/*  Snowfall jquery plugin 
	Version 1.3.1 Nov 25th 2010
	Updated script that caused flakes not to show at all if plugin was initialized with no options, also added the fixes that Han Bongers suggested 
	
	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;
				this.y  = _y;
				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, '-moz-border-radius' : '3px', 'height' : this.size, 'background' : options.flakeColor, 'position' : 'absolute', 'top' : this.y, 'left' : this.x, 'fontSize' : 0, 'zIndex' : options.flakeIndex});
				
				if($(element).get(0).tagName === $(document).get(0).tagName){
					$('body').append(flakeMarkup);
					element = $('body');
				}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 + 'px';
					this.element.style.left = this.x + '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);
			}
			
			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" || options == undefined){		
				 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);