/*
* jOdometer (1.0) // 2008.03.17 // <http://plugins.jquery.com/project/jOdometer>
* 
* REQUIRES jQuery 1.2.3+ <http://jquery.com/>
* 
* Copyright (c) 2008 TrafficBroker <http://www.trafficbroker.co.uk>
* Licensed under GPL and MIT licenses
* 
* jOdometer is a counter that works like an odometer: moving the numbers up like a wheel 
*
* Usually we will need a "position: relative" and an "overflow: hidden" in the container element.
*
* Sample Configuration:
* $('.counter').jOdometer({increment: 3.17, counterStart:'0087.15', counterEnd:'0159.50', numbersImage: '/images/numbers.png', spaceNumbers: 2, offsetRight:5});
* 
* Config Options:
* counterStart: Number we are starting with. To get a specific number of digits/decimals it have to be a string (e.g. '0005.50') // Default: '0000.00'
* counterEnd: The counter stop when reach this number. If it is the same as counterStart the odometer is static. False to don't stop never. // Default: false
* delayTime: Delay between each number change // Default: 1000
* increment: Number increment after each delayTime // Default: 0.01
* speed: Speed for the change number animation // Default: 500
* easing: Easing for the change number animation. Other than 'swing' or 'linear' must be provided by plugin // Default: 'swing'
* numbersImage: Image used for the numbers. You can use .psd provided // Default: '/images/numbers.png'
* heightNumber: The height that each number needs // Default: 31
* widthNumber: Width of the numbers' image // Default: 14
* offsetRight: Distance to the right // Default: 0
* spaceNumbers: Separation between the numbers' columns // Default: 0
* widthDot: Decimal dot's special width // Default: 10
* 
* We can override the defaults with:
* $.fn.jOdometer.defaults.spaceNumbers = 1;
* 
* @param  settings  An object with configuration options
* @author    Jesus Carrera <jesus.carrera@trafficbroker.co.uk>
*/
(function($) {
$.fn.jOdometer = function(settings) {
	// override default configuration
	settings = $.extend({}, $.fn.jOdometer.defaults, settings);
	// for each counter
  return this.each(function(){
		
		var scope = $(this); // store the actual counter
		
		var zeroSet=-settings.heightNumber; // position of the first 0
		var counter = parseFloat(settings.counterStart); // initialize counter with the start number
		// to store the digits of the number
		var integersArray = [];
		var decimalsArray = [];
		var digits = String(settings.counterStart).split('.'); // separate integers and decimals
		var numberOfDecimals = 0;
		var widthDot = 0;
		// if has decimals
		if (digits[1]){
			// create a column for each decimal digit with the image in the position of the correspondent number
			var j=0;
			for (var i=digits[1].length-1;i>-1;i--){
				decimalsArray[i] = digits[1].charAt(i);
				$(this).append('<img style="position:absolute; right:'+( j*settings.widthNumber + settings.offsetRight + j*settings.spaceNumbers )+'px; top:'+ ((parseInt(decimalsArray[i]) *settings.heightNumber*-1)+zeroSet)+'px;" class="jodometer_decimal_'+i+'" src="'+settings.numbersImage+'" alt="Decimal '+(i+1)+'" />');
				j++;
			}
			// add the dot
			$(this).append('<div style="position:absolute; width:'+settings.widthDot+'px; height:'+settings.heightNumber+'px; background:url('+settings.numbersImage+') no-repeat center bottom; right:'+( digits[1].length*settings.widthNumber + settings.offsetRight + digits[1].length*settings.spaceNumbers )+'px;" class="jodometer_dot"></div>');
			numberOfDecimals = digits[1].length;
			widthDot = settings.widthDot;
		}
		// create a column for each integer digit with the image in the position of the correspondent number
		var widthDot2=0;
		var integers = digits[0];
		var j=integers.length-1;
		for (var i=0;i<integers.length;i++){
			integersArray[i] = integers.charAt(j);
			$(this).append('<img style="position:absolute; right:'+ ( i*settings.widthNumber + numberOfDecimals*settings.widthNumber + widthDot + settings.offsetRight + numberOfDecimals*settings.spaceNumbers + i*settings.spaceNumbers + settings.spaceNumbers + widthDot2) +'px; top:'+ ((parseInt(integersArray[i]) *settings.heightNumber*-1)+zeroSet)+'px;" class="jodometer_integer_'+i+'" src="'+settings.numbersImage+'" alt="Integer '+(i+1)+'" />');
			j--;
			
