var labelType, useGradients, nativeTextSupport, animate;

(function() {
  var ua = navigator.userAgent,
      iStuff = ua.match(/iPhone/i) || ua.match(/iPad/i),
      typeOfCanvas = typeof HTMLCanvasElement,
      nativeCanvasSupport = (typeOfCanvas == 'object' || typeOfCanvas == 'function'),
      textSupport = nativeCanvasSupport 
        && (typeof document.createElement('canvas').getContext('2d').fillText == 'function');
  //I'm setting this based on the fact that ExCanvas provides text support for IE
  //and that as of today iPhone/iPad current text support is lame
  labelType = (!nativeCanvasSupport || (textSupport && !iStuff))? 'Native' : 'HTML';
  nativeTextSupport = labelType == 'Native';
  useGradients = nativeCanvasSupport;
  animate = !(iStuff || !nativeCanvasSupport);
})();

var Log = {
  elem: false,
  write: function(text){
    if (!this.elem) 
      this.elem = document.getElementById('log');
    this.elem.innerHTML = text;
    this.elem.style.left = (500 - this.elem.offsetWidth / 2) + 'px';
  }
};


function init(){
    //init data
    //If a node in this JSON structure
    //has the "$type" or "$dim" parameters
    //defined it will override the "type" and
    //"dim" parameters globally defined in the
    //RGraph constructor.
    var json = [{
        "id": "node0",
        "name": "node0 name",
        "data": {
            "$dim": 16.759175934208628,
            "some other key": "some other value"
        },
        "adjacencies": [{
            "nodeTo": "node1",
            "data": {
                "weight": 3
            }
        }, {
            "nodeTo": "node2",
            "data": {
                "weight": 3
            }
        }, {
            "nodeTo": "node3",
            "data": {
                "weight": 3
            }
        }, {
            "nodeTo": "node4",
            "data": {
                "$type":"arrow",
                "$color":"#dd99dd",
                "$dim":25,
                "weight": 1
            }
        }, {
            "nodeTo": "node5",
            "data": {
                "weight": 1
            }
        }]
    }, {
        "id": "node1",
        "name": "node1 name",
        "data": {
            "$dim": 13.077119090372014,
            "$type": "square",
            "some other key": "some other value"
        },
        "adjacencies": [{
            "nodeTo": "node0",
            "data": {
                "weight": 3
            }
        }, {
            "nodeTo": "node2",
            "data": {
                "weight": 1
            }
        }, {
            "nodeTo": "node3",
            "data": {
                "weight": 3
            }
        }, {
            "nodeTo": "node4",
            "data": {
                "weight": 1
            }
        }, {
            "nodeTo": "node5",
            "data": {
                "weight": 1
            }
        }]
    }, {
        "id": "node2",
        "name": "node2 name",
        "data": {
            "$dim": 24.937383149648717,
            "$type": "triangle",
            "some other key": "some other value"
        },
        "adjacencies": [{
            "nodeTo": "node0",
            "data": {
                "weight": 3
            }
        }, {
            "nodeTo": "node1",
            "data": {
                "weight": 1
            }
        }, {
            "nodeTo": "node3",
            "data": {
                "weight": 3
            }
        }, {
            "nodeTo": "node4",
            "data": {
                "weight": 3
            }
        }, {
            "nodeTo": "node5",
            "data": {
                "weight": 1
            }
        }]
    }, {
        "id": "node3",
        "name": "node3 name",
        "data": {
            "$dim": 10.53272740718869,
            "some other key": "some other value"
        },
        "adjacencies": [{
            "nodeTo": "node0",
            "data": {
                "weight": 3
            }
        }, {
            "nodeTo": "node1",
            "data": {
                "weight": 3
            }
        }, {
            "nodeTo": "node2",
            "data": {
                "weight": 3
            }
        }, {
            "nodeTo": "node4",
            "data": {
                "$type":"arrow",
                "$direction": ["node4", "node3"],
                "$dim":25,
                "$color":"#dd99dd",
                "weight": 1
            }
        }, {
            "nodeTo": "node5",
            "data": {
                "weight": 3
            }
        }]
    }, {
        "id": "node4",
        "name": "node4 name",
        "data": {
            "$dim": 5.3754347037767345,
            "$type":"triangle",
            "some other key": "some other value"
        },
        "adjacencies": [{
            "nodeTo": "node0",
            "data": {
                "weight": 1
            }
        }, {
            "nodeTo": "node1",
            "data": {
                "weight": 1
            }
        }, {
            "nodeTo": "node2",
            "data": {
                "weight": 3
            }
        }, {
            "nodeTo": "node3",
            "data": {
                "weight": 1
            }
        }, {
            "nodeTo": "node5",
            "data": {
                "weight": 3
            }
        }]
    }, {
        "id": "node5",
        "name": "node5 name",
        "data": {
            "$dim": 32.26403873194912,
            "$type": "star",
            "some other key": "some other value"
        },
        "adjacencies": [{
            "nodeTo": "node0",
            "data": {
                "weight": 1
            }
        }, {
            "nodeTo": "node1",
            "data": {
                "weight": 1
            }
        }, {
            "nodeTo": "node2",
            "data": {
                "weight": 1
            }
        }, {
            "nodeTo": "node3",
            "data": {
                "weight": 3
            }
        }, {
            "nodeTo": "node4",
            "data": {
                "weight": 3
            }
        }]
    }];
    //end
    //init RGraph
    var rgraph = new $jit.RGraph({
      'injectInto': 'infovis',
      //Optional: Add a background canvas
      //that draws some concentric circles.
      'background': {
        'CanvasStyles': {
          'strokeStyle': '#555',
          'shadowBlur': 50,
          'shadowColor': '#ccc'
        }
      },
        //Nodes and Edges parameters
        //can be overridden if defined in 
        //the JSON input data.
        //This way we can define different node
        //types individually.
        Node: {
            'overridable': true,
             'color': '#cc0000'
        },
        Edge: {
            'overridable': true,
            'color': '#cccc00'
        },
        //Set polar interpolation.
        //Default's linear.
        interpolation: 'polar',
        //Change the transition effect from linear
        //to elastic.
        transition: $jit.Trans.Elastic.easeOut,
        //Change other animation parameters.
        duration:3500,
        fps: 30,
        //Change father-child distance.
        levelDistance: 200,
        //This method is called right before plotting
        //an edge. This method is useful to change edge styles
        //individually.
        onBeforePlotLine: function(adj){
            //Add some random lineWidth to each edge.
            if (!adj.data.$lineWidth) 
                adj.data.$lineWidth = Math.random() * 5 + 1;
        },
        
