
define(['jquery', 'underscore', 'filesaver', 'requtils', 'renderer/miniframe'], function ($, _, filesaver, requtils, MiniFrame) {
    'use strict';

    var Utils = requtils.getUtils();

    /* Scene Begin */

    var Scene = function(_renkan) {
        this.renkan = _renkan;
        this.$ = $(".Rk-Render");
        this.representations = [];
        this.$.html(this.template(_renkan));
        this.onStatusChange();
        this.canvas_$ = this.$.find(".Rk-Canvas");
        this.labels_$ = this.$.find(".Rk-Labels");
        this.editor_$ = this.$.find(".Rk-Editor");
        this.notif_$ = this.$.find(".Rk-Notifications");
        paper.setup(this.canvas_$[0]);
        this.scale = 1;
        this.initialScale = 1;
        this.offset = paper.view.center;
        this.totalScroll = 0;
        this.mouse_down = false;
        this.click_target = null;
        this.selected_target = null;
        this.edge_layer = new paper.Layer();
        this.node_layer = new paper.Layer();
        this.buttons_layer = new paper.Layer();
        this.delete_list = [];

        if (_renkan.options.show_minimap) {
            this.minimap = {
                    background_layer: new paper.Layer(),
                    edge_layer: new paper.Layer(),
                    node_layer: new paper.Layer(),
                    node_group: new paper.Group(),
                    size: new paper.Size( _renkan.options.minimap_width, _renkan.options.minimap_height )
            };

            this.minimap.background_layer.activate();
            this.minimap.topleft = paper.view.bounds.bottomRight.subtract(this.minimap.size);
            this.minimap.rectangle = new paper.Path.Rectangle(this.minimap.topleft.subtract([2,2]), this.minimap.size.add([4,4]));
            this.minimap.rectangle.fillColor = _renkan.options.minimap_background_color;
            this.minimap.rectangle.strokeColor = _renkan.options.minimap_border_color;
            this.minimap.rectangle.strokeWidth = 4;
            this.minimap.offset = new paper.Point(this.minimap.size.divide(2));
            this.minimap.scale = 0.1;

            this.minimap.node_layer.activate();
            this.minimap.cliprectangle = new paper.Path.Rectangle(this.minimap.topleft, this.minimap.size);
            this.minimap.node_group.addChild(this.minimap.cliprectangle);
            this.minimap.node_group.clipped = true;
            this.minimap.miniframe = new paper.Path.Rectangle(this.minimap.topleft, this.minimap.size);
            this.minimap.node_group.addChild(this.minimap.miniframe);
            this.minimap.miniframe.fillColor = '#c0c0ff';
            this.minimap.miniframe.opacity = 0.3;
            this.minimap.miniframe.strokeColor = '#000080';
            this.minimap.miniframe.strokeWidth = 3;
            this.minimap.miniframe.__representation = new MiniFrame(this, null);
        }

        this.throttledPaperDraw = _(function() {
            paper.view.draw();
        }).throttle(100);

        this.bundles = [];
        this.click_mode = false;

        var _this = this,
        _allowScroll = true,
        _originalScale = 1,
        _zooming = false,
        _lastTapX = 0,
        _lastTapY = 0;

        this.image_cache = {};
        this.icon_cache = {};

        ['edit', 'remove', 'link', 'enlarge', 'shrink', 'revert' ].forEach(function(imgname) {
            var img = new Image();
            img.src = _renkan.options.static_url + 'img/' + imgname + '.png';
            _this.icon_cache[imgname] = img;
        });

        var throttledMouseMove = _.throttle(function(_event, _isTouch) {
            _this.onMouseMove(_event, _isTouch);
        }, Utils._MOUSEMOVE_RATE);

        this.canvas_$.on({
            mousedown: function(_event) {
                _event.preventDefault();
                _this.onMouseDown(_event, false);
            },
            mousemove: function(_event) {
                _event.preventDefault();
                throttledMouseMove(_event, false);
            },
            mouseup: function(_event) {
                _event.preventDefault();
                _this.onMouseUp(_event, false);
            },
            mousewheel: function(_event, _delta) {
                if(_renkan.options.zoom_on_scroll) {
                    _event.preventDefault();
                    if (_allowScroll) {
                        _this.onScroll(_event, _delta);
                    }
                }
            },
            touchstart: function(_event) {
                _event.preventDefault();
                var _touches = _event.originalEvent.touches[0];
                if (
                        _renkan.options.allow_double_click &&
                        new Date() - _lastTap < Utils._DOUBLETAP_DELAY &&
                        ( Math.pow(_lastTapX - _touches.pageX, 2) + Math.pow(_lastTapY - _touches.pageY, 2) < Utils._DOUBLETAP_DISTANCE )
                ) {
                    _lastTap = 0;
                    _this.onDoubleClick(_touches);
                } else {
                    _lastTap = new Date();
                    _lastTapX = _touches.pageX;
                    _lastTapY = _touches.pageY;
                    _originalScale = _this.scale;
                    _zooming = false;
                    _this.onMouseDown(_touches, true);
                }
            },
            touchmove: function(_event) {
                _event.preventDefault();
                _lastTap = 0;
                if (_event.originalEvent.touches.length === 1) {
                    _this.onMouseMove(_event.originalEvent.touches[0], true);
                } else {
                    if (!_zooming) {
                        _this.onMouseUp(_event.originalEvent.touches[0], true);
                        _this.click_target = null;
                        _this.is_dragging = false;
                        _zooming = true;
                    }
                    if (_event.originalEvent.scale === "undefined") {
                        return;
                    }
                    var _newScale = _event.originalEvent.scale * _originalScale,
                    _scaleRatio = _newScale / _this.scale,
                    _newOffset = new paper.Point([
                                                  _this.canvas_$.width(),
                                                  _this.canvas_$.height()
                                                  ]).multiply( 0.5 * ( 1 - _scaleRatio ) ).add(_this.offset.multiply( _scaleRatio ));
                    _this.setScale(_newScale, _newOffset);
                }
            },
            touchend: function(_event) {
                _event.preventDefault();
                _this.onMouseUp(_event.originalEvent.changedTouches[0], true);
            },
            dblclick: function(_event) {
                _event.preventDefault();
                if (_renkan.options.allow_double_click) {
                    _this.onDoubleClick(_event);
                }
            },
            mouseleave: function(_event) {
                _event.preventDefault();
                _this.onMouseUp(_event, false);
                _this.click_target = null;
                _this.is_dragging = false;
            },
            dragover: function(_event) {
                _event.preventDefault();
            },
            dragenter: function(_event) {
                _event.preventDefault();
                _allowScroll = false;
            },
            dragleave: function(_event) {
                _event.preventDefault();
                _allowScroll = true;
            },
            drop: function(_event) {
                _event.preventDefault();
                _allowScroll = true;
                var res = {};
                _(_event.originalEvent.dataTransfer.types).each(function(t) {
                    try {
                        res[t] = _event.originalEvent.dataTransfer.getData(t);
                    } catch(e) {}
                });
                var text = _event.originalEvent.dataTransfer.getData("Text");
                if (typeof text === "string") {
                    switch(text[0]) {
                    case "{":
                    case "[":
                        try {
                            var data = JSON.parse(text);
                            _(res).extend(data);
                        }
                        catch(e) {
                            if (!res["text/plain"]) {
                                res["text/plain"] = text;
                            }
                        }
                        break;
                    case "<":
                        if (!res["text/html"]) {
                            res["text/html"] = text;
                        }
                        break;
                    default:
                        if (!res["text/plain"]) {
                            res["text/plain"] = text;
                        }
                    }
                }
                var url = _event.originalEvent.dataTransfer.getData("URL");
                if (url && !res["text/uri-list"]) {
                    res["text/uri-list"] = url;
                }
                _this.dropData(res, _event.originalEvent);
            }
        });

