/**
 * Copyright 2013 IBM Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/
 

RED.view = function() {
    var space_width = 5000,
        space_height = 5000,
        lineCurveScale = 0.75,
        scaleFactor = 1,
        node_width = 100,
        node_height = 30;

    var activeWorkspace = 0;
    
    var selected_link = null,
        mousedown_link = null,
        mousedown_node = null,
        mousedown_port_type = null,
        mousedown_port_index = 0,
        mouseup_node = null,
        mouse_offset = [0,0],
        mouse_position = null,
        mouse_mode = 0,
        moving_set = [],
        dirty = false,
        lasso = null,
        active_group = null;
        pressTimer = null;

    var clipboard = "";

    var outer = d3.select("#chart")
        .append("svg:svg")
        .attr("width", space_width)
        .attr("height", space_height)
        .attr("pointer-events", "all")
        .style("cursor","crosshair");

    var vis = outer
        .append('svg:g')
        .on("dblclick.zoom", null)
        .append('svg:g')
        .on("mousemove", canvasMouseMove)
        .on("mousedown", canvasMouseDown)
        .on("mouseup", canvasMouseUp)
        .on("touchstart",canvasMouseDown)
        .on("touchend",canvasMouseUp)
        .on("touchmove",canvasMouseMove);

    var outer_background = vis.append('svg:rect')
        .attr('width', space_width)
        .attr('height', space_height)
        .attr('fill','#fff');

    var drag_line = vis.append("svg:path").attr("class", "drag_line");

    var workspace_tabs = RED.tabs.create({
        id: "workspace-tabs",
        onchange: function(id) {
            console.log(id);
            RED.view.setWorkspace(id.split("-")[1]);
        },
        ondblclick: function(id) {
            console.log("DC:",id);
        },
        onadd: function(tab) {
            var menuli = $("<li/>");
            var menuA = $("<a/>",{tabindex:"-1",href:"#"+tab.id}).appendTo(menuli);
            menuA.html(tab.label);
            menuA.on("click",function() {
                workspace_tabs.activateTab(tab.id);
            });
            
            $('#workspace-menu-list').append(menuli);
        }
    });
    workspace_tabs.addTab({id:"tab-1",label:"Workspace 1"});
    workspace_tabs.addTab({id:"tab-2",label:"Workspace 2"});
    workspace_tabs.addTab({id:"tab-3",label:"Workspace 3"});
    workspace_tabs.addTab({id:"tab-4",label:"Workspace 4"});
    
    $('#btn-workspace-add').on("click",function() {
        var id = Math.floor(Math.random()*2000);
        workspace_tabs.addTab({id:"tab-"+id,label:"Workspace "+id});
        workspace_tabs.activateTab("tab-"+id);
    });
    
    
    //d3.select(window).on("keydown", keydown);

    function canvasMouseDown() {
        // if (d3.event.shiftKey) {
        // var point = d3.mouse(this),
        // node = {x: point[0], y: point[1], w:node_width, h:node_height, type:Math.floor(Math.random()*3)},
        // n = nodes.push(node);
        // redraw();
        // } else
        //
        if (typeof d3.touches(this)[0] == "object") {
            pressTimer = setTimeout(function() { RED.history.pop(); }, 1500);
        }
        if (!mousedown_node && !mousedown_link) {
            selected_link = null;
            updateSelection();
            //vis.call(d3.behavior.zoom().on("zoom"), rescale);
        }
        if (mouse_mode == 0) {
            if (lasso) {
                lasso.remove();
                lasso = null;
            }
            var point = d3.touches(this)[0]||d3.mouse(this);
            if (d3.touches(this).length === 0) {
            lasso = vis.append('rect')
                .attr("ox",point[0])
                .attr("oy",point[1])
                .attr("rx",2)
                .attr("ry",2)
                .attr("x",point[0])
                .attr("y",point[1])
                .attr("width",0)
                .attr("height",0)
                .attr("class","lasso");
            d3.event.preventDefault();
			}
        }
    }

    function canvasMouseMove() {
        clearTimeout(pressTimer);
        mouse_position = d3.touches(this)[0]||d3.mouse(this);

        // TODO: auto scroll the container
        //var point = d3.mouse(this);
        //if (point[0]-container.scrollLeft < 30 && container.scrollLeft > 0) { container.scrollLeft -= 15; }
        //console.log(d3.mouse(this),container.offsetWidth,container.offsetHeight,container.scrollLeft,container.scrollTop);

        if (lasso) {
            var ox = parseInt(lasso.attr("ox"));
            var oy = parseInt(lasso.attr("oy"));
            var x = parseInt(lasso.attr("x"));
            var y = parseInt(lasso.attr("y"));
            if (mouse_position[0] < ox) {
                x = mouse_position[0];
                w = ox-x;
            } else {
                w = mouse_position[0]-x;
            }
            if (mouse_position[1] < oy) {
                y = mouse_position[1];
                h = oy-y;
            } else {
                h = mouse_position[1]-y;
            }
            lasso
                .attr("x",x)
                .attr("y",y)
                .attr("width",w)
                .attr("height",h)
            ;
            return;
        }

