$(function(){
    function Renderer$($container) {
        var $view      = $("<canvas>").appendTo($container),
            $pfScene   = $container.children("scene");
        var renderer   = new PIXI.
                autoDetectRenderer($pfScene.attr("width"), $pfScene.attr("height"), {view: $view.get(0)}),
            dropShadow = new PIXI.filters.DropShadowFilter(),
            stage      = new PIXI.Container();

        renderer.backgroundColor = +("0x" + tinycolor("rgba(255,255,255,0)").toHex());

        dropShadow.color = "0x" + tinycolor("steelblue").toHex();
        dropShadow.angle = Math.PI / 4;
        dropShadow.blur = 8;
        dropShadow.distance = r0;
        stage.filters = [dropShadow];

        var bubbles = (function() {
            var spriteSheet, rMax,
                circles = new PIXI.Container();
            //circles.___update = updatePosition;

            stage.addChild(circles);

            function updatePosition() {
                circles.children.forEach(function(c) {
                    var d = c.__data__;
                    if(d.fixed & 2) {
                        // update the data to reflect the moved to position
                        d.x = c.position.x;
                        d.y = c.position.y;
                    } else {
                        c.position.x = d.x + dither();
                        c.position.y = d.y + dither();
                    }
                })
            }

            return {
                init: function(_rMax) {
                    rMax = _rMax
                    spriteSheet = filters.makeSpriteSheet((rMax).toFixed(), ["steelblue"])
                },
                exit: function exit($selection) {
                    // EXIT
                    var s = 0;
                    $selection.data("values").forEach(function(d, i) {
                        circles.removeChildAt(i - s++);
                    });
                    return this;
                },
                update: function() {},
                enter: function enter($selection) {
                    // ENTER
                    $selection.data("values").forEach(
                        function(d) {
                            var circle = new PIXI.Sprite(spriteSheet(d.color));
                            circle.anchor.set(0.5);
                            circle.interactive = true;
                            circle.bringToFront = bringToFront;
                            circle
                                .on("mouseover", drag.onMouseOver)
                                .on("mouseout", drag.onMouseOut)
                                // events for drag start
                                .on('mousedown', drag.onDragStart)
                                .on('touchstart', drag.onDragStart)
                                // events for drag end
                                .on('mouseup', drag.onDragEnd)
                                .on('mouseupoutside', drag.onDragEnd)
                                .on('touchend', drag.onDragEnd)
                                .on('touchendoutside', drag.onDragEnd)
                                // events for drag move
                                .on('mousemove', drag.onDragMove)
                                .on('touchmove', drag.onDragMove);
                            circles.addChild(circle)
                        }
                    );
                    return this;

                },
                merge: function b($selection) {
                    // UPDATE+ENTER
                    $selection.data("values").forEach(function(d, i) {
                        var circle = circles.children[i];
                        circle.texture = spriteSheet(d.color);
                        circle.scale.set(d.radius / rMax);
                        circle.__data__ = d;
                    });
                    circles.___update = circles.children.length ? updatePosition : null;
                    return this;
                }
            }
        })();

        var momenta = (function() {
            var lines = new PIXI.Graphics(),
                attr;
            lines.___update = updatePosition;
            stage.addChild(lines);

            function updatePosition() {
                if(!attr) return;
                lines.clear();
                lines.__data__.forEach(function(d, i) {
                    lines.lineStyle(attr("stroke-width"),
                        +("0x" + tinycolor(attr("stroke")).toHex()) || 0,
                        +attr("opacity") || 1);
                    lines.moveTo(d.x, d.y);
                    lines.lineTo(d.x - d.v.x, d.y - d.v.y);
                });
                lines.endFill();
            }

            return {
                exit: function exit($selection) {
                    lines.clear();
                    return this;
                },
                enter: function($selection) {
                    lines.clear();
                    return this;
                },
                update: function($selection) {
                },
                merge: function b($selection) {
                    var line = $selection.eq(0);
                    lines.__data__ = $selection.data("values");
                    attr = lines.__data__ ? line.attr.bind(line) : null;
                    updatePosition();
                    return this;
                }
            }
        })();

