(function () {

    var app = angular.module('d3', []);

    //directive to show a 'wheel' UI to view competetency tree structures
    app.directive('competencyWheel', ['$window', function ($window) {
        "use strict";
        return {
            restrict: "EA",
            scope: {
                competencies: '=', //the competencies to display in the wheel
                skinName:'=',
                onCompetencyClick: '&' //the function that is called when a competency is clicked in the wheel
            },
            link: link
        }
        
        function link(scope, element, attrs) {
            //the colour of the labels and center text - passed as an attribute and defaults to white
            var textColour = attrs.textColour || 'white';
            //the duration (in milliseconds) of the transition when zooming - passed as an attribute but defaults to 750
            var transitionDuration = attrs.transitionDuration || 750;
            //the name of one of the preset skins - defaults to 'default'
            var skinName = scope.skinName || 'leafy';
            //the size factor of the wheel in the SVG
            var sizeFactor = attrs.sizeFactor || 0.9;
            //based on the name of the chosen skin get the skin data
            var skinData = getSkinData(skinName);

            //create the SVG element on the element that the directive represents
            var svg = d3.select(element[0]).append("svg")
                .attr("id","svg") //give it an id so we can get it again in the future
                .append("g") //create a group that will hold the rest of the wheel
                .attr("id","maingroup");
            
            //build the tooltip using the d3 plugin
            var tip = buildToolTip();
            var competencies = [];
            var current = [];
            var partition, arc, center, centerCircle, path, labels, data, margin, radius, width, height, borderRadius;

            //when the window is resized update the scope so the wheel is rendered at the appropriate size
            window.onresize = function () {
                scope.$apply();
            };

            //watch the inner width of the element that contains the directive, if it changes we need to rerender the wheel
            scope.$watch(function () {
                return angular.element($window)[0].innerWidth;
            }, function () {
                if(data)
                    scope.render(data);
            });

            ////watch the competencies on the scope, if they change we need to rerender the wheel
            scope.$watch('competencies', function (newCompetenciesValue, oldCompetenciesValue) {
                if (newCompetenciesValue&& newCompetenciesValue.length > 0) {
                    data = parseCompetencies(newCompetenciesValue[0]);
                    scope.render(data);
                }
            });

            //render the wheel
            scope.render = function (comps) {
                //remove all traces of the previous wheel - if there are any
                svg.selectAll('*').remove();
                
                //this is responsive - i.e. the wheel should change size if the browser window changes size
                //get the width of the element that contains the directive
                

                var containerWidth = d3.select(element[0]).node().offsetWidth;
       
                if (containerWidth === 0)
                    containerWidth = 500;

                //make the svg width a bit smaller than the maximum space
                width = containerWidth * sizeFactor;
                height = width; //height of the svg
                radius = getRadius(width); //the radius of the wheel
                margin = getMargin(width);
                borderRadius = width; //radius of the svg

                //set the size attributes on the svg
                d3.select("#svg")
                    .attr("width", width + "px")
                    .attr("height", height + "px")
                    .style("border-radius", borderRadius + "px");

                //move the main group to the center of the svg
                d3.select("#maingroup")
                .attr("transform", "translate(" + margin + "," + margin + ")");
                current = comps;
                competencies = comps;

                //build the wheel partitions and arcs
                partition = buildPartition();
                arc = buildArc();
                //build the central circle and set the appropiate text
                center = buildCenter();
                centerCircle = buildCenterCircle();
                setInitialCentralCircleText(current.label);
                path = buildPath();
                //setup the tool tips
                svg.call(tip);
                //set up the labels
                labels = buildLabels();
                splitText(labels);
            }

            function getMargin(theWidth) {
                return theWidth / 2;
            }

            function getRadius(theWidth) {
                return (theWidth / 2) * sizeFactor;
            }

            // Zoom to the specified new root.
            function zoom(root, competency) {
                if (document.documentElement.__transition__)
                    return;

                // Rescale outside angles to match the new layout.
                var enterArc, exitArc;
                var outsideAngle = d3.scale.linear().domain([0, 2 * Math.PI]);

                function insideArc(d) {
                    return competency.key > d.key
                        ? { depth: d.depth - 1, x: 0, dx: 0 } : competency.key < d.key
                            ? { depth: d.depth - 1, x: 2 * Math.PI, dx: 0 }
                            : { depth: 0, x: 0, dx: 2 * Math.PI };
                }

                function outsideArc(d) {
                    return { depth: d.depth, x: outsideAngle(d.x), dx: outsideAngle(d.x + d.dx) - outsideAngle(d.x) };
                }

                center.datum(root);