        var bindClick = function(selector, fname) {
            _this.$.find(selector).click(function(evt) {
                _this[fname](evt);
                return false;
            });
        };

        bindClick(".Rk-ZoomOut", "zoomOut");
        bindClick(".Rk-ZoomIn", "zoomIn");
        bindClick(".Rk-ZoomFit", "autoScale");
        this.$.find(".Rk-ZoomSave").click( function() {
            // Save scale and offset point
            _this.renkan.project.addView( { zoom_level:_this.scale, offset:_this.offset } );
        });
        this.$.find(".Rk-ZoomSetSaved").click( function() {
            var view = _this.renkan.project.get("views").last();
            if(view){
                _this.setScale(view.get("zoom_level"), new paper.Point(view.get("offset")));
            }
        });
        if(this.renkan.read_only && !isNaN(parseInt(this.renkan.options.default_view))){
            this.$.find(".Rk-ZoomSetSaved").show();
        }
        this.$.find(".Rk-CurrentUser").mouseenter(
                function() { _this.$.find(".Rk-UserList").slideDown(); }
        );
        this.$.find(".Rk-Users").mouseleave(
                function() { _this.$.find(".Rk-UserList").slideUp(); }
        );
        bindClick(".Rk-FullScreen-Button", "fullScreen");
        bindClick(".Rk-AddNode-Button", "addNodeBtn");
        bindClick(".Rk-AddEdge-Button", "addEdgeBtn");
        bindClick(".Rk-Save-Button", "save");
        bindClick(".Rk-Open-Button", "open");
        bindClick(".Rk-Export-Button", "exportProject");
        this.$.find(".Rk-Bookmarklet-Button")
          /*jshint scripturl:true */
          .attr("href","javascript:" + Utils._BOOKMARKLET_CODE(_renkan))
          .click(function(){
              _this.notif_$
              .text(_renkan.translate("Drag this button to your bookmark bar. When on a third-party website, click it to enable drag-and-drop from the website to Renkan."))
              .fadeIn()
              .delay(5000)
              .fadeOut();
              return false;
          });
        this.$.find(".Rk-TopBar-Button").mouseover(function() {
            $(this).find(".Rk-TopBar-Tooltip").show();
        }).mouseout(function() {
            $(this).find(".Rk-TopBar-Tooltip").hide();
        });
        bindClick(".Rk-Fold-Bins", "foldBins");

        paper.view.onResize = function(_event) {
            // Because of paper bug which does not calculate the good height (and width a fortiori)
            // We have to update manually the canvas's height
            paper.view._viewSize.height =  _event.size.height = _this.canvas_$.parent().height();

            if (_this.minimap) {
                _this.minimap.topleft = paper.view.bounds.bottomRight.subtract(_this.minimap.size);
                _this.minimap.rectangle.fitBounds(_this.minimap.topleft.subtract([2,2]), _this.minimap.size.add([4,4]));
                _this.minimap.cliprectangle.fitBounds(_this.minimap.topleft, _this.minimap.size);
            }
            _this.redraw();
        };

        var _thRedraw = _.throttle(function() {
            _this.redraw();
        },50);

        this.addRepresentations("Node", this.renkan.project.get("nodes"));
        this.addRepresentations("Edge", this.renkan.project.get("edges"));
        this.renkan.project.on("change:title", function() {
            _this.$.find(".Rk-PadTitle").val(_renkan.project.get("title"));
        });

        this.$.find(".Rk-PadTitle").on("keyup input paste", function() {
            _renkan.project.set({"title": $(this).val()});
        });

        var _thRedrawUsers = _.throttle(function() {
            _this.redrawUsers();
        }, 100);

        _thRedrawUsers();

        // register model events
        this.renkan.project.on("add:users remove:users", _thRedrawUsers);

        this.renkan.project.on("add:views remove:views", function(_node) {
            if(_this.renkan.project.get('views').length > 0) {
                _this.$.find(".Rk-ZoomSetSaved").show();
            }
            else {
                _this.$.find(".Rk-ZoomSetSaved").hide();
            }
        });

        this.renkan.project.on("add:nodes", function(_node) {
            _this.addRepresentation("Node", _node);
            _thRedraw();
        });
        this.renkan.project.on("add:edges", function(_edge) {
            _this.addRepresentation("Edge", _edge);
            _thRedraw();
        });
        this.renkan.project.on("change:title", function(_model, _title) {
            var el = _this.$.find(".Rk-PadTitle");
            if (el.is("input")) {
                if (el.val() !== _title) {
                    el.val(_title);
                }
            } else {
                el.text(_title);
            }
        });

        if (_renkan.options.size_bug_fix) {
            var _delay = (
                    typeof _renkan.options.size_bug_fix === "number" ?
                        _renkan.options.size_bug_fix
                                : 500
            );
            window.setTimeout(
                    function() {
                        _this.fixSize(true);
                    },
                    _delay
            );
        }

        if (_renkan.options.force_resize) {
            $(window).resize(function() {
                _this.fixSize(false);
            });
        }

        if (_renkan.options.show_user_list && _renkan.options.user_color_editable) {
            var $cpwrapper = this.$.find(".Rk-Users .Rk-Edit-ColorPicker-Wrapper"),
            $cplist = this.$.find(".Rk-Users .Rk-Edit-ColorPicker");