        if (mouse_mode != RED.state.IMPORT_DRAGGING && !mousedown_node && selected_link == null) return;

        if (mouse_mode == RED.state.JOINING) {
            // update drag line
            drag_line.attr("class", "drag_line");
            var mousePos = mouse_position;
            var numOutputs = (mousedown_port_type == 0)?(mousedown_node.outputs || 1):1;
            var sourcePort = mousedown_port_index;
            var y = -((numOutputs-1)/2)*13 +13*sourcePort;

            var sc = (mousedown_port_type == 0)?1:-1;

            var dy = mousePos[1]-(mousedown_node.y+y);
            var dx = mousePos[0]-(mousedown_node.x+sc*mousedown_node.w/2);
            var delta = Math.sqrt(dy*dy+dx*dx);
            var scale = lineCurveScale;
            var scaleY = 0;
            
            if (delta < node_width) {
                scale = 0.75-0.75*((node_width-delta)/node_width);
            }
            if (dx*sc < 0) {
                scale += 2*(Math.min(5*node_width,Math.abs(dx))/(5*node_width));
                if (Math.abs(dy) < 3*node_height) {
                    scaleY = ((dy>0)?0.5:-0.5)*(((3*node_height)-Math.abs(dy))/(3*node_height))*(Math.min(node_width,Math.abs(dx))/(node_width)) ;
                }
            }
            
            drag_line.attr("d",
                "M "+(mousedown_node.x+sc*mousedown_node.w/2)+" "+(mousedown_node.y+y)+
                " C "+(mousedown_node.x+sc*(mousedown_node.w/2+node_width*scale))+" "+(mousedown_node.y+y+scaleY*node_height)+" "+
                (mousePos[0]-sc*(scale)*node_width)+" "+(mousePos[1]-scaleY*node_height)+" "+
                mousePos[0]+" "+mousePos[1]
                );

        } else if (mouse_mode == RED.state.MOVING) {
            var m = mouse_position;
            var d = (mouse_offset[0]-m[0])*(mouse_offset[0]-m[0]) + (mouse_offset[1]-m[1])*(mouse_offset[1]-m[1]);
            if (d > 2) {
                mouse_mode = RED.state.MOVING_ACTIVE;
                clearTimeout(pressTimer);
            }
        } else if (mouse_mode == RED.state.MOVING_ACTIVE || mouse_mode == RED.state.IMPORT_DRAGGING) {
            var mousePos = mouse_position;
            if (d3.event.shiftKey && moving_set.length > 1) {
                mousePos[0] = 20*Math.floor(mousePos[0]/20);
                mousePos[1] = 20*Math.floor(mousePos[1]/20);
            }
            for (var n in moving_set) {
                var node = moving_set[n];
                node.n.x = mousePos[0]+node.dx;
                node.n.y = mousePos[1]+node.dy;
                if (d3.event.shiftKey && moving_set.length == 1) {
                    node.n.x = 20*Math.floor(node.n.x/20);
                    node.n.y = 20*Math.floor(node.n.y/20);
                }
                node.n.dirty = true;
            }
        }
        redraw();
    }

    function canvasMouseUp() {
        clearTimeout(pressTimer);
        if (mousedown_node && mouse_mode == RED.state.JOINING) {
            drag_line.attr("class", "drag_line_hidden");
        }
        if (lasso) {
            var x = parseInt(lasso.attr("x"));
            var y = parseInt(lasso.attr("y"));
            var x2 = x+parseInt(lasso.attr("width"));
            var y2 = y+parseInt(lasso.attr("height"));
            if (!d3.event.ctrlKey) {
                clearSelection();
            }
            RED.nodes.eachNode(function(n) {
                if (n.z == activeWorkspace && !n.selected) {
                    n.selected = (n.x > x && n.x < x2 && n.y > y && n.y < y2);
                    if (n.selected) {
                        n.dirty = true;
                        moving_set.push({n:n});
                    }
                }
            });
            updateSelection();
            lasso.remove();
            lasso = null;
        }
        if (mouse_mode == RED.state.MOVING_ACTIVE) {
            if (moving_set.length > 0) {
                var ns = [];
                for (var i in moving_set) {
                    ns.push({n:moving_set[i].n,ox:moving_set[i].ox,oy:moving_set[i].oy});
                }
                RED.history.push({t:'move',nodes:ns,dirty:dirty});
            }
        }
        if (mouse_mode == RED.state.IMPORT_DRAGGING) {
            RED.keyboard.remove(/* ESCAPE */ 27);
            var mousePos = d3.touches(this)[0]||d3.mouse(this);
            if (d3.event.shiftKey && moving_set.length > 1) {
                mousePos[0] = 20*Math.floor(mousePos[0]/20);
                mousePos[1] = 20*Math.floor(mousePos[1]/20);
            }
            for (var n in moving_set) {
                var node = moving_set[n];
                node.n.x = mousePos[0]+node.dx;
                node.n.y = mousePos[1]+node.dy;
                if (d3.event.shiftKey && moving_set.length == 1) {
                    node.n.x = 20*Math.floor(node.n.x/20);
                    node.n.y = 20*Math.floor(node.n.y/20);
                }
                node.n.dirty = true;
            }
        }
        redraw();
        // clear mouse event vars
        resetMouseVars();
    }

