

      $.each(val, function(idx, name) {
        if (! (name in loc)) { return true }

        neighbors.push({
          'source':  {
            'name': key
            ,'x': loc[key]['x']
            ,'y': loc[key]['y']
          }
          ,'target': {
            'name': name
            ,'x': loc[name]['x']
            ,'y': loc[name]['y']
          }
        });
      });
    });

    // insert Netdisco neighbor links below circles but above tree links
    svg.selectAll(".neighbor")
        .data(neighbors)
      .enter().insert("path", ".node")
        // add class name of source device, so we can show/hide the link
        // (also "neighbor" class)
        .attr("class", function(d) { return ("neighbor " + to_class( d.source.name )) })
        .attr("d", neighLink)
        .attr("transform", "translate(-" + loc[rootname]['x'] + ",-" + loc[rootname]['y'] + ")");
  });

}); // jquery getJSON for all connections

// vim: ft=javascript
</script>

<div id="nd_waiting" class="span2 alert"><i class="icon-spinner icon-spin"></i> Waiting for results...</div>