                // When zooming in, arcs enter from the outside and exit to the inside.
                // Entering outside arcs start from the old layout.
                if (root === competency)
                    enterArc = outsideArc, exitArc = insideArc, outsideAngle.range([competency.x, competency.x + competency.dx]);

                path = path.data(partition.nodes(root).slice(1), function (d) {
                    return d.key;
                });


                // When zooming out, arcs enter from the inside and exit to the outside.
                // Exiting outside arcs transition to the new layout.
                if (root !== competency)
                    enterArc = insideArc, exitArc = outsideArc, outsideAngle.range([competency.x, competency.x + competency.dx]);

                d3.transition().duration(transitionDuration).each(function () {
                    path.exit().transition()
                        .style("fill-opacity", function (d) {
                            return d.depth === 1 + (root === competency) ? 1 : 0;
                        })
                        .attrTween("d", function (d) {
                            return arcTween.call(this, exitArc(d));
                        })
                        .remove();

                    path.enter().append("path")
                        .attr("class", "wheelcolor")
                        .attr("id", function (d) {
                            return d.id;
                        })
                        .style("fill-opacity", function (d) {
                            return d.depth === 2 - (root === competency) ? 1 : 0;
                        })
                        .style("fill", skinData.group)
                        .on("click", zoomIn)
                        .each(function (d) {
                            this._current = enterArc(d);
                            d.path = this;
                        })
                        .on('mouseenter', function (d) {
                            tip.show(d, d.path);
                        })
                        .on('mouseleave', tip.hide);

                    path.transition()
                        .style("fill-opacity", function (d) {
                            return 1 / d.depth;
                        })
                        .attrTween("d", function (d) {
                            return arcTween.call(this, updateArc(d));
                        });

                    labels = labels.data(partition.nodes(root).filter(function (d) {
                        return d.depth === 1;
                    }), function (d) {
                        return d.key;
                    });

                    labels.enter().append("text")
                        .attr("class", "label")
                        .attr("class", "label")
                        .style("opacity", 0)
                        .style("fill", textColour)
                        .style("text-anchor", "middle")
                        .each(function (d) {
                            d3.select(this).classed("cat" + d.category, true);
                        })
                        .attr("transform", function (d) {
                            return "translate(" + arc.centroid(d) + ")";
                        })
                        .on("click", zoomIn)
                        .on('mouseenter', function (d) {
                            tip.show(d, d.path);
                        })
                        .on('mouseleave', tip.hide)
                        .text(function (d, i) {
                            return d.label.replace(/.{10}\S*\s+/g, "$&@@").split(/\s+@@/)[0];
                        });
                    splitText(labels);
                });
            }

            function setInitialCentralCircleText(text) {
                var backButtonHeight = 30;
                var backButtonWidth = 30;

                center.append("text")
                        .each(function (d) {
                            var arr = text.match(/\b[\w']+(?:[^\w\n]+[\w']+){0,1}\b/g);
                            if (arr != undefined) {
                                for (var i = 0; i < arr.length; i++) {
                                    d3.select(this).append("tspan")
                                        .text(arr[i])
                                        .attr("y", -12)
                                        .attr("dy", i + ".2em")
                                        .attr("x", 0)
                                        .attr("fill", textColour)
                                        .attr("text-anchor", "middle")
                                        .attr("id", "centertext")
                                        .attr("class", "tspan" + i);
                                }
                            }
                        });

                center.append("svg:image")
                    .attr("id", "centerbackbutton")
                    .attr("width", function(d, i) {
                        return backButtonWidth;
                    })
                    .attr("height", function(d, i) {
                        return backButtonHeight;
                    })
                    .attr("x", function(d, i) {
                        return 0 - (backButtonWidth / 2);
                    })
                    .attr("y", function(d, i) {
                        return 5;
                    })
                    .style("visibility", function(d) {
                                return "hidden";
                    })
                    .style("cursor","pointer")
                    .attr("xlink:href", "https://uiframework.mkmapps.com/latest/lib/products/myshowcase/images/512px-Undo_font_awesome.svg.png?version=270122");
                //center.append("foreignObject")
                //    .attr("id", "centerbackbutton")
                //    .attr("width", function(d, i) {
                //        return backButtonWidth;
                //    })
                //    .attr("height", function(d, i) {
                //        return backButtonHeight;
                //    })
                //    .attr("x", function(d, i) {
                //        return 0 - (backButtonWidth / 2);
                //    })
                //    .attr("y", function(d, i) {
                //        return 5;
                //    })
                //    .style("visibility", function(d) {
                //        return "hidden";
                //    });
                //.html("<div style='color: #ffffff;cursor: pointer'><i class='fa fa-undo fa-2x'></i></div>");
            }

            function zoomIn(competency) {
                tip.hide();
                if (document.documentElement.__transition__)
                    return;
                // Find previously selected, unselect
                d3.select(".selected").classed("selected", false);

