var cytoscape = require('cytoscape');
var cycola = require('cytoscape-cola');
var cola = require('cola');

cycola( cytoscape, cola ); // register extension

require(['cytoscape', 'cytoscape-cola', 'cola'], function( cytoscape, cycola, cola ){
  cycola( cytoscape, cola ); // register extension
});

var defaults = {
  animate: true, // whether to show the layout as it's running
  refresh: 1, // number of ticks per frame; higher is faster but more jerky
  maxSimulationTime: 4000, // max length in ms to run the layout
  ungrabifyWhileSimulating: false, // so you can't drag nodes during layout
  fit: true, // on every layout reposition of nodes, fit the viewport
  padding: 30, // padding around the simulation
  boundingBox: undefined, // constrain layout bounds; { x1, y1, x2, y2 } or { x1, y1, w, h }

  // layout event callbacks
  ready: function(){}, // on layoutready
  stop: function(){}, // on layoutstop

  // positioning options
  randomize: false, // use random node positions at beginning of layout
  avoidOverlap: true, // if true, prevents overlap of node bounding boxes
  handleDisconnected: true, // if true, avoids disconnected components from overlapping
  nodeSpacing: function( node ){ return 10; }, // extra spacing around nodes
  flow: undefined, // use DAG/tree flow layout if specified, e.g. { axis: 'y', minSeparation: 30 }
  alignment: undefined, // relative alignment constraints on nodes, e.g. function( node ){ return { x: 0, y: 1 } }

  // different methods of specifying edge length
  // each can be a constant numerical value or a function like `function( edge ){ return 2; }`
  edgeLength: undefined, // sets edge length directly in simulation
  edgeSymDiffLength: undefined, // symmetric diff edge length in simulation
  edgeJaccardLength: undefined, // jaccard edge length in simulation

  // iterations of cola algorithm; uses default values on undefined
  unconstrIter: undefined, // unconstrained initial layout iterations
  userConstIter: undefined, // initial layout iterations with user-specified constraints
  allConstIter: undefined, // initial layout iterations with all constraints including non-overlap

  // infinite layout options
  infinite: false // overrides all other options for a forces-all-the-time mode
};