    $('#btn-zoom-out').click(function() {zoomOut();});
    $('#btn-zoom-zero').click(function() {zoomZero();});
    $('#btn-zoom-in').click(function() {zoomIn();});
    $("#chart").on('DOMMouseScroll mousewheel', function (evt) {
            if ( evt.altKey ) {
                evt.preventDefault();
                evt.stopPropagation();
                var move = evt.originalEvent.detail || evt.originalEvent.wheelDelta;
                if (move <= 0) { zoomIn(); }
                else { zoomOut(); }
            }
    });
    $("#chart").droppable({
            accept:".palette_node",
            drop: function( event, ui ) {
                d3.event = event;
                var selected_tool = ui.draggable[0].type;
                var mousePos = d3.touches(this)[0]||d3.mouse(this);
                mousePos[1] += this.scrollTop;
                mousePos[0] += this.scrollLeft;
                mousePos[1] /= scaleFactor;
                mousePos[0] /= scaleFactor;

                var nn = { id:(1+Math.random()*4294967295).toString(16),x: mousePos[0],y:mousePos[1],w:node_width,z:activeWorkspace};

                nn.type = selected_tool;
                nn._def = RED.nodes.getType(nn.type);
                nn.outputs = nn._def.outputs;

                nn.h = Math.max(node_height,(nn.outputs||0) * 15);

                for (var d in nn._def.defaults) {
                    nn[d] = nn._def.defaults[d].value;
                }
                RED.history.push({t:'add',nodes:[nn.id],dirty:dirty});
                RED.nodes.add(nn);
                RED.editor.validateNode(nn);
                setDirty(true);
                redraw();

                if (nn._def.autoedit) {
                    RED.editor.edit(nn);
                }
            }
    });

    function zoomIn() {
        if (scaleFactor < 2) {
            scaleFactor += 0.1;
            redraw();
        }
    }
    function zoomOut() {
        if (scaleFactor > 0.3) {
            scaleFactor -= 0.1;
            redraw();
        }
    }
    function zoomZero() {
        scaleFactor = 1;
        redraw();
    }

    function selectAll() {
        RED.nodes.eachNode(function(n) {
            if (n.z == activeWorkspace) {
                if (!n.selected) {
                    n.selected = true;
                    n.dirty = true;
                    moving_set.push({n:n});
                }
            }
        });
        selected_link = null;
        updateSelection();
        redraw();
    }

    function clearSelection() {
        for (var i in moving_set) {
            var n = moving_set[i];
            n.n.dirty = true;
            n.n.selected = false;
        }
        moving_set = [];
        selected_link = null;
    }

    function updateSelection() {
        if (moving_set.length == 0) {
            $("#li-menu-export").addClass("disabled");
            $("#li-menu-export-clipboard").addClass("disabled");
            $("#li-menu-export-library").addClass("disabled");
        } else {
            $("#li-menu-export").removeClass("disabled");
            $("#li-menu-export-clipboard").removeClass("disabled");
            $("#li-menu-export-library").removeClass("disabled");
        }
        if (moving_set.length == 0 && selected_link == null) {
            RED.keyboard.remove(/* backspace */ 8);
            RED.keyboard.remove(/* delete */ 46);
            RED.keyboard.remove(/* c */ 67);
        } else {
            RED.keyboard.add(/* backspace */ 8,function(){deleteSelection();d3.event.preventDefault();});
            RED.keyboard.add(/* delete */ 46,function(){deleteSelection();d3.event.preventDefault();});
            RED.keyboard.add(/* c */ 67,{ctrl:true},function(){copySelection();d3.event.preventDefault();});
        }

        if (moving_set.length == 1) {
            buildInfo(moving_set[0].n);
        } else {
            $("#tab-info").html("");
        }
    }

    function deleteSelection() {
        var removedNodes = [];
        var removedLinks = [];
        var startDirty = dirty;
        if (moving_set.length > 0) {
            for (var i in moving_set) {
                var node = moving_set[i].n;
                node.selected = false;
                if (node.x < 0) {node.x = 25};
                var rmlinks = RED.nodes.remove(node.id);
                removedNodes.push(node);
                removedLinks = removedLinks.concat(rmlinks);
            }
            moving_set = [];
            setDirty(true);
        }
        if (selected_link) {
            RED.nodes.removeLink(selected_link);
            removedLinks.push(selected_link);
            setDirty(true);
        }
        RED.history.push({t:'delete',nodes:removedNodes,links:removedLinks,dirty:startDirty});

        selected_link = null;
        updateSelection();
        redraw();
    }

    function copySelection() {
        if (moving_set.length > 0) {
            var nns = [];
            for (var n in moving_set) {
                var node = moving_set[n].n;
                nns.push(RED.nodes.convertNode(node));
            }
            clipboard = JSON.stringify(nns);
            RED.notify(moving_set.length+" node"+(moving_set.length>1?"s":"")+" copied");
        }
    }