                // Select current item
                var id = "#competency" + competency.id;
                d3.select(id).attr("class", "selected");

                if (competency.depth > 1)
                    competency = competency.parent;
              
                if (competency.children) {
                    svg.selectAll("text.label").data([]).exit().remove();
                    zoom(competency, competency);
                    changeCenter(competency);
                }
                d3.select("#centerbackbutton")
                    .style("visibility", function (d) {
                        return "visible";
                    })
                    .on("click", function () {
                        zoomOut(current);
                    });
                scope.$apply(function () {
                    if (scope.onCompetencyClick())
                        scope.onCompetencyClick()(competency);
                });

            }

            function key(d) {
                var k = [], p = d;
                while (p.depth)
                    k.push(p.name), p = p.parent;
                return k.reverse().join(".");
            }

            function arcTween(b) {
                var i = d3.interpolate(this._current, b);
                this._current = i(0);
                return function (t) {
                    return arc(i(t));
                };
            }

            function parseCompetencies(data) {
                
                var root = {
                    id: data.id,
                    name: data.name,
                    description: data.description,
                    children: parseChildren(data.branches)
                };
                return root;
            }

            function parseChildren(children) {
                var wheelChildren = [];

                if (children) {
                    children.forEach(function (child) {
                        var dynaChild = {
                            id: child.id,
                            name: child.name,
                            description: child.description,
                            children: parseChildren(child.branches)
                        };
                        wheelChildren.push(dynaChild);
                    });
                }
                return wheelChildren;
                
            }

            function buildLabels() {
                return svg.selectAll("text.label")
                    .data(partition.nodes(competencies).filter(function (competency) {
                        return competency.depth === 1;
                    }))
                    .enter().append("text")
                    .attr("class", "label")
                    .style("fill", textColour)
                    .style("text-anchor", "middle")
                    .attr("transform", function (competency) {
                        return "translate(" + arc.centroid(competency) + ")";
                    })
                    .each(function (competency) {
                        d3.select(this).classed("cat" + competency.category, true);
                    })
                    .on("click", zoomIn)
                    .on('mouseenter', function (competency) {
                        tip.show(competency, competency.path);
                    })
                    .on('mouseleave', tip.hide)
                    .text(function (competency, i) {
                        return competency.label.replace(/.{10}\S*\s+/g, "$&@@").split(/\s+@@/)[0];
                    });
            }

            function splitText(newLabels) {
                if (!newLabels)
                    return;
                newLabels.append("tspan")
                    .attr("x", 0)
                    .attr("dy", "1em")
                    .text(function (d, i) {
                        return d.label.replace(/.{10}\S*\s+/g, "$&@@").split(/\s+@@/)[1];
                    });
                newLabels.append("tspan")
                    .attr("x", 0)
                    .attr("dy", "1em")
                    .text(function (d, i) {
                        return d.label.replace(/.{10}\S*\s+/g, "$&@@").split(/\s+@@/)[2];
                    });
                newLabels.transition().duration(1000).style("opacity", 1);
            }

            function zoomOut(competency) {
                tip.hide();
                if (document.documentElement.__transition__) return;
                // Find previously selected, unselect
                d3.select(".selected").classed("selected", false);

                if (competency.parent) {
                    svg.selectAll("text.label").data([]).exit().remove();
                    changeCenter(competency.parent);
                    zoom(competency.parent, competency);
                }
            }

            function changeCenter(competency) {
                current = competency;
                d3.select("#centertext")
                    .on("click", function () {
                        zoomOut(current);
                    })
                    .text(function (d) {
                        return current.label;
                    });
                d3.select("#centercircle")
                    .on("click", function () {
                        zoomOut(current);
                    });

                if (!competency.parent) {
                    d3.select("#centerbackbutton")
                    .style("visibility", function (d) {
                        return "hidden";
                    })
                    .on("click", function () {
                        zoomOut(current);
                    });
                }
            }

            function buildPath() {
                return svg.selectAll("path").data(partition.nodes(competencies).slice(1))
                    .enter().append("path")
                    .attr("d", arc)
                    .attr("class", "competency")
                    .attr("id", function (d) {
                        return "competency" + d.id;
                    })
                    .style("fill", skinData.group)
                    .style("fill-opacity", function (d) {
                        return 1 / d.depth;
                    })
                    .each(function (d) {
                        this._current = updateArc(d);
                        d.path = this;
                    })
                    .on("click", zoomIn)
                    .on('mouseenter', function (d) {
                        tip.show(d, d.path);
                    })
                    .on('mouseleave', tip.hide);
            }

            function updateArc(d) {
                return { depth: d.depth, x: d.x, dx: d.dx };
            }

