/*

* Price Format jQuery Plugin
* By Eduardo Cuducos
* cuducos [at] gmail [dot] com
* Version: 1.1
* Release: 2009-02-10

* original char limit by Flávio Silveira <http://flaviosilveira.com>
* original keydown event attachment by Kaihua Qi
* keydown fixes by Thasmo <http://thasmo.com>

*/

(function($) {

	$.fn.priceFormat = function(options) {

		var defaults = {
			prefix: 'US$ ',
			centsSeparator: '.', 
			thousandsSeparator: ',',
			limit: false,
			centsLimit: 2
		};

		var options = $.extend(defaults, options);

		return this.each(function() {

			// pre defined options
			var obj = $(this);
			var is_number = /[0-9]/;

			// load the pluggings settings
			var prefix = options.prefix;
			var centsSeparator = options.centsSeparator;
			var thousandsSeparator = options.thousandsSeparator;
			var limit = options.limit;
			var centsLimit = options.centsLimit;

			// skip everything that isn't a number
			// and also skip the left zeroes
			function to_numbers (str) {
				var formatted = '';
				for (var i=0;i<(str.length);i++) {
					char = str.charAt(i);
					if (formatted.length==0 && char==0) char = false;
					if (char && char.match(is_number)) {
						if (limit) {
							if (formatted.length < limit) formatted = formatted+char;
						}else{
							formatted = formatted+char;
						}
					}
				}
				return formatted;
			}

			// format to fill with zeros to complete cents chars
			function fill_with_zeroes (str) {
				while (str.length<(centsLimit+1)) str = '0'+str;
				return str;
			}

			// format as price
			function price_format (str) {

				// formatting settings
				var formatted = fill_with_zeroes(to_numbers(str));
				var thousandsFormatted = '';
				var thousandsCount = 0;

				// split integer from cents
				var centsVal = formatted.substr(formatted.length-centsLimit,centsLimit);
				var integerVal = formatted.substr(0,formatted.length-centsLimit);

				// apply cents pontuation
				formatted = integerVal+centsSeparator+centsVal;

				// apply thousands pontuation
				if (thousandsSeparator) {
					for (var j=integerVal.length;j>0;j--) {
						char = integerVal.substr(j-1,1);
						thousandsCount++;
						if (thousandsCount%3==0) char = thousandsSeparator+char;
						thousandsFormatted = char+thousandsFormatted;
					}
					if (thousandsFormatted.substr(0,1)==thousandsSeparator) thousandsFormatted = thousandsFormatted.substring(1,thousandsFormatted.length);
					formatted = thousandsFormatted+centsSeparator+centsVal;
				}

				// apply the prefix
				if (prefix) formatted = prefix+formatted;

				return formatted;

			}

			// filter what user type (only numbers and functional keys)
			function key_check (e) {
		
				var code = (e.keyCode ? e.keyCode : e.which);
				var typed = String.fromCharCode(code);
				var functional = false;
				var str = obj.val();
				var newValue = price_format(str+typed);
				
				// allow keypad numbers, 0 to 9
				if(code >= 96 && code <= 105) functional = true;

				// check Backspace, Tab, Enter, and left/right arrows
				if (code ==  8) functional = true;
				if (code ==  9) functional = true;
				if (code == 13) functional = true;
				if (code == 37) functional = true;
				if (code == 39) functional = true;

				if (!functional) {
					e.preventDefault();
					e.stopPropagation();
					if (str!=newValue) obj.val(newValue);
				}

			}

			// inster formatted price as a value of an input field
			function price_it () {
				var str = obj.val();
				var price = price_format(str);
				if (str != price) obj.val(price);
			}

			// bind the actions
			$(this).bind('keydown', key_check);
			$(this).bind('keyup', price_it);
			if ($(this).val().length>0) price_it();
	
		});
	
	}; 		
	
})(jQuery);