        var drag = (function(){
            var offset;
            return {
                onMouseOver: function onMouseOver(event) {
                    var d = this.__data__;
                    //toolTip.target = d;
                    d.fixed |= 4;
                    console.log([myName(arguments), d.index, "children", stage.children.length].join(": "));
                    //                        d.x = this.position.x -= d.v.x;
                    //                        d.y = this.position.y -= d.v.y;
                    this.bringToFront();
                },

                onMouseOut: function onMouseOut(event) {
                    //toolTip.target = null;
                    console.log(["\t", myName(arguments), this.index].join(": "))
                    this.__data__.fixed &= ~4;
                },

                onDragStart: function onDragStart(event) {
                    var r = this.__data__.radius;
                    offset = event.data.getLocalPosition(this);
                    offset.x *= r/r0;
                    offset.y *= r/r0;
                    console.log([myName(arguments), this.index].join(": "))
                    // store a reference to the __data__
                    // the reason for this is because of multitouch
                    // we want to track the movement of this particular touch
                    this.eventData = event.data;
                    //                        this.alpha = 0.5;
                    this.__data__.fixed |= 2;
                },

                onDragEnd: function onDragEnd() {
                    console.log(["\t", myName(arguments), this.index].join(": "))
                    this.__data__.fixed &= ~6;
                    // set the interaction data to null
                    this.eventData = null;
                },

                onDragMove: function onDragMove(event) {
                    var d;
                    if((d = this.__data__).fixed & 2) {
                        console.log([myName(arguments), this.index].join(": "));
                        var newPosition = this.eventData.getLocalPosition(this.parent);
                        d.x = d.px = this.position.x = newPosition.x - offset.x;
                        d.y = d.py = this.position.y = newPosition.y - offset.y;
                    }
                }
}
        })();

        function bringToFront() {
            var container = this.parent;
            container.swapChildren(this, container.children[container.children.length - 1]);
        }
        function dither(m) {
            return (Math.random() - 0.5) * (m || 1);
        }

        return {
            draw: function draw() {
                stage.children.forEach(function(c) {
                    if(!c.___update) return;
                    c.___update();
                });
                renderer.render(stage)
            },
            bubbles: bubbles,
            momenta: momenta,
            stage: stage
        };
    }

    function myName(args) {
        return /function\s+(\w*)\(/.exec(args.callee)[1];
    }

    var r0 = 50, width = 600, height = 300,
        data = [
            {
                radius: r0,
                color: 0
            },
            {
                radius: r0/2,
                color: 0
            },
            {
                radius: r0/2,
                color: 0
            }

        ].map(function(d, i){
                return Object.defineProperties(d,
                    {
                        v: {
                            get: function v() {
                                return {
                                    x: (Math.random() - 0.5) * r0 * 2,
                                    y: (Math.random() - 0.5) * r0 * 2
                                }
                            }
                        },
                        s: {
                            get: function s() {
                                var v = this.v;
                                return Math.sqrt(v.x * v.x + v.y * v.y)
                            }
                        },
                        x: {
                            value: width / 2 * (Math.random() + 0.5),
                            writable: true
                        },
                        y: {
                            value: height / 2 * (Math.random() + 0.5),
                            writable: true
                        }
                        ,
                        i: {
                            value: i,
                            writable: true
                        }
                    })
            }),
        $container = $("<div>").appendTo("body").attr("id", "viz"),
        $scene = $(document.createElementNS("webGL", "scene")).appendTo($container)
            .attr({"id": "scene", "width": width, "height": height }),
        $circles =  $(document.createElementNS("webGL", "circle")).appendTo($scene)
            .attr("opacity", 0.5)
            .data("values", data),
        $lines =  $(document.createElementNS("webGL", "line")).appendTo($scene)
            .attr({
                "stroke": "red",
                "stroke-width": 12,
                "stroke-linecap": "round",
                opacity: 1
            })
            .data("values", data),
        renderer = Renderer$($container);

    renderer.bubbles.init(r0);
    renderer.bubbles.enter($circles).merge($circles);
    renderer.momenta.enter($lines).merge($lines);
    function update() {
        renderer.draw();
        window.requestAnimationFrame(update)
    }
    update();
});