    function buildInfo(node) {
        var table = '<table class="node-info"><tbody>';

        table += "<tr><td>Type</td><td>&nbsp;"+node.type+"</td></tr>";
        table += "<tr><td>ID</td><td>&nbsp;"+node.id+"</td></tr>";
        table += '<tr class="blank"><td colspan="2">&nbsp;Properties</td></tr>';
        for (var n in node._def.defaults) {
            if ((n != "func")&&(n != "template")) {
                var safe = (node[n]||"").toString().replace(/&/g,"&amp;").replace(/</g,"&lt;").replace(/>/g,"&gt;");
                table += "<tr><td>&nbsp;"+n+"</td><td>"+safe+"</td></tr>";
            }
            if ((n == "func")||(n == "template")) {
                table += "<tr><td>&nbsp;"+n+"</td><td>(...)</td></tr>";
            }
        }
        table += "</tbody></table><br/>";
        table  += '<div class="node-help">'+($("script[data-help-name|='"+node.type+"']").html()||"")+"</div>";
        $("#tab-info").html(table);
    }

    function calculateTextWidth(str) {
        var sp = document.createElement("span");
        sp.className = "node_label";
        sp.style.position = "absolute";
        sp.style.top = "-1000px";
        sp.innerHTML = (str||"").replace(/&/g,"&amp;").replace(/</g,"&lt;").replace(/>/g,"&gt;");
        document.body.appendChild(sp);
        var w = sp.offsetWidth;
        document.body.removeChild(sp);
        return 35+w;
    }

    function resetMouseVars() {
        mousedown_node = null;
        mouseup_node = null;
        mousedown_link = null;
        mouse_mode = 0;
        mousedown_port_type = 0;
    }

    function portMouseDown(d,portType,portIndex) {
        // disable zoom
        vis.call(d3.behavior.zoom().on("zoom"), null);
        mousedown_node = d;
        selected_link = null;
        mouse_mode = RED.state.JOINING;
        mousedown_port_type = portType;
        mousedown_port_index = portIndex || 0;
        document.body.style.cursor = "crosshair";
    };

    function portMouseUp(d,portType,portIndex) {
        document.body.style.cursor = "";
        if (mouse_mode == RED.state.JOINING && mousedown_node) {
            mouseup_node = d;
            if (portType == mousedown_port_type || mouseup_node === mousedown_node) {
                drag_line.attr("class", "drag_line_hidden");
                resetMouseVars(); return;
            }
            var src,dst,src_port;
            if (mousedown_port_type == 0) {
                src = mousedown_node;
                src_port = mousedown_port_index;
                dst = mouseup_node;
            } else if (mousedown_port_type == 1) {
                src = mouseup_node;
                dst = mousedown_node;
                src_port = portIndex;
            }

            var existingLink = false;
            RED.nodes.eachLink(function(d) {
                    existingLink = existingLink || (d.source === src && d.target === dst && d.sourcePort == src_port);
            });
            if (!existingLink) {
                var link = {source: src, sourcePort:src_port, target: dst};
                RED.nodes.addLink(link);
                RED.history.push({t:'add',links:[link],dirty:dirty});
                setDirty(true);
            }
            selected_link = null;
            redraw();
        }
    }

    function nodeMouseUp(d) {
        portMouseUp(d, d._def.inputs > 0 ? 1 : 0, 0);
    }

    function nodeMouseDown(d) {
        if (typeof d3.touches(this)[0] == "object") {
            pressTimer = setTimeout(function() { RED.editor.edit(d); }, 1500);
        }
        if (mouse_mode == RED.state.IMPORT_DRAGGING) {
            RED.keyboard.remove(/* ESCAPE */ 27);
            updateSelection();
            setDirty(true);
            redraw();
            resetMouseVars();
            d3.event.stopPropagation();
            return;
        }
        mousedown_node = d;
        if (d.selected && d3.event.ctrlKey) {
            d.selected = false;
            for (var i=0;i<moving_set.length;i+=1) {
                if (moving_set[i].n === d) {
                    moving_set.splice(i,1);
                    break;
                }
            }
        } else {
            if (d3.event.shiftKey) {
                clearSelection();
                var cnodes = RED.nodes.getAllFlowNodes(mousedown_node);
                for (var i in cnodes) {
                    cnodes[i].selected = true;
                    cnodes[i].dirty = true;
                    moving_set.push({n:cnodes[i]});
                }
            } else if (!d.selected) {
                if (!d3.event.ctrlKey) {
                    clearSelection();
                }
                mousedown_node.selected = true;
                moving_set.push({n:mousedown_node});
            }
            selected_link = null;
            if (d3.event.button != 2) {
                mouse_mode = RED.state.MOVING;
                var mouse = d3.touches(this)[0]||d3.mouse(this);
                mouse[0] += d.x-d.w/2;
                mouse[1] += d.y-d.h/2;
                for (var i in moving_set) {
                    moving_set[i].ox = moving_set[i].n.x;
                    moving_set[i].oy = moving_set[i].n.y;
                    moving_set[i].dx = moving_set[i].n.x-mouse[0];
                    moving_set[i].dy = moving_set[i].n.y-mouse[1];
                }
                mouse_offset = d3.mouse(document.body);
                if (isNaN(mouse_offset[0])) {
                    mouse_offset = d3.touches(document.body)[0];
                }
            }
        }
        d.dirty = true;
        updateSelection();
        redraw();
        d3.event.stopPropagation();
    }