            $cpwrapper.hover(
                    function(_e) {
                        if (_this.isEditable()) {
                            _e.preventDefault();
                            $cplist.show();
                        }
                    },
                    function(_e) {
                        _e.preventDefault();
                        $cplist.hide();
                    }
            );

            $cplist.find("li").mouseenter(
                    function(_e) {
                        if (_this.isEditable()) {
                            _e.preventDefault();
                            _this.$.find(".Rk-CurrentUser-Color").css("background", $(this).attr("data-color"));
                        }
                    }
            );
        }

        if (_renkan.options.show_search_field) {

            var lastval = '';

            this.$.find(".Rk-GraphSearch-Field").on("keyup change paste input", function() {
                var $this = $(this),
                val = $this.val();
                if (val === lastval) {
                    return;
                }
                lastval = val;
                if (val.length < 2) {
                    _renkan.project.get("nodes").each(function(n) {
                        _this.getRepresentationByModel(n).unhighlight();
                    });
                } else {
                    var rxs = Utils.regexpFromTextOrArray(val);
                    _renkan.project.get("nodes").each(function(n) {
                        if (rxs.test(n.get("title")) || rxs.test(n.get("description"))) {
                            _this.getRepresentationByModel(n).highlight(rxs);
                        } else {
                            _this.getRepresentationByModel(n).unhighlight();
                        }
                    });
                }
            });
        }

        this.redraw();

        window.setInterval(function() {
            var _now = new Date().valueOf();
            _this.delete_list.forEach(function(d) {
                if (_now >= d.time) {
                    var el = _renkan.project.get("nodes").findWhere({"delete_scheduled":d.id});
                    if (el) {
                        project.removeNode(el);
                    }
                    el = _renkan.project.get("edges").findWhere({"delete_scheduled":d.id});
                    if (el) {
                        project.removeEdge(el);
                    }
                }
            });
            _this.delete_list = _this.delete_list.filter(function(d) {
                return _renkan.project.get("nodes").findWhere({"delete_scheduled":d.id}) || _renkan.project.get("edges").findWhere({"delete_scheduled":d.id});
            });
        }, 500);

        if (this.minimap) {
            window.setInterval(function() {
                _this.rescaleMinimap();
            }, 2000);
        }

    };

    _(Scene.prototype).extend({
        template: _.template(
                '<% if (options.show_top_bar) { %><div class="Rk-TopBar"><% if (!options.editor_mode) { %><h2 class="Rk-PadTitle"><%- project.get("title") || translate("Untitled project")%></h2>' +
                '<% } else { %><input type="text" class="Rk-PadTitle" value="<%- project.get("title") || "" %>" placeholder="<%-translate("Untitled project")%>" /><% } %>' +
                '<% if (options.show_user_list) { %><div class="Rk-Users"><div class="Rk-CurrentUser"><div class="Rk-Edit-ColorPicker-Wrapper"><span class="Rk-CurrentUser-Color"><% if (options.user_color_editable) { %><span class="Rk-Edit-ColorTip"></span><% } %></span>' +
                '<% if (options.user_color_editable) { print(colorPicker) } %></div><span class="Rk-CurrentUser-Name">&lt;unknown user&gt;</span></div><ul class="Rk-UserList"></ul></div><% } %>' +
                '<% if (options.home_button_url) {%><div class="Rk-TopBar-Separator"></div><a class="Rk-TopBar-Button Rk-Home-Button" href="<%- options.home_button_url %>"><div class="Rk-TopBar-Tooltip"><div class="Rk-TopBar-Tooltip-Contents">' +
                '<%- translate(options.home_button_title) %></div></div></a><% } %>' +
                '<% if (options.show_fullscreen_button) { %><div class="Rk-TopBar-Separator"></div><div class="Rk-TopBar-Button Rk-FullScreen-Button"><div class="Rk-TopBar-Tooltip"><div class="Rk-TopBar-Tooltip-Contents"><%-translate("Full Screen")%></div></div></div><% } %>' +
                '<% if (options.editor_mode) { %>' +
                '<% if (options.show_addnode_button) { %><div class="Rk-TopBar-Separator"></div><div class="Rk-TopBar-Button Rk-AddNode-Button"><div class="Rk-TopBar-Tooltip">' +
                '<div class="Rk-TopBar-Tooltip-Contents"><%-translate("Add Node")%></div></div></div><% } %>' +
                '<% if (options.show_addedge_button) { %><div class="Rk-TopBar-Separator"></div><div class="Rk-TopBar-Button Rk-AddEdge-Button"><div class="Rk-TopBar-Tooltip">' +
                '<div class="Rk-TopBar-Tooltip-Contents"><%-translate("Add Edge")%></div></div></div><% } %>' +
                '<% if (options.show_export_button) { %><div class="Rk-TopBar-Separator"></div><div class="Rk-TopBar-Button Rk-Export-Button"><div class="Rk-TopBar-Tooltip"><div class="Rk-TopBar-Tooltip-Contents"><%-translate("Download Project")%></div></div></div><% } %>' +
                '<% if (options.show_save_button) { %><div class="Rk-TopBar-Separator"></div><div class="Rk-TopBar-Button Rk-Save-Button"><div class="Rk-TopBar-Tooltip"><div class="Rk-TopBar-Tooltip-Contents"> </div></div></div><% } %>' +
                '<% if (options.show_open_button) { %><div class="Rk-TopBar-Separator"></div><div class="Rk-TopBar-Button Rk-Open-Button"><div class="Rk-TopBar-Tooltip"><div class="Rk-TopBar-Tooltip-Contents"><%-translate("Open Project")%></div></div></div><% } %>' +
                '<% if (options.show_bookmarklet) { %><div class="Rk-TopBar-Separator"></div><a class="Rk-TopBar-Button Rk-Bookmarklet-Button" href="#"><div class="Rk-TopBar-Tooltip"><div class="Rk-TopBar-Tooltip-Contents">' +
                '<%-translate("Renkan \'Drag-to-Add\' bookmarklet")%></div></div></a><% } %>' +
                '<% } else { %>' +
                '<% if (options.show_export_button) { %><div class="Rk-TopBar-Separator"></div><div class="Rk-TopBar-Button Rk-Export-Button"><div class="Rk-TopBar-Tooltip"><div class="Rk-TopBar-Tooltip-Contents"><%-translate("Download Project")%></div></div></div><div class="Rk-TopBar-Separator"></div><% } %>' +
                '<% };' +
                'if (options.show_search_field) { %>' +
                '<form action="#" class="Rk-GraphSearch-Form"><input type="search" class="Rk-GraphSearch-Field" placeholder="<%- translate("Search in graph") %>" /></form><div class="Rk-TopBar-Separator"></div><% } %></div><% } %>' +
                '<div class="Rk-Editing-Space<% if (!options.show_top_bar) { %> Rk-Editing-Space-Full<% } %>">' +
                '<div class="Rk-Labels"></div><canvas class="Rk-Canvas" resize></canvas><div class="Rk-Notifications"></div><div class="Rk-Editor">' +
                '<% if (options.show_bins) { %><div class="Rk-Fold-Bins">&laquo;</div><% } %>' +
                '<div class="Rk-ZoomButtons"><div class="Rk-ZoomIn" title="<%-translate("Zoom In")%>"></div><div class="Rk-ZoomFit" title="<%-translate("Zoom Fit")%>"></div><div class="Rk-ZoomOut" title="<%-translate("Zoom Out")%>"></div>' +
                '<% if (options.editor_mode) { %><div class="Rk-ZoomSave" title="<%-translate("Zoom Save")%>"></div><% } %>' +
                '<% if (options.editor_mode || !isNaN(parseInt(options.default_view))) { %><div class="Rk-ZoomSetSaved" title="<%-translate("View saved zoom")%>"></div><% } %></div>' +
                '</div></div>'
        ),
        fixSize: function(_autoscale) {
            var w = this.$.width(),
            h = this.$.height();
            if (this.renkan.options.show_top_bar) {
                h -= this.$.find(".Rk-TopBar").height();
            }
            this.canvas_$.attr({
                width: w,
                height: h
            });