        onBeforeCompute: function(node){
            Log.write("centering " + node.name + "...");
            
            //Make right column relations list.
            var html = "<h4>" + node.name + "</h4><b>Connections:</b>";
            html += "<ul>";
            node.eachAdjacency(function(adj){
                var child = adj.nodeTo;
                html += "<li>" + child.name + "</li>";
            });
            html += "</ul>";
            $jit.id('inner-details').innerHTML = html;
        },
        //Add node click handler and some styles.
        //This method is called only once for each node/label crated.
        onCreateLabel: function(domElement, node){
            domElement.innerHTML = node.name;
            domElement.onclick = function () {
                rgraph.onClick(node.id, { hideLabels: false });
            };
            var style = domElement.style;
            style.cursor = 'pointer';
            style.fontSize = "0.8em";
            style.color = "#fff";
        },
        //This method is called when rendering/moving a label.
        //This is method is useful to make some last minute changes
        //to node labels like adding some position offset.
        onPlaceLabel: function(domElement, node){
            var style = domElement.style;
            var left = parseInt(style.left);
            var w = domElement.offsetWidth;
            style.left = (left - w / 2) + 'px';
        },
        
        onAfterCompute: function(){
            Log.write("done");
        }
        
    });
    //load graph.
    rgraph.loadJSON(json, 1);
    
    //compute positions and plot
    rgraph.refresh();
    //end
    rgraph.controller.onBeforeCompute(rgraph.graph.getNode(rgraph.root));
    rgraph.controller.onAfterCompute();
    
}