    function redraw() {
        vis.attr("transform","scale("+scaleFactor+")");
        outer.attr("width", space_width*scaleFactor).attr("height", space_height*scaleFactor);
        outer_background.attr('fill', function() {
                return active_group == null?'#fff':'#eee';
        });

        if (mouse_mode != RED.state.JOINING) {
            // Don't bother redrawing nodes if we're drawing links

            var node = vis.selectAll(".nodegroup").data(RED.nodes.nodes.filter(function(d) { return d.z == activeWorkspace }),function(d){return d.id});
            node.exit().remove();

            var nodeEnter = node.enter().insert("svg:g").attr("class", "node nodegroup");
            nodeEnter.each(function(d,i) {
                    var node = d3.select(this);

                    var l = d._def.label;
                    l = (typeof l === "function" ? l.call(d) : l)||"";
                    d.w = Math.max(node_width,calculateTextWidth(l)+(d._def.inputs>0?7:0) );
                    d.h = Math.max(node_height,(d.outputs||0) * 15);

                    if (d._def.badge) {
                        var badge = node.append("svg:g").attr("class","node_badge_group");
                        var badgeRect = badge.append("rect").attr("class","node_badge").attr("rx",5).attr("ry",5).attr("width",40).attr("height",15);
                        badge.append("svg:text").attr("class","node_badge_label").attr("x",35).attr("y",11).attr('text-anchor','end').text(d._def.badge());
                        if (d._def.onbadgeclick) {
                            badgeRect.attr("cursor","pointer")
                                .on("click",function(d) { d._def.onbadgeclick.call(d);d3.event.preventDefault();});
                        }
                    }

                    if (d._def.button) {
                        node.append('rect')
                            .attr("class",function(d) { return (d._def.align == "right") ? "node_right_button_group" : "node_left_button_group"; })
                            .attr("x",function(d) { return (d._def.align == "right") ? 94 : -25; })
                            .attr("y",2)
                            .attr("rx",8)
                            .attr("ry",8)
                            .attr("width",32)
                            .attr("height",node_height-4)
                            .attr("fill","#eee");//function(d) { return d._def.color;})
                        node.append('rect')
                            .attr("class",function(d) { return (d._def.align == "right") ? "node_right_button" : "node_left_button"; })
                            .attr("x",function(d) { return (d._def.align == "right") ? 104 : -20; })
                            .attr("y",6)
                            .attr("rx",5)
                            .attr("ry",5)
                            .attr("width",16)
                            .attr("height",node_height-12)
                            .attr("fill",function(d) { return d._def.color;})
                            .attr("cursor","pointer")
                            .on("mousedown",function(d) {if (!lasso) { d3.select(this).attr("fill-opacity",0.2);d3.event.preventDefault(); d3.event.stopPropagation();}})
                            .on("mouseup",function(d) {if (!lasso) { d3.select(this).attr("fill-opacity",0.4);d3.event.preventDefault();d3.event.stopPropagation();}})
                            .on("mouseover",function(d) {if (!lasso) { d3.select(this).attr("fill-opacity",0.4);}})
                            .on("mouseout",function(d) {if (!lasso) { d3.select(this).attr("fill-opacity",1);}})
                            .on("click",function(d) { d._def.button.onclick.call(d); d3.event.preventDefault(); })
                            .on("touchstart",function(d) { d._def.button.onclick.call(d); d3.event.preventDefault(); })
                    }

                    var mainRect = node.append("rect")
                        .attr("class", "node")
                        .attr("rx", 6)
                        .attr("ry", 6)
                        .attr("fill",function(d) { return d._def.color;})
                        .on("mousedown",nodeMouseDown)
                        .on("touchstart",nodeMouseDown)
                        .on("dblclick",function(d) {RED.editor.edit(d);})
                        .on("mouseover",function(d) {
                                if (mouse_mode == 0) {
                                    var node = d3.select(this);
                                    node.classed("node_hovered",true);
                                }
                        })
                        .on("mouseout",function(d) {
                                var node = d3.select(this);
                                node.classed("node_hovered",false);
                        });