			// add the dot for the millions separation
			if (i == 2)
			{
				$(this).append('<div style="position:absolute; width:'+settings.widthDot+'px; height:'+settings.heightNumber+'px; background:url('+settings.numbersImage+') no-repeat center bottom; right:'+( 3*settings.widthNumber + numberOfDecimals*settings.widthNumber + widthDot + settings.offsetRight + 6*settings.spaceNumbers )+'px;" class="jodometer_dot"></div>');
				numberOfDecimals = 3;
				widthDot2 = settings.widthDot;
			}
		}
		// add the interval
		if(parseFloat(settings.counterStart) != settings.counterEnd || (settings.counterEnd.toString() == 'false' && parseFloat(settings.counterStart) == 0) ){
			var counterInterval = setInterval(advanceCounter,  settings.delayTime);
		}
		// set the number increments
		function advanceCounter() {
			setNumbers(counter);
			counter = counter + settings.increment;	// increment the number	
			// if we reach the end clear the interval and use the ending number
			if(settings.counterEnd != false && counter >= settings.counterEnd){
				clearInterval(counterInterval);
				setNumbers(settings.counterEnd);
			}
		}
		// to move the colums from one number position to another
		function setNumbers(counter){
			digits = String(counter).split('.'); // check decimals
			// if we where using decimals
			if (decimalsArray.length > 0){
				// for each decimal digit, update the old digit position to the new
				for (i=0;i<decimalsArray.length;i++){
					oldDigit = decimalsArray[i];
					// the new numer could have not decimal part, but we need it anyway
					if (digits[1]){
						decimalsArray[i] = digits[1].charAt(i);
					}
					if (decimalsArray[i] == ''){
						decimalsArray[i] = '0';
					}
					updatePosition($('.jodometer_decimal_'+i, scope), parseInt(decimalsArray[i]), parseInt(oldDigit));
				}
			}

			integers = digits[0];
			j=integers.length-1;
			// for each integer digit, update the old digit position to the new
			for (i=0;i<integersArray.length;i++){
				oldDigit = integersArray[i];
				integersArray[i] = integers.charAt(j);
				if (integersArray[i] == ''){
					integersArray[i] = '0';
				}
				//alert($(this));
				updatePosition($('.jodometer_integer_'+i, scope), parseInt(integersArray[i]), parseInt(oldDigit));
				j--;
			}
		}
		// changes the column position from one number to another
		function updatePosition(col, newDigit, oldDigit){
			if(newDigit != oldDigit){
				col.stop();
				// if the number is 0 use the bottom 0 in the image, and change intantly to the top 0
				if (newDigit == 0){
					col.animate({top: (10*settings.heightNumber*-1)+zeroSet}, settings.speed, settings.easing).animate({top: zeroSet},1, 'linear');
				}else{
					// if the new number is lower than the old, we have to go to the bottom 0 and start from the top 0, with the apropiate speed, to don't note the jump
					if (newDigit < oldDigit){
						col.animate({top: (10*settings.heightNumber*-1)+zeroSet}, settings.speed*((10-oldDigit)/10), 'linear').animate({top: zeroSet},1, 'linear').animate({top: (newDigit*settings.heightNumber*-1)+zeroSet}, settings.speed*oldDigit/10, settings.easing);
					}else{
						col.animate({top: (newDigit*settings.heightNumber*-1)+zeroSet}, settings.speed, settings.easing);
					}
				}
			}
		}
	});
};
// default settings
$.fn.jOdometer.defaults = {
	counterStart: '0000.00',
	counterEnd: false,
	delayTime: 1000,
	increment: 0.01,
	speed: 500,
	easing: 'swing',
	numbersImage: '/images/jodometer-numbers.png',
	heightNumber: 31,
	widthNumber: 14,
	offsetRight: 0,
	spaceNumbers: 0,
	widthDot: 10
};
})(jQuery);