'use strict';



///////////////////////////////////////////////////////////////////////////
/////////////////////////// @eesur's code /////////////////////////////////
///////////////////////////////////////////////////////////////////////////	

var w = window.innerWidth;
var h = window.innerHeight;

// store generated data
var data = [];

var svg = d3.select('body').append('svg').attr('width', w).attr('height', h);

///////////////////////////////////////////////////////////////////////////
///////////////// Gooey filter (from Nadieh Bremmer) //////////////////////
///////////////////////////////////////////////////////////////////////////	

//SVG filter for the gooey effect
//Code taken from http://tympanus.net/codrops/2015/03/10/creative-gooey-effects/
var defs = svg.append("defs");
var filter = defs.append("filter").attr("id","gooeyCodeFilter");
filter.append("feGaussianBlur")
  .attr("in","SourceGraphic")
  .attr("stdDeviation","10")
  //to fix safari: http://stackoverflow.com/questions/24295043/svg-gaussian-blur-in-safari-unexpectedly-lightens-image
  .attr("color-interpolation-filters","sRGB") 
  .attr("result","blur");
filter.append("feColorMatrix")
  .attr("in","blur")
  .attr("mode","matrix")
  .attr("values","1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 19 -9")
  .attr("result","gooey");

//Create a wrapper for the circles that has the Gooey effect applied to it
var circleWrapper = svg.append("g")
  .style("filter", "url(#gooeyCodeFilter)");

///////////////////////////////////////////////////////////////////////////	

// var circle = svg.selectAll('circle');		//ORIG
var circle = circleWrapper.selectAll('circle');

var force = d3.layout.force()
	.size([w, h])
	.linkStrength(0.1)
  .friction(0.7)
	.on('tick', function () {
    circle.attr('cx', function (d) {
        return d.x;
    }).attr('cy', function (d) {
        return d.y;
    });
});

var render = function render(data) {
    circle = circle.data(data, function (d) {
        return d.id;
    });

    circle.enter().append('circle').attr('fill', function (d) {
        return d.color;
    }).attr('r', Math.floor(Math.random() * 50)).call(force.drag);

    circle.exit().transition().attr('r', 0).remove();

    force.nodes(data).start();
};

// generate some data
var updateCounter = 0;
var maxUpdates = 60;    // only add blobs this number of times, then stop.
var updateInterval;
function update() {
    
    var n = 0;
    var c = ['#FF95FF', '#FCFCFC', '#FFEB3A', '#FFC101', '#14F0EE'];

    return function () {
        
        // Stop adding blobs if reach max.
        updateCounter++;
        //console.log("updateCounter:", updateCounter);
        if (updateCounter >= maxUpdates) {
            console.warn("updateCounter >= "+ maxUpdates +" >>> stopping update cycle.");
            window.clearInterval(updateInterval);
        }
        
	    data.push({
            id: n,
            color: c[n % 5]
        });
        //console.log(data);
        render(data);
        n++;
        
    };
    
}

// update every second
// note: calling as update()(); (higher order function)
updateInterval = window.setInterval(update(), 1000);