var labelType, useGradients, nativeTextSupport, animate, json, Mconsole, gType;

(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 imgArray = new Object();

imgArray['Group'] = new Image(); imgArray['Group'].src = '/assets/group.png';
imgArray['Person'] = new Image(); imgArray['Person'].src = '/assets/person.png';
imgArray['Bizarre'] = new Image(); imgArray['Bizarre'].src = '/assets/bizarre.png';
imgArray['Catalyst'] = new Image(); imgArray['Catalyst'].src = '/assets/catalyst.png';
imgArray['Closed'] = new Image(); imgArray['Closed'].src = '/assets/closed.png';
imgArray['Experience'] = new Image(); imgArray['Experience'].src = '/assets/experience.png';
imgArray['Future Dev'] = new Image(); imgArray['Future Dev'].src = '/assets/futuredev.png';
imgArray['Idea'] = new Image(); imgArray['Idea'].src = '/assets/idea.png';
imgArray['Implication'] = new Image(); imgArray['Implication'].src = '/assets/implication.png';
imgArray['Insight'] = new Image(); imgArray['Insight'].src = '/assets/insight.png';
imgArray['Intention'] = new Image(); imgArray['Intention'].src = '/assets/intention.png';
imgArray['Knowledge'] = new Image(); imgArray['Knowledge'].src = '/assets/knowledge.png';
imgArray['Location'] = new Image(); imgArray['Location'].src = '/assets/location.png';
imgArray['Open Issue'] = new Image(); imgArray['Open Issue'].src = '/assets/openissue.png';
imgArray['Opinion'] = new Image(); imgArray['Opinion'].src = '/assets/opinion.png';
imgArray['Opportunity'] = new Image(); imgArray['Opportunity'].src = '/assets/opportunity.png';
imgArray['Platform'] = new Image(); imgArray['Platform'].src = '/assets/platform.png';
imgArray['Problem'] = new Image(); imgArray['Problem'].src = '/assets/problem.png';
imgArray['Question'] = new Image(); imgArray['Question'].src = '/assets/question.png';
imgArray['Reference'] = new Image(); imgArray['Reference'].src = '/assets/reference.png';
imgArray['Requirement'] = new Image(); imgArray['Requirement'].src = '/assets/requirement.png';
imgArray['Resource'] = new Image(); imgArray['Resource'].src = '/assets/resource.png';
imgArray['Role'] = new Image(); imgArray['Role'].src = '/assets/role.png';
imgArray['Task'] = new Image(); imgArray['Task'].src = '/assets/task.png';
imgArray['Tool'] = new Image(); imgArray['Tool'].src = '/assets/tool.png';
imgArray['Trajectory'] = new Image(); imgArray['Trajectory'].src = '/assets/trajectory.png';
imgArray['Action'] = new Image(); imgArray['Action'].src = '/assets/action.png';
imgArray['Activity'] = new Image(); imgArray['Activity'].src = '/assets/activity.png';


// defining code to draw edges with arrows pointing in the middle of them
var renderMidArrow = function(from, to, dim, swap, canvas){ 
        var ctx = canvas.getCtx(); 
        // invert edge direction 
        if (swap) { 
              var tmp = from; 
              from = to; 
              to = tmp; 
        } 
        // vect represents a line from tip to tail of the arrow 
        var vect = new $jit.Complex(to.x - from.x, to.y - from.y); 
        // scale it 
        vect.$scale(dim / vect.norm()); 
        // compute the midpoint of the edge line 
        var midPoint = new $jit.Complex((to.x + from.x) / 2, (to.y + from.y) / 2); 
        // move midpoint by half the "length" of the arrow so the arrow is centered on the midpoint 
        midPoint.x += (vect.x / 0.7); 
        midPoint.y += (vect.y / 0.7); 
        // compute the tail intersection point with the edge line 
        var intermediatePoint = new $jit.Complex(midPoint.x - vect.x, 
midPoint.y - vect.y); 
        // vector perpendicular to vect 
        var normal = new $jit.Complex(-vect.y / 2, vect.x / 2); 
        var v1 = intermediatePoint.add(normal); 
        var v2 = intermediatePoint.$add(normal.$scale(-1)); 

        ctx.beginPath(); 
        ctx.moveTo(from.x, from.y); 
        ctx.lineTo(to.x, to.y); 
        ctx.stroke(); 
        ctx.beginPath(); 
        ctx.moveTo(v1.x, v1.y); 
        ctx.lineTo(midPoint.x, midPoint.y); 
        ctx.lineTo(v2.x, v2.y); 
        ctx.stroke(); 
}; 

var containsMidArrow = function(posFrom, posTo, pos, epsilon) { 
        return $jit.EdgeHelper.line.contains(posFrom, posTo, pos, epsilon); 
}; 

function initialize(type){
  viewMode = "graph";
  gType = type;
  
  // init custom node type 
  $jit.ForceDirected.Plot.NodeTypes.implement(nodeSettings);
  //implement an edge type  
	$jit.ForceDirected.Plot.EdgeTypes.implement(edgeSettings);
  // end
  
  // init custom node type 
  $jit.RGraph.Plot.NodeTypes.implement(nodeSettings);
  //implement an edge type  
  $jit.RGraph.Plot.EdgeTypes.implement(edgeSettings);
  // end
  
  
  if ( type == "centered") {
	  // init Rgraph
	 Mconsole = new $jit.RGraph(graphSettings(type));
  }
  else if ( type == "arranged" || type == "chaotic" ) {
	  // init ForceDirected
	 Mconsole = new $jit.ForceDirected(graphSettings(type));
  }
  else {
	 alert("You didn't specify a type!"); 
	 return false;
  }
  
  // load JSON data.
  Mconsole.loadJSON(json);
  
  // choose how to plot and animate the data onto the screen
  var chooseAnimate;
  
  if ( type == "centered") {
	  // compute positions incrementally and animate.
	  //trigger small animation  
	  Mconsole.graph.eachNode(function(n) {  
		var pos = n.getPos();  
		pos.setc(-200, -200);  
	  });  
	  Mconsole.compute('end');
	  
	  chooseAnimate = {  
		modes:['polar'],  
		duration: 2000  
	  };
  }
  else if ( type == "arranged" ) {
	  // compute positions incrementally and animate.
	  Mconsole.graph.eachNode(function(n) {  
		var pos = n.getPos();  
		pos.setc(0, 0); 
		var newPos = new $jit.Complex(); 
		newPos.x = n.data.$xloc; 
		newPos.y = n.data.$yloc; 
		n.setPos(newPos, 'end');
	  });
	  
	  chooseAnimate = {
		 modes: ['linear'],
		 transition: $jit.Trans.Quad.easeInOut,
		 duration: 2500
       };
  }
  else if ( type == "chaotic" ) {
	  // compute positions incrementally and animate.
      Mconsole.compute()
	  
	  chooseAnimate = {
         modes: ['linear'],
         transition: $jit.Trans.Elastic.easeOut,
         duration: 2500
       };
  }
  

  $(document).ready(function() {
	if ( type == "centered") {
		Mconsole.fx.animate(chooseAnimate);
	}
	else if ( type == "arranged" || type == "chaotic") {
		Mconsole.animate(chooseAnimate);
	}
  });
  // end
}