                   //node.append("rect").attr("class", "node-gradient-top").attr("rx", 6).attr("ry", 6).attr("height",30).attr("stroke","none").attr("fill","url(#gradient-top)").style("pointer-events","none");
                   //node.append("rect").attr("class", "node-gradient-bottom").attr("rx", 6).attr("ry", 6).attr("height",30).attr("stroke","none").attr("fill","url(#gradient-bottom)").style("pointer-events","none");

                    mainRect.on("mouseup",nodeMouseUp);
                    mainRect.on("touchend",function(){ clearTimeout(pressTimer); nodeMouseUp; });
                    //mainRect.on("touchend",nodeMouseUp);

                    if (d._def.icon) {
                        var icon = node.append("image")
                            .attr("xlink:href","icons/"+d._def.icon)
                            .attr("class","node_icon")
                            .attr("x",0).attr("y",function(d){return (d.h-Math.min(50,d.h))/2;})
                            .attr("width","15")
                            .attr("height", function(d){return Math.min(50,d.h);});
                            
                        if (d._def.align) {
                            icon.attr('class','node_icon node_icon_'+d._def.align);
                        }
                        if (d._def.inputs > 0) {
                            icon.attr("x",8);
                        }
                        icon.style("pointer-events","none");
                    }
                    var text = node.append('svg:text').attr('class','node_label').attr('x', 23).attr('dy', '.35em').attr('text-anchor','start');
                    if (d._def.align) {
                        text.attr('class','node_label node_label_'+d._def.align);
                        text.attr('text-anchor','end');
                    }

                    if (d._def.inputs > 0) {
                        text.attr("x",30);
                        node.append("rect").attr("class","port port_input").attr("rx",3).attr("ry",3).attr("x",-5).attr("width",10).attr("height",10)
                            .on("mousedown",function(d){portMouseDown(d,1,0);})
                            .on("touchstart",function(d){portMouseDown(d,1,0);})
                            .on("mouseup",function(d){portMouseUp(d,1,0);} )
                            .on("touchend",function(d){portMouseUp(d,1,0);} )
                            .on("mouseover",function(d) { var port = d3.select(this); port.classed("port_hovered",(mouse_mode!=RED.state.JOINING || mousedown_port_type != 1 ));})
                            .on("mouseout",function(d) { var port = d3.select(this); port.classed("port_hovered",false);})
                    }

                    //node.append("path").attr("class","node_error").attr("d","M 3,-3 l 10,0 l -5,-8 z");
                    node.append("image").attr("class","node_error hidden").attr("xlink:href","icons/node-error.png").attr("x",0).attr("y",-6).attr("width",10).attr("height",9);
            });

            node.each(function(d,i) {
                    if (d.dirty) {
                        if (d.x < -50) deleteSelection();  // Delete nodes if dragged back to palette
                        if (d.resize) {
                            var l = d._def.label;
                            l = (typeof l === "function" ? l.call(d) : l)||"";
                            d.w = Math.max(node_width,calculateTextWidth(l)+(d._def.inputs>0?7:0) );
                            d.h = Math.max(node_height,(d.outputs||0) * 15);
                        }
                        var thisNode = d3.select(this);
                        thisNode.attr("transform", function(d) { return "translate(" + (d.x-d.w/2) + "," + (d.y-d.h/2) + ")"; });
                        thisNode.selectAll(".node")
                            .attr("width",function(d){return d.w})
                            .attr("height",function(d){return d.h})
                            .classed("node_selected",function(d) { return d.selected; })
                            .classed("node_highlighted",function(d) { return d.highlighted; })
                        ;
                        //thisNode.selectAll(".node-gradient-top").attr("width",function(d){return d.w});
                        //thisNode.selectAll(".node-gradient-bottom").attr("width",function(d){return d.w}).attr("y",function(d){return d.h-30});

                        thisNode.selectAll(".node_label_right").attr('x', function(d){return d.w-23-(d.outputs>0?5:0);});
                        thisNode.selectAll(".node_icon_right").attr("x",function(d){return d.w-16-(d.outputs>0?5:0);});

                        var numOutputs = d.outputs;
                        var y = (d.h/2)-((numOutputs-1)/2)*13;
                        d.ports = d.ports || d3.range(numOutputs);
                        d._ports = thisNode.selectAll(".port_output").data(d.ports);
                        d._ports.enter().append("rect").attr("class","port port_output").attr("rx",3).attr("ry",3).attr("width",10).attr("height",10)
                            .on("mousedown",function(){var node = d; return function(d,i){portMouseDown(node,0,i);}}() )
                            .on("touchstart",function(){var node = d; return function(d,i){portMouseDown(node,0,i);}}() )
                            .on("mouseup",function(){var node = d; return function(d,i){portMouseUp(node,0,i);}}() )
                            .on("touchend",function(){var node = d; return function(d,i){portMouseUp(node,0,i);}}() )
                            .on("mouseover",function(d,i) { var port = d3.select(this); port.classed("port_hovered",(mouse_mode!=RED.state.JOINING || mousedown_port_type != 0 ));})
                            .on("mouseout",function(d,i) { var port = d3.select(this); port.classed("port_hovered",false);});
                        d._ports.exit().remove();
                        if (d._ports) {
                            var numOutputs = d.outputs || 1;
                            var y = (d.h/2)-((numOutputs-1)/2)*13;
                            var x = d.w - 5;
                            d._ports.each(function(d,i) {
                                    var port = d3.select(this);
                                    port.attr("y",(y+13*i)-5).attr("x",x);
                            });
                        }
                        thisNode.selectAll('text.node_label').text(function(d,i){
                                if (d._def.label) {
                                    if (typeof d._def.label == "function") {
                                        return d._def.label.call(d);
                                    } else {
                                        return d._def.label;
                                    }
                                }
                                return "";
                        })
                            .attr('y', function(d){return (d.h/2)-1;})
                            .attr('class',function(d){
                                return 'node_label'+
                                (d._def.align?' node_label_'+d._def.align:'')+
                                (d._def.label?' '+(typeof d._def.labelStyle == "function" ? d._def.labelStyle.call(d):d._def.labelStyle):'') ;
                        });
                        thisNode.selectAll(".node_tools").attr("x",function(d){return d.w-35;}).attr("y",function(d){return d.h-20;});
                        thisNode.selectAll(".node_error")
                            .attr("x",function(d){return d.w-5})
                            .classed("hidden",function(d) { return d.valid; });
                        thisNode.selectAll(".port_input").each(function(d,i) {
                                var port = d3.select(this);
                                port.attr("y",function(d){return (d.h/2)-5;})
                        });
                        thisNode.selectAll(".node_icon").attr("height",function(d){return Math.min(50,d.h);}).attr("y",function(d){return (d.h-Math.min(50,d.h))/2;});