            // Partition is one of d3's built in layouts. See .... for documentation.
            // Define a new partition layout. We'll sort the members alphabetically, but
            // if you don't want sorting just do .sort(none)
            function buildPartition() {
                var part = d3.layout.partition().sort(function (a, b) {
                    return d3.ascending(a.name, b.name);
                }).size([2 * Math.PI, radius]);
                // We'll work out the sum sizes for each node - nodes in the main arc (ie
                // those with a depth of 1) should be equal sizes. Because of the way the d3
                // partition layout works this means that we'll have to work out how many
                // children each competence has, and assign a value to the children of 1/by
                // that number.
                // Also compute the full name of each competence and stash the children so 
                // they can be restored as we descend.
                part.nodes(competencies).forEach(function (competency) {
                    competency._children = competency.branches;
                    competency.sum = 1;
                    if (competency.depth > 1) competency.sum = 1 / Object.keys(competency.branches).length;
                    competency.label = competency.name;
                    competency.key = key(competency);
                });

                // Now redefine the value function to use the previously-computed sum.
                part.children(function (competency, depth) {
                    return depth < 2 ? competency._children : null;
                }).value(function (competency) {
                    return competency.sum;
                });
                return part;
            }


            function buildToolTip() {
                return d3.tip().attr('class', 'd3-tip').offset([10, 0]).html(function (competency) {
                    if (!competency)
                        competency = current;
                    return "<strong>" + (competency.name || "") + "</strong><br /><span>" + (competency.description || "") + "</span>";
                });
            }

            function buildArc() {
                return d3.svg.arc().startAngle(function (d) {
                    return d.x;
                }).endAngle(function (d) {
                    return d.x + d.dx - .01 / (d.depth + .5);
                }).innerRadius(function (d) {
                    return radius / 5 * (d.depth * 1.85);
                }).outerRadius(function (d) {
                    return radius / 5 * (d.depth + 2.6);
                });
            }

            function buildCenter() {
                center = svg.append("g");
                center.attr("transform", "translate(0,0)");
                return center;
            }

            function buildCenterCircle() {
                centerCircle = center.append("circle");
                centerCircle.attr("r", (radius / 5 * 2) - 15)
                    .attr("id", "centercircle")
                    .style("fill", skinData.root);
                return centerCircle;
            }
            
        }

        function getSkinData(skinName) {
            var skins = [
		{ name: 'default', colors: { root: '#1C5288', group: '#2693FF', competency: '#2693FF' } },
		{ name: 'dark', colors: { root: '#91ccff', group: '#74b3ea', competency: '#cccccc' } },
		{ name: 'cloudy', colors: { root: '#909be6', group: '#9399b7', competency: '#aaaaaa' } },
		{ name: 'leafy', colors: { root: '#719f6e', group: '#67b460', competency: '#7ec688' } },
		{ name: 'merlot', colors: { root: '#5d0d0d', group: '#be5c5c', competency: '#b99a9a' } },
		{ name: 'espresso', colors: { root: '#40341f', group: '#7c5a28', competency: '#a88a60' } },
		{ name: 'latte', colors: { root: '#a88a60', group: '#b59c78', competency: '#c1ab8c' } },
		{ name: 'nsa', colors: { root: '#0993CD', group: '#E67D00', competency: '#626250' } },
		{ name: 'nw_metro', colors: { root: '#000000', group: '#766e67', competency: '#a3c6ca' } },
		{ name: 'system', colors: { root: '#666666', group: '#b4ab0e', competency: '#666666' } },
		{ name: 'apple', colors: { root: '#7784a5', group: '#a9b5d3', competency: '#444444' } },
		{ name: 'manager', colors: { root: '#1e206b', group: '#ec008b', competency: '#00a9e0' } },
		{ name: 'database', colors: { root: '#000000', group: '#454545', competency: '#999999' } },
		{ name: 'bars', colors: { root: '#666666', group: '#888888', competency: '#aaaaaa' } },
		{ name: 'blocks', colors: { root: '#777777', group: '#999999', competency: '#bbbbbb' } },
		{ name: 'blocks_wd', colors: { root: '#777777', group: '#999999', competency: '#bbbbbb' } },
		{ name: 'blocks_wd2', colors: { root: '#777777', group: '#999999', competency: '#bbbbbb' } }
            ];
            var skinData = skins[0].colors;
            for (var a = 0; a < skins.length; a++) {
                if (skins[a].name == skinName) {
                    skinData = skins[a].colors;
                    break;
                }
            }
            return skinData;
        }
    }]);