            paper.view.viewSize = new paper.Size([w, h]);

            if (_autoscale) {
                // If _autoscale, we get the initial view (zoom+offset) set in the project datas.
                if(this.renkan.read_only && !isNaN(parseInt(this.renkan.options.default_view))){
                    this.autoScale(this.renkan.project.get("views")[parseInt(this.renkan.options.default_view)]);
                }
                else{
                    this.autoScale();
                }
            }
        },
        drawSector: function(_repr, _inR, _outR, _startAngle, _endAngle, _padding, _imgname, _caption) {
            var _options = this.renkan.options,
            _startRads = _startAngle * Math.PI / 180,
            _endRads = _endAngle * Math.PI / 180,
            _img = this.icon_cache[_imgname],
            _startdx = - Math.sin(_startRads),
            _startdy = Math.cos(_startRads),
            _startXIn = Math.cos(_startRads) * _inR + _padding * _startdx,
            _startYIn = Math.sin(_startRads) * _inR + _padding * _startdy,
            _startXOut = Math.cos(_startRads) * _outR + _padding * _startdx,
            _startYOut = Math.sin(_startRads) * _outR + _padding * _startdy,
            _enddx = - Math.sin(_endRads),
            _enddy = Math.cos(_endRads),
            _endXIn = Math.cos(_endRads) * _inR - _padding * _enddx,
            _endYIn = Math.sin(_endRads) * _inR - _padding * _enddy,
            _endXOut = Math.cos(_endRads) * _outR - _padding * _enddx,
            _endYOut = Math.sin(_endRads) * _outR - _padding * _enddy,
            _centerR = (_inR + _outR) / 2,
            _centerRads = (_startRads + _endRads) / 2,
            _centerX = Math.cos(_centerRads) * _centerR,
            _centerY = Math.sin(_centerRads) * _centerR,
            _centerXIn = Math.cos(_centerRads) * _inR,
            _centerXOut = Math.cos(_centerRads) * _outR,
            _centerYIn = Math.sin(_centerRads) * _inR,
            _centerYOut = Math.sin(_centerRads) * _outR,
            _textX = Math.cos(_centerRads) * (_outR + 3),
            _textY = Math.sin(_centerRads) * (_outR + _options.buttons_label_font_size) + _options.buttons_label_font_size / 2;
            this.buttons_layer.activate();
            var _path = new paper.Path();
            _path.add([_startXIn, _startYIn]);
            _path.arcTo([_centerXIn, _centerYIn], [_endXIn, _endYIn]);
            _path.lineTo([_endXOut,  _endYOut]);
            _path.arcTo([_centerXOut, _centerYOut], [_startXOut, _startYOut]);
            _path.fillColor = _options.buttons_background;
            _path.opacity = 0.5;
            _path.closed = true;
            _path.__representation = _repr;
            var _text = new paper.PointText(_textX,_textY);
            _text.characterStyle = {
                    fontSize: _options.buttons_label_font_size,
                    fillColor: _options.buttons_label_color
            };
            if (_textX > 2) {
                _text.paragraphStyle.justification = 'left';
            } else if (_textX < -2) {
                _text.paragraphStyle.justification = 'right';
            } else {
                _text.paragraphStyle.justification = 'center';
            }
            _text.visible = false;
            var _visible = false,
            _restPos = new paper.Point(-200, -200),
            _grp = new paper.Group([_path, _text]),
            _delta = _grp.position,
            _imgdelta = new paper.Point([_centerX, _centerY]),
            _currentPos = new paper.Point(0,0);
            _text.content = _caption;
            _grp.visible = false;
            _grp.position = _restPos;
            var _res = {
                    show: function() {
                        _visible = true;
                        _grp.position = _currentPos.add(_delta);
                        _grp.visible = true;
                    },
                    moveTo: function(_point) {
                        _currentPos = _point;
                        if (_visible) {
                            _grp.position = _point.add(_delta);
                        }
                    },
                    hide: function() {
                        _visible = false;
                        _grp.visible = false;
                        _grp.position = _restPos;
                    },
                    select: function() {
                        _path.opacity = 0.8;
                        _text.visible = true;
                    },
                    unselect: function() {
                        _path.opacity = 0.5;
                        _text.visible = false;
                    },
                    destroy: function() {
                        _grp.remove();
                    }
            };
            var showImage = function() {
                var _raster = new paper.Raster(_img);
                _raster.position = _imgdelta.add(_grp.position).subtract(_delta);
                _raster.locked = true; // Disable mouse events on icon
                _grp.addChild(_raster);
            };
            if (_img.width) {
                showImage();
            } else {
                $(_img).on("load",showImage);
            }