                        thisNode.selectAll('.node_right_button_group').attr("transform",function(d){return "translate("+(d.w-100)+","+0+")";});
                        thisNode.selectAll('.node_right_button').attr("transform",function(d){return "translate("+(d.w-100)+","+0+")";}).attr("fill",function(d) {
                                 return typeof d._def.button.color  === "function" ? d._def.button.color.call(d):(d._def.button.color != null ? d._def.button.color : d._def.color)
                        });

                        thisNode.selectAll('.node_badge_group').attr("transform",function(d){return "translate("+(d.w-40)+","+(d.h+3)+")";});
                        thisNode.selectAll('text.node_badge_label').text(function(d,i) {
                            if (d._def.badge) {
                                if (typeof d._def.badge == "function") {
                                    return d._def.badge.call(d);
                                } else {
                                    return d._def.badge;
                                }
                            }
                            return "";
                        });

                        d.dirty = false;
                    }
            });
        }

        var link = vis.selectAll(".link").data(RED.nodes.links.filter(function(d) { return d.source.z == activeWorkspace && d.target.z == activeWorkspace }));

        link.enter().insert("svg:path",".node").attr("class","link")
           .on("mousedown",function(d) {
                mousedown_link = d;
                clearSelection();
                selected_link = mousedown_link;
                updateSelection();
                redraw();
                d3.event.stopPropagation();
            })
            .on("touchstart",function(d) {
                mousedown_link = d;
                clearSelection();
                selected_link = mousedown_link;
                updateSelection();
                redraw();
                d3.event.stopPropagation();
                pressTimer = setTimeout(function() { deleteSelection(); }, 1500);
            })
            .on("touchend",function() { clearTimeout(pressTimer); });

        link.exit().remove();

        link.attr("d",function(d){
                var numOutputs = d.source.outputs || 1;
                var sourcePort = d.sourcePort || 0;
                var y = -((numOutputs-1)/2)*13 +13*sourcePort;

                var dy = d.target.y-(d.source.y+y);
                var dx = (d.target.x-d.target.w/2)-(d.source.x+d.source.w/2);
                var delta = Math.sqrt(dy*dy+dx*dx);
                var scale = lineCurveScale;
                var scaleY = 0;
                if (delta < node_width) {
                    scale = 0.75-0.75*((node_width-delta)/node_width);
                }
                
                if (dx < 0) {
                    scale += 2*(Math.min(5*node_width,Math.abs(dx))/(5*node_width));
                    if (Math.abs(dy) < 3*node_height) {
                        scaleY = ((dy>0)?0.5:-0.5)*(((3*node_height)-Math.abs(dy))/(3*node_height))*(Math.min(node_width,Math.abs(dx))/(node_width)) ;
                    }
                }
                
                d.x1 = d.source.x+d.source.w/2;
                d.y1 = d.source.y+y;
                d.x2 = d.target.x-d.target.w/2;
                d.y2 = d.target.y;

                return "M "+(d.source.x+d.source.w/2)+" "+(d.source.y+y)+
                    " C "+(d.source.x+d.source.w/2+scale*node_width)+" "+(d.source.y+y+scaleY*node_height)+" "+
                    (d.target.x-d.target.w/2-scale*node_width)+" "+(d.target.y-scaleY*node_height)+" "+
                    (d.target.x-d.target.w/2)+" "+d.target.y;
        })

        link.classed("link_selected", function(d) { return d === selected_link || d.selected; });