    //directive to show a 'wheel' UI to view competetency tree structures
    app.directive('frameworkWheel', ['$window', function ($window) {
        "use strict";
        return {
            restrict: "EA",
            scope: {
                competencies: '=', //the competencies to display in the wheel
                skinName: '=',
                onCompetencyClick: '&' //the function that is called when a competency is clicked in the wheel
            },
            link: link
        }

        function link(scope, element, attrs) {
            //the colour of the labels and center text - passed as an attribute and defaults to white
            var textColour = attrs.textColour || 'white';
            //the duration (in milliseconds) of the transition when zooming - passed as an attribute but defaults to 750
            var transitionDuration = attrs.transitionDuration || 750;
            //the name of one of the preset skins - defaults to 'default'
            var skinName = scope.skinName || 'leafy';
            //the size factor of the wheel in the SVG
            var sizeFactor = attrs.sizeFactor || 0.9;
            //based on the name of the chosen skin get the skin data
            var skinData = getSkinData(skinName);

            //create the SVG element on the element that the directive represents
            var svg = d3.select(element[0]).append("svg")
                .attr("id", "svg") //give it an id so we can get it again in the future
                .append("g") //create a group that will hold the rest of the wheel
                .attr("id", "maingroup");


            var competencies = [];
            var current = [];
            var partition, arc, center, centerCircle, path, labels, data, margin, radius, width, height, borderRadius;



            //render the wheel
            scope.render = function (comps) {
                //remove all traces of the previous wheel - if there are any
                svg.selectAll('*').remove();

                //this is responsive - i.e. the wheel should change size if the browser window changes size
                //get the width of the element that contains the directive


                var containerWidth = d3.select(element[0]).node().offsetWidth;

                if (containerWidth === 0)
                    containerWidth = 500;

                //make the svg width a bit smaller than the maximum space
                width = containerWidth * sizeFactor;
                height = width; //height of the svg
                radius = getRadius(width); //the radius of the wheel
                margin = getMargin(width);
                borderRadius = width; //radius of the svg

                //set the size attributes on the svg
                d3.select("#svg")
                    .attr("width", width + "px")
                    .attr("height", height + "px")
                    .style("border-radius", borderRadius + "px");

                //move the main group to the center of the svg
                d3.select("#maingroup")
                .attr("transform", "translate(" + margin + "," + margin + ")");
                current = comps;
                competencies = comps;

                //build the wheel partitions and arcs
                partition = buildPartition();
                arc = buildArc();
                //build the central circle and set the appropiate text
                center = buildCenter();
                centerCircle = buildCenterCircle();
                setInitialCentralCircleText(current.label);
                path = buildPath();
                //setup the tool tips
                svg.call(tip);
                //set up the labels
                labels = buildLabels();
                splitText(labels);
            }

            function getMargin(theWidth) {
                return theWidth / 2;
            }

            function getRadius(theWidth) {
                return (theWidth / 2) * sizeFactor;
            }

            // Zoom to the specified new root.
            function zoom(root, competency) {
                if (document.documentElement.__transition__)
                    return;

                // Rescale outside angles to match the new layout.
                var enterArc, exitArc;
                var outsideAngle = d3.scale.linear().domain([0, 2 * Math.PI]);

                function insideArc(d) {
                    return competency.key > d.key
                        ? { depth: d.depth - 1, x: 0, dx: 0 } : competency.key < d.key
                            ? { depth: d.depth - 1, x: 2 * Math.PI, dx: 0 }
                            : { depth: 0, x: 0, dx: 2 * Math.PI };
                }

                function outsideArc(d) {
                    return { depth: d.depth, x: outsideAngle(d.x), dx: outsideAngle(d.x + d.dx) - outsideAngle(d.x) };
                }

                center.datum(root);

                // When zooming in, arcs enter from the outside and exit to the inside.
                // Entering outside arcs start from the old layout.
                if (root === competency)
                    enterArc = outsideArc, exitArc = insideArc, outsideAngle.range([competency.x, competency.x + competency.dx]);

                path = path.data(partition.nodes(root).slice(1), function (d) {
                    return d.key;
                });


