/**
 * Apple-Style Flip Counter
 * ------------------------
 *
 * Copyright (c) 2010 Chris Nanney
 * http://cnanney.com/journal/code/apple-style-counter-revisited/
 * http://cnanney.com/journal/code/apple-style-counter/
 *
 * Licensed under MIT
 * http://www.opensource.org/licenses/mit-license.php
 */
 
var flipCounter = function(d, options){
	// Default values
	var defaults = {
		value: 0,
		inc: 1,
		pace: 1000,
		auto: true,
		debug: false //Uses console.log, so don't enable unless your browser supports it.
	};
	var k=0;
	var old_pace = 0;
	var o = options || {},
	div = d && d != '' ? "#" + d : "#counter";
	
	for (var opt in defaults) o[opt] = (opt in o) ? o[opt] : defaults[opt];

	var tFrameHeight = 17,
	bFrameHeight = 28,
	frameWidth = 23,
	digitsOld = [], digitsNew = [], subStart, subEnd, x, y, nextCount = null;
	
	this.setValue = function(n){
		if (isNumber(n)){
			x = o.value.toString();
			y = n.toString();
			o.value = n;
			digitCheck(x,y);
		}
		return this;
	};
	
	
	/**
	 * Increments counter by one animation based on set 'inc' value.
	 */
	this.step = function(){
		if (! o.auto) doCount();
		return this;
	};
	
	//---------------------------------------------------------------------------//
	
	function doCount(){
		if(k<10){
			o.inc=counter_random_increment*k;
			k++;		
		}else if(k==10){
			o.pace=old_pace;
			o.inc=1;
			k++;
		}
			
		x = o.value.toString();
		o.value += o.inc;
		y = o.value.toString();
		digitCheck(x,y);
		if (o.auto === true) nextCount = setTimeout(doCount, o.pace);
	}	
	
	
	function digitCheck(x,y){
		digitsOld = splitToArray(x);
		digitsNew = splitToArray(y);
		if (y.length > x.length){
			var diff = y.length - x.length;
			while (diff > 0){
				var adder = 1;
				addDigit(y.length - diff + 1, digitsNew[y.length - diff]);
				adder++;
				diff--;
			}
		}
		if (y.length < x.length){
			var diff = x.length - y.length;
			while (diff > 0){
				var adder = 1;
				removeDigit(x.length - diff);
				diff--;
			}
		}
		for (var i = 0; i < digitsOld.length; i++){
			if (digitsNew[i] != digitsOld[i]){
				animateDigit(i, digitsOld[i], digitsNew[i]);
			}
		}
	}
	
	function animateDigit(n, oldDigit, newDigit){
		var speed, step = 0, w,
		bp = [
			'-' + frameWidth + 'px -' + (oldDigit * tFrameHeight) + 'px',
			(frameWidth * -2) + 'px -' + (oldDigit * tFrameHeight) + 'px',
			'0 -' + (newDigit * tFrameHeight) + 'px',
			'-' + frameWidth + 'px -' + (oldDigit * bFrameHeight) + 'px',
			(frameWidth * -2) + 'px -' + (newDigit * bFrameHeight) + 'px',
			(frameWidth * -3) + 'px -' + (newDigit * bFrameHeight) + 'px',
			'0 -' + (newDigit * bFrameHeight) + 'px'
		];

		if (o.auto === true && o.pace <= 300){
			switch (n){
				case 0:
					speed = o.pace/6;
					break;
				case 1:
					speed = o.pace/5;
					break;
				case 2:
					speed = o.pace/4;
					break;
				case 3:
					speed = o.pace/3;
					break;
				default:
					speed = o.pace/2;
					break;
			}
		}
		else{
			speed = 80;
		}
		// Cap on slowest animation can go
		speed = (speed > 80) ? 80 : speed;
		
		function animate(){
			if (step < 7){
				w = step < 3 ? 't' : 'b';
				jQuery(div + " #d" + n + " li." + w).css("background-position", bp[step]);
				step++;
				if (step != 3) setTimeout(animate, speed);
				else animate();
			}
		}
		
		animate();
	}
	
	// Creates array of digits for easier manipulation
	function splitToArray(input){
		var digits = new Array();
		for (var i = 0; i < input.length; i++){
			subStart = input.length - (i + 1);
			subEnd = input.length - i;
			digits[i] = input.substring(subStart, subEnd);
		}
		return digits;
	}

	// Adds new digit
	function addDigit(len, digit){
		var li = Number(len) - 1;
		if (li % 3 == 0) jQuery(div).prepend('<ul class="cd"><li class="s"></li></ul>');
		jQuery(div).prepend('<ul class="cd" id="d' + li + '"><li class="t"></li><li class="b"></li></ul>');
		jQuery(div + " #d" + li + " li.t").css({'background-position': '0 -' + (digit * tFrameHeight) + 'px'});
		jQuery(div + " #d" + li + " li.b").css({'background-position': '0 -' + (digit * bFrameHeight) + 'px'});
	}
	
	// Removes digit
	function removeDigit(id){
		jQuery(div + " #d" + id).remove();
		// Check for leading comma
		var first = jQuery(div + " li").first();
		if (first.hasClass("s")) first.parent("ul").remove();
	}

	function isNumber(n) {
		return !isNaN(parseFloat(n)) && isFinite(n);
	}
	// Sets the correct digits on load
	function initialDigitCheck(initial){
		if(k==0){							
				old_pace=o.pace
				o.pace=100;
				o.inc=counter_random_increment;				
			}	
		// Creates the right number of digits
		var count = initial.toString().length;
		var bit = 1;
		for (var i = 0; i < count; i++){
			jQuery(div).prepend('<ul class="cd" id="d' + i + '"><li class="t"></li><li class="b"></li></ul>');
			if (bit != (count) && bit % 3 == 0) jQuery(div).prepend('<ul class="cd"><li class="s"></li></ul>');
			bit++;
		}
		// Sets them to the right number
		var digits = splitToArray(initial.toString());
		for (var i = 0; i < count; i++){
			jQuery(div + " #d" + i + " li.t").css({'background-position': '0 -' + (digits[i] * tFrameHeight) + 'px'});
			jQuery(div + " #d" + i + " li.b").css({'background-position': '0 -' + (digits[i] * bFrameHeight) + 'px'});
		}
		// Do first animation
		if (o.auto === true) nextCount = setTimeout(doCount, o.pace);
		//this.setValue(200);
	}	
	
	// Start it up
	initialDigitCheck(o.value);
};