            return _res;
        },
        addToBundles: function(_edgeRepr) {
            var _bundle = _(this.bundles).find(function(_bundle) {
                return (
                        ( _bundle.from === _edgeRepr.from_representation && _bundle.to === _edgeRepr.to_representation ) ||
                        ( _bundle.from === _edgeRepr.to_representation && _bundle.to === _edgeRepr.from_representation )
                );
            });
            if (typeof _bundle !== "undefined") {
                _bundle.edges.push(_edgeRepr);
            } else {
                _bundle = {
                        from: _edgeRepr.from_representation,
                        to: _edgeRepr.to_representation,
                        edges: [ _edgeRepr ],
                        getPosition: function(_er) {
                            var _dir = (_er.from_representation === this.from) ? 1 : -1;
                            return _dir * ( _(this.edges).indexOf(_er) - (this.edges.length - 1) / 2 );
                        }
                };
                this.bundles.push(_bundle);
            }
            return _bundle;
        },
        isEditable: function() {
            return (this.renkan.options.editor_mode && !this.renkan.read_only);
        },
        onStatusChange: function() {
            var savebtn = this.$.find(".Rk-Save-Button"),
            tip = savebtn.find(".Rk-TopBar-Tooltip-Contents");
            if (this.renkan.read_only) {
                savebtn.removeClass("disabled Rk-Save-Online").addClass("Rk-Save-ReadOnly");
                tip.text(this.renkan.translate("Connection lost"));
            } else {
                if (this.renkan.options.snapshot_mode) {
                    savebtn.removeClass("Rk-Save-ReadOnly Rk-Save-Online");
                    tip.text(this.renkan.translate("Save Project"));
                } else {
                    savebtn.removeClass("disabled Rk-Save-ReadOnly").addClass("Rk-Save-Online");
                    tip.text(this.renkan.translate("Auto-save enabled"));
                }
            }
            this.redrawUsers();
        },
        setScale: function(_newScale, _offset) {
            if ((_newScale/this.initialScale) > Utils._MIN_SCALE && (_newScale/this.initialScale) < Utils._MAX_SCALE) {
                this.scale = _newScale;
                if (_offset) {
                    this.offset = _offset;
                }
                this.redraw();
            }
        },
        autoScale: function(force_view) {
            var nodes = this.renkan.project.get("nodes");
            if (nodes.length > 1) {
                var _xx = nodes.map(function(_node) { return _node.get("position").x; }),
                _yy = nodes.map(function(_node) { return _node.get("position").y; }),
                _minx = Math.min.apply(Math, _xx),
                _miny = Math.min.apply(Math, _yy),
                _maxx = Math.max.apply(Math, _xx),
                _maxy = Math.max.apply(Math, _yy);
                var _scale = Math.min( (paper.view.size.width - 2 * this.renkan.options.autoscale_padding) / (_maxx - _minx), (paper.view.size.height - 2 * this.renkan.options.autoscale_padding) / (_maxy - _miny));
                this.initialScale = _scale;
                // Override calculated scale if asked
                if((typeof force_view !== "undefined") && parseFloat(force_view.zoom_level)>0 && parseFloat(force_view.offset.x)>0 && parseFloat(force_view.offset.y)>0){
                    this.setScale(parseFloat(force_view.zoom_level), new paper.Point(parseFloat(force_view.offset.x), parseFloat(force_view.offset.y)));
                }
                else{
                    this.setScale(_scale, paper.view.center.subtract(new paper.Point([(_maxx + _minx) / 2, (_maxy + _miny) / 2]).multiply(_scale)));
                }
            }
            if (nodes.length === 1) {
                this.setScale(1, paper.view.center.subtract(new paper.Point([nodes.at(0).get("position").x, nodes.at(0).get("position").y])));
            }
        },
        redrawMiniframe: function() {
            var topleft = this.toMinimapCoords(this.toModelCoords(new paper.Point([0,0]))),
            bottomright = this.toMinimapCoords(this.toModelCoords(paper.view.bounds.bottomRight));
            this.minimap.miniframe.fitBounds(topleft, bottomright);
        },
        rescaleMinimap: function() {
            var nodes = this.renkan.project.get("nodes");
            if (nodes.length > 1) {
                var _xx = nodes.map(function(_node) { return _node.get("position").x; }),
                _yy = nodes.map(function(_node) { return _node.get("position").y; }),
                _minx = Math.min.apply(Math, _xx),
                _miny = Math.min.apply(Math, _yy),
                _maxx = Math.max.apply(Math, _xx),
                _maxy = Math.max.apply(Math, _yy);
                var _scale = Math.min(
                        this.scale * 0.8 * this.renkan.options.minimap_width / paper.view.bounds.width,
                        this.scale * 0.8 * this.renkan.options.minimap_height / paper.view.bounds.height,
                        ( this.renkan.options.minimap_width - 2 * this.renkan.options.minimap_padding ) / (_maxx - _minx),
                        ( this.renkan.options.minimap_height - 2 * this.renkan.options.minimap_padding ) / (_maxy - _miny)
                );
                this.minimap.offset = this.minimap.size.divide(2).subtract(new paper.Point([(_maxx + _minx) / 2, (_maxy + _miny) / 2]).multiply(_scale));
                this.minimap.scale = _scale;
            }
            if (nodes.length === 1) {
                this.minimap.scale = 0.1;
                this.minimap.offset = this.minimap.size.divide(2).subtract(new paper.Point([nodes.at(0).get("position").x, nodes.at(0).get("position").y]).multiply(this.minimap.scale));
            }
            this.redraw();
        },
        toPaperCoords: function(_point) {
            return _point.multiply(this.scale).add(this.offset);
        },
        toMinimapCoords: function(_point) {
            return _point.multiply(this.minimap.scale).add(this.minimap.offset).add(this.minimap.topleft);
        },
        toModelCoords: function(_point) {
            return _point.subtract(this.offset).divide(this.scale);
        },
        addRepresentation: function(_type, _model) {
            var RendererType = requtils.getRenderer()[_type];
            var _repr = new RendererType(this, _model);
            this.representations.push(_repr);
            return _repr;
        },
        addRepresentations: function(_type, _collection) {
            var _this = this;
            _collection.forEach(function(_model) {
                _this.addRepresentation(_type, _model);
            });
        },
        userTemplate: _.template(
                '<li class="Rk-User"><span class="Rk-UserColor" style="background:<%=background%>;"></span><%=name%></li>'
        ),
        redrawUsers: function() {
            if (!this.renkan.options.show_user_list) {
                return;
            }
            var allUsers = [].concat((this.renkan.project.current_user_list || {}).models || [], (this.renkan.project.get("users") || {}).models || []),
            ulistHtml = '',
            $userpanel = this.$.find(".Rk-Users"),
            $name = $userpanel.find(".Rk-CurrentUser-Name"),
            $cpitems = $userpanel.find(".Rk-Edit-ColorPicker li"),
            $colorsquare = $userpanel.find(".Rk-CurrentUser-Color"),
            _this = this;
            $name.off("click").text(this.renkan.translate("<unknown user>"));
            $cpitems.off("mouseleave click");
            allUsers.forEach(function(_user) {
                if (_user.get("_id") === _this.renkan.current_user) {
                    $name.text(_user.get("title"));
                    $colorsquare.css("background", _user.get("color"));
                    if (_this.isEditable()) {