                // When zooming out, arcs enter from the inside and exit to the outside.
                // Exiting outside arcs transition to the new layout.
                if (root !== competency)
                    enterArc = insideArc, exitArc = outsideArc, outsideAngle.range([competency.x, competency.x + competency.dx]);

                d3.transition().duration(transitionDuration).each(function () {
                    path.exit().transition()
                        .style("fill-opacity", function (d) {
                            return d.depth === 1 + (root === competency) ? 1 : 0;
                        })
                        .attrTween("d", function (d) {
                            return arcTween.call(this, exitArc(d));
                        })
                        .remove();

                    path.enter().append("path")
                        .attr("class", "wheelcolor")
                        .attr("id", function (d) {
                            return d.id;
                        })
                        .style("fill-opacity", function (d) {
                            return d.depth === 2 - (root === competency) ? 1 : 0;
                        })
                        .style("fill", skinData.group)
                        .on("click", zoomIn)
                        .each(function (d) {
                            this._current = enterArc(d);
                            d.path = this;
                        })
                        .on('mouseenter', function (d) {
                            tip.show(d, d.path);
                        })
                        .on('mouseleave', tip.hide);

                    path.transition()
                        .style("fill-opacity", function (d) {
                            return 1 / d.depth;
                        })
                        .attrTween("d", function (d) {
                            return arcTween.call(this, updateArc(d));
                        });

                    labels = labels.data(partition.nodes(root).filter(function (d) {
                        return d.depth === 1;
                    }), function (d) {
                        return d.key;
                    });

                    labels.enter().append("text")
                        .attr("class", "label")
                        .attr("class", "label")
                        .style("opacity", 0)
                        .style("fill", textColour)
                        .style("text-anchor", "middle")
                        .each(function (d) {
                            d3.select(this).classed("cat" + d.category, true);
                        })
                        .attr("transform", function (d) {
                            return "translate(" + arc.centroid(d) + ")";
                        })
                        .on("click", zoomIn)
                        .on('mouseenter', function (d) {
                            tip.show(d, d.path);
                        })
                        .on('mouseleave', tip.hide)
                        .text(function (d, i) {
                            return d.label.replace(/.{10}\S*\s+/g, "$&@@").split(/\s+@@/)[0];
                        });
                    splitText(labels);
                });
            }

            function setInitialCentralCircleText(text) {
                var backButtonHeight = 30;
                var backButtonWidth = 30;

                center.append("text")
                        .each(function (d) {
                            var arr = text.match(/\b[\w']+(?:[^\w\n]+[\w']+){0,1}\b/g);
                            if (arr != undefined) {
                                for (var i = 0; i < arr.length; i++) {
                                    d3.select(this).append("tspan")
                                        .text(arr[i])
                                        .attr("y", -12)
                                        .attr("dy", i + ".2em")
                                        .attr("x", 0)
                                        .attr("fill", textColour)
                                        .attr("text-anchor", "middle")
                                        .attr("id", "centertext")
                                        .attr("class", "tspan" + i);
                                }
                            }
                        });

                center.append("svg:image")
                    .attr("id", "centerbackbutton")
                    .attr("width", function (d, i) {
                        return backButtonWidth;
                    })
                    .attr("height", function (d, i) {
                        return backButtonHeight;
                    })
                    .attr("x", function (d, i) {
                        return 0 - (backButtonWidth / 2);
                    })
                    .attr("y", function (d, i) {
                        return 5;
                    })
                    .style("visibility", function (d) {
                        return "hidden";
                    })
                    .style("cursor", "pointer")
                    .attr("xlink:href", "https://uiframework.mkmapps.com/latest/lib/products/myshowcase/images/512px-Undo_font_awesome.svg.png?version=270122");
                //center.append("foreignObject")
                //    .attr("id", "centerbackbutton")
                //    .attr("width", function(d, i) {
                //        return backButtonWidth;
                //    })
                //    .attr("height", function(d, i) {
                //        return backButtonHeight;
                //    })
                //    .attr("x", function(d, i) {
                //        return 0 - (backButtonWidth / 2);
                //    })
                //    .attr("y", function(d, i) {
                //        return 5;
                //    })
                //    .style("visibility", function(d) {
                //        return "hidden";
                //    });
                //.html("<div style='color: #ffffff;cursor: pointer'><i class='fa fa-undo fa-2x'></i></div>");
            }

            function zoomIn(competency) {
                tip.hide();
                if (document.documentElement.__transition__)
                    return;
                // Find previously selected, unselect
                d3.select(".selected").classed("selected", false);