        if (d3.event) {
            d3.event.preventDefault();
        }
    }

    RED.keyboard.add(/* z */ 90,{ctrl:true},function(){RED.history.pop();});
    RED.keyboard.add(/* a */ 65,{ctrl:true},function(){selectAll();d3.event.preventDefault();});
    RED.keyboard.add(/* = */ 187,{ctrl:true},function(){zoomIn();d3.event.preventDefault();});
    RED.keyboard.add(/* - */ 189,{ctrl:true},function(){zoomOut();d3.event.preventDefault();});
    RED.keyboard.add(/* 0 */ 48,{ctrl:true},function(){zoomZero();d3.event.preventDefault();});
    RED.keyboard.add(/* v */ 86,{ctrl:true},function(){importNodes(clipboard);d3.event.preventDefault();});
    RED.keyboard.add(/* e */ 69,{ctrl:true},function(){showExportNodesDialog();d3.event.preventDefault();});
    RED.keyboard.add(/* i */ 73,{ctrl:true},function(){showImportNodesDialog();d3.event.preventDefault();});

    // TODO: 'dirty' should be a property of RED.nodes - with an event callback for ui hooks
    function setDirty(d) {
        dirty = d;
        if (dirty) {
            $("#btn-deploy").removeClass("disabled").addClass("btn-danger");
        } else {
            $("#btn-deploy").addClass("disabled").removeClass("btn-danger");;
        }
    }

    /**
     * Imports a new collection of nodes from a JSON String.
     *  - all get new IDs assigned
     *  - all 'selected'
     *  - attached to mouse for placing - 'IMPORT_DRAGGING'
     */
    function importNodes(newNodesStr) {
        try {
            var result = RED.nodes.import(newNodesStr,true);
            if (result) {
                var new_nodes = result[0];
                var new_links = result[1];
                var new_ms = new_nodes.map(function(n) { n.z = activeWorkspace; return {n:n};});
                var new_node_ids = new_nodes.map(function(n){ return n.id; });

                // TODO: pick a more sensible root node
                var root_node = new_ms[0].n;
                var dx = root_node.x;
                var dy = root_node.y;
                
                if (mouse_position == null) {
                    mouse_position = [0,0];
                }
                
                for (var i in new_ms) {
                    new_ms[i].n.selected = true;
                    new_ms[i].n.x -= dx - mouse_position[0];
                    new_ms[i].n.y -= dy - mouse_position[1];
                    new_ms[i].dx = new_ms[i].n.x - mouse_position[0];
                    new_ms[i].dy = new_ms[i].n.y - mouse_position[1];
                }
                mouse_mode = RED.state.IMPORT_DRAGGING;

                RED.keyboard.add(/* ESCAPE */ 27,function(){
                        RED.keyboard.remove(/* ESCAPE */ 27);
                        clearSelection();
                        RED.history.pop();
                        mouse_mode = 0;
                });

                RED.history.push({t:'add',nodes:new_node_ids,links:new_links,dirty:RED.view.dirty()});

                clearSelection();
                moving_set = new_ms;

                redraw();
            }
        } catch(error) {
            console.log(error);
            RED.notify("<strong>Error</strong>: "+error,"error");
        }
    }

    $('#btn-import').click(function() {showImportNodesDialog();});
    $('#btn-export-clipboard').click(function() {showExportNodesDialog();});
    $('#btn-export-library').click(function() {showExportNodesLibraryDialog();});

    function showExportNodesDialog() {
        mouse_mode = RED.state.EXPORT;
        var nns = RED.nodes.createExportableNodeSet(moving_set);
        $("#dialog-form").html($("script[data-template-name='export-clipboard-dialog']").html());
        $("#node-input-export").val(JSON.stringify(nns));
        $("#node-input-export").focus(function() {
                var textarea = $(this);
                textarea.select();
                textarea.mouseup(function() {
                        textarea.unbind("mouseup");
                        return false;
                });
        });
        $( "#dialog" ).dialog("option","title","Export nodes to clipboard").dialog( "open" );
        $("#node-input-export").focus();
    }

    function showExportNodesLibraryDialog() {
        mouse_mode = RED.state.EXPORT;
        var nns = RED.nodes.createExportableNodeSet(moving_set);
        $("#dialog-form").html($("script[data-template-name='export-library-dialog']").html());
        $("#node-input-filename").attr('nodes',JSON.stringify(nns));
        $( "#dialog" ).dialog("option","title","Export nodes to library").dialog( "open" );
    }

    function showImportNodesDialog() {
        mouse_mode = RED.state.IMPORT;
        $("#dialog-form").html($("script[data-template-name='import-dialog']").html());
        $("#node-input-import").val("");
        $( "#dialog" ).dialog("option","title","Import nodes").dialog( "open" );
    }

    return {
        state:function(state) {
            if (state == null) {
                return mouse_mode
            } else {
                mouse_mode = state;
            }
        },
        setWorkspace: function(z) {
            activeWorkspace = z;
            clearSelection();
            RED.nodes.eachNode(function(n) {
                n.dirty = true;
            });
            redraw();
        },
        redraw:redraw,
        dirty: function(d) {
            if (d == null) {
                return dirty;
            } else {
                setDirty(d);
            }
        },
        importNodes: importNodes,
        resize: function() {
            workspace_tabs.resize();
        }
    };
}();