                        if (_this.renkan.options.user_name_editable) {
                            $name.click(function() {
                                var $this = $(this),
                                $input = $('<input>').val(_user.get("title")).blur(function() {
                                    _user.set("title", $(this).val());
                                    _this.redrawUsers();
                                    _this.redraw();
                                });
                                $this.empty().html($input);
                                $input.select();
                            });
                        }

                        if (_this.renkan.options.user_color_editable) {
                            $cpitems.click(
                                    function(_e) {
                                        _e.preventDefault();
                                        if (_this.isEditable()) {
                                            _user.set("color", $(this).attr("data-color"));
                                        }
                                        $(this).parent().hide();
                                    }
                            ).mouseleave(function() {
                                $colorsquare.css("background", _user.get("color"));
                            });
                        }
                    }

                } else {
                    ulistHtml += _this.userTemplate({
                        name: _user.get("title"),
                        background: _user.get("color")
                    });
                }
            });
            $userpanel.find(".Rk-UserList").html(ulistHtml);
        },
        removeRepresentation: function(_representation) {
            _representation.destroy();
            this.representations = _(this.representations).reject(
                    function(_repr) {
                        return _repr === _representation;
                    }
            );
        },
        getRepresentationByModel: function(_model) {
            if (!_model) {
                return undefined;
            }
            return _(this.representations).find(function(_repr) {
                return _repr.model === _model;
            });
        },
        removeRepresentationsOfType: function(_type) {
            var _representations = _(this.representations).filter(function(_repr) {
                return _repr.type === _type;
            }),
            _this = this;
            _(_representations).each(function(_repr) {
                _this.removeRepresentation(_repr);
            });
        },
        highlightModel: function(_model) {
            var _repr = this.getRepresentationByModel(_model);
            if (_repr) {
                _repr.highlight();
            }
        },
        unhighlightAll: function(_model) {
            _(this.representations).each(function(_repr) {
                _repr.unhighlight();
            });
        },
        unselectAll: function(_model) {
            _(this.representations).each(function(_repr) {
                _repr.unselect();
            });
        },
        redraw: function() {
            _(this.representations).each(function(_representation) {
                _representation.redraw(true);
            });
            if (this.minimap) {
                this.redrawMiniframe();
            }
            paper.view.draw();
        },
        addTempEdge: function(_from, _point) {
            var _tmpEdge = this.addRepresentation("TempEdge",null);
            _tmpEdge.end_pos = _point;
            _tmpEdge.from_representation = _from;
            _tmpEdge.redraw();
            this.click_target = _tmpEdge;
        },
        findTarget: function(_hitResult) {
            if (_hitResult && typeof _hitResult.item.__representation !== "undefined") {
                var _newTarget = _hitResult.item.__representation;
                if (this.selected_target !== _hitResult.item.__representation) {
                    if (this.selected_target) {
                        this.selected_target.unselect(_newTarget);
                    }
                    _newTarget.select(this.selected_target);
                    this.selected_target = _newTarget;
                }
            } else {
                if (this.selected_target) {
                    this.selected_target.unselect();
                }
                this.selected_target = null;
            }
        },
        paperShift: function(_delta) {
            this.offset = this.offset.add(_delta);
            this.redraw();
        },
        onMouseMove: function(_event) {
            var _off = this.canvas_$.offset(),
            _point = new paper.Point([
                                      _event.pageX - _off.left,
                                      _event.pageY - _off.top
                                      ]),
                                      _delta = _point.subtract(this.last_point);
            this.last_point = _point;
            if (!this.is_dragging && this.mouse_down && _delta.length > Utils._MIN_DRAG_DISTANCE) {
                this.is_dragging = true;
            }
            var _hitResult = paper.project.hitTest(_point);
            if (this.is_dragging) {
                if (this.click_target && typeof this.click_target.paperShift === "function") {
                    this.click_target.paperShift(_delta);
                } else {
                    this.paperShift(_delta);
                }
            } else {
                this.findTarget(_hitResult);
            }
            paper.view.draw();
        },
        onMouseDown: function(_event, _isTouch) {
            var _off = this.canvas_$.offset(),
            _point = new paper.Point([
                                      _event.pageX - _off.left,
                                      _event.pageY - _off.top
                                      ]);
            this.last_point = _point;
            this.mouse_down = true;
            if (!this.click_target || this.click_target.type !== "Temp-edge") {
                this.removeRepresentationsOfType("editor");
                this.is_dragging = false;
                var _hitResult = paper.project.hitTest(_point);
                if (_hitResult && typeof _hitResult.item.__representation !== "undefined") {
                    this.click_target = _hitResult.item.__representation;
                    this.click_target.mousedown(_event, _isTouch);
                } else {
                    this.click_target = null;
                    if (this.isEditable() && this.click_mode === Utils._CLICKMODE_ADDNODE) {
                        var _coords = this.toModelCoords(_point),
                        _data = {
                            id: Utils.getUID('node'),
                            created_by: this.renkan.current_user,
                            position: {
                                x: _coords.x,
                                y: _coords.y
                            }
                        };
                        _node = this.renkan.project.addNode(_data);
                        this.getRepresentationByModel(_node).openEditor();
                    }
                }
            }
            if (this.click_mode) {
                if (this.isEditable() && this.click_mode === Utils._CLICKMODE_STARTEDGE && this.click_target && this.click_target.type === "Node") {
                    this.removeRepresentationsOfType("editor");
                    this.addTempEdge(this.click_target, _point);
                    this.click_mode = Utils._CLICKMODE_ENDEDGE;
