var LGraphObject = require('./LGraphObject');
var Integer = require('./util/Integer');
var RectangleD = require('./util/RectangleD');
var LayoutConstants = require('./LayoutConstants');
var RandomSeed = require('./util/RandomSeed');
var PointD = require('./util/PointD');

function LNode(gm, loc, size, vNode) {
  //Alternative constructor 1 : LNode(LGraphManager gm, Point loc, Dimension size, Object vNode)
  if (size == null && vNode == null) {
    vNode = loc;
  }

  LGraphObject.call(this, vNode);

  //Alternative constructor 2 : LNode(Layout layout, Object vNode)
  if (gm.graphManager != null)
    gm = gm.graphManager;

  this.estimatedSize = Integer.MIN_VALUE;
  this.inclusionTreeDepth = Integer.MAX_VALUE;
  this.vGraphObject = vNode;
  this.edges = [];
  this.graphManager = gm;

  if (size != null && loc != null)
    this.rect = new RectangleD(loc.x, loc.y, size.width, size.height);
  else
    this.rect = new RectangleD();
}

LNode.prototype = Object.create(LGraphObject.prototype);
for (var prop in LGraphObject) {
  LNode[prop] = LGraphObject[prop];
}

LNode.prototype.getEdges = function ()
{
  return this.edges;
};

LNode.prototype.getChild = function ()
{
  return this.child;
};

LNode.prototype.getOwner = function ()
{
//  if (this.owner != null) {
//    if (!(this.owner == null || this.owner.getNodes().indexOf(this) > -1)) {
//      throw "assert failed";
//    }
//  }

  return this.owner;
};

LNode.prototype.getWidth = function ()
{
  return this.rect.width;
};

LNode.prototype.setWidth = function (width)
{
  this.rect.width = width;
};

LNode.prototype.getHeight = function ()
{
  return this.rect.height;
};

LNode.prototype.setHeight = function (height)
{
  this.rect.height = height;
};

LNode.prototype.getCenterX = function ()
{
  return this.rect.x + this.rect.width / 2;
};

LNode.prototype.getCenterY = function ()
{
  return this.rect.y + this.rect.height / 2;
};

LNode.prototype.getCenter = function ()
{
  return new PointD(this.rect.x + this.rect.width / 2,
          this.rect.y + this.rect.height / 2);
};

LNode.prototype.getLocation = function ()
{
  return new PointD(this.rect.x, this.rect.y);
};

LNode.prototype.getRect = function ()
{
  return this.rect;
};

LNode.prototype.getDiagonal = function ()
{
  return Math.sqrt(this.rect.width * this.rect.width +
          this.rect.height * this.rect.height);
};

/**
 * This method returns half the diagonal length of this node.
 */
LNode.prototype.getHalfTheDiagonal = function () {
  return Math.sqrt(this.rect.height * this.rect.height +
      this.rect.width * this.rect.width) / 2;
};

LNode.prototype.setRect = function (upperLeft, dimension)
{
  this.rect.x = upperLeft.x;
  this.rect.y = upperLeft.y;
  this.rect.width = dimension.width;
  this.rect.height = dimension.height;
};

LNode.prototype.setCenter = function (cx, cy)
{
  this.rect.x = cx - this.rect.width / 2;
  this.rect.y = cy - this.rect.height / 2;
};

LNode.prototype.setLocation = function (x, y)
{
  this.rect.x = x;
  this.rect.y = y;
};

LNode.prototype.moveBy = function (dx, dy)
{
  this.rect.x += dx;
  this.rect.y += dy;
};

LNode.prototype.getEdgeListToNode = function (to)
{
  var edgeList = [];
  var edge;
  var self = this;

  self.edges.forEach(function(edge) {
    
    if (edge.target == to)
    {
      if (edge.source != self)
        throw "Incorrect edge source!";

      edgeList.push(edge);
    }
  });

  return edgeList;
};

LNode.prototype.getEdgesBetween = function (other)
{
  var edgeList = [];
  var edge;
  
  var self = this;
  self.edges.forEach(function(edge) {

    if (!(edge.source == self || edge.target == self))
      throw "Incorrect edge source and/or target";

    if ((edge.target == other) || (edge.source == other))
    {
      edgeList.push(edge);
    }
  });

  return edgeList;
};

LNode.prototype.getNeighborsList = function ()
{
  var neighbors = new Set();
  
  var self = this;
  self.edges.forEach(function(edge) {

    if (edge.source == self)
    {
      neighbors.add(edge.target);
    }
    else
    {
      if (edge.target != self) {
        throw "Incorrect incidency!";
      }
    
      neighbors.add(edge.source);
    }
  });

  return neighbors;
};

LNode.prototype.withChildren = function ()
{
  var withNeighborsList = new Set();
  var childNode;
  var children;

  withNeighborsList.add(this);

  if (this.child != null)
  {
    var nodes = this.child.getNodes();
    for (var i = 0; i < nodes.length; i++)
    {
      childNode = nodes[i];
      children = childNode.withChildren();
      children.forEach(function(node) {
        withNeighborsList.add(node);
      });
    }
  }

  return withNeighborsList;
};

