<!DOCTYPE html>
<meta charset="UTF-8">
<title>IWM Browser Class Hierarchy</title>
<style>

.node circle {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 3px;
}

.node text {
  font: 12px sans-serif;
}

.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 2px;
}

</style>
<!-- load the d3.js library -->
<script src="./3rdparty/d3/d3.min.js"></script>
<script src="../lib/all.js"></script>

<body oncontextmenu="popupMenu(event); return false;">
<script>

let treeData = null

function popupMenu(event) {
    let cmds = {}
    let className = null;
    switch(event.target.tagName) {
        case "text":
            className = event.target.innerHTML
            break;
        case "circle":
            className = event.target.nextSibling.innerHTML
            break;
        default:
            return
    }
    let node = findNode(treeData, className)
    if (node) {
        cmds['Open JavaScript File'] = () => {
            window.open('.' + node.path) }

        if (node.docPath) {
            cmds['Open Class Doc'] = () => {
                window.open('.' + node.docPath) }
            for(let m of node.methods) {
                let prefix = (m.comment) ? ' • ' : ' - '
                cmds[prefix + m.name] = () => {
                 window.open('.' + node.docPath + '#' + m) }
            }
        }
    }
    PopupMenu.open(cmds, {x: event.pageX, y: event.pageY}, { fontSize: "0.9em", spacing: '2px'})
}

function countLeaves(tree) {
    if (tree.children.length == 0)
        return 1
    let sum = 0
    for(let node of tree.children) {
        sum += countLeaves(node)
    }
    return sum
}

function findNode(tree, name) {
    if (tree.name == name) {
        return tree
    }
    for(let node of tree.children) {
        let found = findNode(node, name)
        if (found != null)
            return found
    }
    return null
}

// Get JSON data
d3.json('./classes.json')
    .then(data => {
        
        treeData = data
        console.log("treeData", countLeaves(treeData))
        // Set the dimensions and margins of the diagram

        var maxHeight = countLeaves(treeData) * 24
        var margin = {top: 20, right: 90, bottom: 30, left: 190},
            width = 1600 - margin.left - margin.right,
            height = maxHeight - margin.top - margin.bottom;

        // append the svg object to the body of the page
        // appends a 'group' element to 'svg'
        // moves the 'group' element to the top left margin
        var svg = d3.select("body").append("svg")
            .attr("width", width + margin.right + margin.left)
            .attr("height", height + margin.top + margin.bottom)
          .append("g")
            .attr("transform", "translate("
                  + margin.left + "," + margin.top + ")");

        var i = 0,
            duration = 750,
            root;

        // declares a tree layout and assigns the size
        var treemap = d3.tree().size([height, width]);

        // Assigns parent, children, height, depth
        root = d3.hierarchy(treeData, function(d) { return d.children; });
        root.x0 = height / 2;
        root.y0 = 0;

        // Collapse after the second level
       // root.children.forEach(collapse);

        update(root);

        // Collapse the node and all it's children
        function collapse(d) {
          if(d.children) {
            d._children = d.children
            d._children.forEach(collapse)
            d.children = null
          }
        }

        function update(source) {

          // Assigns the x and y position for the nodes
          var treeData = treemap(root);

          // Compute the new tree layout.
          var nodes = treeData.descendants(),
              links = treeData.descendants().slice(1);

          // Normalize for fixed-depth.
          nodes.forEach(function(d){ d.y = d.depth * 240});

          // ****************** Nodes section ***************************

          // Update the nodes...
          var node = svg.selectAll('g.node')
              .data(nodes, function(d) {return d.id || (d.id = ++i); });

          // Enter any new modes at the parent's previous position.
          var nodeEnter = node.enter().append('g')
              .attr('class', 'node')
              .attr("transform", function(d) {
                return "translate(" + source.y0 + "," + source.x0 + ")";
            })
            .on('click', click);

          // Add Circle for the nodes
          nodeEnter.append('circle')
              .attr('class', 'node')
              .attr('r', 1e-6)
              .style("fill", function(d) {
                  return d._children ? "lightsteelblue" : "#fff";
              });

          // Add labels for the nodes
          nodeEnter.append('text')
              .attr("dy", ".35em")
              .attr("x", function(d) {
                  return d.children || d._children ? -13 : 13;
              })
              .attr("text-anchor", function(d) {
                  return d.children || d._children ? "end" : "start";
              })
              .text(function(d) { return d.data.name; });

          // UPDATE
          var nodeUpdate = nodeEnter.merge(node);

          // Transition to the proper position for the node
          nodeUpdate.transition()
            .duration(duration)
            .attr("transform", function(d) {
                return "translate(" + d.y + "," + d.x + ")";
             });

          // Update the node attributes and style
          nodeUpdate.select('circle.node')
            .attr('r', 10)
            .style("fill", function(d) {
                return d._children ? "lightsteelblue" : "#fff";
            })
            .attr('cursor', 'pointer');


          // Remove any exiting nodes
          var nodeExit = node.exit().transition()
              .duration(duration)
              .attr("transform", function(d) {
                  return "translate(" + source.y + "," + source.x + ")";
              })
              .remove();

          // On exit reduce the node circles size to 0
          nodeExit.select('circle')
            .attr('r', 1e-6);

          // On exit reduce the opacity of text labels
          nodeExit.select('text')
            .style('fill-opacity', 1e-6);

          // ****************** links section ***************************

          // Update the links...
          var link = svg.selectAll('path.link')
              .data(links, function(d) { return d.id; });

          // Enter any new links at the parent's previous position.
          var linkEnter = link.enter().insert('path', "g")
              .attr("class", "link")
              .attr('d', function(d){
                var o = {x: source.x0, y: source.y0}
                return diagonal(o, o)
              });

          // UPDATE
          var linkUpdate = linkEnter.merge(link);

          // Transition back to the parent element position
          linkUpdate.transition()
              .duration(duration)
              .attr('d', function(d){ return diagonal(d, d.parent) });

          // Remove any exiting links
          var linkExit = link.exit().transition()
              .duration(duration)
              .attr('d', function(d) {
                var o = {x: source.x, y: source.y}
                return diagonal(o, o)
              })
              .remove();

          // Store the old positions for transition.
          nodes.forEach(function(d){
            d.x0 = d.x;
            d.y0 = d.y;
          });

          // Creates a curved (diagonal) path from parent to the child nodes
          function diagonal(s, d) {

            path = `M ${s.y} ${s.x}
                    C ${(s.y + d.y) / 2} ${s.x},
                      ${(s.y + d.y) / 2} ${d.x},
                      ${d.y} ${d.x}`

            return path
          }

          // Toggle children on click.
          function click(d) {
            if (d.children) {
                d._children = d.children;
                d.children = null;
              } else {
                d.children = d._children;
                d._children = null;
              }
            update(d);
          }
        }
    })
    .catch(error => console.error(error))

</script>
</body>