                    this.notif_$.fadeOut(function() {
                        $(this).html(this.renkan.translate("Click on a second node to complete the edge")).fadeIn();
                    });
                } else {
                    this.notif_$.hide();
                    this.click_mode = false;
                }
            }
            paper.view.draw();
        },
        onMouseUp: function(_event, _isTouch) {
            this.mouse_down = false;
            if (this.click_target) {
                var _off = this.canvas_$.offset();
                this.click_target.mouseup(
                        {
                            point: new paper.Point([
                                                    _event.pageX - _off.left,
                                                    _event.pageY - _off.top
                                                    ])
                        },
                        _isTouch
                );
            } else {
                this.click_target = null;
                this.is_dragging = false;
                if (_isTouch) {
                    this.unselectAll();
                }
            }
            paper.view.draw();
        },
        onScroll: function(_event, _scrolldelta) {
            this.totalScroll += _scrolldelta;
            if (Math.abs(this.totalScroll) >= 1) {
                var _off = this.canvas_$.offset(),
                _delta = new paper.Point([
                                          _event.pageX - _off.left,
                                          _event.pageY - _off.top
                                          ]).subtract(this.offset).multiply( Math.SQRT2 - 1 );
                if (this.totalScroll > 0) {
                    this.setScale( this.scale * Math.SQRT2, this.offset.subtract(_delta) );
                } else {
                    this.setScale( this.scale * Math.SQRT1_2, this.offset.add(_delta.divide(Math.SQRT2)));
                }
                this.totalScroll = 0;
            }
        },
        onDoubleClick: function(_event) {
            if (!this.isEditable()) {
                return;
            }
            var _off = this.canvas_$.offset(),
            _point = new paper.Point([
                                      _event.pageX - _off.left,
                                      _event.pageY - _off.top
                                      ]);
            var _hitResult = paper.project.hitTest(_point);
            if (this.isEditable() && (!_hitResult || typeof _hitResult.item.__representation === "undefined")) {
                var _coords = this.toModelCoords(_point),
                _data = {
                    id: Utils.getUID('node'),
                    created_by: this.renkan.current_user,
                    position: {
                        x: _coords.x,
                        y: _coords.y
                    }
                },
                _node = this.renkan.project.addNode(_data);
                this.getRepresentationByModel(_node).openEditor();
            }
            paper.view.draw();
        },
        defaultDropHandler: function(_data) {
            var newNode = {};
            var snippet = "";
            switch(_data["text/x-iri-specific-site"]) {
                case "twitter":
                    snippet = $('<div>').html(_data["text/x-iri-selected-html"]);
                    var tweetdiv = snippet.find(".tweet");
                    newNode.title = this.renkan.translate("Tweet by ") + tweetdiv.attr("data-name");
                    newNode.uri = "http://twitter.com/" + tweetdiv.attr("data-screen-name") + "/status/" + tweetdiv.attr("data-tweet-id");
                    newNode.image = tweetdiv.find(".avatar").attr("src");
                    newNode.description = tweetdiv.find(".js-tweet-text:first").text();
                    break;
                case "google":
                    snippet = $('<div>').html(_data["text/x-iri-selected-html"]);
                    newNode.title = snippet.find("h3:first").text().trim();
                    newNode.uri = snippet.find("h3 a").attr("href");
                    newNode.description = snippet.find(".st:first").text().trim();
                    break;
                default:
                    if (_data["text/x-iri-source-uri"]) {
                        newNode.uri = _data["text/x-iri-source-uri"];
                    }
            }
            if (_data["text/plain"] || _data["text/x-iri-selected-text"]) {
                newNode.description = (_data["text/plain"] || _data["text/x-iri-selected-text"]).replace(/[\s\n]+/gm,' ').trim();
            }
            if (_data["text/html"] || _data["text/x-iri-selected-html"]) {
                snippet = $('<div>').html(_data["text/html"] || _data["text/x-iri-selected-html"]);
                var _svgimgs = snippet.find("image");
                if (_svgimgs.length) {
                    newNode.image = _svgimgs.attr("xlink:href");
                }
                var _svgpaths = snippet.find("path");
                if (_svgpaths.length) {
                    newNode.clipPath = _svgpaths.attr("d");
                }
                var _imgs = snippet.find("img");
                if (_imgs.length) {
                    newNode.image = _imgs[0].src;
                }
                var _as = snippet.find("a");
                if (_as.length) {
                    newNode.uri = _as[0].href;
                }
                newNode.title = snippet.find("[title]").attr("title") || newNode.title;
                newNode.description = snippet.text().replace(/[\s\n]+/gm,' ').trim();
            }
            if (_data["text/uri-list"]) {
                newNode.uri = _data["text/uri-list"];
            }
            if (_data["text/x-moz-url"] && !newNode.title) {
                newNode.title = (_data["text/x-moz-url"].split("\n")[1] || "").trim();
                if (newNode.title === newNode.uri) {
                    newNode.title = false;
                }
            }
            if (_data["text/x-iri-source-title"] && !newNode.title) {
                newNode.title = _data["text/x-iri-source-title"];
            }
            if (_data["text/html"] || _data["text/x-iri-selected-html"]) {
                snippet = $('<div>').html(_data["text/html"] || _data["text/x-iri-selected-html"]);
                newNode.image = snippet.find("[data-image]").attr("data-image") || newNode.image;
                newNode.uri = snippet.find("[data-uri]").attr("data-uri") || newNode.uri;
                newNode.title = snippet.find("[data-title]").attr("data-title") || newNode.title;
                newNode.description = snippet.find("[data-description]").attr("data-description") || newNode.description;
                newNode.clipPath = snippet.find("[data-clip-path]").attr("data-clip-path") || newNode.clipPath;
            }

            if (!newNode.title) {
                newNode.title = this.renkan.translate("Dragged resource");
            }
            var fields = ["title", "description", "uri", "image"];
            for (var i = 0; i < fields.length; i++) {
                var f = fields[i];
                if (_data["text/x-iri-" + f] || _data[f]) {
                    newNode[f] = _data["text/x-iri-" + f] || _data[f];
                }
                if (newNode[f] === "none" || newNode[f] === "null") {
                    newNode[f] = undefined;
                }
            }

            if(typeof this.renkan.options.drop_enhancer === "function"){
                newNode = this.renkan.options.drop_enhancer(newNode, _data);
            }

            return newNode;

