/*  Snowfall jquery plugin 

	version 1.3, Apr 29 2010

	Developed by Jason Brown for any bugs or questions email me at loktar69@hotmail

	info on the plugin is located on Somethinghitme.com

	

	values for snow options are

	

	flakeCount,

	flakeColor,

	flakeIndex,

	minSize,

	maxSize,

	minSpeed,

	maxSpeed

	

	Example Usage :

	$(document).snowfall({flakeCount : 100, maxSpeed : 10});

	

	-or-

	

	$('#element').snowfall({flakeCount : 800, maxSpeed : 5, maxSize : 5});

	

	-or with defaults-

	

	$(document).snowfall();

	

	- To clear -

	$('#element').snowfall('clear');

*/



(function($){

	$.snowfall = function(element, options){

		var	defaults = {

				flakeCount : 35,

				flakeColor : '#ffffff',

				flakeIndex: 999999,

				minSize : 1,

				maxSize : 3,

				minSpeed : 2,

				maxSpeed : 3

			},

			options = $.extend(defaults, options),

			random = function random(min, max){

				return Math.round(min + Math.random()*(max-min)); 

			};

			

			$(element).data("snowfall", this);			

			

			// Snow flake object

			function Flake(_x, _y, _size, _speed, _id)

			{

				// Flake properties

				this.id = _id; 

				this.x  = _x-40;

				this.y  = _y-40;

				this.size = _size;

				this.speed = _speed;

				this.step = 0,

				this.stepSize = random(1,10) / 100;

				

				var flakeMarkup = $(document.createElement("div")).attr({'class': 'snowfall-flakes', 'id' : 'flake-' + this.id}).css({'width' : this.size, 'height' : this.size, 'color' : options.flakeColor, 'position' : 'absolute', 'top' : this.y, 'left' : this.x, 'font-size' : this.size, 'zIndex' : options.flakeIndex});

				

				if($(element).get(0).tagName === $(document).get(0).tagName){

					$('body').append(flakeMarkup);

				}else{

					$(element).append(flakeMarkup);

				}

				

				this.element = document.getElementById('flake-' + this.id);

				

				// Update function, used to update the snow flakes, and checks current snowflake against bounds

				this.update = function(){

					this.y += this.speed;

					

					if(this.y > (elHeight) - 6){

						this.reset();

					}

					

					this.element.style.top = (this.y-25) + 'px';

					this.element.style.left = (this.x-50) + 'px';

					

					this.step += this.stepSize;

					this.x += Math.cos(this.step);

					

					if(this.x > (elWidth) - 6 || this.x < 6){

						this.reset();

					}

				}

				

				// Resets the snowflake once it reaches one of the bounds set

				this.reset = function(){

					this.y = 0;

					this.x = random(0, elWidth);

					this.stepSize = random(1,10) / 100;

					this.size = random((options.minSize * 100), (options.maxSize * 100)) / 100;

					this.speed = random(options.minSpeed, options.maxSpeed);

				}

			}

		

			// Private vars

			var flakes = [],

				flakeId = 0,

				i = 0,

				elHeight = $(element).height(),

				elWidth = $(element).width();

			

			// Bind the window resize event so we can get the innerHeight again

			$(window).bind("resize", function(){  

				elHeight = $(element).height();

				elWidth = $(element).width();

			}); 

			



			// initialize the flakes

			for(i = 0; i < options.flakeCount; i+=1){

				flakeId = flakes.length;

				flakes.push(new Flake(random(0,elWidth), random(0, elHeight), random((options.minSize * 100), (options.maxSize * 100)) / 100, random(options.minSpeed, options.maxSpeed), flakeId));

			}

		

			// this controls flow of the updating snow

			function snow(){

				for( i = 0; i < flakes.length; i += 1){

					flakes[i].update();

				}

				

				setTimeout(function(){snow()}, 30);

			}

			$(".snowfall-flakes").html("*");	

			snow();

		

		// Public Methods

		

		// clears the snowflakes

		this.clear = function(){

						$(element).children('.snowfall-flakes').remove();

						flakes = [];

					};

	};

	

	// Initialize the options and the plugin

	$.fn.snowfall = function(options){

		if(typeof(options) == "object"){		

				 return this.each(function(i){

					(new $.snowfall(this, options)); 

				});	

		}else if (typeof(options) == "string") {

			return this.each(function(i){

				var snow = $(this).data('snowfall');

				if(snow){

					snow.clear();

				}

			});

		}

	};

})(jQuery);