                // Select current item
                var id = "#competency" + competency.id;
                d3.select(id).attr("class", "selected");

                if (competency.depth > 1)
                    competency = competency.parent;

                if (competency.children) {
                    svg.selectAll("text.label").data([]).exit().remove();
                    zoom(competency, competency);
                    changeCenter(competency);
                }
                d3.select("#centerbackbutton")
                    .style("visibility", function (d) {
                        return "visible";
                    })
                    .on("click", function () {
                        zoomOut(current);
                    });
                scope.$apply(function () {
                    if (scope.onCompetencyClick())
                        scope.onCompetencyClick()(competency);
                });

            }

            function key(d) {
                var k = [], p = d;
                while (p.depth)
                    k.push(p.name), p = p.parent;
                return k.reverse().join(".");
            }

            function arcTween(b) {
                var i = d3.interpolate(this._current, b);
                this._current = i(0);
                return function (t) {
                    return arc(i(t));
                };
            }

            function parseCompetencies(data) {

                var root = {
                    id: data.id,
                    name: data.name,
                    description: data.description,
                    category: data.category,
                    children: parseChildren(data.childCompetencies)
                };
                return root;
            }

            function parseChildren(children) {
                var wheelChildren = [];

                if (children) {
                    children.forEach(function (child) {
                        var dynaChild = {
                            id: child.id,
                            category: child.category,
                            name: child.name,
                            description: child.description,
                            children: parseChildren(child.childCompetencies)
                        };
                        wheelChildren.push(dynaChild);
                    });
                }
                return wheelChildren;

            }

            function buildLabels() {
                return svg.selectAll("text.label")
                    .data(partition.nodes(competencies).filter(function (competency) {
                        return competency.depth === 1;
                    }))
                    .enter().append("text")
                    .attr("class", "label")
                    .style("fill", textColour)
                    .style("text-anchor", "middle")
                    .attr("transform", function (competency) {
                        return "translate(" + arc.centroid(competency) + ")";
                    })
                    .each(function (competency) {
                        d3.select(this).classed("cat" + competency.category, true);
                    })
                    .on("click", zoomIn)
                    .on('mouseenter', function (competency) {
                        tip.show(competency, competency.path);
                    })
                    .on('mouseleave', tip.hide)
                    .text(function (competency, i) {
                        return competency.label.replace(/.{10}\S*\s+/g, "$&@@").split(/\s+@@/)[0];
                    });
            }

            function splitText(newLabels) {
                if (!newLabels)
                    return;
                newLabels.append("tspan")
                    .attr("x", 0)
                    .attr("dy", "1em")
                    .text(function (d, i) {
                        return d.label.replace(/.{10}\S*\s+/g, "$&@@").split(/\s+@@/)[1];
                    });
                newLabels.append("tspan")
                    .attr("x", 0)
                    .attr("dy", "1em")
                    .text(function (d, i) {
                        return d.label.replace(/.{10}\S*\s+/g, "$&@@").split(/\s+@@/)[2];
                    });
                newLabels.transition().duration(1000).style("opacity", 1);
            }

            function zoomOut(competency) {
                tip.hide();
                if (document.documentElement.__transition__) return;
                // Find previously selected, unselect
                d3.select(".selected").classed("selected", false);

                if (competency.parent) {
                    svg.selectAll("text.label").data([]).exit().remove();
                    changeCenter(competency.parent);
                    zoom(competency.parent, competency);
                }
            }

            function changeCenter(competency) {
                current = competency;
                d3.select("#centertext")
                    .on("click", function () {
                        zoomOut(current);
                    })
                    .text(function (d) {
                        return current.label;
                    });
                d3.select("#centercircle")
                    .on("click", function () {
                        zoomOut(current);
                    });

                if (!competency.parent) {
                    d3.select("#centerbackbutton")
                    .style("visibility", function (d) {
                        return "hidden";
                    })
                    .on("click", function () {
                        zoomOut(current);
                    });
                }
            }

            function buildPath() {
                return svg.selectAll("path").data(partition.nodes(competencies).slice(1))
                    .enter().append("path")
                    .attr("d", arc)
                    .attr("class", "competency")
                    .attr("id", function (d) {
                        return "competency" + d.id;
                    })
                    .style("fill", skinData.group)
                    .style("fill-opacity", function (d) {
                        return 1 / d.depth;
                    })
                    .each(function (d) {
                        this._current = updateArc(d);
                        d.path = this;
                    })
                    .on("click", zoomIn)
                    .on('mouseenter', function (d) {
                        tip.show(d, d.path);
                    })
                    .on('mouseleave', tip.hide);
            }

            function updateArc(d) {
                return { depth: d.depth, x: d.x, dx: d.dx };
            }