        },
        dropData: function(_data, _event) {
            if (!this.isEditable()) {
                return;
            }
            if (_data["text/json"] || _data["application/json"]) {
                try {
                    var jsondata = JSON.parse(_data["text/json"] || _data["application/json"]);
                    _(_data).extend(jsondata);
                }
                catch(e) {}
            }

            var newNode = (typeof this.renkan.options.drop_handler === "undefined")?this.defaultDropHandler(_data):this.renkan.options.drop_handler(_data);

            var _off = this.canvas_$.offset(),
            _point = new paper.Point([
                                      _event.pageX - _off.left,
                                      _event.pageY - _off.top
                                      ]),
                                      _coords = this.toModelCoords(_point),
                                      _nodedata = {
                id: Utils.getUID('node'),
                created_by: this.renkan.current_user,
                uri: newNode.uri || "",
                title: newNode.title || "",
                description: newNode.description || "",
                image: newNode.image || "",
                color: newNode.color || undefined,
                clip_path: newNode.clipPath || undefined,
                position: {
                    x: _coords.x,
                    y: _coords.y
                }
            };
            var _node = this.renkan.project.addNode(_nodedata),
            _repr = this.getRepresentationByModel(_node);
            if (_event.type === "drop") {
                _repr.openEditor();
            }
        },
        fullScreen: function() {
            var _isFull = document.fullScreen || document.mozFullScreen || document.webkitIsFullScreen,
              _el = this.renkan.$[0],
              _requestMethods = ["requestFullScreen","mozRequestFullScreen","webkitRequestFullScreen"],
              _cancelMethods = ["cancelFullScreen","mozCancelFullScreen","webkitCancelFullScreen"],
              i;
            if (_isFull) {
                for (i = 0; i < _cancelMethods.length; i++) {
                    if (typeof document[_cancelMethods[i]] === "function") {
                        document[_cancelMethods[i]]();
                        break;
                    }
                }
            } else {
                for (i = 0; i < _requestMethods.length; i++) {
                    if (typeof _el[_requestMethods[i]] === "function") {
                        _el[_requestMethods[i]]();
                        break;
                    }
                }
            }
        },
        zoomOut: function() {
            var _newScale = this.scale * Math.SQRT1_2,
            _offset = new paper.Point([
                                       this.canvas_$.width(),
                                       this.canvas_$.height()
                                       ]).multiply( 0.5 * ( 1 - Math.SQRT1_2 ) ).add(this.offset.multiply( Math.SQRT1_2 ));
            this.setScale( _newScale, _offset );
        },
        zoomIn: function() {
            var _newScale = this.scale * Math.SQRT2,
            _offset = new paper.Point([
                                       this.canvas_$.width(),
                                       this.canvas_$.height()
                                       ]).multiply( 0.5 * ( 1 - Math.SQRT2 ) ).add(this.offset.multiply( Math.SQRT2 ));
            this.setScale( _newScale, _offset );
        },
        addNodeBtn: function() {
            if (this.click_mode === Utils._CLICKMODE_ADDNODE) {
                this.click_mode = false;
                this.notif_$.hide();
            } else {
                this.click_mode = Utils._CLICKMODE_ADDNODE;
                this.notif_$.text(this.renkan.translate("Click on the background canvas to add a node")).fadeIn();
            }
            return false;
        },
        addEdgeBtn: function() {
            if (this.click_mode === Utils._CLICKMODE_STARTEDGE || this.click_mode === Utils._CLICKMODE_ENDEDGE) {
                this.click_mode = false;
                this.notif_$.hide();
            } else {
                this.click_mode = Utils._CLICKMODE_STARTEDGE;
                this.notif_$.text(this.renkan.translate("Click on a first node to start the edge")).fadeIn();
            }
            return false;
        },
        exportProject: function() {
          var projectJSON = this.renkan.project.toJSON(),
              downloadLink = document.createElement("a"),
              projectId = projectJSON.id,
              fileNameToSaveAs = projectId + ".json";

          // clean ids
          delete projectJSON.id;
          delete projectJSON._id;
          delete projectJSON.space_id;

          var objId;
          var idsMap = {};

          _.each(projectJSON.nodes, function(e,i,l) {
            objId = e.id || e._id;
            delete e._id;
            delete e.id;
            idsMap[objId] = e['@id'] = Utils.getUUID4();
          });
          _.each(projectJSON.edges, function(e,i,l) {
            delete e._id;
            delete e.id;
            e.to = idsMap[e.to];
            e.from = idsMap[e.from];
          });
          _.each(projectJSON.views, function(e,i,l) {
            objId = e.id || e._id;
            delete e._id;
            delete e.id;
          });
          projectJSON.users = [];

          var projectJSONStr = JSON.stringify(projectJSON, null, 2);
          var blob = new Blob([projectJSONStr], {type: "application/json;charset=utf-8"});
          filesaver(blob,fileNameToSaveAs);

        },
        foldBins: function() {
            var foldBinsButton = this.$.find(".Rk-Fold-Bins"),
            bins = this.renkan.$.find(".Rk-Bins");
            var _this = this;
            if (bins.offset().left < 0) {
                bins.animate({left: 0},250);
                this.$.animate({left: 300},250,function() {
                    var w = _this.$.width();
                    paper.view.viewSize = new paper.Size([w, _this.canvas_$.height()]);
                });
                foldBinsButton.html("&laquo;");
            } else {
                bins.animate({left: -300},250);
                this.$.animate({left: 0},250,function() {
                    var w = _this.$.width();
                    paper.view.viewSize = new paper.Size([w, _this.canvas_$.height()]);
                });
                foldBinsButton.html("&raquo;");
            }
        },
        save: function() { },
        open: function() { }
    });

    /* Scene End */

    return Scene;

});