LNode.prototype.getNoOfChildren = function ()
{
  var noOfChildren = 0;
  var childNode;

  if(this.child == null){
    noOfChildren = 1;
  }
  else
  {
    var nodes = this.child.getNodes();
    for (var i = 0; i < nodes.length; i++)
    {
      childNode = nodes[i];

      noOfChildren += childNode.getNoOfChildren();
    }
  }
  
  if(noOfChildren == 0){
    noOfChildren = 1;
  }
  return noOfChildren;
};

LNode.prototype.getEstimatedSize = function () {
  if (this.estimatedSize == Integer.MIN_VALUE) {
    throw "assert failed";
  }
  return this.estimatedSize;
};

LNode.prototype.calcEstimatedSize = function () {
  if (this.child == null)
  {
    return this.estimatedSize = (this.rect.width + this.rect.height) / 2;
  }
  else
  {
    this.estimatedSize = this.child.calcEstimatedSize();
    this.rect.width = this.estimatedSize;
    this.rect.height = this.estimatedSize;

    return this.estimatedSize;
  }
};

LNode.prototype.scatter = function () {
  var randomCenterX;
  var randomCenterY;

  var minX = -LayoutConstants.INITIAL_WORLD_BOUNDARY;
  var maxX = LayoutConstants.INITIAL_WORLD_BOUNDARY;
  randomCenterX = LayoutConstants.WORLD_CENTER_X +
          (RandomSeed.nextDouble() * (maxX - minX)) + minX;

  var minY = -LayoutConstants.INITIAL_WORLD_BOUNDARY;
  var maxY = LayoutConstants.INITIAL_WORLD_BOUNDARY;
  randomCenterY = LayoutConstants.WORLD_CENTER_Y +
          (RandomSeed.nextDouble() * (maxY - minY)) + minY;

  this.rect.x = randomCenterX;
  this.rect.y = randomCenterY
};

LNode.prototype.updateBounds = function () {
  if (this.getChild() == null) {
    throw "assert failed";
  }
  if (this.getChild().getNodes().length != 0)
  {
    // wrap the children nodes by re-arranging the boundaries
    var childGraph = this.getChild();
    childGraph.updateBounds(true);

    this.rect.x = childGraph.getLeft();
    this.rect.y = childGraph.getTop();

    this.setWidth(childGraph.getRight() - childGraph.getLeft());
    this.setHeight(childGraph.getBottom() - childGraph.getTop());
    
    // Update compound bounds considering its label properties    
    if(LayoutConstants.NODE_DIMENSIONS_INCLUDE_LABELS){
        
      var width = childGraph.getRight() - childGraph.getLeft();
      var height = childGraph.getBottom() - childGraph.getTop();

      if(this.labelWidth > width){
        this.rect.x -= (this.labelWidth - width) / 2;
        this.setWidth(this.labelWidth);
      }

      if(this.labelHeight > height){
        if(this.labelPos == "center"){
          this.rect.y -= (this.labelHeight - height) / 2;
        }
        else if(this.labelPos == "top"){
          this.rect.y -= (this.labelHeight - height); 
        }
        this.setHeight(this.labelHeight);
      }
    }
  }
};

LNode.prototype.getInclusionTreeDepth = function ()
{
  if (this.inclusionTreeDepth == Integer.MAX_VALUE) {
    throw "assert failed";
  }
  return this.inclusionTreeDepth;
};

LNode.prototype.transform = function (trans)
{
  var left = this.rect.x;

  if (left > LayoutConstants.WORLD_BOUNDARY)
  {
    left = LayoutConstants.WORLD_BOUNDARY;
  }
  else if (left < -LayoutConstants.WORLD_BOUNDARY)
  {
    left = -LayoutConstants.WORLD_BOUNDARY;
  }

  var top = this.rect.y;

  if (top > LayoutConstants.WORLD_BOUNDARY)
  {
    top = LayoutConstants.WORLD_BOUNDARY;
  }
  else if (top < -LayoutConstants.WORLD_BOUNDARY)
  {
    top = -LayoutConstants.WORLD_BOUNDARY;
  }

  var leftTop = new PointD(left, top);
  var vLeftTop = trans.inverseTransformPoint(leftTop);

  this.setLocation(vLeftTop.x, vLeftTop.y);
};

LNode.prototype.getLeft = function ()
{
  return this.rect.x;
};

LNode.prototype.getRight = function ()
{
  return this.rect.x + this.rect.width;
};

LNode.prototype.getTop = function ()
{
  return this.rect.y;
};

LNode.prototype.getBottom = function ()
{
  return this.rect.y + this.rect.height;
};

LNode.prototype.getParent = function ()
{
  if (this.owner == null)
  {
    return null;
  }

  return this.owner.getParent();
};

module.exports = LNode;