            // Partition is one of d3's built in layouts. See .... for documentation.
            // Define a new partition layout. We'll sort the members alphabetically, but
            // if you don't want sorting just do .sort(none)
            function buildPartition() {
                var part = d3.layout.partition().sort(function (a, b) {
                    return d3.ascending(a.name, b.name);
                }).size([2 * Math.PI, radius]);
                // We'll work out the sum sizes for each node - nodes in the main arc (ie
                // those with a depth of 1) should be equal sizes. Because of the way the d3
                // partition layout works this means that we'll have to work out how many
                // children each competence has, and assign a value to the children of 1/by
                // that number.
                // Also compute the full name of each competence and stash the children so 
                // they can be restored as we descend.
                part.nodes(competencies).forEach(function (competency) {
                    competency._children = competency.children;
                    competency.sum = 1;
                    if (competency.depth > 1) competency.sum = 1 / Object.keys(competency.parent.children).length;
                    competency.label = competency.name;
                    competency.key = key(competency);
                });

                // Now redefine the value function to use the previously-computed sum.
                part.children(function (competency, depth) {
                    return depth < 2 ? competency._children : null;
                }).value(function (competency) {
                    return competency.sum;
                });
                return part;
            }


            function buildToolTip() {
                return d3.tip().attr('class', 'd3-tip').offset([10, 0]).html(function (competency) {
                    if (!competency)
                        competency = current;
                    return "<strong>" + (competency.name || "") + "</strong><br /><span>" + (competency.description || "") + "</span>";
                });
            }

            function buildArc() {
                return d3.svg.arc().startAngle(function (d) {
                    return d.x;
                }).endAngle(function (d) {
                    return d.x + d.dx - .01 / (d.depth + .5);
                }).innerRadius(function (d) {
                    return radius / 5 * (d.depth * 1.85);
                }).outerRadius(function (d) {
                    return radius / 5 * (d.depth + 2.6);
                });
            }

            function buildCenter() {
                center = svg.append("g");
                center.attr("transform", "translate(0,0)");
                return center;
            }

            function buildCenterCircle() {
                centerCircle = center.append("circle");
                centerCircle.attr("r", (radius / 5 * 2) - 15)
                    .attr("id", "centercircle")
                    .style("fill", skinData.root);
                return centerCircle;
            }

        }

        function getSkinData(skinName) {
            var skins = [
		{ name: 'default', colors: { root: '#1C5288', group: '#2693FF', competency: '#2693FF' } },
		{ name: 'dark', colors: { root: '#91ccff', group: '#74b3ea', competency: '#cccccc' } },
		{ name: 'cloudy', colors: { root: '#909be6', group: '#9399b7', competency: '#aaaaaa' } },
		{ name: 'leafy', colors: { root: '#719f6e', group: '#67b460', competency: '#7ec688' } },
		{ name: 'merlot', colors: { root: '#5d0d0d', group: '#be5c5c', competency: '#b99a9a' } },
		{ name: 'espresso', colors: { root: '#40341f', group: '#7c5a28', competency: '#a88a60' } },
		{ name: 'latte', colors: { root: '#a88a60', group: '#b59c78', competency: '#c1ab8c' } },
		{ name: 'nsa', colors: { root: '#0993CD', group: '#E67D00', competency: '#626250' } },
		{ name: 'nw_metro', colors: { root: '#000000', group: '#766e67', competency: '#a3c6ca' } },
		{ name: 'system', colors: { root: '#666666', group: '#b4ab0e', competency: '#666666' } },
		{ name: 'apple', colors: { root: '#7784a5', group: '#a9b5d3', competency: '#444444' } },
		{ name: 'manager', colors: { root: '#1e206b', group: '#ec008b', competency: '#00a9e0' } },
		{ name: 'database', colors: { root: '#000000', group: '#454545', competency: '#999999' } },
		{ name: 'bars', colors: { root: '#666666', group: '#888888', competency: '#aaaaaa' } },
		{ name: 'blocks', colors: { root: '#777777', group: '#999999', competency: '#bbbbbb' } },
		{ name: 'blocks_wd', colors: { root: '#777777', group: '#999999', competency: '#bbbbbb' } },
		{ name: 'blocks_wd2', colors: { root: '#777777', group: '#999999', competency: '#bbbbbb' } }
            ];
            var skinData = skins[0].colors;
            for (var a = 0; a < skins.length; a++) {
                if (skins[a].name == skinName) {
                    skinData = skins[a].colors;
                    break;
                }
            }
            return skinData;
        }
    }]);
})();